Pub Date : 2020-06-30DOI: 10.20855/ijav.2020.25.21574
A. Biselli, M. Coleman
The Euler-Bernoulli (E-B) beam is the most commonly utilized model in the study of vibrating beams. The exact frequency equations for this problem, subject to energy-conserving boundary conditions, are well-known; however, the corresponding dissipative problem has been solved only approximately, via asymptotic methods. These methods, of course, are not accurate when looking at the low end of the spectrum. Here, we solve for the exact frequency equations for the E-B beam subject to boundary damping. Numerous numerical examples are provided, showing plots of both the complex wave numbers and the exponential damping rates for the first five frequencies in each case. Some of these results are surprising.
{"title":"The Exact Frequency Equations for the Euler-Bernoulli Beam Subject to Boundary Damping","authors":"A. Biselli, M. Coleman","doi":"10.20855/ijav.2020.25.21574","DOIUrl":"https://doi.org/10.20855/ijav.2020.25.21574","url":null,"abstract":"The Euler-Bernoulli (E-B) beam is the most commonly utilized model in the study of vibrating beams. The exact frequency equations for this problem, subject to energy-conserving boundary conditions, are well-known; however, the corresponding dissipative problem has been solved only approximately, via asymptotic methods. These methods, of course, are not accurate when looking at the low end of the spectrum. Here, we solve for the exact frequency equations for the E-B beam subject to boundary damping. Numerous numerical examples are provided, showing plots of both the complex wave numbers and the exponential damping rates for the first five frequencies in each case. Some of these results are surprising.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"25 1","pages":"183-189"},"PeriodicalIF":1.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41535588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.20855/ijav.2020.25.2e96
J. Arenas
{"title":"Acoustics and Vibration in the Time of the Pandemic","authors":"J. Arenas","doi":"10.20855/ijav.2020.25.2e96","DOIUrl":"https://doi.org/10.20855/ijav.2020.25.2e96","url":null,"abstract":"","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"25 1","pages":"131-132"},"PeriodicalIF":1.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43474836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.20855/ijav.2020.25.21523
Yang Yang, Q. Zeng, L. Wan, Wang Liang, Guangjun Yin
The contact theory, such as the Hertz theory and Hunt-Crossley model can just solve the contact response when the sphere goes to the maximum compression but can’t solve the contact process. In traditional research the impact process is considered as a single degree of freedom dynamical spring-damping system, however, the calculated contact force is much greater than the actual one. Based on the shortage of the conducted studies, a new dimensionless parameter ωΩ is proposed in this paper, the mass-spring-damped oscillator model (MSDOM) and the new contact theory with the consideration of the sphere mass and ωΩ are established. The correctness of the theoretical model is verified by 3D simulation, and the optimal contact force model is obtained. Furthermore, influence rules of material properties and contact parameters on contact response were studied. The results show that the contact deformation, velocity, piecewise nonlinear contact force and acceleration based on MSDOM and ωΩ are effective to calculate the contact response. The contact stiffness, damping, material properties of sphere and elastic modulus of the plate have different influence on the contact response while the Poisson’s ratio ν2 has little effect on it.
{"title":"Research of Contact Response of an Elastic Sphere Impacting a Rigid Plate Based on the Mass-Spring-Damped Oscillator Model and Dimensionless Parameter omega_Omega","authors":"Yang Yang, Q. Zeng, L. Wan, Wang Liang, Guangjun Yin","doi":"10.20855/ijav.2020.25.21523","DOIUrl":"https://doi.org/10.20855/ijav.2020.25.21523","url":null,"abstract":"The contact theory, such as the Hertz theory and Hunt-Crossley model can just solve the contact response when the sphere goes to the maximum compression but can’t solve the contact process. In traditional research the impact process is considered as a single degree of freedom dynamical spring-damping system, however, the calculated contact force is much greater than the actual one. Based on the shortage of the conducted studies, a new dimensionless parameter ωΩ is proposed in this paper, the mass-spring-damped oscillator model (MSDOM) and the new contact theory with the consideration of the sphere mass and ωΩ are established. The correctness of the theoretical model is verified by 3D simulation, and the optimal contact force model is obtained. Furthermore, influence rules of material properties and contact parameters on contact response were studied. The results show that the contact deformation, velocity, piecewise nonlinear contact force and acceleration based on MSDOM and ωΩ are effective to calculate the contact response. The contact stiffness, damping, material properties of sphere and elastic modulus of the plate have different influence on the contact response while the Poisson’s ratio ν2 has little effect on it.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"25 1","pages":"141-152"},"PeriodicalIF":1.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48125312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.20855/ijav.2020.25.21676
S. Yong, Jiahao Shi, Zhanlong Li, Jinyi Lian, Q. Shi, B. Yan
A PAM (pneumatic artificial muscle) bionic kangaroo leg suspension is proposed on the basis of a kangaroo leg structure evolved from long-term hopping; the modelling and characteristics research are conducted to pursue a high-performance vehicle suspension system. Based on the PAM and kangaroo leg bone proportions, the bionic suspension structure is constructed by analysing and refining the kangaroo leg structure and functions. The dynamic equations are derived by the Lagrange’s Equations considering the rods system features and an Adams simulation model is built up to study the damping performance and parameter characteristics of the suspension. Moreover, a co-simulation of Adams and Matlab is performed under fuzzy control and PID control. The dynamic response characteristics of the suspension is simulated and analysed under the passive and active modes in the time and frequency domains. The result indicates that the vibration and shock of the vehicle body can be reduced effectively by the proposed suspension in passive, fuzzy control and PID control modes; compared with the passive mode, the damping performance of the suspension is better under the active control. The fuzzy control and the PID control are effective to reduce the suspension transmissibility, especially in the medium frequency ranges, and the two control effects are better than that of the passive mode in most frequency bands. The study result of this paper can provide a reference for the research and development of high-performance bionic suspension.
{"title":"Modelling and Dynamic Response Characteristics Study of a PAM Bionic Kangaroo Leg Suspension","authors":"S. Yong, Jiahao Shi, Zhanlong Li, Jinyi Lian, Q. Shi, B. Yan","doi":"10.20855/ijav.2020.25.21676","DOIUrl":"https://doi.org/10.20855/ijav.2020.25.21676","url":null,"abstract":"A PAM (pneumatic artificial muscle) bionic kangaroo leg suspension is proposed on the basis of a kangaroo leg structure evolved from long-term hopping; the modelling and characteristics research are conducted to pursue a high-performance vehicle suspension system. Based on the PAM and kangaroo leg bone proportions, the bionic suspension structure is constructed by analysing and refining the kangaroo leg structure and functions. The dynamic equations are derived by the Lagrange’s Equations considering the rods system features and an Adams simulation model is built up to study the damping performance and parameter characteristics of the suspension. Moreover, a co-simulation of Adams and Matlab is performed under fuzzy control and PID control. The dynamic response characteristics of the suspension is simulated and analysed under the passive and active modes in the time and frequency domains. The result indicates that the vibration and shock of the vehicle body can be reduced effectively by the proposed suspension in passive, fuzzy control and PID control modes; compared with the passive mode, the damping performance of the suspension is better under the active control. The fuzzy control and the PID control are effective to reduce the suspension transmissibility, especially in the medium frequency ranges, and the two control effects are better than that of the passive mode in most frequency bands. The study result of this paper can provide a reference for the research and development of high-performance bionic suspension.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"25 1","pages":"254-265"},"PeriodicalIF":1.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41808545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.20855/ijav.2020.25.21543
Y. Hsieh, Doan Minh Hai, Yue-Lin Hsieh
In this article, a three-dimensional (3D) lumped model of the human auditoria peripherals that consisted of four masses equipped with five major springs and major dashpots is presented. This model will support the quantitative basis for construction of a human middle ear physical model. This 3D lumped model consists of a human ear bone model having a similar working principle as the tiny mechanical structure. The 3D lumped model’s parameters were identified using previous anatomical data, and then constructed via a parameter optimizing process using 16 springs and dashpots that represent the tiny mechanical structure’s five connections. The computational results showed the sensitivity priority of the five connections to the stapes displacement with a variety of sound frequencies. Moreover, a detailed discussion of the five connections’ mechanical properties affecting the magnitude of the stapes displacement was also shown in this paper. As a result of increasing the stiffness in the joint of the middle ear bone connection, the stapes’ vibrational amplitude was increased. However, the magnitude of the value of the four masses reacts in a manner that is opposite to stapes displacement. Some specific frequency ranges of the voice properties to the mass and connector systems are also discussed in this paper. The details of the individual mass or joint activity to the stapes displacement at various frequency ranges are also presented. The model’s behaviors were calculated using the software ANSYS workbench 15.0, Solid works 2017, and the MATLAB R2015a. Our findings provide a relevant reference for related medical research.
本文建立了人体听觉外设的三维集总模型，该模型由四个质量体组成，配有五个主要弹簧和主要阻尼器。该模型将为构建人体中耳物理模型提供定量依据。这个三维集总模型由一个人耳骨模型组成，其工作原理与微小的机械结构相似。3D集总模型的参数是使用之前的解剖数据确定的，然后通过参数优化过程构建，使用16个弹簧和阻尼器来代表微小的机械结构的五个连接。计算结果表明，在不同声频下，五种连接方式对镫骨位移的灵敏度优先级不同。此外，本文还详细讨论了五种连接方式的力学性能对镫骨位移大小的影响。由于增加了中耳骨连接关节的刚度，镫骨的振动幅度增大。然而，四个质量值的大小以与镫骨位移相反的方式发生反应。本文还讨论了质量系统和连接器系统话音特性的特定频率范围。在不同频率范围内，还给出了个体质量或关节活动对镫骨位移的详细信息。利用ANSYS workbench 15.0、Solid works 2017和MATLAB R2015a对模型的行为进行了计算。本研究结果可为相关医学研究提供参考。
{"title":"A Three-Dimensional Lump Model on Performances of the Stapes Displacement under Different Mechanics Property Conditions of a Middle Ear","authors":"Y. Hsieh, Doan Minh Hai, Yue-Lin Hsieh","doi":"10.20855/ijav.2020.25.21543","DOIUrl":"https://doi.org/10.20855/ijav.2020.25.21543","url":null,"abstract":"In this article, a three-dimensional (3D) lumped model of the human auditoria peripherals that consisted of four masses equipped with five major springs and major dashpots is presented. This model will support the quantitative basis for construction of a human middle ear physical model. This 3D lumped model consists of a human ear bone model having a similar working principle as the tiny mechanical structure. The 3D lumped model’s parameters were identified using previous anatomical data, and then constructed via a parameter optimizing process using 16 springs and dashpots that represent the tiny mechanical structure’s five connections. The computational results showed the sensitivity priority of the five connections to the stapes displacement with a variety of sound frequencies. Moreover, a detailed discussion of the five connections’ mechanical properties affecting the magnitude of the stapes displacement was also shown in this paper. As a result of increasing the stiffness in the joint of the middle ear bone connection, the stapes’ vibrational amplitude was increased. However, the magnitude of the value of the four masses reacts in a manner that is opposite to stapes displacement. Some specific frequency ranges of the voice properties to the mass and connector systems are also discussed in this paper. The details of the individual mass or joint activity to the stapes displacement at various frequency ranges are also presented. The model’s behaviors were calculated using the software ANSYS workbench 15.0, Solid works 2017, and the MATLAB R2015a. Our findings provide a relevant reference for related medical research.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"25 1","pages":"162-173"},"PeriodicalIF":1.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48711161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.20855/ijav.2020.25.21687
D. Newland
For over 60 years, the torsional vibration of reciprocating aircraft engines has been controlled by centrifugal pendulum vibration absorbers. Loose weights attached to an engine’s crankshaft act as tuned-mass absorbers by oscillating at a frequency in proportion to rotational speed. More recently, similar loose masses have been attached to the flywheels of automobile engines. The need to achieve increased power from fewer cylinders, while reducing weight and improving economy, has exacerbated torsional vibration of the drive train. The dynamics of a wheel carrying many centrifugal pendulums of bifilar design has been the subject of a growing literature, but much less has been written about roller-type pendulums and about overall system performance. This paper is a new analysis of bifilar and roller systems and their design requirements. The current state of knowledge about practical design limitations is explained and the need for further research discussed.
{"title":"Developments in the Design of Centrifugal Pendulum Vibration Absorbers","authors":"D. Newland","doi":"10.20855/ijav.2020.25.21687","DOIUrl":"https://doi.org/10.20855/ijav.2020.25.21687","url":null,"abstract":"For over 60 years, the torsional vibration of reciprocating aircraft engines has been controlled by centrifugal pendulum vibration absorbers. Loose weights attached to an engine’s crankshaft act as tuned-mass absorbers by oscillating at a frequency in proportion to rotational speed. More recently, similar loose masses have been attached to the flywheels of automobile engines. The need to achieve increased power from fewer cylinders, while reducing weight and improving economy, has exacerbated torsional vibration of the drive train. The dynamics of a wheel carrying many centrifugal pendulums of bifilar design has been the subject of a growing literature, but much less has been written about roller-type pendulums and about overall system performance. This paper is a new analysis of bifilar and roller systems and their design requirements. The current state of knowledge about practical design limitations is explained and the need for further research discussed.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"25 1","pages":"266-277"},"PeriodicalIF":1.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.20855/ijav.2020.25.21666
M. Munjal
The design of a muffler with wide-band transmission loss (TL) is a basic requirement for automotive exhaust systems where the exhaust noise is spread over several harmonics of the engine firing frequency. This has led to the concept of a double-tuned expansion chamber. In the present paper, the concept of double-tuning is extended to the two-chamber mufflers. The author’s classical Velocity Ratio Algorithm is used here to analyze and design such a muffler. The relevant two-row array is manipulated and simplified to arrive directly at the single most significant term out of the 81 non-dimensional terms constituting the relevant Velocity Ratio. Examination of this single term reveals acoustics of the raised wide-band domes of the TL spectrum of the double-tuned two-chamber (DT2C) muffler vis-a-vis that of an equivalent longer double-tuned single-chamber muffler. Except for a low-frequency trough, its TL curve covers the entire frequency range of interest for control of automotive exhaust noise. It is also shown that the corresponding side-inlet side-outlet (SISO) DT2C muffler configuration has an identically similar wide-band TL spectrum to that of the co-axial muffler configuration. Finally, some guidelines are laid out for designing a DT2C muffler.
{"title":"Tuning a Two-Chamber Muffler for Wide-Band Transmission Loss","authors":"M. Munjal","doi":"10.20855/ijav.2020.25.21666","DOIUrl":"https://doi.org/10.20855/ijav.2020.25.21666","url":null,"abstract":"The design of a muffler with wide-band transmission loss (TL) is a basic requirement for automotive exhaust systems where the exhaust noise is spread over several harmonics of the engine firing frequency. This has led to the concept of a double-tuned expansion chamber. In the present paper, the concept of double-tuning is extended to the two-chamber mufflers. The author’s classical Velocity Ratio Algorithm is used here to analyze and design such a muffler. The relevant two-row array is manipulated and simplified to arrive directly at the single most significant term out of the 81 non-dimensional terms constituting the relevant Velocity Ratio. Examination of this single term reveals acoustics of the raised wide-band domes of the TL spectrum of the double-tuned two-chamber (DT2C) muffler vis-a-vis that of an equivalent longer double-tuned single-chamber muffler. Except for a low-frequency trough, its TL curve covers the entire frequency range of interest for control of automotive exhaust noise. It is also shown that the corresponding side-inlet side-outlet (SISO) DT2C muffler configuration has an identically similar wide-band TL spectrum to that of the co-axial muffler configuration. Finally, some guidelines are laid out for designing a DT2C muffler.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"25 1","pages":"248-253"},"PeriodicalIF":1.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44076907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.20855/ijav.2020.25.21649
Y. Ting, K. Chang, Chih-Hsuan Yu, Amelia Sugondo
In this paper, a new hybrid piezoelectric motor was developed. A range of degeneracy was found to obtain multiple choice of resonance frequency by adjusting the length of the elastic blocks neighboring to the longitudinal and torsional vibrators. A template was implemented in between the longitudinal and torsional vibrators to decrease the mutual vibration effect that effectively makes the calculated and actual driving frequency nearly close. Such configuration was instrumental to preserve the expected performance and reduce the trial-and-error design overhaul process of the elastic blocks. Moreover, a dual hybrid motor was easily formed by butting each stator of the two hybrid motors together with a rotor in the middle. Case studies of both single and dual hybrid motors are presented with both simulation and experimental results to demonstrate the structure design and the degeneracy approach. Besides the convenience of structurally combining two single hybrid motors to enhance the output, it was interesting to find out whether the proposed dual hybrid motor can significantly increase either the speed or torque by using different phase control methods. Therefore, using the dual hybrid motor provides a great advantage by providing an option for pursuing higher speed or larger torque output for certain applications.
{"title":"Design of a Single and Dual Hybrid Piezoelectric Motors","authors":"Y. Ting, K. Chang, Chih-Hsuan Yu, Amelia Sugondo","doi":"10.20855/ijav.2020.25.21649","DOIUrl":"https://doi.org/10.20855/ijav.2020.25.21649","url":null,"abstract":"In this paper, a new hybrid piezoelectric motor was developed. A range of degeneracy was found to obtain multiple choice of resonance frequency by adjusting the length of the elastic blocks neighboring to the longitudinal and torsional vibrators. A template was implemented in between the longitudinal and torsional vibrators to decrease the mutual vibration effect that effectively makes the calculated and actual driving frequency nearly close. Such configuration was instrumental to preserve the expected performance and reduce the trial-and-error design overhaul process of the elastic blocks. Moreover, a dual hybrid motor was easily formed by butting each stator of the two hybrid motors together with a rotor in the middle. Case studies of both single and dual hybrid motors are presented with both simulation and experimental results to demonstrate the structure design and the degeneracy approach. Besides the convenience of structurally combining two single hybrid motors to enhance the output, it was interesting to find out whether the proposed dual hybrid motor can significantly increase either the speed or torque by using different phase control methods. Therefore, using the dual hybrid motor provides a great advantage by providing an option for pursuing higher speed or larger torque output for certain applications.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"25 1","pages":"236-242"},"PeriodicalIF":1.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44220606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The State Key Laboratory of Fluid Power and Mechatronic Systems, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China. Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China. Zhejiang University Kunshan Innovation Institute, Kunshan 215347, China. Suzhou Zijingang Intelligent Manufacturing Equipment Co., Ltd., Kunshan 215347, China. Zhejiang Bofine Power Equipment Co., Ltd., Jiaxing 314303, China
{"title":"Dynamic Characteristics of an Elastic Structure with Thermal Effects","authors":"Guanhua Xu, Jianzhong Fu, W. He, Yuetong Xu, Zhiwei Lin, Bang-ping Gu, Jiafu Zhang","doi":"10.20855/ijav.2020.25.21578","DOIUrl":"https://doi.org/10.20855/ijav.2020.25.21578","url":null,"abstract":"The State Key Laboratory of Fluid Power and Mechatronic Systems, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China. Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China. Zhejiang University Kunshan Innovation Institute, Kunshan 215347, China. Suzhou Zijingang Intelligent Manufacturing Equipment Co., Ltd., Kunshan 215347, China. Zhejiang Bofine Power Equipment Co., Ltd., Jiaxing 314303, China","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"25 1","pages":"200-208"},"PeriodicalIF":1.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46651911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.20855/ijav.2020.25.21453
Fu-Shyang Chang, G. Flowers, R. Dean, J. Suhling, J. Roberts
Certain microelectromechanical systems (MEMS), particularly MEMS gyroscopes, are notably susceptible to high power acoustic noise, especially when the noise is at or near its resonant frequency. A micro scale open-through dual expansion chamber (ODEC) array package with a continuous transmission loss (TL) in a wide frequency range is proposed to diminish the impact of such noise on the performance of MEMS gyroscopes. An analytical model based on planar wave propagation in stationary air has been developed with the consideration of the thermo-acoustic effect near the inner rigid boundary regarding small scale. Experiments with ODEC groups and control groups (non-ODEC) samples have been conducted to verify the model and compare the performances. The ODECs perform in the manner of low-pass filters and both the experimental and the analytical results exhibit greater TL in the higher frequency ranges as compared to the corresponding control samples. In addition, the resonance effects of the ODEC itself are also experimentally observed to be a key factor in influencing the TL.
{"title":"Sound Attenuation Study of Micro-Scale Acoustic Package","authors":"Fu-Shyang Chang, G. Flowers, R. Dean, J. Suhling, J. Roberts","doi":"10.20855/ijav.2020.25.21453","DOIUrl":"https://doi.org/10.20855/ijav.2020.25.21453","url":null,"abstract":"Certain microelectromechanical systems (MEMS), particularly MEMS gyroscopes, are notably susceptible to high power acoustic noise, especially when the noise is at or near its resonant frequency. A micro scale open-through dual expansion chamber (ODEC) array package with a continuous transmission loss (TL) in a wide frequency range is proposed to diminish the impact of such noise on the performance of MEMS gyroscopes. An analytical model based on planar wave propagation in stationary air has been developed with the consideration of the thermo-acoustic effect near the inner rigid boundary regarding small scale. Experiments with ODEC groups and control groups (non-ODEC) samples have been conducted to verify the model and compare the performances. The ODECs perform in the manner of low-pass filters and both the experimental and the analytical results exhibit greater TL in the higher frequency ranges as compared to the corresponding control samples. In addition, the resonance effects of the ODEC itself are also experimentally observed to be a key factor in influencing the TL.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"25 1","pages":"133-140"},"PeriodicalIF":1.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45409750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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