Journal articles: 'Transmissibility'

1

Lage, Y. E., M. M. Neves, N. M. M. Maia, and D. Tcherniak. "Force transmissibility versus displacement transmissibility." Journal of Sound and Vibration 333, no. 22 (October 2014): 5708–22. http://dx.doi.org/10.1016/j.jsv.2014.05.038.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Farrell, Elinor, Imran Mohamed, and Iain J. Robbé. "Transmissibility of Influenza." Epidemiology 23, no. 4 (July 2012): 650. http://dx.doi.org/10.1097/ede.0b013e3182583ff8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Klick, Brendan, Hiroshi Nishiura, and Benjamin J. Cowling. "Transmissibility of Influenza." Epidemiology 23, no. 4 (July 2012): 650–51. http://dx.doi.org/10.1097/ede.0b013e3182590554.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Meusch, John, and Salam Rahmatalla. "3D Transmissibility and Relative Transmissibility of Immobilized Supine Humans during Transportation." Journal of Low Frequency Noise, Vibration and Active Control 33, no. 2 (June 2014): 125–37. http://dx.doi.org/10.1260/0263-0923.33.2.125.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Yang, Rui, Dong-Mei Wang, Ning Liang, and Yan-Feng Guo. "Maximum Vibration Transmissibility of Paper Honeycomb Sandwich Structures." International Journal of Structural Stability and Dynamics 19, no. 06 (June 2019): 1971003. http://dx.doi.org/10.1142/s0219455419710032.

Full text

Abstract:

The maximum vibration transmissibility of paper honeycomb sandwich structures with different sizes of honeycomb core under various static stresses was investigated using the sine frequency sweep test. The effects of the cell length of the honeycomb, the thickness of the sandwich structure, and the static stress on the maximum vibration transmissibility were evaluated and a linear polynomial equation for evaluating the maximum vibration transmissibility was obtained. The results show that the maximum vibration transmissibility increases steadily with the increase in the cell length of the honeycomb, the thickness of the sandwich structure, and the static stress. The proposed equation for the maximum vibration transmissibility is suitable for predicting the maximum vibration transmissibility of paper honeycomb sandwich structures. In addition, the fitted three-dimensional diagrams of the effects of the factors on the maximum vibration transmissibility derived from the evaluation equation were shown to be in good agreement with the experimental results.

APA, Harvard, Vancouver, ISO, and other styles

6

Bonomo, Anthony L., and Matthew Craun. "Direct transmissibility and structural acoustics." Journal of the Acoustical Society of America 150, no. 4 (October 2021): A344. http://dx.doi.org/10.1121/10.0008527.

Full text

Abstract:

Direct transmissibility is a useful concept developed for transfer path analysis of linear systems. Defined loosely as the quotient between the responses at degrees-of-freedom i and j when i is excited and all other degrees of freedom are blocked, the direct transmissibility provides information on the connectivity of a system that more conventional transmissibility quantities cannot. Despite its apparent usefulness, the application of the direct transmissibility concept to structural acoustics has been somewhat limited. In this talk, the definition of direct transmissibility will be reviewed and the utility of this concept will be demonstrated through application to a few canonical structural acoustics systems. The extension of the direct transmissibility concept from spatial to modal coordinates will also be explored. [Work supported by ONR.]

APA, Harvard, Vancouver, ISO, and other styles

7

Dondorp, Harry. "Transmissibility of Delictual Claims." Bulletin of Medieval Canon Law 33, no. 1 (2016): 145–84. http://dx.doi.org/10.1353/bmc.2016.0006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Corsellis, J. A. N. "THE TRANSMISSIBILITY OF DEMENTIA." British Medical Bulletin 42, no. 1 (1986): 111–14. http://dx.doi.org/10.1093/oxfordjournals.bmb.a072090.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Cogswell, James A., and Donald E. Malen. "Low force transmissibility mount." Journal of the Acoustical Society of America 80, no. 5 (November 1986): 1563. http://dx.doi.org/10.1121/1.394337.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Schapira, Allan. "More on Malaria Transmissibility." Parasitology Today 14, no. 7 (July 1998): 293. http://dx.doi.org/10.1016/s0169-4758(98)01259-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Smith, Tom, and Mark Booth. "Quantification of malaria transmissibility." Parasitology Today 12, no. 12 (December 1996): 495–96. http://dx.doi.org/10.1016/0169-4758(96)88863-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Li, X. Z., X. B. Yue, X. J. Dong, and Z. K. Peng. "Response transmissibility versus power spectrum density transmissibility: Dynamic property analysis and comparison." Journal of Sound and Vibration 454 (August 2019): 32–50. http://dx.doi.org/10.1016/j.jsv.2019.04.019.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Wang, Dong-Mei, and Rui Yang. "Investigation of vibration transmissibility for paper honeycomb sandwich structures with various moisture contents." Mechanics & Industry 20, no. 1 (2019): 108. http://dx.doi.org/10.1051/meca/2019002.

Full text

Abstract:

Vibration transmissibility is an important factor to characterize the vibration absorption performance of cushioning packaging materials during transportation. Reasonable prediction of vibration transmissibility can guide antivibration design and reduce packaging cost. As a kind of green cushioning material, paper honeycomb sandwich structure is widely used in transport packaging because of its good machinability. But at the same time, it also has strong water absorption capacity. To a great extent, the vibration transmissibility of paper honeycomb sandwich structure may be affected by ambient humidity. In this research, the vibration transmissibility of paper honeycomb sandwich structures with various structure sizes under different humidity was tested by sine frequency sweep experiments. The rule of maximal vibration transmissibility with moisture content, cell length of honeycomb, and thickness of sandwich structure was analyzed. The results show that the maximal vibration transmissibility of paper honeycomb sandwich structure increases with the increase of moisture content, cell length of honeycomb, and thickness of sandwich structure. In order to construct the relationship between maximal vibration transmissibility and various factors, the moisture content was standardized. Finally, the maximal vibration transmissibility evaluation equation of paper honeycomb sandwich structure containing standardized moisture content and size of sandwich structure was obtained, which is of some reference value for vibration prediction of paper honeycomb sandwich structures.

APA, Harvard, Vancouver, ISO, and other styles

14

Rus, Shaiqah Mohd, Najibah Abd Latif, Mohd Imran Ghazali, and Anika Zafiah M. Rus. "Characteristics of UV Irradiated Waste Biopolymer from Renewable Resources (Part 1)." Advanced Materials Research 974 (June 2014): 252–56. http://dx.doi.org/10.4028/www.scientific.net/amr.974.252.

Full text

Abstract:

Waste cooking oil has proven to be a problematic material in the developed countries since people usually pour waste cooking oil into the kitchen drainage because they unaware that this waste can be recycled. Thus, in this study, the converted waste cooking oil into polymer was fabricated by using hot compression machine and named as waste biopolymer (WB). Vibration transmissibility test was conducted to determine the WB characteristics before and after UV-irradiated. It is revealed the similar vibration transmissibility responses curves were obtained at 1mm, 0.1g and 0.15g base excitation levels for the entire testing frequency except for the displacement transmissibility from base to moveable top plate at 1.5 mm. There was only one resonance peak occurred over the testing frequency which was 15 - 23 Hz for the displacement transmissibility and 15 – 25 Hz for the acceleration transmissibility test on shaking table. No other variation used on the displacement and acceleration amplitude to control the transmissibility test of UV-irradiated WB system based on shaking table. Evidently, small changes on the frequency of the vibration transmissibility were shifted to higher value of UV-irradiated WB with overall percentages of changes are below 5% except for displacement transmissibility at 1.5 mm. This shows the photo-stability of WB after UV-irradiation is high and could be used for further study.

APA, Harvard, Vancouver, ISO, and other styles

15

Quanfu, Gao, Zhu Dapeng, and Cao Xingxiao. "Experimental Study on Vibration Transmissibility Properties of Honeycomb Paperboard." Open Mechanical Engineering Journal 8, no. 1 (September 16, 2014): 320–25. http://dx.doi.org/10.2174/1874155x01408010320.

Full text

Abstract:

The vibration transmissibility properties of a honeycomb paperboard are investigated by experiments. The analysis of the steady-state response of mass loaded honeycomb paperboard system to harmonic base excitation is presented in this paper. An experiment system is formulated and the vibration transmissibility data are obtained under different base excitation amplitude conditions. According to the transmissibility experiments data, we can assume that both the stiffness and damping properties are nonlinear. The hysteresis loops of the honeycomb paperboard-mass system are experimentally obtained, and are used to investigate the stiffness and damping properties of the system. The honeycomb paperboard’s uni-directional vibration transmissibility behavior is modeled by using nonlinear stiffness, the combination of velocity proportional damping and quadratic type nonlinear damping components. The parameters in the model are identified by use of one-term harmonic balance method and the parameters under different load condition are presented. The model and the parameters in this paper can be used to simulate the transmissibility-frequency curves accurately. The model can be used for understanding the vibration transmissibility behaviors of the honeycomb paperboard, and the simulated transmissibility-frequency curves can be used for the packaging design.

APA, Harvard, Vancouver, ISO, and other styles

16

Wu, Mingzhong, Sheng Jia, and Zhihong Lin. "An Experimental Study on the Vibration Transmission Characteristics of Wrist Exposure to Hand Transmitted Vibration." Applied Sciences 12, no. 4 (February 21, 2022): 2232. http://dx.doi.org/10.3390/app12042232.

Full text

Abstract:

This research intends to further improve the understanding of vibration damage mechanisms in the wrist area and to establish a more effective biodynamic model of the hand-arm system. Scholars have conducted some research work around the influencing factors of vibration response and commonly used vibration transmissibility to characterize the local vibration transmission characteristics of the hand-arm system. In this paper, a hand-transmitted vibration test platform was built according to ISO 10819, and a random combination of four ergonomic factors, namely wrist posture, arm posture, grip force, and thrust force, was used to test the vibration response of six subjects’ wrists; the total vibration transmissibility of the wrist was calculated according to the transmissibility formula. The effect of the four factors on the total vibration transmissibility of the wrist part was comprehensively analyzed, in which the wrist posture was proposed for the first time. The results show that (1) vibration transmissibility of the wrist is not only related to the arm posture, thrust force, and grip force but also related to the wrist posture; (2) the total vibration transmissibility and resonance frequency on the wrist has small correlation with large grip force and thrust force, and the vibration transmissibility of grip force 30 N and 60 N are basically equal in the low-frequency band (from 5–10 Hz to 5–20 Hz); (3) the wrist postures have a significant effect on the total vibration transmissibility at the wrist.

APA, Harvard, Vancouver, ISO, and other styles

17

YANG, LIN, HE GONG, and MING ZHANG. "TRANSMISSIBILITY OF WHOLE BODY VIBRATION STIMULI THROUGH HUMAN BODY IN DIFFERENT STANDING POSTURES." Journal of Mechanics in Medicine and Biology 12, no. 03 (June 2012): 1250047. http://dx.doi.org/10.1142/s0219519412004934.

Full text

Abstract:

This study focuses on the transmissibility of whole body vibration stimuli through human body in different standing postures to explore the mechanism in which vibration stimuli could be better used as a regimen for bone loss. Five volunteers were guided to stay at three standing postures and imposed of frequency-adjustable vibration stimuli on the plantar surfaces side-alternately. Motion capture system was used to acquire the vibration signals at head, pelvis, knee up, knee down and ankle, from which the transmissibility of vibration stimuli can be obtained. The results showed that transmissibility of vibration stimuli was closely correlated with frequency and skeletal sites. Transmissibility of vibration stimuli in head was much smaller than any other skeletal sites. Transmissibility in the ankle was always in the vicinity of unit one in all the three postures for the vibration stimuli applied side-alternately on the plantar surfaces of both feet. There was an obvious peak around 9 to 11 Hz in the transmissibility curves for knee joint and pelvis. In the resonant peak, transmissibility of vibration stimuli in knee joint and pelvis both exceeded unit one and reached 150%. As the frequency increased after 11 Hz, transmissibility of vibration stimuli decayed rapidly as a function of frequency and dropped to 25% at 30 Hz. This study may help to gain insight into the interaction mechanism between mechanical vibration stimuli and the responses of human musculoskeletal system.

APA, Harvard, Vancouver, ISO, and other styles

18

Kang, Jie, Hehua Ju, and Li Liu. "Comparison of response transmissibility and power spectral density transmissibility on operational modal analysis." Mechanical Systems and Signal Processing 160 (November 2021): 107912. http://dx.doi.org/10.1016/j.ymssp.2021.107912.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Silva, Patricia, Diogo Ribeiro, Joaquim Mendes, and Eurico Seabra. "Modal Identification of Train Passenger Seats Based on Dynamic Tests and Output-Only Techniques." Applied Sciences 13, no. 4 (February 10, 2023): 2277. http://dx.doi.org/10.3390/app13042277.

Full text

Abstract:

Railways are one of the most efficient and widely used mass transportation systems for mid-range distances, also being pointed out as the best strategy to reach European Union decarbonisation goals. However, to increase railways attractiveness, it is necessary to improve the quality of the ride, namely its comfort, by decreasing the vibration at the passenger level. This article describes the experimental vibration modal identification of train seats based on a dedicated set of dynamic tests performed on Alfa Pendular and Intercity trains. This work uses two output-only modal identification techniques: the transmissibility functions and the Enhanced Frequency Domain Decomposition (EFDD) method. The last method allows us to clearly distinguish the seat structural movements, particularly the ones related to torsion and bending of the seat frame, from the local vertical foam vibrations. The natural frequencies and mode shapes are validated by matching the results derived from the transmissibility functions and EFDD method. The identified modal parameters are particularly relevant to characterise the vibration transmissibility provided by the foams (local transmissibility) and the vibration transmissibility derived from the metallic seat frame (global transmissibility).

APA, Harvard, Vancouver, ISO, and other styles

20

Chen, Yong, Mian Jiang, Daoyong Wang, and Kuanfang He. "Vibration transmissibility suppression for hydraulic excavators in working conditions via multi-objective optimization." Noise & Vibration Worldwide 53, no. 1-2 (November 13, 2021): 80–88. http://dx.doi.org/10.1177/09574565211055783.

Full text

Abstract:

The mass variances of materials in buckets and the movements of excavation arms greatly impact powertrain vibration transmissibility in hydraulic excavators under working conditions. If the influence of mass variation among bucket contents and excavation arm motions on vibration transmissibility is not considered, then only limited improvements can be made to vibration isolation performance. In this paper, vibration transmissibility suppression for hydraulic excavators operating under working conditions were studied via multi-objective optimization for stiffness coefficients of suspension elements (SEs). First, the rigid-flexible coupling model of a hydraulic excavator with a flexible base was built using ADAMS software. In the model, the stiffness coefficients of the SEs were the targeted variables with constrained conditions, while the multi-objectives for optimization were the vibration transmissibility and energy decoupling rates of the powertrain. Vibration isolation transmissibility (VIT) of the mounting system was compared between situations with non-optimized and optimized stiffness coefficients. Finally, the amplitude changes of the resultant SE support forces were used to illustrate the effects of powertrain vibration transmissibility suppression. We found that the average value of VITs increases significantly during the optimization process for the stiffness coefficients of SEs, which indicates that the mounting system has better vibration isolation performance. The smaller amplitudes of the resultant support force illustrate the improvements to the performance of vibration transmissibility suppression of the powertrain via the optimization process.

APA, Harvard, Vancouver, ISO, and other styles

21

Abdullah, Nurafiqah, Nurul Hasan, Nawaf Saeid, Mysara Eissa Mohyaldinn, and El-Said Mamdouh Mahmoud Zahran. "The study of the effect of fault transmissibility on the reservoir production using reservoir simulation—Cornea Field, Western Australia." Journal of Petroleum Exploration and Production Technology 10, no. 2 (November 1, 2019): 739–53. http://dx.doi.org/10.1007/s13202-019-00791-6.

Full text

Abstract:

Abstract The focused area in this study is in the Cornea Field located in the Yampi Shelf, north-eastern Browse Basin, Australia. The field was stated to be an elongated unfaulted drape anticline over highly eroded basement. From the literature and seismic data, faults die at the basement in the Cornea Field. Therefore, no faults were considered previously. The tectonic activity was not apparent in the area with only deformation by gravitational movements and compaction in the basement zone. However, fault might present in the reservoir and seal depth as time passed. Therefore, the aim of this study is to simulate the Cornea field with faults, to determine the effect of fault transmissibility on oil production. The study shows that the fault permeability and fault displacement thickness ratio have a close relationship with fault transmissibility. The fault transmissibility increases when fault permeability and fault displacement thickness ratio increase. Transmissibility multiplier was also considered in this study. The fault transmissibility increases with the increase in transmissibility multiplier, thus the oil production. This study contributes to the gap present in the research of the Cornea Field with fault structure, where it is important to consider fault existence during exploration and production.

APA, Harvard, Vancouver, ISO, and other styles

22

Zhou, Jun Wei, Lin He, Rong Wu Xu, and Li Lin Cui. "The Transmissibility Function Application in Ship Mechanical Noise Estimation." Applied Mechanics and Materials 431 (October 2013): 75–81. http://dx.doi.org/10.4028/www.scientific.net/amm.431.75.

Full text

Abstract:

The traditional response estimation model is based on force-response relationship. According to the transmissibility concept in linear time invariant system, a new response estimation method-transmissibility function (TF) method is provided based on response-response relationship. First, the principle of the method is interpreted in mathematic formula and the restriction condition is presented. Then, an engineering technique called operational conditions combination is presented for calculating the transmissibility function (TF) of vibration responses, and the guideline on how to devise the scheme of working conditions is discussed. Finally, the performance of the developed transmissibility function method is validated by a cylindrical double-shell exciting experiment.

APA, Harvard, Vancouver, ISO, and other styles

23

EFRON, NATHAN, and NOEL A. BRENNAN. "Simple Measurement of Oxygen Transmissibility." Clinical and Experimental Optometry 68, no. 1 (January 1985): 27–35. http://dx.doi.org/10.1111/j.1444-0938.1985.tb00738.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Blumberg, Seth. "Characterizing the transmissibility of cancer." Journal of Clinical Oncology 34, no. 15_suppl (May 20, 2016): e13076-e13076. http://dx.doi.org/10.1200/jco.2016.34.15_suppl.e13076.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Mills, Christina E., James M. Robins, and Marc Lipsitch. "Transmissibility of 1918 pandemic influenza." Nature 432, no. 7019 (December 2004): 904–6. http://dx.doi.org/10.1038/nature03063.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Zhang, Yu, Tong Zhu, and Jing Zhou. "Understanding Power Spectrum Density Transmissibility." Shock and Vibration 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/8479721.

Full text

Abstract:

Power spectrum density transmissibility (PSDT) is a type of complex frequency domain function proposed recently. It describes the relation between cross-spectra of system outputs. Since PSDTs with same local-reference degree of freedom (DOF) combination but with different transferring output DOFs cross each other at the system’s poles under certain load condition, the functions have been used as the primary data in operational modal analysis (OMA) to extract modal parameters, and such technique is named as PSDT-based OMA (PSDTOMA). Because PSDT is a concept that appears recently, researches on which, especially, in-depth discussions aim at the essence and properties of PSDT are very rare. For appropriate application of PSDTOMA, it is necessary to perform further study on such problem obviously. In this paper, two paths to get PSDT, which, respectively, are referred to as PSDT estimator and PSDT syntheticism, are given firstly; some properties about PSDT are explored based on the PSDT syntheticism, and the relation between PSDT and single reference transmissibility function (STF) is analyzed. Finally, the above conclusions are verified with numerical values and experimental data.

APA, Harvard, Vancouver, ISO, and other styles

27

Tan, Chong Tin, and Kay Sin Tan. "Nosocomial Transmissibility of Nipah Virus." Journal of Infectious Diseases 184, no. 10 (November 15, 2001): 1367. http://dx.doi.org/10.1086/323996.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

SPLETE, HEIDI. "H1N1 Transmissibility Found Relatively Weak." Family Practice News 40, no. 1 (January 2010): 34. http://dx.doi.org/10.1016/s0300-7073(10)70037-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Walker, Joseph W., Barbara A. Han, Isabel M. Ott, and John M. Drake. "Transmissibility of emerging viral zoonoses." PLOS ONE 13, no. 11 (November 7, 2018): e0206926. http://dx.doi.org/10.1371/journal.pone.0206926.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Singh, Mahavir, P. P. Bhat, B. P. Mishra, and R. K. Singh. "Biological Transmissibility of Buffalopox Virus." Journal of Applied Animal Research 9, no. 1 (March 1996): 79–88. http://dx.doi.org/10.1080/09712119.1996.9706107.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Takeda, Yukio, and Hiroaki Funabashi. "Motion Transmissibility in Parallel Manipulators." Transactions of the Japan Society of Mechanical Engineers Series C 59, no. 560 (1993): 1142–47. http://dx.doi.org/10.1299/kikaic.59.1142.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Wang, Shuo, Mohammad Elahinia, and The Nguyen. "Displacement and Force Control of a Quarter Car Using a Mixed Mode MR Mount." Shock and Vibration 20, no. 1 (2013): 1–17. http://dx.doi.org/10.1155/2013/863183.

Full text

Abstract:

In hydraulic hybrid vehicles (HHV), vibration in dual-mode pump/motor units should be isolated from the chassis. A mixed mode magnetorheological (MR) fluid mount was adopted to isolate this vibration and was evaluated in a quarter car model. The MR fluid mount was designed to be able to operate in flow mode and squeeze mode independently and simultaneously. For HHVs, it is desirable to control force and displacement transmissibility. These simulation results presented a basis for designing an effective algorithm to control both the displacement transmissibility and force transmissibility. Moreover, a hierarchical controller for minimizing the two requirements for transmissibility was also constructed. At last, a fuzzy logic controller was devised to closely reproduce the effect of the hierarchical controller. The experiments were set up to facilitate the hardware-in-the-loop evaluation of the mount. Results from the experiments showed that the mixed mode MR fluid mount was able to achieve desired dynamic stiffness profile to minimize the dual-transmissibility criterion.

APA, Harvard, Vancouver, ISO, and other styles

33

Dziedziech, Kajetan, Wiesław Jerzy Staszewski, Krzysztof Mendrok, and Biswajit Basu. "Wavelet-Based Transmissibility for Structural Damage Detection." Materials 15, no. 8 (April 7, 2022): 2722. http://dx.doi.org/10.3390/ma15082722.

Full text

Abstract:

Short-time, abrupt events—such as earthquakes and other shock loadings—often lead to damage that is difficult to detect in structures using output-only vibration measurements. The time-variant transmissibility is proposed to tackle this problem. The approach is based on two-dimensional wavelet power spectra. The time-frequency transmissibility and relevant coherence function are used for structural damage detection in structural elements in buildings. Numerical simulations and experimental tests are used in these investigations. The results are compared with the classical transmissibility and time-variant input-output wavelet approach. The paper shows that output-only measurements and wavelet-based transmissibility can be used to monitor abrupt damage-related changes to structural dynamics.

APA, Harvard, Vancouver, ISO, and other styles

34

Sankaran, Kumar, Partheban Manoharan, Sofana Reka S, and Santanu Chattopadhyay. "A brief insight into the prediction of water vapor transmissibility in highly impermeable hybrid nanocomposites based on bromobutyl/epichlorohydrin rubber blends." Open Chemistry 16, no. 1 (December 4, 2018): 1207–13. http://dx.doi.org/10.1515/chem-2018-0124.

Full text

Abstract:

AbstractThe present work proposes a schematic model for predicting the water vapor transmissibility in hybrid nanocomposites based on bromobutyl (BIIR)/epichlorohydrin (CO) rubber blends. Morphology study reveals the exfoliation of nanoclay and development of hybrid nanostructures in the rubber nanocomposites. A unique correlation between water vapor transmissibility and gas (oxygen) permeability through the rubber nanocomposites has been systematically derived. The prediction of relative water vapor transmissibility was achieved by considering the polar path along with the existing tortuous path and has been validated. Interestingly, it is found that the water vapor transmissibility (TW) directly depends on the weight fraction of the polar rubber (ΦP) in the rubber blend and permeability to gas (PG) of the nanocomposites.

APA, Harvard, Vancouver, ISO, and other styles

35

Chuang, Long-Ren, Wen-Wen Yang, Po-Ling Chang, Vincent Chiun-Fan Chen, Chiang Liu, and Tzyy-Yuang Shiang. "Managing Vibration Training Safety by Using Knee Flexion Angle and Rating Perceived Exertion." Sensors 21, no. 4 (February 7, 2021): 1158. http://dx.doi.org/10.3390/s21041158.

Full text

Abstract:

Whole-body vibration (WBV) is commonly applied in exercise and rehabilitation and its safety issues have been a major concern. Vibration measured using accelerometers can be used to further analyze the vibration transmissibility. Optimal bending angles and rating of perceived exertion (RPE) evaluations have not been sufficiently explored to mitigate the adverse effect. Therefore, the aims of this study were to investigate the effect of various knee flexion angles on the transmissibility to the head and knee, the RPE during WBV exposure, and the link between the transmissibility to the head and the RPE. Sixteen participants randomly performed static squats with knee flexion angles of 90, 110, 130, and 150 degrees on a WBV platform. Three accelerometers were fixed on the head, knee, and center of the vibration platform to provide data of platform-to-head and platform-to-knee transmissibilities. The results showed that the flexion angle of 110 degrees induced the lowest platform-to-head transmissibility and the lowest RPE (p < 0.01). A positive correlation between RPE and the platform-to-head transmissibility was observed. This study concluded that a knee flexion of about 110 degrees is most appropriate for reducing vibration transmissibility. The reported RPE could be used to reflect the vibration impact to the head.

APA, Harvard, Vancouver, ISO, and other styles

36

Reina, Salvatore, Cèsar Ayabaca, Diego Venegas, Iván Zambrano, William Venegas, Carlos Vila, and Victor Ordoñez. "Experimental Validation in a Controlled Environment of a Methodology for Assessing the Dynamic Behavior of Railway Track Components." Machines 10, no. 5 (May 19, 2022): 394. http://dx.doi.org/10.3390/machines10050394.

Full text

Abstract:

This article presents a novel methodology conducted under controlled laboratory conditions to assess the dynamic behavior of the components of railway tracks by applying an unbalanced mass excitation force. The methodology for obtaining accurate measurements, which uses different excitation parameters, is based on an unbalanced mass device, and from these data, the transmissibility of the mass-elastomer system is estimated. For assessment of the dynamic behavior, different sine sweep rate excitations, the unbalanced mass, and background noise are considered. The experimental measurements of transmissibility with a shaker and an unbalanced mass device are performed to validate the methodology. For this, frequency-by-frequency transmissibility measurements and the swept sine were performed by the shaker, with a sine sweep from 1 to 51 Hz, using the unbalanced mass device with different sine sweep rates and unbalanced mass. The results obtained allow comparison of the transmissibility by excitation at specific frequencies and the sine sweep to validate the excitation parameters of the unbalanced mass device. Thus, a transmissibility estimation error with the sweep rate, the unbalanced mass, and the background noise is developed. By using the proposed methodology, it is possible to lower the error of the estimated transmissibility of the system with background noise.

APA, Harvard, Vancouver, ISO, and other styles

37

Wu, Sen, Bin Wang, and Hai Hua Zhang. "The Feasibility Study of Vibration Transmissibility Applied to Structure Damage Identification." Applied Mechanics and Materials 347-350 (August 2013): 107–10. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.107.

Full text

Abstract:

In view of the defects of the traditional damage identification method based on vibration,the damage identification method based on vibration transmissibility is put forward. The feasibility of the vibration transmissibility applied to structural damage identification is analyzed by the numerical simulation experiment of a cantilever beam, the analysis results show that, vibration transmissibility contains the structure damage severity, damage location and other useful information, and all the information is favor of the damage identification.

APA, Harvard, Vancouver, ISO, and other styles

38

Cao, Mao Sen, Qing Wen Ren, and Pi Zhong Qiao. "Novel Structural Damage Indices: Vibration Transmissibility and its Curvatures." Key Engineering Materials 324-325 (November 2006): 343–46. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.343.

Full text

Abstract:

A new definition of vibration transmissibility, “the ratio of FRFs (Frequency Response Functions)”, is proposed to provide novel structural damage indices, i.e., vibration transmissibility and its real and complex curvatures. Using the FRF and its real and complex curvatures as references, the fundamental studies on performance of damage indices to reflect structural low-level damages are conducted using vibration-based nondestructive evaluation of a frame structure. The experimental results demonstrate that the sensitivity of the damage indices increases in the order of vibration transmissibility or FRF, and its real and complex curvatures. While the vibration transmissibility and its real and complex curvatures possess higher damage sensitivity than the FRF counterparts. The proposed novel damage indices are promising to develop viable and advanced structural nondestructive evaluation techniques.

APA, Harvard, Vancouver, ISO, and other styles

39

Yu, Yangyang, Yuan Liu, Shi Zhao, and Daihai He. "A simple model to estimate the transmissibility of the Beta, Delta, and Omicron variants of SARS-COV-2 in South Africa." Mathematical Biosciences and Engineering 19, no. 10 (2022): 10361–73. http://dx.doi.org/10.3934/mbe.2022485.

Full text

Abstract:

<abstract> <p>The COVID-19 pandemic caused multiple waves of mortality in South Africa, where three genetic variants of SARS-COV-2 and their ancestral strain dominated consecutively. State-of-the-art mathematical modeling approach was used to estimate the time-varying transmissibility of SARS-COV-2 and the relative transmissibility of Beta, Delta, and Omicron variants. The transmissibility of the three variants were about 73%, 87%, and 276% higher than their preceding variants. To the best of our knowledge, our model is the first simple model that can simulate multiple mortality waves and three variants' replacements in South Africa. The transmissibility of the Omicron variant is substantially higher than that of previous variants.</p> </abstract>

APA, Harvard, Vancouver, ISO, and other styles

40

Zhou, Yun-Lai, E. Figueiredo, N. Maia, and R. Perera. "Damage Detection and Quantification Using Transmissibility Coherence Analysis." Shock and Vibration 2015 (2015): 1–16. http://dx.doi.org/10.1155/2015/290714.

Full text

Abstract:

A new transmissibility-based damage detection and quantification approach is proposed. Based on the operational modal analysis, the transmissibility is extracted from system responses and transmissibility coherence is defined and analyzed. Afterwards, a sensitive-damage indicator is defined in order to detect and identify the severity of damage and compared with an indicator developed by other authors. The proposed approach is validated on data from a physics-based numerical model as well as experimental data from a three-story aluminum frame structure. For both numerical simulation and experiment the results of the new indicator reveal a better performance than coherence measure proposed in Rizos et al., 2008, Rizos et al., 2002, Fassois and Sakellariou, 2007, especially when nonlinearity occurs, which might be further used in real engineering. The main contribution of this study is the construction of the relation between transmissibility coherence and frequency response function coherence and the construction of an effective indicator based on the transmissibility modal assurance criteria for damage (especially for minor nonlinearity) detection as well as quantification.

APA, Harvard, Vancouver, ISO, and other styles

41

Yan, Hui, Liang Chen, Hong Rui Ao, and Hong Yuan Jiang. "The Experimental Research of Vibration Isolation Performance of MR Isolator at High Temperature." Applied Mechanics and Materials 184-185 (June 2012): 525–28. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.525.

Full text

Abstract:

Transmissibility is the main performance evaluation index of Metal Rubber (MR) isolator, which can be got by sine sweep frequency test. At different temperature, the sine sweep frequency test is done with different structural parameter MR isolator. The influence that relative density and pre-deformation have on transmissibility and natural frequency when temperature changed is analyzed. The changing regularity of MR isolator’s transmissibility at different temperature is explored. Research results provide the basis for designing MR isolator.

APA, Harvard, Vancouver, ISO, and other styles

42

Queiroz Gomes, Ely, Fábio Lúcio Santos, Moysés Nascimento, and Marco Antonio Zanella. "Transmissibility of coffee fruit-peduncle-branch systems submitted to vibration induced by impact." DYNA 87, no. 214 (July 1, 2020): 61–65. http://dx.doi.org/10.15446/dyna.v87n214.85186.

Full text

Abstract:

The development of efficient machines for coffee harvesting requires solid knowledge about the dynamic behavior of the plant. Vibration transmissibility is a parameter on dynamic behavior that may help understand this process. The aim of this study was to evaluate the average vibration transmissibility in coffee fruit-peduncle-branch samples containing unripe and ripe fruits. The experiments were performed using Arabica coffee plants of the cultivar Catuaí Vermelho. The samples were submitted to three vibration frequency levels, 20, 30 and 40 Hz, induced to the branch with impact of rigid fiberglass rods moving at a constant amplitude 2 mm. Data on acceleration were collected using an accelerometer fixed to the branch. The frequency of 20 Hz presented the highest transmissibility. Samples containing ripe fruits also presented high transmissibility when compared to those containing unripe fruits.

APA, Harvard, Vancouver, ISO, and other styles

43

Johnson, Timothy J., and Douglas E. Adams. "Transmissibility as a Differential Indicator of Structural Damage." Journal of Vibration and Acoustics 124, no. 4 (September 20, 2002): 634–41. http://dx.doi.org/10.1115/1.1500744.

Full text

Abstract:

This article discusses the use of frequency domain transmissibility functions for detecting, locating, and quantifying damage in linear and nonlinear structures. Structural damage affects both the system poles and zeros; however, zeros are much more sensitive than poles to localized damage. This is because zeros depend on the input and output locations whereas poles do not. It is demonstrated here that since transmissibility functions are determined solely by the system zeros, they are potentially better indicators of localized linear and nonlinear types of damage. Furthermore, excitation measurements are not required to compute transmissibility functions so damage indices can be calculated directly from response measurements. It is also demonstrated that sensor arrays can sometimes be used to yield mixed transmissibility functions that are differential in nature, that is, they are less sensitive to gross fluctuations in the dynamic loading or environmental variables.

APA, Harvard, Vancouver, ISO, and other styles

44

Mîţiu, A. Mihaela, Daniel Constantin Comeagă, and Octavian G. Donţu. "The Control of Vibration Transmissibility Using an Electrodynamic Actuator – Passive Solution." Applied Mechanics and Materials 436 (October 2013): 158–65. http://dx.doi.org/10.4028/www.scientific.net/amm.436.158.

Full text

Abstract:

Starting with the mathematical model of a simple electro-mechanical system with 1 DOF, are identified the electrical parameters which may influence the efficiency of control of the system transmissibility using an electrodynamic actuator. Based on simulation of system operation and determination of transmissibility are obtained Bode diagrams and diagrams that shows the maximum variation of the resonance frequency of the system when varying the electrical parameters of the actuator. In the paper is indicated the limits of the theoretical and practical technical solutions to control mechanical transmissibility of a system using an electrodynamic actuator.

APA, Harvard, Vancouver, ISO, and other styles

45

Chukwuemeka, Obinwanne Junior, Damian C. Echendu, Isaura Ilorena D'Alva Brito dos Santos, Sharon Onwuka, and Osazee Agbonlahor. "REGIONAL VARIATION IN FLUID RESERVOIR THICKNESS, OXYGEN TRANSMISSIBILITY AND CORNEAL OEDEMA DURING SCLERAL LENS WEAR." Journal of Contact lens Research and Science 5, no. 1 (December 17, 2021): e32-e43. http://dx.doi.org/10.22374/jclrs.v5i1.48.

Full text

Abstract:

Purpose: To determine if regional variation in post lens fluid reservoir thickness (PLFT) during scleral lens wear leads to regional variation in oxygen transmissibility and corneal edema during 4 hours of non-fenestrated scleral lens wear.Methods: About 20 healthy subjects (mean age, 28.8 ± 4.2 years) were fitted with nonfenestrated rotationally symmetric scleral lenses. Anterior segment optical coherence tomography was used to measure cornea thickness before and after lens wear, PLFT 10 minutes and 4 hours after lens application, and scleral lens thickness (with the scleral lens in situ) 4 hours after scleral lens application. These measurements were limited to the central 6 mm and divided into three zones (central, mid-peripheral, and peripheral zones). In the mid-peripheral and peripheral zones, eight principal meridians were measured, generating 17 measurement points in total. Scleral lens thickness and PLFT measurements were corrected for optical distortions by a series of equations. Oxygen transmissibility was calculated by dividing the scleral lens oxygen permeability by the optically-corrected scleral lens thickness, taking into account the oxygen permeability of saline and fluid reservoir thickness.Results: A significant regional variation in PLFT (F = 12.860, P = 0. 012) was observed after 10 minutes of the lens application, PLFT was thickest and thinnest in the inferotemporal and the superonasal region of the peripheral zones( 322.6 ± 161.8 µm and 153.8 ± 96.4 µm, respectively); however, this variation was not statistically significant at 4 hours of scleral lens wear (F = 4.692; P = 0.073). Despite significant regional variation in oxygen transmissibility (F = 48.472; P = 0.001) and relatively low oxygen transmissibility through the scleral lens, induced corneal edema did not vary significantly in different regions (F = 3.346; P = 0.126). In the central corneal region, the induced corneal edema correlated moderately with PLFT (r = 0.468; P = 0.037) and oxygen transmissibility (r = -0.528; P = 0.017). This relationship was insignificant in the peripheral cornea.Conclusion: The inferotemporal peripheral region had the thickest PLFT and least oxygen transmissibility, and the superonasal region had the vice versa. Despite significant variation in PLFT and oxygen transmissibility initially, in healthy corneas, this variation does not seem to induce statistically significant regional variation in corneal edema. Increased central PLFT and decreased oxygen transmissibility moderately correlate with central corneal edema.

APA, Harvard, Vancouver, ISO, and other styles

46

Li, Chong, Yixuan Wu, Haoyue Yang, Luke L. Jenkins, Robert N. Dean, and George T. Flowers. "A Microcontroller Approach to Measuring Transmissibility of MEMS Devices." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, DPC (January 1, 2015): 001564–93. http://dx.doi.org/10.4071/2015dpc-wp31.

Full text

Abstract:

The transmissibility reveals two very useful characteristics of a micro-electro-mechanical systems (MEMS) device, the resonant frequency and the mechanical quality factor. Real time knowledge on these two important factors can enhance application performance or avoid potential problems from environmental disturbances due to fabrication tolerances and the resulting operational differences in otherwise identical devices. Expensive laboratory equipment is typically used to measure the transmissibility. However, these test systems are not readily adaptable to field use. Therefore, it is important to be able to measure the transmissibility using a real time technique with a simplified test setup. This study proposes a technique that can compute the transmissibility in real time using a low cost microcontroller. This technique utilizes two laser vibrometers to detect the input and output motions of the proof mass in a MEMS device, which are fed to high speed 500 KHz analog to digital converters (ADC) in the microcontroller. A filtering step is performed to decrease noise. After the sampling and pre-filtering, a Fast Fourier Transform (FFT) is performed to convert the time-domain signals to frequency domain signals. The amplitude of the output signal at each frequency is divided by the amplitude of the corresponding input signal at each frequency to obtain the transmissibility. To overcome the difficulties resulting from measurement and quantization noise, a recursive calculating algorithm and a de-quantization filter are introduced. The recursive calculating process guarantees that the system updates the results continually, which results in a transmissibility plot covering the entire bandwidth. The de-quantization filter considers the validity of the data and performs the transmissibility division step accordingly. A cantilevered structure was chosen as the device-under-test to verify and evaluate this technique. The cantilevered device was attached to an electromechanical shaker system for vibratory stimulation. Two laser vibrometers were used to detect the input and output motion and this data was fed into a microcontroller. The microcontroller was STM32F407, which is 32-bit and 168 MHz controller. The tests demonstrated that this technique can measure the transmissibility and therefore the resonant frequency and mechanical quality factor accurately compared to a professional signal analyzer.

APA, Harvard, Vancouver, ISO, and other styles

47

Liang, Ning, Dongmei Wang, Yanfeng Guo, Rui Yang, Qianghua Liao, Ziyou Bai, Yungang Fu, Chen Luo, and Hong Zhu. "Analysis of energy dissipated by damping for paper honeycomb sandwich plate-block system." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 18 (July 18, 2019): 6483–90. http://dx.doi.org/10.1177/0954406219862301.

Full text

Abstract:

The vibration transmissibility of paper honeycomb sandwich plate was tested and the vibration transmissibility curve was simplified and characterized. Based on the basic principle of vibration mechanics, the equation for calculating the energy dissipated by damping of paper honeycomb sandwich plate-block system during vibration was deduced. Furthermore, the effects of honeycomb structural parameters (cell length, sandwich plate thickness) and block mass on the damping energy dissipation were analyzed. The results showed that the curves of vibration transmissibility for paper honeycomb sandwich plate can be divided into three regions: plateau region, amplification region, and attenuation region. The vibration transmissibility ratio in different regions can be expressed as functions of frequency. The energy dissipated by damping of paper honeycomb sandwich plate-block system depends on its vibration transmissibility. If the vibration transmissibility ratio–frequency curve is obtained, the damping energy dissipation of the system can be calculated. The total energy dissipation of paper honeycomb sandwich plate-block system during vibration is about equal to that of plateau region, and the energy dissipated in amplification and attenuation region can be neglected. Different honeycomb structural parameters have the same effect on the damping energy dissipation of the system. Block mass has little effect on the damping energy dissipation in plateau region and the total energy dissipation during vibration but has a greater impact on the energy dissipation in the amplification and attenuation regions. The purpose of this paper is to provide a basic method for calculation of energy dissipated by damping and evaluation of anti-vibration property for packaging material.

APA, Harvard, Vancouver, ISO, and other styles

48

López-Moya, J. J., R. Y. Wang, and T. P. Pirone. "Context of the coat protein DAG motif affects potyvirus transmissibility by aphids." Journal of General Virology 80, no. 12 (December 1, 1999): 3281–88. http://dx.doi.org/10.1099/0022-1317-80-12-3281.

Full text

Abstract:

Previous work with tobacco vein mottling virus (TVMV) has established that a highly conserved three amino acid motif, asp-ala-gly (DAG), located near the N terminus of the coat protein (CP), is important for aphid transmission. However, several other potyviruses which have motifs other than DAG are aphid-transmissible. Creation of these motifs in TVMV through site-directed mutagenesis failed to render TVMV aphid-transmissible from infected plants, and the creation of a putative complementary motif in the helper component did not restore transmissibility. In an isolate of tobacco etch virus (TEV) that contains two consecutive DAG motifs separated by a single ala, transmissibility was abolished or reduced by mutations affecting the first motif, whereas mutations in the second motif had little or no effect. In a TEV mutant made non-transmissible due to an altered first motif, substitution of val for ala in the position immediately before the second DAG restored transmissibility, whereas changing val to ala in the location prior to the first DAG resulted in reduced TEV transmissibility. In contrast, a val to ala change in the position preceding the single DAG motif of TVMV did not affect transmission. Creation of another DAG motif at the beginning of the TVMV CP core, in a position where certain other potyviruses have a second DAG motif, did not restore transmissibility. Our results suggest that the mere presence of a DAG motif does not guarantee transmissibility and that the context in which the DAG or equivalent motif is found plays a role in the process.

APA, Harvard, Vancouver, ISO, and other styles

49

Zhang, Xiao Long, Ya Bin Dong, and Yu Min He. "Theoretical Analysis for Force Transmissibility and Jump Phenomena of Duffing Spring Type Vibration Isolator." Applied Mechanics and Materials 224 (November 2012): 11–17. http://dx.doi.org/10.4028/www.scientific.net/amm.224.11.

Full text

Abstract:

In order to study the common nonlinear characteristics of the vibration isolator, a single degree of freedom system with cubic restoring force is introduced to describe the nonlinear vibration isolation system in the paper and the harmonic balance method was applied to investigate the primary resonance near the natural frequency of the system. Based on Routh–Hurwitz stability criterion, it was clarified theoretically that the region surrounded by the curve of the vertical tangential points in the curve cluster of the primary resonance amplitude frequency characteristics was instable. In addition, the equations of the jump frequency and force transmissibility were derived. The calculated results showed that the jump, hysteresis, stable and instable phenomena would take place for the force transmissibility of the isolator system and the effect of high frequency components of the transmitting force was limited; the damping, coefficient of nonlinear restoring force and the excitation amplitude had an influence on the force transmissibility whose frequencies were in the region of the resonance frequencies but not on those whose frequencies were lower than the resonance frequencies, and only the damping would affect the force transmissibility whose frequencies were higher than the resonance frequencies. Finally, the equation of the start frequency, on the condition that the force transmissibility was less than 1, was presented.

APA, Harvard, Vancouver, ISO, and other styles

50

Yan, Dawei, Binbin Wang, Ying Shi, Xintao Ni, Xiaogang Wu, Xuesong Li, Xingpo Liu, et al. "A Single Mutation at Position 120 in the Envelope Protein Attenuates Tembusu Virus in Ducks." Viruses 14, no. 3 (February 22, 2022): 447. http://dx.doi.org/10.3390/v14030447.

Full text

Abstract:

A live attenuated duck Tembusu virus (TMUV) vaccine FX2010-180P (180P) was successfully utilized to prevent TMUV infections in ducks in China. Compared with wild-type TMUV, 180P was highly attenuated and lost transmissibility in ducks. However, the mechanism of the attenuation of 180P remains poorly understood. To explore the key molecular basis of attenuation, chimeric and site mutant viruses in the background of the wild-type TMUV-FX2010 (FX) strain were rescued, and the replication, tissue tropism, and transmissibility were characterized in ducks. The results show that the envelope (E) protein was responsible for attenuation and loss of transmission in ducks. Further studies showed that a D120N amino acid mutation located in domain II of the E protein was responsible for the attenuation and transmissibility loss of 180P in ducks. The D120N substitution resulted in an extra high-mannose type N-linked glycosylation (NLG) in the E protein of 180P compared with the wild-type TMUV, which might restrict the tissue tropism and transmissibility of TMUV in ducks. Our findings elucidate that N120 in the E protein is a key molecular basis of TMUV attenuation in ducks and provide new insight into the role of NLG in TMUV tissue tropism and transmissibility.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Transmissibility'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles