Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)最新文献_第3页

Experimental Forced Response Analysis of Two-Degree-of-Freedom Piecewise-Linear Systems With a Gap 带间隙的二自由度分段线性系统的实验强迫响应分析

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22289

A. Saito, Junta Umemoto, Kohei Noguchi, Meng-Hsuan Tien, Kiran D’Souza

引用次数: 1

Investigation of a Novel Tri-Stable Cantilever Beam With Two Magnets 新型双磁体三稳定悬臂梁的研究

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22003

Shuailing Sun, Y. Leng

引用次数: 2

Computational Modal Analysis of Half Scale Generic Business Jet Substructures 通用公务机半尺度子结构计算模态分析

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22317

Chris B. Lam, C. Mechefske

{"title":"Computational Modal Analysis of Half Scale Generic Business Jet Substructures","authors":"Chris B. Lam, C. Mechefske","doi":"10.1115/detc2020-22317","DOIUrl":"https://doi.org/10.1115/detc2020-22317","url":null,"abstract":"\u0000 The primary objective of this work was to determine the modal parameters of two substructures of a half scale generic business jet model with pre-stressed skin panels. The effect that pre-stiffened skin panels has on the modal parameters of an aircraft fuselage subsection is not well documented in the literature. First, bending pre-stress on stiffened plates was empirically determined to increase stiffness without changing mode shapes. Second, preliminary finite element models of the substructures determined that the effect of skin pre-stress was significant in one of the two substructures. Finally, an updating technique to account for stiffening effects was proposed and validated to be effectively used in the substructure, improving computational results across all metrics. It is recommended that the model updating procedure developed in this work be used to model skin pre-stress for aircraft fuselage substructures. The improved accuracy of the updated computational model should be of significant interest to the aerospace industry. Future work can be performed to further develop the model updating technique introduced in this work to allow for widespread application.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131135220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Response Characteristics of Systems With Parametric Excitation Through Damping and Stiffness 阻尼和刚度参数激励系统的响应特性

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22457

F. Afzali, B. Feeny

引用次数: 1

Electromechanical Diode: Acoustic Non-Reciprocity in Weakly Nonlinear Metamaterial With Electromechanical Resonators 机电二极管:带有机电谐振器的弱非线性超材料中的声学非互易性

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22145

M. Bukhari, O. Barry

{"title":"Electromechanical Diode: Acoustic Non-Reciprocity in Weakly Nonlinear Metamaterial With Electromechanical Resonators","authors":"M. Bukhari, O. Barry","doi":"10.1115/detc2020-22145","DOIUrl":"https://doi.org/10.1115/detc2020-22145","url":null,"abstract":"\u0000 Recent attention has been given to acoustic non-reciprocity in metamaterials with nonlinearity. However, the study of asymmetric cells has been limited to mechanical diodes only. There is no work reported on electromechanical rectifiers or diodes. This problem is investigated here by analytically and numerically studying a combination of nonlinear and linear chains coupled with electromechanical resonators. The system is simulated numerically using MATLAB built in integrator and the results are validated by results found in the literature. Numerical examples are carried out to obtain band structure, operation range of electromechanical diode, harvested power, and significant frequency shift, which is demonstrated using spectro-spatial analyses. The observed frequency shift is used to construct an electromechanical diode to guide the wave to propagate in one direction only. This only allows signal sensing for waves propagating in one direction and rejects any other signals. Furthermore, this electromechanical diode is evaluated by calculating the transmission ratio and the asymmetric ratio for a transient input signal.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116065199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Design and Laboratory Validation of a Force-Amplified Piezoelectric Energy Harvesting Unit 力放大式压电能量收集装置的设计与实验室验证

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22117

Cheng Chen, A. Sharafi, Jason Flores, R. Pena, Priscilla Mendoza, Helen Ayala, Steven Ortiz-Donato, Jian-Qiao Sun

引用次数: 1

On the Nonlinear Mode-Coupling in Ultra Precision Manufacturing Machines: Experimental and Analytical Analyses 超精密加工机械中的非线性模式耦合:实验与分析

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22398

S. K. Gupta, M. Bukhari, O. Barry, C. Okwudire

{"title":"On the Nonlinear Mode-Coupling in Ultra Precision Manufacturing Machines: Experimental and Analytical Analyses","authors":"S. K. Gupta, M. Bukhari, O. Barry, C. Okwudire","doi":"10.1115/detc2020-22398","DOIUrl":"https://doi.org/10.1115/detc2020-22398","url":null,"abstract":"\u0000 Recent studies in passively-isolated systems have shown that mode coupling is desirable for best vibration suppression, thus refuting the long-standing rule of mode decoupling. However, these studies have ignored the non-linearities in the isolators. In this work, we consider stiffness nonlinearity from pneumatic isolators and study the nonlinear free undamped vibrations of a passively-isolated ultra-precision manufacturing (UPM) machine. Experimental analysis is conducted to guide the mathematical formulation. The system comprises linearly and nonlinearly coupled in-plane horizontal and rotational motion of the UPM machine with quadratic nonlinear stiffness from the isolators. We present closed-form expressions using the method of multiple scales for two cases viz. the non-resonant case and the bounded internal resonance case. We validate our theoretical findings through direct numerical simulations. For the non-resonant case, we show that the system behaves similar to a linear system. However, for the nearly internal resonance case, we demonstrate strong energy exchange between the modes stemming from nonlinear mode coupling. We further study the effect of nonlinear mode coupling on the vibration isolation performance and demonstrate that mode coupling is not always desirable.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"1329 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121713838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Elastic Metasurfaces for Low-Frequency Flexural Wavefront Control 用于低频弯曲波前控制的弹性超表面

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22645

Zhen Lin, S. Tol

引用次数: 2

HPC FEM Calculations for Damping Estimation of Bladed Disk With Dry-Friction Contacts 干摩擦接触叶片盘阻尼估算的HPC有限元计算

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22070

L. Pešek, P. Šnábl, V. Bula

引用次数: 1

Mistuning Identification for Rotating Bladed Disks Using Stationary Measurements and Reduced Order Models 基于平稳测量和降阶模型的旋转叶片失谐辨识

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22652

Eric Kurstak, K. Look, Kiran D’Souza

{"title":"Mistuning Identification for Rotating Bladed Disks Using Stationary Measurements and Reduced Order Models","authors":"Eric Kurstak, K. Look, Kiran D’Souza","doi":"10.1115/detc2020-22652","DOIUrl":"https://doi.org/10.1115/detc2020-22652","url":null,"abstract":"\u0000 Although full-scale representative experiments provide critical data for final validation of designs, there is increasing emphasis on computational and reduced scale experiments to test out initial design concepts. This is true in many fields, especially in the field of turbomachinery; turbomachines are complex machines that operate at high temperatures and pressures for long durations of time and it is very expensive to build prototypes and conduct full scale testing. Stationary test rigs are cheaper to design and operate than rotating test rigs, but can lack the proper boundary conditions required to mimic actual operating conditions. A key characteristic of the design that is identified from experiments for bladed disks is mistuning. Mistuning are the sector to sector differences in bladed disks due to manufacturing tolerance, operational wear, or material deviations, and can lead to vibration localization. This work provides insight in correlating stationary mistuning measurements to the mistuning observed in a rotating bladed disk. The mistuning values from bench-top tests are shown to match the mistuning values from the rotating experiments. A parametric reduced order model (PROM) is constructed using stationary mistuning values to model the fully mistuned system, complete with rotational speed effects such as stress stiffening. The PROM enables changing the mistuning and rotational speed effects in the reduced space. The natural frequencies of the computational model are compared to the experimental blade frequencies to show that the computational model is similar to the experimental system. The final model can then be used to simulate the physical experiments using time integration methods.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132099667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0