Journal of Vibration and Acoustics-Transactions of the Asme最新文献_第3页

An engineering approach for estimating the radiation efficiency of orthogonally stiffened plates 估算正交加筋板辐射效率的工程方法

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2023-01-23 DOI: 10.1115/1.4056741

Christoph Knuth, G. Squicciarini, D. Thompson

{"title":"An engineering approach for estimating the radiation efficiency of orthogonally stiffened plates","authors":"Christoph Knuth, G. Squicciarini, D. Thompson","doi":"10.1115/1.4056741","DOIUrl":"https://doi.org/10.1115/1.4056741","url":null,"abstract":"\u0000 A systematic investigation of the sound radiation of orthogonally stiffened plates is presented using a numerical procedure that combines the finite element method with the Rayleigh integral. Results are computed for plates with different numbers of stiffeners, stiffener depth, and plate thickness to investigate the dependence on the most important parameters. Differences are seen in the radiation efficiency of stiffened plates compared with unstiffened panels. In the monopole region, the result depends on the type of mode that dominates the response. For excitation within a bay, the radiation efficiency is reduced to that of a single bay if the stiffeners are stiff enough. If excited on a stiffener, the plate tends to radiate sound over its full surface area. In the short-circuiting region, on average, the radiation efficiency is equal to that of a smaller bay-sized panel with clamped edges, regardless of the excitation position. Results from the systematic study of 120 numerical cases are used to develop asymptotic formulae for the radiation efficiency of stiffened plates based on existing formulae for unstiffened panels. For all tested configurations, the average difference between the formulae and the numerical calculations was 0.3 dB over the whole frequency spectrum, with a standard deviation of ±1.5 dB. Between the frequency bands, the mean value varied between −2 and 3 dB, with a standard deviation of up to ±1.5 dB in the monopole region and a larger variation of up to ±5 dB in the short-circuiting region.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89613512","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

Dynamic behavior of a spinning exponentially functionally graded shaft with unbalanced load 不平衡载荷下指数梯度旋转轴的动力特性

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2023-01-11 DOI: 10.1115/1.4056656

Guangding Wang, Qing Zhao, Liqing Chen, Huiqun Yuan

引用次数: 1

Acoustic radiation from stiffened double concentric large cylindrical shells: Part II Creeping waves 加劲双同心大圆柱壳的声辐射。第二部分蠕变波

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2023-01-05 DOI: 10.1115/1.4056634

Xiongtao Cao

引用次数: 0

Acoustic radiation from stiffened double concentric large cylindrical shells: Part I Circumferential harmonic waves 加劲双同心大圆柱壳的声辐射。第1部分周向谐波

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2023-01-05 DOI: 10.1115/1.4056633

Xiongtao Cao

引用次数: 1

Non-linear Dynamic Modelling and Analysis of Split-Torque Face-Gear Drive Systems 分矩面齿轮传动系统的非线性动力学建模与分析

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2023-01-05 DOI: 10.1115/1.4056632

Mustafa Ozgur Aydogan, Z. Saribay, H. Ozguven

{"title":"Non-linear Dynamic Modelling and Analysis of Split-Torque Face-Gear Drive Systems","authors":"Mustafa Ozgur Aydogan, Z. Saribay, H. Ozguven","doi":"10.1115/1.4056632","DOIUrl":"https://doi.org/10.1115/1.4056632","url":null,"abstract":"\u0000 A nonlinear dynamic model of a multi-mesh involute spur pinion-driven face-gear split-torque drive system is developed. The lumped mass model consists of five pinions and two face-gears with seven rotational degrees-of-freedom. Model includes two inputs, two outputs, and three idler gears meshing with two identical face gears at the bottom and top of the assembly. Face-gear tooth form and corresponding spur gear teeth are established by differential geometry and the theory of gearing. Face-gear drive system mesh stiffnesses are established by utilizing Finite Strip Method for the first time in the literature. The mesh stiffness and damping are time-variant. The model includes clearance type nonlinearity. The Harmonic Balance Method (HBM) is utilized to solve the nonlinear differential equations of motion. The results are compared with the time simulation results. The stability is checked with Floquet Theory and bifurcation diagrams from Poincare Sections. The model is fully capable of generating the tooth geometries, mesh stiffnesses, and gear train dynamics without reliance on any package programs. Hence, the model provides flexibility and fast computation for parametric studies compared to existing literature. The effect of the pinions' orientation angle patterns on the face-gear are investigated to evaluate the mesh phasing effects among system dynamic response. The effect of subharmonic motion on the dynamic response of the split-torque face-gear system is also demonstrated for the first time in the literature. The case studies demonstrate that subharmonic resonance peaks are avoided.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89399937","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

An improved time-domain equivalent source method for accurate indoor simulation of pass-by noise 一种改进的时域等效源方法，用于精确模拟室内旁通噪声

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-11-08 DOI: 10.1115/1.4056195

Ce Liu, Xiao-Zheng Zhang, Yong-Bin Zhang

{"title":"An improved time-domain equivalent source method for accurate indoor simulation of pass-by noise","authors":"Ce Liu, Xiao-Zheng Zhang, Yong-Bin Zhang","doi":"10.1115/1.4056195","DOIUrl":"https://doi.org/10.1115/1.4056195","url":null,"abstract":"\u0000 Time-domain equivalent source method (TDESM) has been employed for indoor simulation of pass-by noise (PBN). Despite removing the requirement of dedicated large semi-anechoic chambers for the microphone array technique, it is still difficult to obtain high simulation accuracy due to the existence of signal splicing error and ill-consideration of Doppler effect induced by the vehicle motion. In this paper, the TDESM is developed to improve the simulation accuracy of PBN. Unlike the previous TDESM, the improved TDESM (I-TDESM) models the PBN by superposing the contributions of an array of moving equivalent sources, which can take the influence of vehicle motion into account. The PBN at the receivers can be directly reconstructed via the sound field calculation of moving sources. Numerical studies and real vehicle experiments are implemented to demonstrate the feasibility of the I-TDESM. Simulation results show that the I-TDESM can naturally incorporate the Doppler effect and effectively eliminate the signal splicing error, thus improving the simulation accuracy. The experiment results of real vehicle further validate the I-TDESM.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89195615","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

DYNAMIC SENSITIVITIES TO FRACTAL MACHINE NOISES IN A MECHANICAL FACE SEAL 机械端面密封对分形机器噪声的动态灵敏度

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-11-08 DOI: 10.1115/1.4056194

I. Green

{"title":"DYNAMIC SENSITIVITIES TO FRACTAL MACHINE NOISES IN A MECHANICAL FACE SEAL","authors":"I. Green","doi":"10.1115/1.4056194","DOIUrl":"https://doi.org/10.1115/1.4056194","url":null,"abstract":"\u0000 Mechanical face seals are wide-spread in many applications of powered equipment and turbomachinery. Often machine vibration and noise are unavoidable because of changing conditions which can be persistent and forceful. In critical applications when seals fail, they may have significant or even catastrophic consequences. To ensure the safety of such machinery and its associated mechanical components, machine vibration and noise must be diagnosed and quantified to keep the system's response within certain limits. This work focuses on the dynamics of a flexibly mounted stator mechanical face seal that is subjected to combinations of broad-band noisy vibrations of the shaft and the housing. In all previous work, the positions of the housing and the shaft have been considered fixed. The current work relaxes that condition, augmenting the equations of motion to incorporate equipment's noisy vibrations. Noises are expediently produced by the Weierstrass-Mandelbrot (WM) fractal function. A numerical simulation ensues, and the time-domain responses are subject to spectral analyses. Results show that under some design conditions, the seal is largely insensitive to machine vibrations. However, under other conditions, the seal response to exterior machine noise exhibits a rich spectral content that stems from various transient phenomena that include intensified half-frequency whirl, near synchronous response at steady-state, and super-synchronous higher harmonic oscillations caused by face contact.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90928139","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

On the Influence of Nonlinear Inertial Forces on the Limit Cycle Oscillations of an Inextensible Plate in a Supersonic Axial Flow 非线性惯性力对超声速轴流中不可伸缩板极限环振荡的影响

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-10-31 DOI: 10.1115/1.4056127

S. Stanton, S. Choi, Kevin A. McHugh

{"title":"On the Influence of Nonlinear Inertial Forces on the Limit Cycle Oscillations of an Inextensible Plate in a Supersonic Axial Flow","authors":"S. Stanton, S. Choi, Kevin A. McHugh","doi":"10.1115/1.4056127","DOIUrl":"https://doi.org/10.1115/1.4056127","url":null,"abstract":"\u0000 Recent results in the literature highlight the impact of nonlinear inertial forces on the post-flutter Limit Cycle Oscillation (LCO) characteristics of highly deflected structures in supersonic axial flow. The current investigation examines how the ability to passively modulate nonlinear inertial forces may alter the overall aeroelastic response. The structural model is a one-dimensional nonlinear inextensible plate subject to nonlinear aerodynamic forces in accordance with a new, geometrically modified third-order Piston Theory. For the linear aeroelastic case, we find that non-homogeneous mass distribution elicits discontinuous increases in the critical Mach number for flutter and several flutter mode-switching phenomena that are not observed when mass is added homogeneously. The existence of several different flutter mode mechanisms as a function of a concentrated mass location leads to different post-flutter LCO amplitude behavior. This is found to transition the underlying nonlinear structural dynamics to either be stiffening (when lower-order modes merge) or softening (when higher-order modes merge), which in turn alter the influence of nonlinear aerodynamic forces. We also address discrepancies in LCO amplitude trends due the nonlinear inertial forces previously reported in the literature.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89882112","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

Did S. P. Timoshenko and P. Ehrenfest Overestimate the Importance of the Fourth-Order Time Derivative in Their Beam Theory? S. P. Timoshenko和P. Ehrenfest在他们的光束理论中是否高估了四阶时间导数的重要性?

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-10-14 DOI: 10.1115/1.4055975

I. Elishakoff

引用次数: 1

FURTHER INSIGHTS INTO THE TIMOSHENKO-EHRENFEST BEAM THEORY 对timoshenko-ehrenfest光束理论的进一步认识

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-10-14 DOI: 10.1115/1.4055974

J. Banerjee, D. Kennedy, I. Elishakoff

引用次数: 0