Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)最新文献_第2页

Broadband and Enhanced Energy Harvesting Using Inerter Pendulum Vibration Absorber 利用惯性摆振器进行宽带和增强能量收集

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22200

Aakash Gupta, Wei-Che Tai

{"title":"Broadband and Enhanced Energy Harvesting Using Inerter Pendulum Vibration Absorber","authors":"Aakash Gupta, Wei-Che Tai","doi":"10.1115/detc2020-22200","DOIUrl":"https://doi.org/10.1115/detc2020-22200","url":null,"abstract":"\u0000 Inerter-based vibration energy harvesters (VEHs) have been widely studied to harvest energy from large-scale structural vibrations. Recently, there have been efforts to increase the operation frequency bandwidth of VEHs by introducing a variety of stiffness and inertia nonlinearity. This paper proposes a new inerter-based VEH comprising an epicyclic-gearing inerter and a pendulum vibration absorber. The centrifugal force of the pendulum introduces a new type of inertia nonlinearity that broadens the frequency bandwidth. This inerter-pendulum VEH (IPVEH) is incorporated in a single-degree-of-freedom structure to demonstrate its performance and the equations of motion of the system are derived. The method of multiple scales is applied to derive the amplitude–frequency response relationship of the harvested power in the primary resonance. The harvested power is optimized through tuning the harvester’s electrical damping and the optimum power is benchmarked with that of conventional linear inerter-based VEHs. The results show that the IPVEH has larger bandwidth and harvested power and the improvement is correlated with the strength of its inertia nonlinearity.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"29 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":"121202245","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

A Novel Bi-Stable Piezoelectric Energy Harvester Inspired by the Venus Flytrap 受捕蝇草启发的新型双稳态压电能量收集器

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22349

Feng Qian, L. Zuo

{"title":"A Novel Bi-Stable Piezoelectric Energy Harvester Inspired by the Venus Flytrap","authors":"Feng Qian, L. Zuo","doi":"10.1115/detc2020-22349","DOIUrl":"https://doi.org/10.1115/detc2020-22349","url":null,"abstract":"\u0000 This paper studies the nonlinear dynamics and energy harvesting performance of a novel bi-stable piezoelectric energy harvester inspired by the rapid shape transition of the Venus flytrap leaves. The harvester is composed of a piezoelectric MFC transducer, a tip mass, and two sub-beams. The two sub-beams are akin to the bidirectionally curved Venus flytrap leaves that could rapidly snap-through from the open state to the closed state. To realize the bistability of the Venus flytrap leaves induced by the stored potential energy, an in-plane pre-displacement constraint is applied to the free ends of the sub-beams. The pre-displacement constraint leads to bending and twisting deformations and creates the potential energy in the harvester. The bio-inspired design is introduced in detail and a prototype is fabricated to validate the conceptual design. The nonlinear dynamics of the bio-inspired bi-stable piezoelectric energy harvester is investigated under base acceleration excitations. Results show that the sub-beams of the harvester experience more complicated local vibrations containing broadband high-frequency components as the snap-through motion happens. The energy harvesting performance of the harvester is evaluated at different excitation levels. The broadband energy harvesting is achieved at higher excitation levels and an average power output of 0.193 mW is attained under the excitation of 10 Hz and 4.0 g.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"2 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":"122505906","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

Design and Amplitude Dependence of Resonance Frequency of Origami-Inspired Vibration Isolators With Quasi-Zero-Stiffness Characteristic 具有准零刚度特性的折纸式隔振器的设计及其共振频率的幅值依赖性

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22171

Kouya Yamaguchi, Sachiko Ishida

{"title":"Design and Amplitude Dependence of Resonance Frequency of Origami-Inspired Vibration Isolators With Quasi-Zero-Stiffness Characteristic","authors":"Kouya Yamaguchi, Sachiko Ishida","doi":"10.1115/detc2020-22171","DOIUrl":"https://doi.org/10.1115/detc2020-22171","url":null,"abstract":"This study aims to design two types of vibration isolators, with different spring mechanisms, using a foldable structure that is based on a cylinder torsional buckling pattern, and evaluate the vibration isolation performance of each design. Vibration isolation is achieved through nonlinear spring characteristics of the isolators, which have zero spring stiffness, achieved by attaching a linear spring to the foldable isolator structure. The two vibration isolators differ in the mechanical elements that constitute the foldable structure, which undergo tensile forces as the structure folds. For the first isolator, the mechanical elements are represented only by tension springs, which appropriately undergo tension. For the second isolator, the mechanical elements are designed so that embedded compression springs within the elements compress under tension, thus enabling the elements to work as tension springs. The excitation experiment results revealed that the different spring mechanisms produced equivalent resonance frequencies but different damping effects at the resonance and higher frequencies. When oscillations with multiple amplitudes were input, larger input amplitudes were found to correspond to lower resonance frequencies for both isolators. This trend contradicts that described in the nonlinear vibration theory modeled by the Duffing equation, and was determined to be caused by hysteresis of the spring phenomena in the vibration isolators.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"82 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":"115581440","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

Tooth Meshing Estimation Based on Monitoring Rotational Vibration and Infrared Thermography Image of Hypoid Gear 基于准双曲面齿轮旋转振动监测和红外热成像图像的齿啮合估计

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22140

Ren Yamashita, K. Mukaiyama, Hiroki Sakuda, S. Matsui, T. Hirogaki, E. Aoyama

{"title":"Tooth Meshing Estimation Based on Monitoring Rotational Vibration and Infrared Thermography Image of Hypoid Gear","authors":"Ren Yamashita, K. Mukaiyama, Hiroki Sakuda, S. Matsui, T. Hirogaki, E. Aoyama","doi":"10.1115/detc2020-22140","DOIUrl":"https://doi.org/10.1115/detc2020-22140","url":null,"abstract":"\u0000 Nowadays, the improvement in Noise Vibration Harshness (NVH) is one of the most important issues for meeting the needs of the user in the automobile industry. It is well-known that the tooth surface accuracy significantly influences the vibration in gear meshing. The hypoid gear used in the automobile differential has a complex shape, and estimation of the contact conditions is difficult. Therefore, we attempt to develop a novel method to analyze the tooth contact conditions by using highly sensitive infrared thermography with a high response; this method acts as a noncontact analysis that is based on monitoring the temperature distribution during meshing between the pinion and the gear surface. In this report, we designed three types of hypoid gears with different offsets to observe changes in the meshing phenomenon, which occurred due to the differences in the offset. Moreover, by employing accelerometers during a driving test, the dynamic behavior was also examined. Simultaneously, a tooth contact analysis was carried out using thermography. Consequently, the relationship between the rise in temperature at the tooth contact area and the tendency of the rotational vibration was elucidated.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"86 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":"131293560","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

Experimental Modal Analysis of Business Jet Fuselage Tail Section Sub-Assemblies 公务机机身尾段组件试验模态分析

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22314

Ian Donaldson, C. Mechefske

引用次数: 2

Effects of Correlated Noise on the Performance of Persistence Based Dynamic State Detection Methods 相关噪声对基于持久性的动态状态检测方法性能的影响

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22592

J. Tempelman, Audun D. Myers, J. Scruggs, Firas A. Khasawneh

引用次数: 1

Natural Frequency Based Topology Optimization of an Aircraft Engine Support Frame 基于固有频率的飞机发动机支撑架拓扑优化

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22286

Braden T Warwick, C. Mechefske, I. Kim

{"title":"Natural Frequency Based Topology Optimization of an Aircraft Engine Support Frame","authors":"Braden T Warwick, C. Mechefske, I. Kim","doi":"10.1115/detc2020-22286","DOIUrl":"https://doi.org/10.1115/detc2020-22286","url":null,"abstract":"\u0000 The multi-stage design space refinement (MSDSR) technique increases the likelihood of convergence of topology optimization (TO) with large volume fraction constraints. This work considers MSDSR TO of an aircraft engine support frame with a natural frequency-based objective function. The problem statement maximized the first natural frequency, effectively maximizing the stiffness to mass ratio of the frame. The problem statement considered natural frequency constraints, which eliminated all natural frequencies within 5% of the engine excitation frequency times a safety factor of two. The design space did not consider the initial geometry; therefore, allowing for the determination of the optimal stiffener location on the initial geometry. The results of this work increased the first natural frequency of the engine support frame by 25.9%, eliminated all natural frequencies within 11.3% of the engine excitation frequency, and added only 0.253 kg of mass to the frame. The results of this work further demonstrate the advantages of MSDSR TO and the impact that it can have on the aerospace industry. Specifically, the design space considered in this work allows for the structural reinforcement of a pre-existing design, which is easier to implement and easier to regulate than similar results from the literature.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"81 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":"127312290","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

Some Exploration of the Path-Dependence in the Contact Analysis 接触分析中路径依赖性的若干探讨

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22439

Gaurav Chauda, D. Segalman

{"title":"Some Exploration of the Path-Dependence in the Contact Analysis","authors":"Gaurav Chauda, D. Segalman","doi":"10.1115/detc2020-22439","DOIUrl":"https://doi.org/10.1115/detc2020-22439","url":null,"abstract":"\u0000 One of the most frustrating features of joint mechanics is that all the important processes take place precisely where they cannot be seen or measured directly — the interface between contacting bodies. In order to achieve some insight into the mechanisms that give rise to the nonlinearities of joints one naturally turns to analytic or numerical models of interface mechanics. With such models, one can explore the significance of different assumptions of kinematics or surface mechanics and compare those with laboratory experiments on the integrated joints.\u0000 Among the limitations of such modeling strategies are the twin problems of 1) employing suitable models for friction and 2) solving the resulting equations. There is evidence that the commonly used Coulomb friction model is inconsistent with the experimentally observed behavior of lap joints; it is necessary to explore the use of more complex models. Additionally, even when computing contact and sliding with the relatively simple Coulomb friction model, capturing the evolution of traction fields from one load set to the next in a physically plausible manner has been a continuing challenge. Obtaining fidelity to such path dependence for more complex models would be consequently more difficult. This issue has motivated the research reported here on the source of the difficulty in modeling path-dependent contact and possible solutions.\u0000 A two-parameter Coulomb friction model is used to test a conventional contact algorithm and a newer one devised specifically to capture path dependence correctly. The evolution of lateral traction during cyclic loading is used to illustrate how the shear traction distribution at each load step evolves from that of the previous.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"11 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":"116813595","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

Superharmonic Resonance of Third Order of Electrostatically Actuated MEMS Circular Plates: Effect of AC Frequency on Voltage Response 三阶静电驱动MEMS圆片的超谐波谐振:交流频率对电压响应的影响

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22130

Julio Beatriz, D. Caruntu

引用次数: 0

Analysis of High Fidelity Modeling of Drone Dynamics and Aerodynamics for Reduced Energy Consumption 面向降低能耗的无人机动力学与空气动力学高保真建模分析

Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB) Pub Date : 2020-08-17 DOI: 10.1115/detc2020-22481

S. Hoang, L. Marsh, A. Aliseda, I. Shen

{"title":"Analysis of High Fidelity Modeling of Drone Dynamics and Aerodynamics for Reduced Energy Consumption","authors":"S. Hoang, L. Marsh, A. Aliseda, I. Shen","doi":"10.1115/detc2020-22481","DOIUrl":"https://doi.org/10.1115/detc2020-22481","url":null,"abstract":"\u0000 This paper studies the effect of rotor blade aerodynamics and rotor grouping on the accuracy of open-loop simulations with respect to generated trajectories and energy consumption for multi-rotor drones. To examine these effects an 18-rotor high performance drone carrying a 30 kg payload is used. The effect of the rotor blade aerodynamic model on simulation results is examined by comparing roll, pitch, yaw, and vertical motion trajectories produced when using blade element theory model with trajectories produced when using a lumped blade model. The results show a 20% difference between the maximum roll and pitch angle achieved, a 58% difference in maximum altitude achieved, and a 91% percent difference in the maximum yaw angle achieved. These results indicate that the choice of aerodynamic model for the rotor blades has a significant effect on the simulated trajectories and in the calculated energy consumption of those trajectories. The effect of rotor groupings on energy consumption is examined by comparing two different rotor groupings for the 18-rotor drone. Roll, pitch, and yaw motions are simulated for both groupings and the resulting energy calculation shows a 4–5% difference in energy with a motor efficiency curve and a 8–9% difference with a motor efficiency curve included in the power calculation. These results indicate that rotor grouping is important in over-actuated drones for reducing the overall energy consumption of the drone, and thus increase its endurance. This energy reduction may become especially important when closing the loop with a control system or in extreme flight conditions such as stall or strong gusts.","PeriodicalId":398186,"journal":{"name":"Volume 7: 32nd Conference on Mechanical Vibration and Noise (VIB)","volume":"46 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":"121960399","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