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

Anechoic Stubs As a Means for Damping Frame Vibrations: Analysis Using an Exact Wave-Based Approach 消声存根作为一种阻尼车架振动的方法:使用精确的基于波的方法进行分析

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22078

Hangyuan Lv, M. Leamy

引用次数: 0

Free Vibration of Bistable Clamped-Clamped Beams: A Preliminary Study 双稳夹-夹梁自由振动的初步研究

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22560

Xiaolei Song, Haijun Liu

引用次数: 1

Deformable Blade Element and Unsteady Vortex Lattice Fluid-Structure Interaction Modeling of a 2D Flapping Wing 二维扑翼变形叶片单元与非定常涡点阵流固耦合建模

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22638

J. Reade, Mark A. Jankauski

{"title":"Deformable Blade Element and Unsteady Vortex Lattice Fluid-Structure Interaction Modeling of a 2D Flapping Wing","authors":"J. Reade, Mark A. Jankauski","doi":"10.1115/detc2020-22638","DOIUrl":"https://doi.org/10.1115/detc2020-22638","url":null,"abstract":"\u0000 Flapping insect wings experience appreciable deformation due to aerodynamic and inertial forces. This deformation is believed to benefit the insect’s aerodynamic force production as well as energetic efficiency. However, the fluid-structure interaction (FSI) models used to estimate wing deformations are often computationally demanding and are therefore challenged by parametric studies. Here, we develop a simple FSI model of a flapping wing idealized as a two-dimensional pitching-plunging airfoil. Using the Lagrangian formulation, we derive the reduced-order structural framework governing wing’s elastic deformation. We consider two fluid models: quasi-steady Deformable Blade Element Theory (DBET) and Unsteady Vortex Lattice Method (UVLM). DBET is computationally economical but does not provide insight into the flow structure surrounding the wing, whereas UVLM approximates flows but requires more time to solve. For simple flapping kinematics, DBET and UVLM produce similar estimates of the aerodynamic force normal to the surface of a rigid wing. More importantly, when the wing is permitted to deform, DBET and UVLM agree well in predicting wingtip deflection and aerodynamic normal force. The most notable difference between the model predictions is a roughly 20° phase difference in normal force. DBET estimates wing deformation and force production approximately 15 times faster than UVLM for the parameters considered, and both models solve in under a minute when considering 15 flapping periods. Moving forward, we will benchmark both low-order models with respect to high fidelity computational fluid dynamics coupled to finite element analysis, and assess the agreement between DBET and UVLM over a broader range of flapping kinematics.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"102 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":"132298520","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: 2

Parametric Stiffness in Large-Scale Wind-Turbine Blades and the Effects on Resonance and Speed Locking 大型风力发电机叶片参数刚度及其对共振和转速锁定的影响

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22717

Ayse Sapmaz, B. Feeny

引用次数: 0

Damage Identification Using Static and Dynamic Responses Based on Topology Optimization and Lasso Regularization 基于拓扑优化和Lasso正则化的静态和动态损伤识别

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22279

Ryo Sugai, A. Saito, H. Saomoto

引用次数: 1

Computing Natural Frequencies and Mode Shapes of an Axially Moving Non-Uniform Beam 计算轴向运动非均匀梁的固有频率和模态振型

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22073

A. Sinha

引用次数: 2

Investigating How Additively Manufactured Parts in Traditionally Manufactured Systems Affect the System Dynamic Properties 传统制造系统中增材制造部件对系统动态特性的影响研究

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22422

Lawrence W. Funke, B. Hylton, K. Brown, Mallory Sommer

{"title":"Investigating How Additively Manufactured Parts in Traditionally Manufactured Systems Affect the System Dynamic Properties","authors":"Lawrence W. Funke, B. Hylton, K. Brown, Mallory Sommer","doi":"10.1115/detc2020-22422","DOIUrl":"https://doi.org/10.1115/detc2020-22422","url":null,"abstract":"\u0000 Additive manufacturing (AM) sits poised to make a large impact on the manufacturing sector. Expanding from their original application in rapid prototyping, AM parts are increasingly appearing in full production systems. Using AM parts as replacement parts has recently been touted as a way to save money and increase efficiencies in supply chains. While much work has been done exploring the properties of individual AM parts and how they might affect supply chains, very little has been done to investigate the impact of AM parts as components in a larger system. In fact, there appears to be a lack of research into how AM components affect the system vibrational properties when used as replacement parts. This work sought to answer this question by investigating the effects of replacing a steel bar in a four-bar mechanism with an AM polylactic acid (PLA) bar. Both static and dynamic testing were performed on the system when it was entirely steel, and when one part was replaced with an AM PLA bar. The static results indicated that the dominant modal frequencies of the system were not significantly impacted by the change, possibly suggesting that AM components may be used as replacement parts without concern for shifting modes of vibration. The dynamic data showed that the reduction of mass in the link helped reduce vibrations during operation, suggesting that some care should be taken in matching part properties between AM components and the ones they are replacing. The authors do urge caution in applying and interpreting these results, though, as they are preliminary and require further investigation. Because of this, the paper concludes with suggestions on how to expand and extend these results to fill the gap in the literature identified herein.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"221 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":"115614110","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

Dynamic State Analysis of a Driven Magnetic Pendulum Using Ordinal Partition Networks and Topological Data Analysis 用序配分网络和拓扑数据分析驱动磁摆的动态状态

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22441

Audun D. Myers, Firas A. Khasawneh

{"title":"Dynamic State Analysis of a Driven Magnetic Pendulum Using Ordinal Partition Networks and Topological Data Analysis","authors":"Audun D. Myers, Firas A. Khasawneh","doi":"10.1115/detc2020-22441","DOIUrl":"https://doi.org/10.1115/detc2020-22441","url":null,"abstract":"\u0000 The use of complex networks for time series analysis has recently shown to be useful as a tool for detecting dynamic state changes for a wide variety of applications. In this work, we implement the commonly used ordinal partition network to transform a time series into a network for detecting these state changes for the simple magnetic pendulum. The time series that we used are obtained experimentally from a base-excited magnetic pendulum apparatus, and numerically from the corresponding governing equations. The magnetic pendulum provides a relatively simple, non-linear example demonstrating transitions from periodic to chaotic motion with the variation of system parameters. For our method, we implement persistent homology, a shape measuring tool from Topological Data Analysis (TDA), to summarize the shape of the resulting ordinal partition networks as a tool for detecting state changes. We show that this network analysis tool provides a clear distinction between periodic and chaotic time series. Another contribution of this work is the successful application of the networks-TDA pipeline, for the first time, to signals from non-autonomous nonlinear systems. This opens the door for our approach to be used as an automatic design tool for studying the effect of design parameters on the resulting system response. Other uses of this approach include fault detection from sensor signals in a wide variety of engineering operations.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"56 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":"126412086","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

Extracting Maximum Power in the Presence of Internal Inductance of Electromagnetic Energy Harvesting Systems 电磁能量收集系统中存在内感时的最大功率提取

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22751

Y. Sharma, L. Zuo

{"title":"Extracting Maximum Power in the Presence of Internal Inductance of Electromagnetic Energy Harvesting Systems","authors":"Y. Sharma, L. Zuo","doi":"10.1115/detc2020-22751","DOIUrl":"https://doi.org/10.1115/detc2020-22751","url":null,"abstract":"\u0000 In this paper, the effect of internal inductance of electromagnetic generators in the field of energy harvesting is discussed. Electromagnetic energy harvesters are typically operated at low frequencies. This results in the generator internal inductor impedance being significantly less than the generator internal resistance. However, at high frequencies, this inductance can no longer be ignored. Therefore, to maximize the harvested power, the internal inductance must be considered while designing the power electronics. This paper presents two methods to tackle this issue. The first method involves making use of a discrete capacitor which is able to reduce the inductance effect not just at resonant frequency but for the entire operating frequency range. The second method makes use of a concept similar to synchronized switching harvesting on inductors (SSHI) in piezoelectric energy harvesting. A capacitor and switch are added in the electromagnetic energy harvesting circuit to reduce the generator internal inductance effect. This method not only provides the benefit of performing well in the entire operating frequency range but also eliminates the need for precise maximum power tracking techniques, which further helps in reducing the circuit losses. Simulation results show a maximum power output increase of 56%.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"94 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":"126424199","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

Substructure Interface Reduction Techniques to Capture Nonlinearities in Bolted Structures 捕获螺栓结构非线性的子结构界面缩减技术

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22417

Aabhas Singh, M. Allen, R. Kuether

{"title":"Substructure Interface Reduction Techniques to Capture Nonlinearities in Bolted Structures","authors":"Aabhas Singh, M. Allen, R. Kuether","doi":"10.1115/detc2020-22417","DOIUrl":"https://doi.org/10.1115/detc2020-22417","url":null,"abstract":"\u0000 Structural dynamic finite element models typically use multipoint constraints (MPC) to condense the degrees of freedom (DOF) near bolted joints down to a single node, which can then be joined to neighboring structures with linear springs or nonlinear elements. Scalability becomes an issue when multiple joints are present in a system, because each requires its own model to capture the nonlinear behavior. While this increases the computational cost, the larger problem is that the parameters of the joint models are not known, and so one must solve a nonlinear model updating problem with potentially hundreds of unknown variables to fit the model to measurements. Furthermore, traditional MPC approaches are limited in how the flexibility of the interface is treated (i.e. with rigid bar elements the interface has no flexibility). To resolve this shortcoming, this work presents an alternative approach where the contact interface is reduced to a set of modal DOF which retain the flexibility of the interface and are capable of modeling multiple joints simultaneously. Specifically, system-level characteristic constraint (S-CC) reduction is used to reduce the motion at the contact interface to a small number of shapes. To capture the hysteresis and energy dissipation that is present during microslip of joints, a hysteretic element is applied to a small number of the S-CC Shapes. This method is compared against a traditional MPC method (using rigid bar elements) on a two-dimensional finite element model of a cantilever beam with a single joint near the free end. For all methods, a four-parameter Iwan element is applied to the interface DOF to capture how the amplitude dependent modal frequency and damping change with vibration amplitude.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"83 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":"127126069","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: 2