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Journal articles on the topic 'Anti-vibration devices'
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1
Feng, Yanting, Wenbin Li, Yadong Lv, and Zhixiao Liu. "Design and Experimental Study of a New Anti‐vibration Hammer." ce/papers 8, no. 2 (2025): 1056–64. https://doi.org/10.1002/cepa.3195.
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AbstractA long time of wind vibration will cause fatigue damage to transmission lines. In order to reduce the wind vibration strength of the transmission line, it is unusually necessary to install anti‐vibration devices such as anti‐vibration hammers and damping on the transmission line. One of the most important and effective ways is the anti‐vibration hammer, which plays a significant role in damping vibration and is widely used in the field of wind vibration control of transmission lines. To solve the problems of fatigue damage and the poor performance of the vibration reduction at low frequencies, an anti‐vibration hammer with a hinge structure is designed in this paper. The vibration of the wire is transmitted to the anti‐vibration hammer through the hinge structure, and the effect of transverse displacement of the anti‐vibration hammer is amplified, which can absorb more energy. The vibration‐damping performance of the transmission line experimental setup was carried out in the lab environment. The results demonstrate that the amplitude response of the transmission line is significantly reduced after the installation of the anti‐vibration hammer, and the vibration damping effect of the designed anti‐vibration hammer with hinged structure is better than that of the traditional FD3 anti‐vibration hammer in the low‐frequency range of 19∼30 Hz.
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Zhao, Bin, Yongfeng Cheng, Jingchao Wang, Bin Liu, and Yushu Chen. "Study on the Effect of Anti-galloping Device with Cubic Stiffness and Particle Damping." Journal of Physics: Conference Series 2592, no. 1 (2023): 012001. http://dx.doi.org/10.1088/1742-6596/2592/1/012001.
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Abstract The galloping of iced conductors is a common disaster of overhead conductors. Most traditional anti-galloping devices lack a nonlinear dynamic vibration absorber; hence, they have a limited anti-galloping effect. In this study, we designed, optimized, and tested an electric power fitting and an anti-galloping device with cubic stiffness and particle damping for ultra-high-voltage (UHV) transmission lines. We built a nonlinear dynamic model of the coupling galloping system comprising split conductors and anti-galloping devices. The harmonic balance method obtained the steady-state analytical solutions and corresponding averaged equations. The test spans in the laboratory were used to design the test program and equipment. We verified the accuracy of the nonlinear dynamic model and the harvesting effect of the anti-galloping device with cubic stiffness and particle damping. The theoretical and experimental results were highly consistent, and in the range of (0, 2] Hz, the anti-galloping device reduced the galloping amplitude. Therefore, cubic stiffness and particle damping can effectively improve the anti-galloping ability of UHV transmission lines, prolonging their service period.
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Taranenko, P. A., Yu O. Pronina, I. Ya Berezin, and A. A. Abyzov. "BENCHMARK TRIALS OF ANTI-VIBRATION DEVICES UNDER RANDOM EXTERNAL LOADING." Bulletin of the South Ural State University series "Mathematics. Mechanics. Physics" 10, no. 4 (2018): 58–64. http://dx.doi.org/10.14529/mmph180407.
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Li, Guangxun, Qing Liu, Xingyuan Qin, et al. "Study on the Control Effect of Viscoelastic Anti-Dancing Device on Long-span High-voltage Transmission Line under Icing Conditions." Architecture Engineering and Science 5, no. 4 (2025): 232. https://doi.org/10.32629/aes.v5i4.3213.
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This study investigates the control effect of a viscoelastic anti-dancing device on long-span high-voltage transmission lines subjected to icing conditions. The growing frequency of icing on transmission lines presents significant risks, including structural damage and service interruptions. The viscoelastic anti-dancing device aims to mitigate the negative impacts of dynamic oscillations induced by wind and ice accumulation. Through a combination of field tests and numerical simulations, the device's performance is assessed in terms of its ability to reduce vibration amplitudes and enhance the stability of transmission lines. Results demonstrate a marked improvement in oscillation control, leading to increased reliability and safety of high-voltage power transmission during adverse weather conditions. This research offers valuable insights into the use of viscoelastic materials for designing protective devices for transmission lines.
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Chuanasa, Jakkrapun, and Szathys Songschon. "Essential tremor suppression by a novel self-balancing device." Prosthetics and Orthotics International 39, no. 3 (2014): 219–25. http://dx.doi.org/10.1177/0309364614525185.
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Background: There are many associated devices using impedance method. However, they cannot completely suppress tremor. Other methods using active vibration control have been a challenging problem for industrial and academic researchers. Potential applications of the latter for tremor patients are still not realized. Objectives: This article presents a novel method for suppressing human lower arm tremor in essential tremor by using a self-balancing technique. Study design: In this article, a rotating unbalanced mass actuator was used to imitate an arm tremor with the same frequency range obtained from clinical sources. A novel counter-balance device was designed to attach the fictitious arm. The tremor reduction is expecting quantitatively. Methods: A Proportional–Integral–Derivative controller and an algorithm programmed in LabVIEW are proposed to control a rotating unbalanced mass actuator, anti-shaker, in order to counter the tremor. The self-balancing system for the new approach was obtained when both amplitudes and frequencies of anti-shaker and tremor are the same. Results: The results show that this method can reduce vibration of tremor in the order of 0.001 rad/s2. Conclusion: This method can suppress the vibration and can also auto-tune to counter the tremor in a range of 4–12 Hz bandwidth. Clinical relevance The therapy of arm tremor was associated with using counter-devices to palliate the vibration magnitude. Conventional methods such as physical surgery and drugs cannot completely eliminate tremor. The novel counter-device is an alternative technique with promising application for clinical uses for tremor patients without involving harmful surgery.
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Ma, Rujian, Haiting Zhang, and Dong Zhao. "Study on the anti-vibration devices for a model jacket platform." Marine Structures 23, no. 4 (2010): 434–43. http://dx.doi.org/10.1016/j.marstruc.2010.10.002.
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Zhao, Bin, Jiajun Si, Zhao Zhang, and Jingshan Han. "Experimental analysis of zero-natural-frequency damper for transmission line large cross project based on NES." Journal of Physics: Conference Series 2076, no. 1 (2021): 012109. http://dx.doi.org/10.1088/1742-6596/2076/1/012109.
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Abstract The operation experience of transmission line large cross project shows that the traditional anti-aeolian-vibration devices had poor adaptability to complex terrain and micro meteorological conditions, and they were difficult to meet the application requirements of super large cross project at this stage. A zero-natural-frequency damper was designed by introducing nonlinear energy sink in this paper, and the solid prototypes were processed. According to the actual design parameters of conductor using in a large cross project, the anti-vibration effect was tested by using the indoor simulation test span. The test results showed that the anti-vibration effect of the scheme based on the zero-natural-frequency damper could meet the needs of practical engineering. The installation of this damper could improve conductors’ and fittings’ adaptability to complex terrain and enhance the wind and anti-vibration ability of transmission line.
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Breńkacz, Łukasz, Paweł Bagiński, and Jarosław K. Korbicz. "Vibration damping of the anti-vibration platform intended for use in combination with audio/music devices." Journal of Vibroengineering 22, no. 3 (2020): 578–93. http://dx.doi.org/10.21595/jve.2019.20846.
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Carleo, Francesca, Jan Plagge, Roly Whear, James Busfield, and Manfred Klüppel. "Modeling the Full Time-Dependent Phenomenology of Filled Rubber for Use in Anti-Vibration Design." Polymers 12, no. 4 (2020): 841. http://dx.doi.org/10.3390/polym12040841.
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Component design of rubber-based anti-vibration devices remains a challenge, since there is a lack of predictive models in the typical regimes encountered by anti-vibration devices that are deformed to medium dynamic strains (0.5 to 3.5) at medium strain rates (0.5/s to 10/s). An approach is proposed that demonstrates all non-linear viscoelastic effects such as hysteresis and cyclic stress softening. As it is based on a free-energy, it is fast and easily implementable. The fitting parameters behave meaningfully when changing the filler volume fraction. The model was implemented for use in the commercial finite element software ABAQUS. Examples of how to fit experimental data and simulations for a variety of carbon black filled natural rubber compounds are presented.
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Wojnowski, Jacek, and Jarosław Chmiel. "Personalized Anti-Vibration Protection for Telematics Devices in Urban Freight Transport Vehicles." Energies 14, no. 14 (2021): 4193. http://dx.doi.org/10.3390/en14144193.
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Vibrations are a major cause of human health disorders, circuit boards and machinery damage. Vibration dampers are considered to be the best option to counter these issues. Three-dimensional printing techniques play an increasingly important role in manufacturing small polymer parts with tailored properties. Thermoplastic elastomers (TPE) constitute a perfect material for manufacturing small-scale series absorber prototypes due to their thermoplastic nature, good elasticity and damping properties. This paper proposes a novel multi-level approach to the design and manufacturing process, e.g., the first level—selection of material; second level—decision about the geometry of a damper; third—selection of technological printing parameters; fourth—post-printing treatment. This work primarily aims to overview the design and manufacturing process levels. The impact of each step on the damping capacity of small absorbers is assessed. It was found that thermoplastic elastomers and fused deposition modeling (FDM) have huge potential in shaping the physical properties of small, elastomeric absorbers. It was assessed that at every step of the multilevel design and manufacturing process (MDMP), the designer could tailor the damping to meet the desired criteria of a final product: a cylinder-shaped hollow damper that can be made from TPE polymer without post-printing treatment and is characterized by good damping.
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Sawczuk, Aleksandra, and Bartlomiej Chojnacki. "Mitigation of Structural Vibrations in Sensitive Audio Devices: A Study on Isolation Materials for Lightweight Turntables." Materials 18, no. 11 (2025): 2617. https://doi.org/10.3390/ma18112617.
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Effective vibration isolation is critical for minimizing the transmission of unwanted mechanical energy from a source to its surrounding environment, especially in precision systems, where even minor disturbances can degrade performance. This study addresses the challenge of low-frequency vibration transmission in lightweight, high-sensitivity audio devices such as turntables with masses below 10 kg. Traditional vibration mitigation strategies—primarily based on increasing system mass to raise the resonant frequency—are unsuitable for such systems due to weight constraints and potential impacts on operational dynamics. Previous studies have identified a critical resonance range of 5–15 Hz, corresponding to the tonearm and cartridge assembly, where transmitted vibrations can compromise signal fidelity and cause mechanical degradation. This research aims to develop an effective and universal vibration isolation solution tailored for lightweight turntables, focusing on external isolation from structural vibration sources such as furniture and flooring. To achieve this, a two-stage experimental methodology was employed. In the first stage, the excitation method with the use of a hammer tapping machine was evaluated for its ability to simulate real-world vibrational disturbances. The most representative excitation methods were then used in the second stage, where the isolation performance of various materials and systems was systematically assessed. Tested isolation strategies included steel springs, elastomeric dampers, and commercial linear vibration isolators. The effectiveness of each isolation material was quantified through spectral analysis and transfer function modeling of vibration acceleration data. The results provide comparative insights into material performance and offer design guidance for the development of compact, high-efficiency anti-vibration platforms for audio turntables and similar precision devices.
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Wang, Sha, Cheng Chen, Liqing Hu, and Shuyu Lin. "Spherical piezoelectric transducers of functionally graded materials." Journal of the Acoustical Society of America 152, no. 1 (2022): 193–200. http://dx.doi.org/10.1121/10.0011790.
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In this work, a functionally graded spherical piezoelectric transducer (FG-sPET) is proposed and an accurate theoretical model is constructed, mainly composed of a three-port electromechanical equivalent circuit model (EECM). The EECM of FG-sPET can be connected to that of other vibration systems according to the boundary conditions (force and vibration velocity), making it easier to evaluate the whole mechanical vibration system. The validity of the EECM for FG-sPET is verified by comparison with other literature. The effects of geometric dimensions and non-uniform coefficients on the vibration characteristics (resonance/anti-resonance frequencies and effective electromechanical coupling coefficient) of FG-sPET are also studied, contributing to systematically evaluating the key factors determining the vibration characteristics of FG-sPET. The proposed analytical system is of excellent guidance for the structural optimization design of functionally graded piezoelectric devices.
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Korobiichuk, Igor, Viktorij Mel’nick, Vera Kosova, Viktoriia Pavlenko, and Kirilo Bursacov. "Study of Systems of Active Vibration Protection of Navigation Instrument Equipment." Applied System Innovation 7, no. 5 (2024): 95. http://dx.doi.org/10.3390/asi7050095.
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Assessment of the influence of vibration isolator parameters on the distribution of the system’s natural frequencies is a significant task in the design of vibration isolation systems. The root method was used to determine the natural frequencies of the controlled vibration isolator. For a certain feedback structure of a controlled electrodynamic type vibration isolator, the need for a consistent selection of parameters has been justified. A mathematical solution has been proposed for the approximate determination of the roots of the characteristic equation of the controlled vibration isolator, which enables the analytical assessment of the influence of the vibration isolator parameters on the distribution of its natural frequencies. The research has been conducted in relative parameters, which makes it possible to generalize the results. The specificity of the inertial dynamic vibration isolator, which in some cases is associated with the implementation of anti-resonance conditions, can lead to the fact that resonant frequencies can occur on both sides of the tuning frequency of the vibration isolator. The use of an elastic suspension on flat springs to protect navigation equipment from vibration allows reduction in the intensity of translational vibration, while not changing the orientation of the device relative to the Earth. The implementation of an elastic suspension according to the scheme of the inverted pendulum allows an increase in the effectiveness of vibration isolation, under the conditions of a controlled change of the vibration isolator parameters and due to the use of feedback. The results of this research can be used in precision systems, such as vibration isolators, laser processing equipment, ultraprecision measurements or medical devices.
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WANG, Min. "Measurement and analysis of the Dynamic Characteristics of Anti-vibration Devices Containing Electrorheological Fluids." Chinese Journal of Mechanical Engineering 44, no. 10 (2008): 196. http://dx.doi.org/10.3901/jme.2008.10.196.
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Peng, Liping, Huihui Feng, Zhenqian Wang, Haoyu Wang, Huan Yang, and Huan Huang. "Screening Mechanism and Properties of a Cantilevered Vibrating Sieve for Particles Processing." Applied Sciences 9, no. 22 (2019): 4911. http://dx.doi.org/10.3390/app9224911.
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Screening of fine wet particles or near-aperture particles by traditional screen devices is often not quite effective for sieve plugging. Different from traditional rigid regular mesh sieves, a cantilevered vibrating sieve (CVS) with open screen holes, composed of cantilevered sieve rods, was proposed in this paper. The CVS proved to have a higher screen-penetrating probability relative to traditional sieves. By establishing a bending vibration model for the CVS, it can be found that additional vibrations may emerge during the screen body motion, and a smaller difference between the natural circular frequency and the vibration frequency will achieve a larger vibration of cantilevered sieve rod. On this basis, this investigation also analyzed anti-plugging mechanism of the CVS and systematically discussed the influence laws of the geometric parameters and vibration parameters of the sieve on screening efficiency by the discrete element method.
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Chen, Liang Chia, Abraham Mario Tapilouw, Sheng Lih Yeh, Shyh Tsong Lin, Jin Liang Chen, and Huan Chi Huang. "Development of Innovative Fringe Locking Strategies for Vibration-Resistant White Light Vertical Scanning Interferometry (VSI)." Key Engineering Materials 437 (May 2010): 89–94. http://dx.doi.org/10.4028/www.scientific.net/kem.437.89.
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White light interferometry has become an important method for measuring micro surface profiles with a long vertical range and nano-scale resolution. However, environmental vibration encountered in in-field optical inspection is usually unavoidable and it affects measurement performance significantly. Isolating vibration sources from the measurement system sometimes is not completely effective, especially within complicated in-field fabrication environment. Therefore, in this research we aim to develop a novel method in achieving white-light fringe-locking condition during vertical scanning processes. The developed optical system consists of white light source, a Mirau objective, a PZT vertical scanner, an optical band-pass filter and two image sensing devices. The developed system generates a high and a low coherent interferograms, simultaneously captured by two charged coupled devices (CCDs). The high coherent interferogram is employed to detect high-speed nano-scale displacement and direction of the external vibration. An innovative real time fringe-locking operation is performed and a new vertical scanning technique is performed accordingly to isolate vertical scanning from environmental disturbances. The feasibility of the anti-vibration VSI system is verified by performing some of industrial in-field examples. Based on the experimental result, the fringe locking technique can improve the measurement result.
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Shi, Xin, Yuhua Xiong, and Huating Wu. "Influence of Barrier Layers on ZrCoCe Getter Film Performance." Materials 16, no. 7 (2023): 2916. http://dx.doi.org/10.3390/ma16072916.
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Improving the vacuum degree inside the vacuum device is vital to the performance and lifespan of the vacuum device. The influence of the Ti and ZrCoCe barrier layers on the performance of ZrCoCe getter films, including sorption performance, anti-vibration performance, and binding force between the ZrCoCe getter film and the Ge substrate were investigated. In this study, the Ti and ZrCoCe barrier layers were deposited between the ZrCoCe getter films and Ge substrates. The microtopographies of barrier layers and the ZrCoCe getter film were analyzed using scanning electron microscopes. The sorption performance was evaluated using the constant-pressure method. The surface roughness of the barrier layers and the getter films was analyzed via atomic force microscopy. The binding force was measured using a nanoscratch tester. The anti-vibration performance was examined using a vibration test bench. The characterization results revealed that the Ti barrier layer significantly improved the sorption performance of the ZrCoCe getter film. When the barrier material was changed from ZrCoCe to Ti, the initial sorption speed of the ZrCoCe getter film increased from 141 to 176 cm3·s−1·cm−2, and the sorption quantity increased from 223 to 289 Pa·cm3·cm−2 in 2 h. The binding force between the Ge substrate and the ZrCoCe getter film with the Ti barrier layer was 171 mN, whereas that with the ZrCoCe barrier layer was 154 mN. The results showed that the Ti barrier layer significantly enhanced the sorption performance and binding force between the ZrCoCe getter film and the Ge substrate, which improved the internal vacuum level and the stability of the microelectromechanical system vacuum devices.
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Uchino, Kenji. "Introduction to Piezoelectric Actuators: Research Misconceptions and Rectifications - Part II." Insight - Material Science 2, no. 1 (2020): 29. http://dx.doi.org/10.18282/ims.v2i1.253.
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<p>Piezoelectric actuator developments require interdisciplinary knowledge on materials physics, electrical designing and mechanical engineering. Because of the limited knowledge of newly-involved researchers, they occasionally publish misleading information, some sort of misconceptions, reflected in the delay of innovative developments of the next generation. This paper is Part II of a series of my tutorial course, and reviews the popular 10 among the researchers’ misconceptions primarily related with the misunderstanding of ‘voltage and electric field’, ‘ionic displacement and strain’, ‘thin film fabrication’, ‘energy transmission coefficient’, ‘thin film device designing’, ‘piezoelectric vibration damping’, ‘mechanical impedance matching’, ‘piezoelectric energy harvesting”, ‘resonance &amp; anti-resonance’, ‘best-selling devices’, and provides rectifications, aiming at their future progress.</p>
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Wang, Zhe, Yuan-hua Yu, Zhan-jiang Yu, and Qi-meng Chen. "Blood coagulation dynamic testing sensor based on electromagnetic vibration." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 233, no. 6 (2019): 611–20. http://dx.doi.org/10.1177/0954411919837308.
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Rapid detection techniques and methods of blood coagulation have attracted wide attention in academia and the business community in the presence of the increased demands for rapid assessment (point-of-care testing) of patients from surgery, intensive care unit, and other departments. The differential equation of vibration system composed of elastic support and electromagnetic induction devices was set up using the principle of damping vibration and establishing the dynamics model; meanwhile, the harmonic response analysis and vibration fatigue coupling analysis were carried out, the analysis results were optimized, and the experimental device of the electromagnetic induction testing sensor was established. In addition, the experimental device with blood coagulation reagent was assorted to establish the standard point-of-care testing rapid blood coagulation detection curve, and to compare the testing curve with that of the imported point-of-care testing blood coagulation instrument. The results showed that the first-order natural frequency of the designed sensor was 102.35 Hz, the correlation between the designed sensor and the imported equipment was 0.996, and the testing repeatability of the designed sensor could reach 0.002. Therefore, the designed blood coagulation testing sensor based on electromagnetic induction had the characteristics of favorable elasticity and anti-fatigue, which could meet the accuracy requirements of clinical detection. Taken together, this study could provide the core technology for developing the point-of-care testing instrument for blood coagulation dynamic testing.
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Dobrescu, Cornelia. "Dynamic Response of the Newton Voigt–Kelvin Modelled Linear Viscoelastic Systems at Harmonic Actions." Symmetry 12, no. 9 (2020): 1571. http://dx.doi.org/10.3390/sym12091571.
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The variety of viscoelastic systems and structures, for the most part, is studied analytically, with significant results. As a result of analytical, numerical and experimental research, which was conducted on a larger variety of linear viscoelastic systems and structures. We analyzed the dynamic behavior for the viscoelastic composite materials, anti-vibration viscous-elastic systems consisting of discrete physical devices, road structures consisting of natural soil structures with mineral aggregates and asphalt mixes, and mixed mechanic systems of insulation of the industrial vibrations consisting of elastic and viscous devices. In this context, the compound rheological model can be schematized as being V−(E|V) type of the Newton Voigt–Kelvin model with inertial excited mass, applicable to linear viscoelastic materials.
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Bratu, Polidor, and Cornelia Dobrescu. "Dynamic Response of Zener-Modelled Linearly Viscoelastic Systems under Harmonic Excitation." Symmetry 11, no. 8 (2019): 1050. http://dx.doi.org/10.3390/sym11081050.
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A comprehensive investigation, including analytical modelling, numerical analysis and experimental tests, has been carried out on many linear viscoelastic systems and structures. This approach is the result of research conducted by two research institutes, ICECON and INCERC Bucharest, from Romania. Thus, analyses were performed on the dynamic behaviour of composite viscoelastic materials, anti-vibration viscoelastic systems made of discrete physical devices, road structures consisting of layers of natural soil with mineral aggregates and asphalt mixtures, and mixed mechanic insulation systems for industrial vibrations formed of elastic and viscous devices. The objectives pursued were as follows: (a) providing a mass dosage of the mixture of earth (clay, sand, mineral aggregates, water, and stabilizer) in five variants; (b) carrying out a test run with a Bomag vibratory roller with variable vibration parameters; (c) Experimental evaluation of the vibration parameters and the force transmitted to the ground, correlated with the determination of the compaction layer; (d) use of methods of analysis for physic-mechanical and geotechnical parameters; (e) rheological and numerical modeling based on Zener schematics, so the consistency and veracity of the experimental data with the numerical simulation can be determined. Finally, a study is presented for a test track, where experimental and correlated input and response data are determined to validate the rheological model with a high loading rate.
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Dai, Yingdong, Meng Jie, and Yiming Zhang. "STM32-Based Piezoelectric Ceramic Control System." Frontiers in Computing and Intelligent Systems 12, no. 1 (2025): 150–56. https://doi.org/10.54097/7w0am849.
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To address the high-frequency vibration driving requirements of piezoelec-tric ceramics, this paper proposes a novel control system based on an STM32 microcontroller, aiming to simplify circuit architecture while enhancing anti-interference capability and driving efficiency. The system employs the STM32F407 as the main controller, achieving high-precision digital-to-analog conversion through SPI communication with an external DAC8311 module, and integrates a TPA3106 power amplifier and transformer to drive the piezoelectric ceramic. Waveforms are generated using DSP instructions to optimize computational resource utilization, and a soft-start function is implemented to enable a gradual voltage ramp-up, effectively suppressing inrush current during power-on. Collaborative control via timer interrupts and external interrupts facilitates smooth switching and stable adjustment of frequency (100–250 Hz) and amplitude (0–3.3 V). Experimental results demonstrate optimal vibration intensity at 213 Hz. The system supports flexible parameter tuning for frequency and amplitude, exhibiting high versatility and reliability. This design provides a compact and efficient solution for high-frequency vibration driving, with significant application potential in industrial feeding, ultrasonic devices, and related fields.
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Zhang, Lilei, Zhipeng Huang, Chengwei Fu, Yuepeng Xu, Yunhe Wang, and Xiangdong Kong. "Design and Verification of Two-Stage Brake Pressure Servo Valve for Aircraft Brake System." Processes 9, no. 6 (2021): 979. http://dx.doi.org/10.3390/pr9060979.
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Wheel braking devices is some of the most widely used landing deceleration devices in modern aircraft. Jet pipe pressure servo valves are widely used in large aircraft wheel brake control systems because of their high anti-pollution ability, high sensitivity and fast dynamic response. However, most brake systems suffer vibration phenomena during the braking process. The pressure servo valve is an important part of the hydraulic brake system, and also an important factor affecting the vibration of the system. In order to solve the vibration problem in the brake system this paper present a two-stage brake pressure servo valve design. We place feedback channels at both ends of the main spool to stabilize the output pressure. In addition, modeling, simulation and experimental verifications are carried out. Firstly, the principle and structure of the pressure servo valve are described. An accurate mathematical model of the two-stage brake pressure servo valve and the testing system is established. Then a simulation analysis is carried out. Finally, a two-stage brake pressure servo valve testing experimental platform system is built for experimental verification. The experimental results show that the mathematical model of the two-stage brake pressure servo valve and the test system established in this paper have high accuracy, and the designed servo valve structure can restrain vibrations. The above research results provide a useful theoretical reference for performance optimization, stability analysis and valve body structure improvement of brake pressure servo valves.
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Vasile, Ovidiu, and Mihai Bugaru. "A New Modeling Approach for Viscous Dampers Using an Extended Kelvin–Voigt Rheological Model Based on the Identification of the Constitutive Law’s Parameters." Computation 11, no. 1 (2022): 3. http://dx.doi.org/10.3390/computation11010003.
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In addition to elastomeric devices, viscous fluid dampers can reduce the vibration transmitted to dynamic systems. Usually, these fluid dampers are rate-independent and used in conjunction with elastomeric isolators to insulate the base of buildings (buildings, bridges, etc.) to reduce the shocks caused by earthquakes by increasing the damping capability. According to the EN 15129 standard, the velocity-dependent anti-seismic devices are Fluid Viscous Dampers (FVDs) and Fluid Spring Dampers (FSDs). Based on experimental data from a dynamic regime of a fluid viscous damper of small dimensions, for which not all the design details are known, to determine the law of behavior for the viscous damper, the characteristics of the damper are identified, including the nonlinear parameter α (exponent of velocity V) of the constitutive law. Note that the magnitude of the fluid damper force depends on both velocity (where the maximum value is 0.52 m/s) and amplitude displacement (±25 mm). Using the Kelvin–Voigt rheological models, the dynamic response of a structure fixed with a fluid viscous device is analyzed, presenting the reaction force and displacement during the parameterized application of an external shock. This new approach for FVDs/FSDs was validated using the standard deviation between the experimental data and the numerical results of the extended Kelvin–Voigt model offering researchers in the field of seismic devices a reliable method to obtain a constitutive law for such devices.
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Deng, Tian, Shunzu Zhang, and Yuanwen Gao. "A Magnetic-Dependent Vibration Energy Harvester Based on the Tunable Point Defect in 2D Magneto-Elastic Phononic Crystals." Crystals 9, no. 5 (2019): 261. http://dx.doi.org/10.3390/cryst9050261.
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In this work, an innovative vibration energy harvester is designed by using the point defect effect of two-dimensional (2D) magneto-elastic phononic crystals (PCs) and the piezoelectric effect of piezoelectric material. A point defect is formed by removing the central Tenfenol-D rod to confine and enhance vibration energy into a spot, after which the vibration energy is electromechanically converted into electrical energy by attaching a piezoelectric patch into the area of the point defect. Numerical analysis of the point defect can be carried out by the finite element method in combination with the supercell technique. A 3D Zheng-Liu (Z-L) model which accurately describes the magneto-mechanical coupling constitutive behavior of magnetostrictive material is adopted to obtain variable band structures by applied magnetic field and pre-stress along the z direction. The piezoelectric material is utilized to predict the output voltage and power based on the capacity to convert vibration energy into electrical energy. For the proposed tunable vibration energy harvesting system, numerical results illuminate that band gaps (BGs) and defect bands of the in-plane mixed wave modes (XY modes) can be adjusted to a great extent by applied magnetic field and pre-stress, and thus a much larger range of vibration frequency and more broad-distributed energy can be obtained. The defect bands in the anti-plane wave mode (Z mode), however, have a slight change with applied magnetic field, which leads to a certain frequency range of energy harvesting. These results can provide guidance for the intelligent control of vibration insulation and the active design of continuous power supply for low power devices in engineering.
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Cai, Lin Jun, Zheng Ying Li, Zhi Hao Tang, Wei Meng, and Quan Liu. "A Novel Peak-Seek Algorithm Used in FBG Sensor Demodulation System for Vibration Monitoring." Applied Mechanics and Materials 160 (March 2012): 135–39. http://dx.doi.org/10.4028/www.scientific.net/amm.160.135.
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The FBG sensor technologies used for real-time monitoring of the mechanical vibration have attracted more and more concerns from both academic and industrial domains. In practical applications, the vibration frequency of the equipments generally reach up to a few hundred to several thousand Hz, however, the existing FBG demodulator is incompetent to meet the actual requirements of vibration monitoring in terms of demodulation speed and algorithm structures. To solve this problem while achieving a higher accuracy at a relatively lower computation cost, a novel adaptive semi-peak-seek algorithm based on state machine is proposed, which can be divided into three parts including data collection, data analysis and data verification. The experiment result shows that for the demodulation speed of 2 KHz, we can reach a demodulation accuracy of 1pm and a static noise within ±2pm. On the basis of a long term test, the stability error that less than 2pm and the system dynamic range of 0~ -30db are concluded, and the measurement error with the optical power attenuation is limited to 4pm. Thus, the proposed algorithm is capable to meet the requirements of high-speed demodulation devices in terms of speed, precision, stability and anti-interference properties.
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Zheng, Gaoan, Zeheng Gu, Weixin Xu, et al. "Gravitational Surface Vortex Formation and Suppression Control: A Review from Hydrodynamic Characteristics." Processes 11, no. 1 (2022): 42. http://dx.doi.org/10.3390/pr11010042.
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The energy-conversion stability of hydropower is critical to satisfy the growing demand for electricity. In low-head hydropower plants, a gravitational surface vortex is easily generated, which causes irregular shock vibrations that damage turbine performance and input-flow stability. The gravitational surface vortex is a complex fluid dynamic problem with high nonlinear features. Here, we thoroughly investigate its essential hydrodynamic properties, such as Ekman layer transport, heat/mass transfer, pressure pulsation, and vortex-induced vibration, and we note some significant scientific issues as well as future research directions and opportunities. Our findings show that the turbulent Ekman layer analytical solution and vortex multi-scale modeling technology, the working condition of the vortex across the scale heat/mass transfer mechanism, the high-precision measurement technology for high-speed turbulent vortexes, and the gas–liquid–solid three-phase vortex dynamics model are the main research directions. The vortex-induced vibration transition mechanism of particle flow in complex restricted pipelines, as well as the improvement of signal processing algorithms and a better design of anti-spin/vortex elimination devices, continue to draw attention. The relevant result can offer a helpful reference for fluid-induced vibration detection and provide a technical solution for hydropower energy conversion.
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Kir'yanova, V. V., M. Yu Gerasimenko, M. N. Shorokhova, and K. V. Gorbacheva. "Vibrotherapy in medical practice." Russian Journal of Physiotherapy, Balneology and Rehabilitation 19, no. 3 (2021): 171–77. http://dx.doi.org/10.17816/1681-3456-2020-19-3-5.
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A review of literature sources on the use of vibrotherapy in physiotherapy is presented. In the mechanism of action of vibrotherapy, the leading role belongs to vibration sensitivity the main link between the human body and the impact on it of the environment. The patient's tissues are affected using devices for vibrotherapy, using mechanical vibrations with a frequency of 10 to 250 Hz in continuous or pulsed modes. Vibrotherapy has trophic, reflex, neuroprotective, myorelaxing, anti-inflammatory, analgesic, oxygenating, antioxidant effects and is recommended for prevention, treatment and rehabilitation in various nosologies and conditions of the human body. In addition to the above, vibrotherapeutic effects contribute to the formation of protective and adaptive mechanisms.
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Moffa, Antonio, Lucrezia Giorgi, Domiziana Nardelli, et al. "The Potential Effect of Changing Patient Position on Snoring: A Systematic Review." Journal of Personalized Medicine 14, no. 7 (2024): 715. http://dx.doi.org/10.3390/jpm14070715.
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Approximately 45% of adults snore occasionally, and 25% snore regularly, with a higher prevalence in men and an increase among postmenopausal women due to hormonal changes. Snoring is a health concern linked to vascular disease and decreased quality of life for both snorers and their bed partners. Effective snoring treatment, which aims to reduce or eliminate the sound, is challenging and depends on factors like age, comorbidities, disease severity, and anatomical features. This review aims to provide a systematic overview of the current literature on the effects of positional therapy (PT) on snoring. Various devices facilitate PT, including anti-snoring pillows and vibration alarms. PT devices maintain head and neck alignment to keep airways open, while head of bed elevation (HOBE) solutions reduce upper airway collapses by elevating the head and trunk. Studies show that PT and HOBE reduce snoring by increasing airway cross-sectional area and decreasing closing pressure. Despite their benefits, these non-surgical treatments have limitations, such as discomfort in certain sleeping positions and intolerance to prolonged head elevation. While reducing snoring intensity is critical for health reasons, further comparative studies between the different devices are needed to enhance snoring management.
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Zhang, Haichun, Jie Wang, Zhuo Chen, Yuqian Pan, Zhaojun Lu, and Zhenglin Liu. "An SVM-Based NAND Flash Endurance Prediction Method." Micromachines 12, no. 7 (2021): 746. http://dx.doi.org/10.3390/mi12070746.
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NAND flash memory is widely used in communications, commercial servers, and cloud storage devices with a series of advantages such as high density, low cost, high speed, anti-magnetic, and anti-vibration. However, the reliability is increasingly getting worse while process improvements and technological advancements have brought higher storage densities to NAND flash memory. The degradation of reliability not only reduces the lifetime of the NAND flash memory but also causes the devices to be replaced prematurely based on the nominal value far below the minimum actual value, resulting in a great waste of lifetime. Using machine learning algorithms to accurately predict endurance levels can optimize wear-leveling strategies and warn bad memory blocks, which is of great significance for effectively extending the lifetime of NAND flash memory devices and avoiding serious losses caused by sudden failures. In this work, a multi-class endurance prediction scheme based on the SVM algorithm is proposed, which can predict the remaining P-E cycle level and the raw bit error level after various P-E cycles. Feature analysis based on endurance data is used to determine the basic elements of the model. Based on the error features, we present a variety of targeted optimization strategies, such as extracting the numerical features closely related to the endurance, and reducing the noise interference of transient faults through short-term repeated operations. Besides a high-parallel flash test platform supporting multiple protocols, a feature preprocessing module is constructed based on the ZYNQ-7030 chip. The pipelined module of SVM decision model can complete a single prediction within 37 us.
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Xu, Cheng Hui, Jing Jing Hu, and Da Lun Rong. "Flexural Wave Propagation of Double-Layered Graphene Sheets Based on the Hamiltonian System." Materials Science Forum 975 (January 2020): 121–26. http://dx.doi.org/10.4028/www.scientific.net/msf.975.121.
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Double-layered graphene sheets (DLGSs) as a new type of nanocomponents, with special mechanical, electrical and chemical properties, have the potential of being applied in the nanoelectro-mechanical systems (NEMS) and nanoopto-mechanical systems (NOMS). In DLGSs structure, the two graphene sheets are connected by van der Waals (vdW) interaction. Thus, it can exhibit two vibration modes during the propagation of the flexural wave, i.e., in-phase mode and anti-phase mode. Based on the Kirchhoff plate theory and the nonlocal elasticity theory, Hamiltonian equations of the DLGSs are established by introducing the symplectic dual variables. By solving the Hamiltonian equation, the dispersion relation of the flexural wave propagation of the DLGSs is obtained. The numerical calculation indicates that the bending frequency, phase velocity and group velocity of the in-phase mode and anti-phase mode for the DLGSs are closely related to the nonlocal parameters, the foundation moduli and the vdW forces. The research results will provide theoretical basis for the dynamic design of DLGSs in micro-nanofunctional devices.
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Dudykevych, Valery, Ivan Opirskyy, Nazariy Dzianyi, Larysa Rakobovchuk, and Petro Garanyuk. "RESEARCH OF OPTIMIZATION OF LAMES OF THE LASER SENSOR OF VIBRATION TO COUNTER LASER INTELLIGENCE SYSTEMS." Cybersecurity: Education, Science, Technique 3, no. 15 (2022): 110–23. http://dx.doi.org/10.28925/2663-4023.2022.15.110123.
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One of the most vulnerable issues in the technical protection of information is the receipt of data, private or confidential, due to leakage through the optoelectronic channel, the main source of data is laser acoustic intelligence systems or laser microphones. There are active and passive methods of protection against laser acoustic reconnaissance systems (ACS). Active methods use various noisy or vibrating devices that pose a danger to human health. With passive protection, it is recommended to use either special corrugated windows or completely closed shutters, which create some inconvenience now. Detecting a working laser microphone is very difficult and in some cases technically impossible. For example, the removal of information using ACS occurs through glass building structures, usually windows. This article is devoted to the analysis of the principle of operation of laser systems of acoustic intelligence and passive methods of reading acoustic information. Triangulation laser sensors are designed for non-contact measurement and control of position, movement, size, surface profile, deformation, vibration, sorting, recognition of technological objects, measuring the level of liquids and bulk materials. Accordingly, they can be used to study the vibrational properties of glass and films applied to them. It is described the method of working with laser triangulation vibration sensors, which allows to study the deviations of glass from different manufacturers from sound vibrations, thereby investigating the anti-laser properties of existing glass, as well as different types of spraying and films. In addition, this method allows you to conduct and test deviations from sound vibrations for new types of glass, films and spraying, proving the results of spectral studies and their impact on the amplitude of vibration of the glass. The vibration sensor was adjusted and the software parameters were experimentally optimized to obtain the truest deviation values required to work with sprayed samples for passive protection.
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Liu, Xiaohui, Jiegang Mou, Xin Xu, Zhi Qiu, and Buyu Dong. "A Review of Pump Cavitation Fault Detection Methods Based on Different Signals." Processes 11, no. 7 (2023): 2007. http://dx.doi.org/10.3390/pr11072007.
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As one of the research hotspots in the field of pumps, cavitation detection plays an important role in equipment maintenance and cost-saving. Based on this, this paper analyzes detection methods of cavitation faults based on different signals, including vibration signals, acoustic emission signals, noise signals, and pressure pulsation signals. First, the principle of each detection method is introduced. Then, the research status of the four detection methods is summarized from the aspects of cavitation-induced signal characteristics, signal processing methods, feature extraction, intelligent algorithm identification of cavitation state, detection efficiency, and measurement point distribution position. Among these methods, we focus on the most widely used one, the vibration method. The advantages and disadvantages of various detection methods are analyzed and proposed: acoustic methods including noise and acoustic emission can detect early cavitation very well; the vibration method is usually chosen first due to its universality; the anti-interference ability of the pressure pulsation method is relatively strong. Finally, the development trend of detecting cavitation faults based on signals is given: continue to optimize the existing detection methods; intelligent algorithms such as reinforcement learning and deep reinforcement learning will be gradually integrated into the field of cavitation status identification in the future; detection systems still need to be further improved to accommodate different types of pumps; advanced sensing devices combined with advanced signal processing techniques are one of the effective means to detect cavitation in a timely manner; draw on other fault detection methods such as bearing faults and motor faults.
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Baginski, Thomas A., and Robert N. Dean. "The Reactive Bridge: A Novel Solid-State Low Energy Initiator." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, DPC (2012): 000586–614. http://dx.doi.org/10.4071/2012dpc-ta31.
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Within a broad variety of commercial (i.e. automotive airbags, mining) and government ordnance systems there exists an interface which utilizes electrical energy to initiate an exothermic reaction (i.e. combustion, deflagration, detonation). The structure that performs this function is commonly referred to as an Electro-explosive device (EED). The basic EED design is susceptible to initiation failures due to mechanical hazards such vibration and shock. This paper discusses the fabrication and characterization of a micro-machined EED (the Reactive Bridge) which is mechanically robust, extremely reliable and inexpensive to manufacture. The structure is capable of directly initiating a wide variety of pyrotechnics and primary explosives. The Reactive Bridge offers the additional advantage of being able to be directly fabricated onto any custom integrated circuit. This feature may be of particular interest for adding anti-tamper features directly at the individual die level of electronic systems. The structure consists of patterned sequential layers of titanium and boron which react exothermically when properly initiated. Design parameters will be discussed and compared to firing data for Reactive Bridge EEDs loaded with fine grain zirconium potassium perchlorate (ZPP). A number of different sized bridges were investigated. Scanning electron microscope photographs of cross-sectioned devices before and after firing will also be discussed.
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Zhang, Qing, Xing Fu, Zhiguo Sun, and Liang Ren. "A Smart Multi-Rate Data Fusion Method for Displacement Reconstruction of Beam Structures." Sensors 22, no. 9 (2022): 3167. http://dx.doi.org/10.3390/s22093167.
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Dynamic displacement plays an essential role in structural health monitoring. To overcome the shortcomings of displacement measured directly, such as installation difficulty of monitoring devices, this paper proposes a smart reconstruction method, which can realize real-time intelligent online reconstruction of structural displacement. Unlike the existing approaches, the proposed algorithm combines the improved mode superposition methods that is suitable for complex beam structures with the Kalman filtering approach using acceleration and strain data. The effectiveness of the proposed multi-rate data fusion method for dynamic displacement reconstruction is demonstrated by both numerical simulation and model vibration experiment. Parametric analysis shows that the reconstruction error is only 5% when the noise signal to noise ratio is 5 dB, illustrating that the proposed algorithm has excellent anti-noise performance. The results also indicate that both the high-frequency and low-frequency components of the dynamic displacements can be accurately reconstructed through the proposed method, which has good robustness.
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Okulov, Valery, Ivan Kabardin, Dmitry Mukhin, Konstantin Stepanov, and Nastasia Okulova. "Physical De-Icing Techniques for Wind Turbine Blades." Energies 14, no. 20 (2021): 6750. http://dx.doi.org/10.3390/en14206750.
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The review reflects physical solutions for de-icing, one of the main problems that impedes the efficient use of wind turbines for autonomous energy resources in cold regions. This topic is currently very relevant for ensuring the dynamic development of wind energy in the Arctic. The review discusses an effective anti-icing strategy for wind turbine blades, including various passive and active physical de-icing techniques using superhydrophobic coatings, thermal heaters, ultrasonic and vibration devices, operating control to determine the optimal methods and their combinations. After a brief description of the active methods, the energy consumption required for their realization is estimated. Passive methods do not involve extra costs, so the review focuses on the most promising solutions with superhydrophobic coatings. Among them, special attention is paid to plastic coatings with a lithographic method of applying micro and nanostructures. This review is of interest to researchers who develop new effective solutions for protection against icing, in particular, when choosing systems for protecting wind turbines.
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Pokusaev, Mikhail N., Maksim M. Gorbachev, and Adel D. Ibadullaev. "EXPERIMENTAL EVALUATION OF THE ANTIVIBRATOR TECHNICAL CONDITION." Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 14, no. 4 (2022): 591–99. http://dx.doi.org/10.21821/2309-5180-2022-14-4-591-599.
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One of the key problems that have developed today in the fleet during the operation of ships is the termination of supplying products from leading foreign manufacturers of dampers and antivibrators of torsional vibrations, which ensure the safe operation of critical elements of the engine complex. Also, the next confirmation of relevance is the fact that there are no maintenance service centers on the territory of the Russian Federation, nor specialists who carry out the defection and repair of such devices. The results of experimental studies to assess changes in the technical condition of the antivibrator, which is the driven part of the clutch disc of a well-known foreign manufacturer for a KAMAZ truck, at the laboratory stand of the Marine Technology Service testing center of the Astrakhan State Technical University, are presented in the paper. The purpose of the tests is to evaluate the changes in vibration and torsional vibrations occurring in the elements of the laboratory stand at different states of the damping springs of the antivibrator. It should be noted that this device is used on YAMZ-236 engines, which is convertible on the ship. The change in the technical condition of the antivibrator is ensured by a complete limitation of the stroke (jamming) of the damping springs. Mechanical jamming is performed sequentially for each spring package and by measuring tangential stresses in the shaft of the laboratory stand and vibration acceleration on the bearing assembly rack. To conduct the experiments, the measuring base of the test center, including a torsional vibration monitoring system, a 1st class vibrometer, an Ecophysics-110 spectrum analyzer, etc., is used. It has been experimentally established that when the free travel of the damping springs of the anti-vibrator is completely limited, tangential stresses in the shaft and vibrations on the bearing assembly of the laboratory stand increase. It is also determined that the average tangential stresses in the shaft are more effective in terms of the criterion for diagnosing the antivibrator technical condition than the maximum stresses. The most informative for antivibration diagnostics are the octave frequencies of 4, 63 and 125 Hz, at which there is a significant change in vibration acceleration along all three axes X, Y, Z, depending on the number of jammed springs. The accumulation of theoretical and practical research in this area, in the future, may lead to the development of a methodology for the non-selective assessment of the technical condition of ship mechanical dampers and antivibrators of torsional vibrations.
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Beskos, Dimitri E. "Boundary Element Methods in Dynamic Analysis." Applied Mechanics Reviews 40, no. 1 (1987): 1–23. http://dx.doi.org/10.1115/1.3149529.
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A review of boundary element methods for the numerical solution of dynamic problems of linear elasticity is presented. The integral formulation and the corresponding numerical solution of three- and two-dimensional elastodynamics from the direct boundary element method viewpoint and in both the frequency and time domains are described. The special case of the anti-plane motion governed by the scalar wave equation is also considered. In all the cases both harmonic and transient dynamic disturbances are taken into account. Special features of material behavior such as viscoelasticity, inhomogeneity, anisotropy, and poroelasticity are briefly discussed. Some other nonconventional boundary element methods as well as the hybrid scheme that results from the combination of boundary and finite elements are also reviewed. All these boundary element methodologies are applied to: soil-structure interaction problems that include the dynamic analysis of underground and above-ground structures, foundations, piles, and vibration isolation devices; problems of crack propagation and wave diffraction by cracks; and problems dealing with the dynamics of beams, plates, and shells. Finally, a brief assessment of the progress achieved so far in dynamic analysis is made and areas where further research is needed are identified.
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Gebai, Sarah, Mohammad Hammoud, Ali Hallal, and Ali AL Shaer. "Structural control and biomechanical tremor suppression: Comparison between different types of passive absorber." Journal of Vibration and Control 24, no. 12 (2017): 2576–90. http://dx.doi.org/10.1177/1077546316689200.
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Active and semi-active control devices can be used as advanced and accurate controllers to reduce the undesired vibration of a structure. However, some of these controllers may have a complex design, especially for systems excited with multi-degree-of-freedom frequencies, which demand the use of high anti-fatigue material properties, and others that may require a large power source. So, improvements in the design of passive controllers are of high interest for researchers. These controllers have a very simple design and aim to counteract vibration with no power requirements. In this paper, six different passive controllers were designed to analyze and compare their performance. The performance is considered in terms of the percentage of reduction in the primary system’s displacement amplitude and the bandwidth of each designed passive controller. The system of interest is taken as the three-degree-of-freedom dynamic hand system reflecting the behavior of Parkinsonian patients. Four joint muscles operating at two resonance harmonic excitation frequencies are considered to produce movements. Each controller was attached to the forearm of the hand set in the horizontal plane to analyze their capability in reducing the rest tremor (3–7 Hz) at the proximal joint. The dual series elastic–viscous absorber is shown to be a very effective controller. It is formed from a series connection between an elastic absorber (mass–spring) and a viscous absorber (mass–dashpot). It causes about 80% reduction in tremor amplitude with 4 Hz wide frequency band at the shoulder, elbow and wrist joints. This range of operational frequency is close to that of healthy cases, 4.5 Hz.
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Shibayama, Atsushi. "Anti-vibration optical device." Journal of the Acoustical Society of America 101, no. 4 (1997): 1763. http://dx.doi.org/10.1121/1.418184.
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Wang, Bochao, and Leif Kari. "Constitutive Model of Isotropic Magneto-Sensitive Rubber with Amplitude, Frequency, Magnetic and Temperature Dependence under a Continuum Mechanics Basis." Polymers 13, no. 3 (2021): 472. http://dx.doi.org/10.3390/polym13030472.
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A three-dimensional nonlinear constitutive model of the amplitude, frequency, magnetic and temperature dependent mechanical property of isotropic magneto-sensitive (MS) rubber is developed. The main components of MS rubber are an elastomer matrix and magnetizable particles. When a magnetic field is applied, the modulus of MS rubber increases, which is known as the magnetic dependence of MS rubber. In addition to the magnetic dependence, there are frequency, amplitude and temperature dependencies of the dynamic modulus of MS rubber. A continuum mechanical framework-based constitutive model consisting of a fractional standard linear solid (SLS) element, an elastoplastic element and a magnetic stress term of MS rubber is developed to depict the mechanical behavior of MS rubber. The novelty is that the amplitude, frequency, magnetic and temperature dependent mechancial properties of MS rubber are integrated into a whole constitutive model under the continuum mechanics frame. Comparison between the simulation and measurement results shows that the fitting effect of the developed model is very good. Therefore, the constitutive model proposed enables the prediction of the mechanical properties of MS rubber under various operating conditions with a high accuracy, which will drive MS rubber’s application in engineering problems, especially in the area of MS rubber-based anti-vibration devices.
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Carleo, Francesca, Ettore Barbieri, Roly Whear, and James Busfield. "Limitations of Viscoelastic Constitutive Models for Carbon-Black Reinforced Rubber in Medium Dynamic Strains and Medium Strain Rates." Polymers 10, no. 9 (2018): 988. http://dx.doi.org/10.3390/polym10090988.
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Modelling the viscoelastic behavior of rubber for use in component design remains a challenge. Most of the literature does not consider the typical regimes encountered by anti-vibration devices that are deformed to medium dynamic strains (0.5 to 3.5) at medium strain rates (0.5/s to 10/s). Previous studies have either focused on the behaviour at small strains and small strain rates or in fast loading conditions that result in low cycle fatigue or tearing phenomena. There is a lack of understanding of the dynamic response of natural rubber suspension components when used in real vehicle applications. This paper presents a review of popular viscoelastic nonlinear constitutive models and their ability to model the mechanical behaviour of typical elastomer materials such as Natural Rubber (NR) incorporating different PHR (Parts per Hundred Rubber, XX) of carbon black. The range of strain and strain rate are typical for the materials used in rubber suspensions when operating in severe service operating conditions, such as over rough terrain or over pot-holes. The cyclic strain is applied at different amplitudes and different strain rates in this medium strain range. Despite the availability of many models in the literature, our study reports that none of the existing models can fit the data satisfactorily over a wide range of conditions.
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Thompson, Myron P., and Cecil E. Thompson. "Compound bow anti vibration and noise device." Journal of the Acoustical Society of America 98, no. 6 (1995): 3026. http://dx.doi.org/10.1121/1.413858.
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Xie, Mengfei, Weibing Xu, Jin Wang, et al. "Preliminary Study on the Damping Effect of a Rotational Inertia Particle Damper Considering the Explosion Response of Continuous Concrete Bridges." Buildings 13, no. 7 (2023): 1726. http://dx.doi.org/10.3390/buildings13071726.
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The possibility of blast impact loads acting on bridge structures is gradually increasing. The local and entire explosion response law of a concrete box girder bridge is still unclear, and anti-explode devices for reducing the entire explosion response of a bridge are scarce. In this study, a rotational inertia particle damper (R-IPD) and a 1:4 scale model of a typical three-span continuous-girder bridge were designed and manufactured. Subsequently, an explosion test of the bridge model with and without R-IPDs was conducted. The results showed that the local dynamic response (LDR) of the bridge model was more likely to occur under an explosion load. The local overpressure, strain, and acceleration responses of the box girder near the explosion centre were more significant than those at other locations or of other components. Moreover, the LDR of the box girder was similar in the middle and side spans. As the explosive equivalent (EE) increased, the entire displacement response (EDR) of the model bridge increased. Under the same EE conditions, a larger span suffered a larger EDR. After the R-IPD installation, the EDR of the bridge model decreased. Furthermore, the damping effect of the R-IPDs on the EDR of the bridge model increased with an increase in the EE, and the maximum vibration reduction rate was up to 12%. However, the damping effect of the R-IPDs on the LDR of the model bridge was not obvious. The damping effect of the R-IPDs depended on the relative displacement between the two ends of the damper and exhibited obvious hysteresis.
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Liu, Chen. "Combat Response Training Tester Based on Intelligent Force-Measuring Sensor and Digital Circuit." Wireless Communications and Mobile Computing 2023 (May 2, 2023): 1–10. http://dx.doi.org/10.1155/2023/7136290.
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In combat sports, the team members take attack and defense as the core of sports, and the technical movements are not periodic and the application process is irregular. During the competition, observe the opponent’s neutral position, judge timely, and react quickly. At the same time, athletes are required not only to master skilled technical movements but also to have rapid and accurate adaptability. In order to improve athletes’ rapid response ability, according to the rapid response training scheme, a combat response training tester based on a force-measuring intelligent sensor and digital circuit is designed to improve the athletes’ response ability. Firstly, a comprehensive test system of combat trainer is designed based on the intelligent force-measuring sensor and MSP430, which can measure the response time, speed, and strength of boxing. Secondly, a wavelet filtering algorithm is used to filter the sensor measurement data. Finally, the striking force and striking time of each action are recorded by sensors and data acquisition devices to reflect the striking effect and reflect the “accurate” objectives of the project characteristics. Based on the noninterference and anti-interference of e-touch piezoelectric film, it can be made into universal force-measuring sensors of different specifications for fight competitions according to needs. After being connected into a module network in parallel, it can be connected with the microcontroller to determine the hit area. In addition, the team reaction training test device has laid a foundation for the scientific evaluation of improving the team members’ reaction ability and attack defense conversion ability. The launch of the comprehensive ability tester for combat athletes introduces the previous fuzzy evaluation of athletes’ comprehensive ability into a new way of scientific quantitative measurement and evaluation, which will provide a scientific basis for the selection of combat vibration items, the regulation of training process, the inspection of training effect, and the formulation of enrollment and examination standards for sports colleges and universities. The results show that the instrument can obtain the parameters of hitting strength, strength endurance, hitting speed, speed endurance, hitting impulse, and hitting power of sports biomechanics on the group of fighting events, which provides a reliable basis for coaches to implement teaching and training for athletes.
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Adams, Jose A., Arkady Uryash, and Jose R. Lopez. "Non-Invasive Pulsatile Shear Stress Modifies Endothelial Activation; A Narrative Review." Biomedicines 10, no. 12 (2022): 3050. http://dx.doi.org/10.3390/biomedicines10123050.
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The monolayer of cells that line both the heart and the entire vasculature is the endothelial cell (EC). These cells respond to external and internal signals, producing a wide array of primary or secondary messengers involved in coagulation, vascular tone, inflammation, and cell-to-cell signaling. Endothelial cell activation is the process by which EC changes from a quiescent cell phenotype, which maintains cellular integrity, antithrombotic, and anti-inflammatory properties, to a phenotype that is prothrombotic, pro-inflammatory, and permeable, in addition to repair and leukocyte trafficking at the site of injury or infection. Pathological activation of EC leads to increased vascular permeability, thrombosis, and an uncontrolled inflammatory response that leads to endothelial dysfunction. This pathological activation can be observed during ischemia reperfusion injury (IRI) and sepsis. Shear stress (SS) and pulsatile shear stress (PSS) are produced by mechanical frictional forces of blood flow and contraction of the heart, respectively, and are well-known mechanical signals that affect EC function, morphology, and gene expression. PSS promotes EC homeostasis and cardiovascular health. The archetype of inducing PSS is exercise (i.e., jogging, which introduces pulsations to the body as a function of the foot striking the pavement), or mechanical devices which induce external pulsations to the body (Enhanced External Pulsation (EECP), Whole-body vibration (WBV), and Whole-body periodic acceleration (WBPA aka pGz)). The purpose of this narrative review is to focus on the aforementioned noninvasive methods to increase PSS, review how each of these modify specific diseases that have been shown to induce endothelial activation and microcirculatory dysfunction (Ischemia reperfusion injury-myocardial infarction and cardiac arrest and resuscitation), sepsis, and lipopolysaccharide-induced sepsis syndrome (LPS)), and review current evidence and insight into how each may modify endothelial activation and how these may be beneficial in the acute and chronic setting of endothelial activation and microvascular dysfunction.
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LIU Xuming, ZHA Kuifan, MA Shuai, et al. "A high-capacity 1 K cryogenic system pre-cooled by a pulse tube cryocooler." Acta Physica Sinica 74, no. 11 (2025): 0. https://doi.org/10.7498/aps.74.20250181.
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The 1 K cryogenic system can provide a stable and necessary low-temperature environment for some fields such as quantum computing, condensed matter physics research, and cryogenic scientific instruments. Specifically, in the field of basic research, 1 K is an ideal condition for studying quantum phenomena in low-temperature physics (such as quantum Hall effect, topological phase transition, etc.); in the field of technical applications, 1 K is a necessary condition for some quantum devices (such as superconducting quantum interferometers, single-photon detectors, etc.) to achieve high-sensitivity operation; in the field of ultra-low temperature technology, 1 K is the pre-cooling stage of refrigeration technologies such as dilution refrigerators, and is the basis for further achieving mK temperature ranges and lower temperatures. At present, most domestic 1 K systems use GM cryocoolers for pre-cooling. The system has certain difficulties in achieving lower vibration control, lower electrical noise interference, lower pre-cooling temperature and higher liquefaction efficiency. The 1 K systems based on pulse tube cryocoolers pre-cooling have inherent advantages in solving these problems. This paper first developed a 4 K GM-type pulse tube cryocooler, using a domestic helium compressor and a developed rotary valve, and redesigned the cold-end heat exchanger and the room-temperature phase shifters, achieving a minimum cooling temperature of 2.14 K, and providing 1.5 W@4.2 K and 45 W@45 K cooling capacity simultaneously. Based on the self-developed pulse tube cryocooler as the pre-cooling stage, a 1 K cryogenic system was further constructed. By designing key components such as JT flow resistance, combined thermal switch, and anti-superflow structure, a minimum cooling temperature of 1.1 K was obtained, and a cooling capacity of 100 mW can be provided at 1.6 K. This study has laid an important foundation for the subsequent development of dilution refrigerators with larger cooling capacity.
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Liu, Jing, and Hao Lin Li. "Vibration Simulation of Roll Grinder Measuring Device Based on ADAMS/Vibration." Advanced Materials Research 466-467 (February 2012): 1227–31. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.1227.
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Research on the vibration performance of the grinder measuring device and its anti-vibration ability is very important to improve the measuring and grinding accuracy of the roll grinder. According to the problems of real vibration test difficulty and too many unknown parameters for theoretical analysis, a method of integrating theoretical analysis and simulation test is put forward. A vibration analysis virtual prototype of the measuring device is built using ADAMS/Vibration, and then the system natural frequencies, mode shapes and frequency response are solved to conduct free vibration analysis, providing the base for the design and optimization of the measuring device.
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Lin, Chi-Chang, and Jer-Fu Wang. "Anti-seismic device with vibration-reducing units arranged in parallel." Journal of the Acoustical Society of America 124, no. 2 (2008): 704. http://dx.doi.org/10.1121/1.2969615.
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Du, Yong Feng, Yan Hui Liu, and Hui Li. "Anti-Overturning Control of a Serially Connected Isolation System Using Piezo Electric and MR Tube Support." Advances in Science and Technology 56 (September 2008): 231–36. http://dx.doi.org/10.4028/www.scientific.net/ast.56.231.
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This paper presents a numerical simulation of anti-overturning control of serially connected isolation system using an imagined novel device by combining piezo electric foot and MR tube support. In the vibration isolation of a serially connected electric device which is a real project and was installed on an overhead frame, overturning was observed as a determinant failure mode. To counter for this overturning problem, several additional bolts were used in the isolation layer which decreased the isolation effect. This paper further proposed a semi-active solution using a device for providing anti-overturning moment without increasing the seismic response of the superstructure. This paper presents the idea of the control device set-up and provides a vibration control algorithm, as well the range of validity of parameters of the plant.