Journal of Vibration and Acoustics-Transactions of the Asme最新文献_第7页

Traveling and standing flexural waves in the micro-beam based on the fraction order nonlocal strain gradient theory 基于分数阶非局部应变梯度理论的微梁行驻弯曲波

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-07-14 DOI: 10.1115/1.4054977

Yuqian Xu, P. Wei, Yishuang Huang

{"title":"Traveling and standing flexural waves in the micro-beam based on the fraction order nonlocal strain gradient theory","authors":"Yuqian Xu, P. Wei, Yishuang Huang","doi":"10.1115/1.4054977","DOIUrl":"https://doi.org/10.1115/1.4054977","url":null,"abstract":"\u0000 The traveling and standing flexural waves in the micro-beam are studied based on the fraction order nonlocal strain gradient elasticity in the present paper. First, the Hamilton's variational principle is used to derive the governing equations and the boundary conditions with consideration of both the nonlocal effects and the strain gradient effects. The fraction order derivative instead of the integer order derivative is introduced to make the constitutive model more flexible while the integer order constitutive model can be recovered as a special case. Then, the Euler-Bernoulli beam and the Timoshenko beam are both considered and the corresponding formulations for them are derived. Two problems are investigated: 1) the dispersion of traveling flexural waves and the attenuation of the standing waves in the infinite beam. 2) The natural frequency of finite beam. The numerical examples are provided and the effects of the nonlocal and the strain gradient effects are discussed. The influences of the fraction order parameters on the wave motion and vibration behavior are mainly studied. It is found that the strain gradient effects and the nonlocal effect have opposite influences on the wave motion and vibration behavior. The fraction order also has evident influence on the wave motion and vibration behavior and thus can refine the prediction of the model.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":"458 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77030412","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}

引用次数: 1

Satellite vibration isolation using periodic acoustic black hole structures with ultrawide bandgap 利用超宽带隙周期性声黑洞结构进行卫星隔振

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-07-14 DOI: 10.1115/1.4054978

Xiaofei Lyu, H. Sheng, Meng-Xin He, Qian Ding, L.H. Tang, Tianzhi Yang

引用次数: 4

Broadband electromechanical diode: acoustic non-reciprocity in weakly nonlinear metamaterials with electromechanical resonators 宽带机电二极管:带机电谐振器的弱非线性超材料的声学非互易性

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-07-08 DOI: 10.1115/1.4054962

M. Bukhari, O. Barry

{"title":"Broadband electromechanical diode: acoustic non-reciprocity in weakly nonlinear metamaterials with electromechanical resonators","authors":"M. Bukhari, O. Barry","doi":"10.1115/1.4054962","DOIUrl":"https://doi.org/10.1115/1.4054962","url":null,"abstract":"\u0000 Recent attention has been given to acoustic non-reciprocity in metamaterials with nonlinearity. However, the study of asymmetric wave propagation has been limited to mechanical diodes only. Prior works on electromechanical rectifiers or diodes using passive mechanisms are rare in the literature. This problem is investigated here by analytically and numerically studying a combination of nonlinear and linear metamaterials coupled with electromechanical resonators. The nonlinearity of the system stems from the chain in one case and from the electromechanical resonator in another. The method of multiple scales is used to obtain analytical expressions for the dispersion curves. Numerical examples show potential for wider operation range of electromechanical diode, considerable harvested power, and significant frequency shift. The observed frequency shift is demonstrated using spectro-spatial analyses and it 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 signals in any other direction. The performance of this electromechanical diode is evaluated using the transmission ratio and the asymmetric ratio for a transient input signal. Design guidelines are provided to obtain the best electromechanical diode performance. The presented analyses show high asymmetry ratio for directional-biased wave propagation in the medium-wavelength limit for the case of nonlinear chain. Indeed, the present asymmetric and transmission ratios are higher than those reported in the literature for a mechanical diode. The operation frequencies can also be broadened to the long-wavelength limit frequencies using the resonator nonlinearity.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":"23 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91342911","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}

引用次数: 0

Novel WKB Solutions to the Non-Isentropic Helmholtz Equation in a Non-Uniform Duct with Mean Temperature Gradient and Mean Flow 具有平均温度梯度和平均流量的非均匀管道中非等熵亥姆霍兹方程的WKB新解

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-06-20 DOI: 10.1115/1.4054853

Sattik Basu, S. Padma Rani

{"title":"Novel WKB Solutions to the Non-Isentropic Helmholtz Equation in a Non-Uniform Duct with Mean Temperature Gradient and Mean Flow","authors":"Sattik Basu, S. Padma Rani","doi":"10.1115/1.4054853","DOIUrl":"https://doi.org/10.1115/1.4054853","url":null,"abstract":"We derive the generalized Helmholtz equation (GHE) governing non-isentropic acoustic fluctuations in a quasi 1-D duct with non-uniform cross-section, mean temperature gradient and non-uniform mean flow. Non-isentropic effects are included via heat conduction terms in the mean and fluctuating energy equations. To derive the Helmholtz equation exclusively in terms of the fluctuating pressure field, a relationship between density and pressure fluctuations is needed, which is shown to be a second-order differential equation for nonisentropic motions. Novel analytical solutions that are accurate for both low/high frequencies and small/large mean gradients are presented for the GHE based on the Wentzel–Kramers–Brillouin (WKB) method. WKB solutions are developed using the ansatz that the pressure fluctuation field has a travelling wave form, ˆp(x) = exp [∫0x (a + ib) dx], where x is the axial coordinate. Substituting this form into the Helmholtz equation yields coupled, nonlinear ordinary differential equations (ODEs) for a and b. Analytical solutions to the ODEs are obtained using the approximations of high frequency and slowly varying mean properties. This simplification allows us to obtain the lower order solutions b0 and a0. We then enhance solution accuracy by using a0 to solve for b1 without any approximations. Finally, b1 is employed to get a1, giving us the higher order solution. The ˆp calculated from (a1, b1) is in good to excellent agreement with numerical solution of the GHE for both low and high frequencies and for a range of mean Mach numbers, including M ≥ 1.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":"23 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89558484","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}

引用次数: 0

Topology Optimization and Wave Propagation of Three-dimensional Phononic Crystals 三维声子晶体的拓扑优化与波传播

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-06-07 DOI: 10.1115/1.4054745

Hao Gao, Y. Qu, Guang Meng

引用次数: 4

Efficient Hyper-Reduced Small Sliding Tribomechadynamics 高效超减小滑动摩擦力学

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-06-02 DOI: 10.1115/1.4054713

W. Witteveen, Lukas Koller

引用次数: 0

Dynamic Analysis of a Curved Beam with Tuning of Elastic Modulus and Mass Density in Circumferential Direction 周向弹性模量和质量密度可调弯曲梁的动力分析

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-05-26 DOI: 10.1115/1.4054672

M. Tatari, Soroush Irandoust, R. Ghosh, Yustianto Tjiptowidjojo, H. Nayeb-Hashemi

{"title":"Dynamic Analysis of a Curved Beam with Tuning of Elastic Modulus and Mass Density in Circumferential Direction","authors":"M. Tatari, Soroush Irandoust, R. Ghosh, Yustianto Tjiptowidjojo, H. Nayeb-Hashemi","doi":"10.1115/1.4054672","DOIUrl":"https://doi.org/10.1115/1.4054672","url":null,"abstract":"\u0000 Deformation and stress fields in a curved beam can be tailored by changing its mechanical properties such as the elastic modulus/mass density, which is typically done using functionally-graded materials (FGM). Such functional gradation can be done for instance by using particles or fiber reinforced materials with different volume fraction along the beam length. This paper presents in-plane vibrations of functionally-graded (FG) cantilevered curved beams. Both semi-analytical and finite element modeling are employed to find natural frequencies and mode shapes of such beams. The natural frequencies obtained from the analytical solution and finite element analysis are in close agreement with an error of 6.2% when the variance of material properties gradation is relatively small. In the analytical approach, direct method is employed to derive the governing linear differential equations of motion. The natural frequencies and mode shapes are obtained using the Galerkin and the finite element methods. First three natural frequencies and corresponding mode shapes are analyzed for different elastic modulus/mass density distribution functions. Furthermore, the natural frequencies of FG curved beams with a crack are also investigated. Our results indicate that larger cracks near the clamped side of the beam significantly decrease the first natural frequency. In the second and third vibration modes, cracks located in the area with a maximum moment result in lowest natural frequency values. However, the second and third natural frequencies of the cracked curved beam are not affected by presence of a crack, if crack is located at the nodal points of the curved beam.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":"494 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75208989","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}

引用次数: 1

An Approach to Modeling Percussive Drilling Systems Submitted for Publication 一种模拟冲击钻井系统的方法提交出版

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-05-03 DOI: 10.1115/1.4054472

Samuel Goldman, H. Flashner, Bing Yang

引用次数: 0

Stability and Robustness Analysis of Quasi-Periodic System subjected to Uncertain Parametric Excitations and Nonlinear Perturbations 不确定参数激励和非线性扰动下拟周期系统的稳定性和鲁棒性分析

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-04-18 DOI: 10.1115/1.4054359

Susheelkumar Cherangara Subramanian, S. Redkar

引用次数: 0

Unique Loss Factor Images for Complex Dynamic Systems 复杂动态系统的独特损耗因子图像

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-04-18 DOI: 10.1115/1.4054360

J. McDaniel, A. Liem, Allison Kaminski`

{"title":"Unique Loss Factor Images for Complex Dynamic Systems","authors":"J. McDaniel, A. Liem, Allison Kaminski`","doi":"10.1115/1.4054360","DOIUrl":"https://doi.org/10.1115/1.4054360","url":null,"abstract":"\u0000 Over the past century, a number of scalar metrics have been proposed to measure the damping of a complex system. The present work explores these metrics in the context of finite element models. Perhaps the most common is the system loss factor, which is proportional to the ratio of energy dissipated over a cycle to the total energy of vibration. However, the total energy of vibration is difficult to define for a damped system because the total energy of vibration may vary considerably over the cycle. The present work addresses this ambiguity by uniquely defining the total energy of vibration as the sum of the kinetic and potential energies averaged over a cycle. Using the proposed definition, the system loss factor is analyzed for the cases of viscous and structural damping. For viscous damping, the system loss factor is found to be equal to twice the modal damping ratio when the system is excited at an undamped natural frequency and responds in the corresponding undamped mode shape. The energy dissipated over a cycle is expressed as a sum over finite elements so that the contribution of each finite element to the system loss factor is quantified. The visual representation of terms in the sum mapped to their spatial locations creates a loss factor image. Moreover, analysis provides an easily computed sensitivity of the loss factor with respect to the damping in one or more finite elements.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":"116 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79227329","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}

引用次数: 0