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Zeitschriftenartikel zum Thema „Vibration continue“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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1

Abbas, Abbas Fadhil, and Adawiya Ali Hamzah. "Studying the Thermal Influence on the Vibration of Rotating Blades." Measurement Science Review 22, no. 2 (2022): 65–72. http://dx.doi.org/10.2478/msr-2022-0008.

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Abstract Computing the vibrating characteristics of any machine or structure is a necessary process that should be performed by the mechanical engineers that work in engineering design field to avoid the collapse under different kinds of applied loads. One of these kinds of structures are the rotating blades, whereas this part is considered as an essential element in many rotating systems that are used in different fields of engineering, e.g., turbomachinery, turbofan, helicopters, etc. One of the biggest disadvantages that is realized in rotating blades is failure due to vibrations and unbala

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Ren, Fushen, Baojin Wang, and Suli Chen. "Nonlinear Modeling and Qualitative Analysis of Coupled Vibrations in a Drill String." International Journal of Bifurcation and Chaos 28, no. 10 (2018): 1850119. http://dx.doi.org/10.1142/s0218127418501195.

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A coupled model for axial/torsional/lateral vibrations of the drill string is presented, in which the nonlinear dynamics and qualitative analysis method are employed to find out the key factors and sensitive zone for coupled vibration. The drill string is simplified as an equivalent shell under axial rotation. After dimensionless processing, the mathematical model for coupled axial/torsional/lateral vibrations of the drill string is obtained. The Runge–Kutta–Fehlberg method is employed for the numerical simulation, and the rules that govern the changing of the torsional and axial excitation ar

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Wi, Daehan, and Angela A. Sodemann. "Exploring User Perception Challenges in Vibrotactile Haptic Display Using Resonant Microbeams under Contact with Skin." Multimodal Technologies and Interaction 3, no. 2 (2019): 38. http://dx.doi.org/10.3390/mti3020038.

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Resonant vibrotactile microbeams use the concept of resonance to excite the vibration of cantilever beams, which correspond to pixels of an image. The primary benefit of this type of tactile display is its potential for high resolution. This paper presents the concept of the proposed system and human skin contact experiments to explore user perception challenges related to beam vibration during skin contact. The human skin contact experiments can be described in five phases: dried skin contact to metal beam tips, wet and soaped skin contact to metal beam tips, skin contact with a constraint, n

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Pathak, Prabhat, Jeongin Moon, Se-gon Roh, Changhyun Roh, Youngbo Shim, and Jooeun Ahn. "Application of vibration to the soles reduces minimum toe clearance variability during walking." PLOS ONE 17, no. 1 (2022): e0261732. http://dx.doi.org/10.1371/journal.pone.0261732.

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Minimum toe clearance (MTC) is an important indicator of the risk of tripping. Aging and neuromuscular diseases often decrease MTC height and increase its variability, leading to a higher risk of tripping. Previous studies have developed visual feedback-based gait training systems to modify MTC. However, these systems are bulky and expensive, and the effects of the training continue only for a short time. We paid attention to the efficacy of vibration in decreasing the variability of gait parameters, and hypothesized that proper vibration applied to soles can reduce the MTC variability. Using

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Liu, Jiantao, and Xiaoxiang Yang. "Learning to See the Vibration: A Neural Network for Vibration Frequency Prediction." Sensors 18, no. 8 (2018): 2530. http://dx.doi.org/10.3390/s18082530.

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Vibration measurement serves as the basis for various engineering practices such as natural frequency or resonant frequency estimation. As image acquisition devices become cheaper and faster, vibration measurement and frequency estimation through image sequence analysis continue to receive increasing attention. In the conventional photogrammetry and optical methods of frequency measurement, vibration signals are first extracted before implementing the vibration frequency analysis algorithm. In this work, we demonstrate that frequency prediction can be achieved using a single feed-forward convo

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Hale, Michael, and Jesse Porter. "Validation Techniques for 6-DOF Vibration Data Acquisition." Journal of the IEST 55, no. 1 (2012): 10–24. http://dx.doi.org/10.17764/jiet.55.1.27662m34h12v32p6.

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Multiple Degree of Freedom (MDOF) excitation systems and MDOF vibration control systems continue to improve, and are now standard equipment in many dynamic test laboratories. Determination of an input specification for such MDOF systems is critically dependent on properly acquired field data. Validation of field data will be discussed and demonstrated employing the same transformation tools used in both transformation-based 6-degree-of-freedom (6-DOF) vibration control and generalized MDOF vibration specification development (VSD).

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Hale, Michael. "A 6-DOF Vibration Specification Development Methodology." Journal of the IEST 54, no. 2 (2011): 103–15. http://dx.doi.org/10.17764/jiet.54.2.j6tr2r787846931n.

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Multiple degree of freedom (MDOF) excitation systems and MDOF vibration control systems continue to improve, and are now standard equipment in many dynamic test laboratories. This paper concentrates on the often overlooked process of determination of an input specification for such MDOF systems. A pair of generalized six-degree-of-freedom (6-DOF) vibration specification development (VSD) techniques are proposed, discussed, and illustrated through an example.

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Younis, Adel, Fadi AlKhatib, and Zuomin Dong. "Optimal Motorcycle Engine Mount Design Parameter Identification Using Robust Optimization Algorithms." Algorithms 15, no. 8 (2022): 271. http://dx.doi.org/10.3390/a15080271.

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Mechanical vibrations have a significant impact on ride comfort; the driver is constantly distracted as a result. Volumetric engine inertial unbalances and road profile irregularities create mechanical vibrations. The purpose of this study is to employ optimization algorithms to identify structural elements that contribute to vibration propagation and to provide optimal solutions for reducing structural vibrations induced by engine unbalance and/or road abnormalities in a motorcycle. The powertrain assembly, swing-arm assembly, and vibration-isolating mounts make up the vibration-isolating sys

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Wei, Shuang. "Research on wind resistance principles and design of super high-rise buildings." Applied and Computational Engineering 62, no. 1 (2024): 7–14. http://dx.doi.org/10.54254/2755-2721/62/20240371.

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Due to the high and flexible characteristics of super high-rise buildings, the structure is very sensitive to wind loads, and wind vibration effects and comfort are issues that cannot be ignored in the structural design of super high-rise buildings. The paper mainly introduces the problems in wind resistance design of super high-rise buildings. Including wind load values, wind vibration effects, and vibration control methods and applications. The result show that the wind induced vibration effect and comfort of the structure are often determined through wind tunnel tests. For super high-rise b

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Matsuda, Toru, and Ryuta Tomita. "Study on vibration measurement and sensory evaluation of combined vibration for detached houses." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 8 (2023): 904–13. http://dx.doi.org/10.3397/in_2023_0143.

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Sensory and psychological content accounts for 90% of all vibration complaints in Japan. Therefore, evaluation based on vibration sensation is very important. Traffic vibration is the most common source of vibration that causes complaints, when limited to detached houses. If traffic vibration is the source of complaints, occupants will suffer from vibration for a long period of time. Vibration transmitted by traffic to housing floors may not be either vertical or horizontal, but rather a combination of both vertical and horizontal vibration that exceed perceptual thresholds. Japanese standards

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Bloomfield, Eli, and Muhammad Salman. "Numerical investigation on the effects of wake-induced vibration fluid flow over airfoil geometries." Journal of the Acoustical Society of America 152, no. 4 (2022): A233. http://dx.doi.org/10.1121/10.0016117.

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Currently, many companies are looking to innovate and decrease economic and environmental impacts in the aerospace, energy, and marine sectors. As companies continue to innovate, airfoil designs used in the aerospace, wind turbine, commercial, and military marine industries, the lighter materials used are more susceptible to fatiguing failures due to vibrations. When these geometries encounter unsteady flow, the airfoil creates a vibration response. If the vibration response is near the natural frequency of the airfoil geometry, catastrophic failure can occur. This paper analyzes the correlati

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Zhao, Long Sheng, and Jin Wu Wu. "Natural Frequency and Vibration Modal Analysis of Composite Laminated Plate." Advanced Materials Research 711 (June 2013): 396–400. http://dx.doi.org/10.4028/www.scientific.net/amr.711.396.

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In this paper,a layer-wise theory is used to analyze the natural frequency and vibration modal of the composite laminated plate. Layer-wise theory assumes that displacement is continue through thickness direction and has good accuracy to analyze free vibration. The frequency and vibration modal are acquired while building the equation of motion according to layer-wise theory. Through comparing layer-wise theory and other theories, numerical results show that layer-wise theory is credible to analyze composite laminated plate. At the same time, experiment is used in this paper to acquire the nat

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Vallejo, Marcela, Francisco Luis Villa-Restrepo, Cherlly Sánchez-González, and Edilson Delgado-Trejos. "Metrological Advantages of Applying Vibration Analysis to Pipelines: A Review." Scientia et Technica 26, no. 1 (2021): 28–35. http://dx.doi.org/10.22517/23447214.24351.

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Flow rate is a necessary variable in industrial processes and, therefore, there is a wide variety of instruments designed to measure it. However, the most accepted measuring devices have the problem of being invasive or intrusive. The scientific and technological challenge is to achieve measurement by exploiting all the phenomenological possibilities using a non-intrusive, easy-to-install, portable and low-cost mechanism. This paper presents a literature review on the use of vibration analysis in flow rate metrological systems in order to identify research opportunities for the indirect measur

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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 issu

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Zheng, Gong Ming, Yuan Yuan Shen, and Ling Ling Song. "Vibroseis Nonlinear Scanning Signal Simulation Analysis." Applied Mechanics and Materials 318 (May 2013): 191–95. http://dx.doi.org/10.4028/www.scientific.net/amm.318.191.

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Vibrator nonlinear scan is an important means of high frequency seismic exploration. With the propagation of seismic waves, High frequency components continue to be absorbed, due to the filtering effect of the earth. Nonlinear scanning technology can get some degree of compensation to the seismic wave loss in the high frequency part in the propagation, by extending the vibration of the high frequency component time. This article through MATLAB simulation, this paper analyzed the nonlinear scanning signals in scanning signals and logarithmic index scanning signals, and the similarities and diff

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Melentev, Andrey V., and Oleg A. Oshkoderov. "Assessment of the diagnostic significance of modern biomarkers and hemodynamic alterations in workers of vibration-hazardous occupations." HEALTH CARE OF THE RUSSIAN FEDERATION 65, no. 4 (2021): 379–83. http://dx.doi.org/10.47470/0044-197x-2021-65-4-379-383.

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Introduction. One of the most significant tasks in modern labor medicine is to reduce the indicators of early disability in persons in contact with harmful and dangerous factors of the production environment. The issue of finding markers of early preclinical manifestations of vibrational disease and establishing comorbid conditions that are prognostically unfavorable for the course of the underlying occupational disease remains relevant. The purpose of the study is assessment of diagnostic significance of current neurospecific biomarkers and hemodynamic changes in workers of the profession rel

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Kernytskyy, Ivan, Serhii Baranovych, Serhii Berezovetskyi, Bohdan Diveyev, Orest Horbay, and Ihor Stukalets. "Vibration absorber optimization for boom-sprayer." Przegląd Naukowy Inżynieria i Kształtowanie Środowiska 27, no. 4 (2019): 504–15. http://dx.doi.org/10.22630/pniks.2018.27.4.47.

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The main task of this work is to analyze optimal design-system of the booms of boom-sprayers. The discrete-continue models of machines dynamics of such wheeled machines as boom-sprayer with elongated boom element with the attachment of dynamic vibration absorbers are offered. The algorithms for vibration decreasing of boom are received. The new vibroabsorbing elements are proposed. The paper contemplates the provision of dynamic vibration absorbers (DVA) of buffered impact masses and particle type. Such originally designed absorbers reduce vibration selectively in maximum vibration mode, witho

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18

Ferri, A. A. "Friction Damping and Isolation Systems." Journal of Mechanical Design 117, B (1995): 196–206. http://dx.doi.org/10.1115/1.2836456.

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This paper surveys the literature on the use of dry friction in passive damping and vibration isolation. Several analytical techniques are presented followed by applications from various areas. Despite difficulties in the analytical and experimental treatment of friction damped systems, numerous studies have endeavored to predict, measure, and/or enhance the energy dissipation and vibration isolation properties of dry friction in order to improve system performance. Undoubtedly, friction damping will continue to play an important role in many mechanical and structural systems.

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Ferri, A. A. "Friction Damping and Isolation Systems." Journal of Vibration and Acoustics 117, B (1995): 196–206. http://dx.doi.org/10.1115/1.2838663.

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This paper surveys the literature on the use of dry friction in passive damping and vibration isolation. Several analytical techniques are presented followed by applications from various areas. Despite difficulties in the analytical and experimental treatment of friction damped systems, numerous studies have endeavored to predict, measure, and/or enhance the energy dissipation and vibration isolation properties of dry friction in order to improve system performance. Undoubtedly, friction damping will continue to play an important role in many mechanical and structural systems.

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Zahedinejad, Parham, Chen Zhang, Haifeng Zhang, and Shuai Ju. "A Comprehensive Review on Vibration Analysis of Functionally Graded Beams." International Journal of Structural Stability and Dynamics 20, no. 04 (2020): 2030002. http://dx.doi.org/10.1142/s0219455420300025.

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Beams and beam structures are structural components commonly used in mechanical, aerospace, nuclear, and civil engineering. To meet the different engineering design limitations such as operational conditions, weight, and vibrational characteristics, these components may be made of various materials such as functionally-graded materials (FGMs), composites, and homogeneous materials. Functionally-graded (FG) beams play a key role not only in classical structural applications, but also have vast applications in thermal, electric-structural and electric-thermal-structural systems, e.g. in the form

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Lee, Hsin-Min, and Tzung-Ming Chen. "A Study of Polishing Feature of Ultrasonic-Assisted Vibration Method in Bamboo Charcoal." Advances in Materials Science and Engineering 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/6750467.

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Focusing on the feature of porosity in bamboo charcoal, this study applies the ultrasonic-assisted vibration method to perform surface polishing of the silicon wafer workpiece. The self-developed bamboo charcoal polishing spindle and ultrasonic- assisted vibration mechanism are attached to a single lapping machine. In the machining process, ultrasonic vibration enables the diamond slurry to smoothly pass through the microscopic holes of bamboo charcoal; the end of the bamboo charcoalis able to continue machining on the surface of the workpiece through the grasping force which exists in the mic

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Syurin, Sergey A., and V. V. Shilov. "The characteristics of vibration disease of miners in conditions of modern technologies of mining ore raw materials in the Kola High North." Health Care of the Russian Federation 60, no. 6 (2019): 312–16. http://dx.doi.org/10.18821/0044-197x-2016-60-6-312-316.

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The study was carried out to analyze characteristics of development of vibration disease in miners of mineral resources' industry enterprises of the Kola High North in 1989-2013. Altogether, in miners of 16 professions 509 cases of primarily diagnosed vibration disease were established that amounted to 22.5% of all cases of occupational diseases. The vibration disease ranked second place in the structure of occupational pathology after diseases of musculo-skeletal system. During the analyzed period, the following characteristics of vibration pathology were established: 1. significant increasin

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Ayad, Mouloud, Kamel Saoudi, Mohamed Rezki, Mourad Benziane, and Abderrazak Arabi. "Early Detection of Defects in Gear Systems Using Autocorrelation of Morlet Wavelet Transforms." Strojniški vestnik - Journal of Mechanical Engineering 68, no. 1 (2022): 56–65. http://dx.doi.org/10.5545/sv-jme.2021.7384.

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The supervision task of industrial systems is vital, and the prediction of damage avoids many problems. If any system defects are not detected in the early stage, this system will continue to degrade, which may cause serious economic loss. In industrial systems, the defects change the behaviour and characteristics of the vibration signal. This change is the signature of the presence of the defect. The challenge is the early detection of this signature. The difficulty of the vibration signal is that the signal is very noisy, non-stationary and non-linear. In this study, a new method for the ear

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Li, Lin, Yuanshan Yang, Weixin Xu, et al. "Advances in the Multiphase Vortex-Induced Vibration Detection Method and Its Vital Technology for Sustainable Industrial Production." Applied Sciences 12, no. 17 (2022): 8538. http://dx.doi.org/10.3390/app12178538.

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Fluid-induced vibration detection technology for the multiphase sink vortex can help achieve efficient, safe, and low-carbon sustainable industrial production in various areas such as the marine, aerospace, and metallurgy industries. This paper systematically describes the basic principles and research status in light of the important issues related to this technology in recent years. The primary issues that occur in practical application are highlighted. The vital technologies involved, such as the vortex-formation mechanism, interface dynamic evolution, the shock vibration response of thin-w

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Hu, Jianyong, Chaohao Wang, Chengju Shan, and Yunhui Guo. "Monitoring and Analysis of the Operation Performance of Vertical Centrifugal Variable Frequency Pump in Water Supply System." Energies 16, no. 11 (2023): 4526. http://dx.doi.org/10.3390/en16114526.

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The stable operation of a variable frequency pump is of great importance to the management of a water supply project. Analyzing the operation performance based on monitoring data is necessary for maintaining the stable operation of a variable frequency pump. Several sensors are installed at six monitoring points on the pump to collect signals including vibration velocity, vibration acceleration and vibration displacement. Monitoring signals are preprocessed by smoothing, adjusting waveform trend and filtering on the basis of Fast Fourier Transform (FFT). Then, the vibration features are extrac

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Pujari, Amit N., Richard D. Neilson, and Marco Cardinale. "Fatiguing effects of indirect vibration stimulation in upper limb muscles: pre, post and during isometric contractions superimposed on upper limb vibration." Royal Society Open Science 6, no. 10 (2019): 190019. http://dx.doi.org/10.1098/rsos.190019.

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Whole-body vibration and upper limb vibration (ULV) continue to gain popularity as exercise intervention for rehabilitation and sports applications. However, the fatiguing effects of indirect vibration stimulation are not yet fully understood. We investigated the effects of ULV stimulation superimposed on fatiguing isometric contractions using a purpose developed upper limb stimulation device. Thirteen healthy volunteers were exposed to both ULV superimposed to fatiguing isometric contractions (V) and isometric contractions alone Control (C). Both Vibration (V) and Control (C) exercises were p

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Gu, Zhaoliang, Wenbing Zhu, Mengzhao Zhu, et al. "Gas Production Characteristics of UHV Oil immersed Shunt Reactor with Vibration Defects." Journal of Physics: Conference Series 2564, no. 1 (2023): 012052. http://dx.doi.org/10.1088/1742-6596/2564/1/012052.

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Abstract The special multi-air gap structure of Ultra high voltage (UHV) oil-immersed shunt reactor determines that its magnetic leakage is far greater than that of a power transformer of the same voltage level, and it is more prone to vibration and other problems. Overheating and suspended discharge caused by vibration are important sources of excessive gas production in UHV shunt reactors. In this paper, the source of gas production under reactor vibration is analyzed, and a reactor defect simulation gas production platform is built. Using oil chromatography analysis, partial discharge detec

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Lomboy, Orlando Ariola, Bernard Ablog De Vera, Maria Eden Cada Adona-Pizarro, and Eleoreph Sarmiento Llabado. "Harnessing vibration energy from a rice-milling machine." South Florida Journal of Development 3, no. 3 (2022): 3736–54. http://dx.doi.org/10.46932/sfjdv3n3-055.

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In the advent of a rat race for the exploration of alternative source of power, clean and green source of electrical power is deemed to be an extreme priority. Various groups of people, professionals and even students with wide spectrum of discipline untiringly continue to source-out electricity out of their own exploration capabilities. This study had focused on the extraction and conversion of a vibration energy from a moving strainer mechanism of a rice-milling machine. The researchers of this project undertaking were able to successfully fabricate a prototype that can extract the vibration

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Park, Sang, Myunghwan Jung, and Joo Sung. "Influence of Physical and Musculoskeletal Factors on Occupational Injuries and Accidents in Korean Workers Based on Gender and Company Size." International Journal of Environmental Research and Public Health 16, no. 3 (2019): 345. http://dx.doi.org/10.3390/ijerph16030345.

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Though the overall incidence of occupational injuries and accidents has decreased, they continue to happen. Many associated factors are known and managing them with limited resources is difficult. This study evaluates related risk factors and prioritizes their management for reducing occupational injuries and accidents at the workplace. We used data from the 4th Korean Working Condition Survey conducted by the Korea Occupational Safety Health Research Institute from June to September 2014. A total of 14,381 persons (9776 men, 4605 women) were selected; t-test, chi-square test, and logistic reg

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Meng, Xiang Ran, Yu Zhao, Xiao Qian Wang, Peng Fei Xu, Wen Dong Zhang, and Shu Bin Yan. "The Effect of Vibration Noise for Cavity Ring Down Time Extraction." Key Engineering Materials 562-565 (July 2013): 1402–7. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.1402.

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A continue-wave cavity ring down experimental system is established surrounding the micro-sphere cavity. In the experiments of measuring micro-spheres cavity quality factor (Q) upon the system, it is found that photoelectric detectors with different response characteristic have different response to the optical signal which is shut off rapidly. The vibration noise caused by changes of external environment, meanwhile, can be transformed following the change of photoelectric detector properties. With the build of photoelectric detector response model, the mean-square deviation of repeated experi

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Gamar, Farida, Rusdhianto Effendie Abdul Kadir, and Achmad Jazidie. "Desain kontrol adaptif L1 dengan band pass filter orde dua untuk pengendali vibrasi pada rotor helikopter." JURNAL ELTEK 21, no. 1 (2023): 1–9. http://dx.doi.org/10.33795/eltek.v21i1.380.

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Vibrasi pada helikopter menjadi konsentrasi tersendiri untuk terus ditingkatkan penanganannya. Hal ini dikarenakan selain dapat menyebabkan kerusakan struktur badan helikopter jika vibrasi yang dihasilkan terlalu besar juga berpengaruh pada kenyamanan pilot dan penumpang. Sistem vibrasi pada helicopter terdiri dari baling-baling, rotor mount, dan suspensi dimana terdapat damper sebagai peredam. Pada penelitian ini, digunakan damper semi aktif yang variabelnya dikontrol dengan menggunakan kontrol adaptif L1 berbasis analisis Fourier dari vibrasi yang dihasilkan oleh rotor. Analisis Fourier digu

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Sands, William A., Jeni R. McNeal, Michael H. Stone, G. Gregory Haff, and Ann M. Kinser. "Effect of Vibration on Forward Split Flexibility and Pain Perception in Young Male Gymnasts." International Journal of Sports Physiology and Performance 3, no. 4 (2008): 469–81. http://dx.doi.org/10.1123/ijspp.3.4.469.

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Serious stretching in many sports involves discomfort and is often an early ceiling on improvements.Purpose:To continue investigation of the use of vibration to enhance acute range of motion while assessing the influence of vibration and stretching on pressure-to-pain threshold perception.Methods:Ten young male gymnasts were assessed for split range of motion. One side split was randomly assigned as the experimental condition, and the other side split was assigned as the control. Both side splits were performed on a vibration device; the experimental condition had the device turned on and the

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Mironov, Victor, Janis Viba, and Lauris Shtals. "Use of Electromagnetic Impulse System for Transportation of Dry Materials and Solid Bodies." Solid State Phenomena 147-149 (January 2009): 474–79. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.474.

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In first part of the report motion of magnetic powder materials in a vertical or inclined pipe are investigated. Mathematical models are analyzed, taking into account intensity of a pulse electromagnetic field, parameters of a powder and its interaction with the surface of the pipe and air. Experimental device, including control and measure system with the analysis of parameters by computer, is described. Second part of the report investigates a motion of non-magnetic materials. For this reason an additional magnetic container with open surface is used. After an impulse action the container st

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Hawryszków, Paweł, Roberto Pimentel, Rafaela Silva, and Felipe Silva. "Vertical Vibrations of Footbridges Due to Group Loading: Effect of Pedestrian–Structure Interaction." Applied Sciences 11, no. 4 (2021): 1355. http://dx.doi.org/10.3390/app11041355.

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The vibration serviceability of footbridges has evolved from the adoption of a single pedestrian crossing in the resonance condition to load cases in which several pedestrians cross the structure simultaneously. However, in spite of this improvement, pedestrians continue to be considered as applied loads in codes of practice. Recent research has pointed out that modeling pedestrians as dynamic systems is a step further in the search for a more realistic design approach. This is explored in this paper, focusing on the case of vertical vibration. A two-span cable-stayed test structure was select

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Widodo, Panut, Gunawan Dwi Haryadi, and Achmad Widodo. "Induction Motor Centrifugal Blower Health Diagnostic Based on Color Segmentation of Thermal Image and Vibration Signal Feature." MATEC Web of Conferences 159 (2018): 02002. http://dx.doi.org/10.1051/matecconf/201815902002.

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The rotating machinery requires condition monitoring which its measurement without being intrusive operation, especially on the equipment needed to continue running. One such machinery is a centrifugal blower induction motor. Infrared thermography and vibration are important and effective technologies to diagnose of health condition it without destructive or disturb of operations. The diagnostics of induction motor are based on the analysis results data onto vibration and processing thermal image. This paper focused on thermography image processing based on color segmentation which it will pro

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Zhai, Changyuan, John Long, Randal Taylor, Paul Weckler, and Ning Wang. "Field scale row unit vibration affecting planting quality." Precision Agriculture 21, no. 3 (2019): 589–602. http://dx.doi.org/10.1007/s11119-019-09684-4.

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Abstract With recent developments allowing increased planter speeds, improving spatial uniformity of crop emergence will continue to be an important focus of research. Vertical vibration during planting usually interferes with the seed metering and delivery process, and thereby affects seeding quality. Two different row crop planters were instrumented with accelerometers to monitor vertical vibration of planter row units in five fields with a total area of 220 ha in both no-till and strip-tilled conditions. The test results showed that the row unit vibration linearly increased with planting sp

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Ku, C. P. Roger. "Dynamic Characteristics of Hard Disk Drive Spindle Motors—Comparison Between Ball Bearings and Hydrodynamic Bearings." Journal of Tribology 118, no. 2 (1996): 402–6. http://dx.doi.org/10.1115/1.2831316.

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Recently, many computer hard disk drive companies and spindle motor manufacturers have been looking for a substitute for ball bearings to continue making dramatic progress in increasing the capacity of data storage systems. In this paper, the frequency-forced responses of hard disk drive spindle motors supported by both ball bearings and liquid-lubricated spiral groove hearings (SGBs) were studied experimentally. It is found that both shaft rigidity and disk flexibility have great effects on the natural frequency of the spindle motor conical (rocking) mode. The high damping capacity of the SGB

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Mao, Qibo, and Stanislaw Pietrzko. "Active Control of a Beam for Generating Points of Zero Displacements and Zero Slopes." Solid State Phenomena 147-149 (January 2009): 861–68. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.861.

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Piezoelectric transducers have been used extensively as the distributed actuators and sensors in active control of structural vibrations. Piezoelectric actuator/sensors are distributively bonded on or embedded in the host structure and have the inherent advantage of integrating over their surface area, which leads to potentially more robust implementations as compared to implementations that use shaker/accelerometers. For this reason piezoelectric actuator/sensors have attracted more and more attention in recent years. In this paper, a theoretical analysis is presented of the active control of

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Wright, Andrew, and Amanda Nolen. "An observational protocol to measure learning in a problem-based learning vibrations course." Journal of the Acoustical Society of America 151, no. 4 (2022): A82. http://dx.doi.org/10.1121/10.0010727.

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We have incorporated problem-based learning into several courses in an undergraduate engineering curriculum, including dynamics and vibrations. Students' prior knowledge (both formal and informal) were assessed through concept inventories to determine what prior knowledge supported or impeded the acquisition of new content in these courses. A point-and-click classroom observation tool was developed and refined over the span of two consecutive academic semesters to capture the students' interactions as they engaged in authentic learning activities in engineering. We identified patterns of disco

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Marin-Puyalto, Jorge, Alba Gomez-Cabello, Alejandro Gonzalez-Aguero, et al. "Effects of whole-body vibration training on bone density and turnover markers in adolescent swimmers." Journal of Pediatric Endocrinology and Metabolism 33, no. 5 (2020): 623–30. http://dx.doi.org/10.1515/jpem-2019-0400.

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AbstractBackgroundWhole-body vibration training has recently been proposed as a complementary training modality to improve the bone health of adolescent swimmers. However, there is no longitudinal study regarding the effects of this training combination on bone metabolism. Therefore, the main goal was to analyze the effects of swimming and vibration training on bone turnover markers during adolescence.MethodsThe present study included 68 adolescent swimmers and 41 normoactive controls (CON). Swimmers were randomly selected to either continue with their regular swimming training (SWI) or partic

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GOVARDHAN, R., and C. H. K. WILLIAMSON. "Modes of vortex formation and frequency response of a freely vibrating cylinder." Journal of Fluid Mechanics 420 (October 10, 2000): 85–130. http://dx.doi.org/10.1017/s0022112000001233.

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In this paper, we study the transverse vortex-induced vibrations of an elastically mounted rigid cylinder in a fluid flow. We use simultaneous force, displacement and vorticity measurements (using DPIV) for the first time in free vibrations. There exist two distinct types of response in such systems, depending on whether one has a high or low combined mass–damping parameter (m*ζ). In the classical high-(m*ζ) case, an ‘initial’ and ‘lower’ amplitude branch are separated by a discontinuous mode transition, whereas in the case of low (m*ζ), a further higher-amplitude ‘upper’ branch of response ap

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Chorney, Stephen R., Jennifer A. Villwock, and Amar C. Suryadevara. "Vibration Versus Ice to Reduce Cosmetic Botulinum Toxin Injection Pain—A Randomized Controlled Trial." Ear, Nose & Throat Journal 98, no. 6 (2019): 351–55. http://dx.doi.org/10.1177/0145561319839839.

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Botulinum toxin is the most commonly performed facial cosmetic procedure and pain at the injection site is a frequent patient concern. While various topical interventions have been described for analgesia, there have not been any studies comparing different techniques. We compared the use of a vibratory stimulus, ice pack application, and no intervention on injection site pain for cosmetic botulinum toxin injection. A prospective-, randomized-, individual-controlled study was conducted using a visual analog scale to assess pain. Patients received bilateral glabellar injections, with randomizat

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Ding, Huaping, Qinghong Shen, and Sidan Du. "Autonomous main-cable vibration monitoring using wireless smart sensors for large-scale three-pylon suspension bridges: A case study." Journal of Low Frequency Noise, Vibration and Active Control 39, no. 3 (2018): 604–15. http://dx.doi.org/10.1177/1461348418813760.

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Suspension bridges are supported by main cables that continue beyond the pillars to deck-level supports and must be anchored at each end of the bridge. The dynamic characteristics of the main cables are key indicators used to assess the structural health status of a bridge. In situ real-time health monitoring is an effective way to assess the dynamic characteristics. This paper presents a case study using vibration-based wireless smart sensors deployed on the main cables of a large-scale three-pylon suspension bridge to obtain its dynamic features. The methods of anti-aliasing filtering, stati

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Zawieska, Wiktor, and Dariusz Pleban. "Preventing Noise and Vibration During the 60 Years of Activity of the Central Institute for Labour Protection - National Research Institute." Archives of Acoustics 36, no. 1 (2011): 161–71. http://dx.doi.org/10.2478/v10168-011-0013-0.

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Abstract In 2010, the Central Institute for Labour Protection - National Research Institute celebrated the 60th anniversary of its activity. Primary objectives of the Institute have been and continue to be the protection of employees against any hazards at work stations. Among the numerous hazards, vibroacoustic ones are becoming prevailing. Therefore, one can now dare to say that the 60 years of activity of the Central Institute for Labour Protection have also meant 60 years of preventing noise and vibration in the working environment. For those 60 years of activity, Central Institute for Lab

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Dai, Yang, and Chao Ye. "Influence of Wheel Polygons on Dynamic Performance of Trains." Academic Journal of Science and Technology 5, no. 2 (2023): 27–31. http://dx.doi.org/10.54097/ajst.v5i2.5928.

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With the continuous development of high-speed railroad technology, the operating speed and mileage of moving trains continue to increase, and the phenomenon of wheel-rail contact fatigue and wear is gradually highlighted, and the problem of wheel polygon wear is also prevalent in the operating site. Wheel polygon wear will deteriorate the wheel-rail contact relationship, so that the wheel-rail force surge, the safety and stability of the train caused serious impact. Therefore, wheel polygons become a key problem to be solved, but the formation and development mechanism of wheel polygons has no

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Marcinko, Peter, Mikulas Hajduk, and Martin Kočan. "MEASURING CHAIN FOR CHECKING THE VIBRATION OF MECHANICAL PARTS." TECHNICAL SCIENCES AND TECHNOLOGIES, no. 4(18) (2019): 121–26. http://dx.doi.org/10.25140/2411-5363-2019-4(18)-121-126.

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Urgency of the research. Interest in this topic is aroused, because mechanical vibration may damage the machinery or parts of machine. Therefore, it is appropriate to design systems that detect problems. Also these systems can help in the timely replacement of the worn part. Target setting. The main goal is to design a system that can detect in a timely manner a problem that could destroy the device. It is therefore necessary to design systems that can record this. Actual scientific researches and issues analysis. In recent years, there has been an increase in demand for equipment that can det

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Ray, Chase A., and Steven R. Anton. "Multilayer piezoelectret foam stack for vibration energy harvesting." Journal of Intelligent Material Systems and Structures 28, no. 3 (2016): 408–20. http://dx.doi.org/10.1177/1045389x16657420.

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Electronic devices are high-demand commodities in today’s world, and such devices will continue increasing in popularity. Currently, batteries are implemented to provide power to these devices; however, the need for battery replacement, their cost, and the waste associated with battery disposal present a need for advances in self-powered technology. Energy harvesting technology has great potential to alleviate the drawbacks of batteries. In this work, a novel piezoelectret foam material is investigated for low-level vibration energy harvesting. Specifically, piezoelectret foam assembled in a m

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V. Shaha, Gauravkumar, and Vivek S. Chandurkar. "MANAGEMENT OF GRUDHRASI WITH UNIQUE COMBINATION OF AYURVEDIC HERBAL KWATHA & AGNIKARMA." International Journal of Research -GRANTHAALAYAH 5, no. 9 (2017): 224–29. http://dx.doi.org/10.29121/granthaalayah.v5.i9.2017.2235.

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Today people are predisposed to various diseases based on their way of living and occupational habits called life style diseases. Orthopedic disorders are one of the mostly exposed to such life style habits. physical inactivity, wrong body posture, occupational posture, long sitting jobs, stresses activity, exposure to continue vibration, post-operative causes, gym, athletes muscular spasm are main contributing factors to orthopedic disorders. One of the most common orthopedic health problems today is lower back pain which is accompanied most of the time by Sciatica. The present case stu

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Strömbergsson, D., P. Marklund, K. Berglund, and P.-E. Larsson. "Property requirements of vibration measurements in wind turbine drivetrain bearing condition monitoring." Insight - Non-Destructive Testing and Condition Monitoring 63, no. 11 (2021): 667–74. http://dx.doi.org/10.1784/insi.2021.63.11.667.

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Wind turbine drivetrain bearing failures continue to lead to high costs resulting from turbine downtime and maintenance. As the standardised tool to best avoid downtime is online vibration condition monitoring, a lot of research into improving the signal analysis tools of the vibration measurements is currently being performed. However, failures in the main bearing and planetary gears are still going undetected in large numbers. The available field data is limited when it comes to the properties of the stored measurements. Generally, the measurement time and the covered frequency range of the

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Mensa-Wilmot, Graham. "Technology Focus: Bits and Bottomhole Assemblies (December 2020)." Journal of Petroleum Technology 72, no. 12 (2020): 52. http://dx.doi.org/10.2118/1220-0052-jpt.

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Achieving and sustaining performance drilling’s intended benefits - improved drilling efficiency with minimal down-hole tool failures and the associated reductions in project cycle time and operational costs - requires new protocols in drilling-system analysis. Drilling-system components [bits, reamers, bottomhole assemblies (BHAs), drive systems, drilling parameters, and hydraulics] must be analyzed independently for their relevance on the basis of application types and project challenges. Additionally, the drilling system must undergo holistic evaluations to establish functional compatibilit

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