Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control最新文献_第2页

Quasi-Static Curve Negotiation Analysis of Railway Vehicle Considering Nonlinear Air Suspension LV and DPV Flow Characteristics 考虑非线性空气悬架LV和DPV流特性的轨道车辆准静态曲线通过分析

Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control Pub Date : 2019-11-25 DOI: 10.1115/detc2019-97936

Takayuki Tanaka, H. Sugiyama

{"title":"Quasi-Static Curve Negotiation Analysis of Railway Vehicle Considering Nonlinear Air Suspension LV and DPV Flow Characteristics","authors":"Takayuki Tanaka, H. Sugiyama","doi":"10.1115/detc2019-97936","DOIUrl":"https://doi.org/10.1115/detc2019-97936","url":null,"abstract":"\u0000 Accurate prediction of vehicle curve negotiation performance is critically important for evaluation of railway vehicle safety. Although multibody dynamics vehicle simulation has been widely utilized for the vehicle performance evaluation, nonlinearities associated with the air suspension behavior are vastly simplified and the air mass flows of the leveling valve (LV) and differential pressure valve (DPV) are neglected in many cases. It is, however, known that changes in the air spring pressure caused by the LV and DPV make a non-negligible impact on the vertical wheel load variation and the derailment safety in small radius curved tracks. Therefore, this paper presents a numerical procedure for the analysis of the coupled vehicle and air suspension system behavior, considering nonlinearities associated with LV and DPV flow characteristics. To enable quick and accurate prediction of the history-dependent LV-induced wheel load unbalance and its impact on the derailment safety, quasi-static vehicle motion solvers for the fully coupled vehicle and air spring system flow equations are developed. Several numerical examples are presented to demonstrate the simulation capabilities developed in this study and numerical results are validated against the test data.","PeriodicalId":338372,"journal":{"name":"Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124997486","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

Interface Models for Multirate Co-Simulation of Nonsmooth Multibody Systems 非光滑多体系统多速率联合仿真的界面模型

Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control Pub Date : 2019-11-25 DOI: 10.1115/detc2019-98098

Albert Peiret, J. Kövecses, F. González, M. Teichmann

{"title":"Interface Models for Multirate Co-Simulation of Nonsmooth Multibody Systems","authors":"Albert Peiret, J. Kövecses, F. González, M. Teichmann","doi":"10.1115/detc2019-98098","DOIUrl":"https://doi.org/10.1115/detc2019-98098","url":null,"abstract":"\u0000 Co-simulation techniques enable the coupling of physically diverse subsystems in an efficient and modular way. Complex engineering applications can be simulated in co-simulation setups, in which each subsystem is solved and integrated using numerical methods tailored to its physical behaviour. Co-simulation implies that the communication between subsystems takes place at discrete-time instants and is limited to a given set of coupling variables, while the internals of each subsystem are generally not accessible to the rest of the simulation environment. In non-iterative co-simulation schemes, this may lead to the instability of the integration. Increasingly demanding requirements in the simulation of machinery have led to the coupling, in real-time co-simulation setups, of multibody models of mechanical systems to computational representations of non-mechanical subsystems, such as hydraulics and electronics. Often, these feature faster dynamics than their mechanical counterparts, which leads to the use of multirate integration in non-iterative co-simulation environments. The stability of the integration in these cases can be enhanced using interface models, i.e., reduced representations of the multibody system, to provide meaningful input values to faster subsystems between communication points. This work describes such interface models that can be used to represent nonsmooth mechanical systems subjected to unilateral contact and friction.","PeriodicalId":338372,"journal":{"name":"Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128031354","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

Singularities in Axisymmetric Vectoring Exhaust Nozzle and a Feasible Singularity-Free Approach 轴对称矢量喷管中的奇异性及一种可行的无奇异方法

Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control Pub Date : 2019-11-25 DOI: 10.1115/detc2019-98122

Li Yu-tong, Wang Yu-xin

引用次数: 0

Computing Poincaré-Lyapunov Constants via Carleman Linearization 用Carleman线性化方法计算poincar<s:1> - lyapunov常数

Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control Pub Date : 2019-11-25 DOI: 10.1115/detc2019-98413

Csanád Árpád Hubay, T. Kalmár-Nagy

引用次数: 1

Examining the Effect of Friction During Dry Sliding on Select Thermoplastics 研究干滑动过程中摩擦对选定热塑性塑料的影响

Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control Pub Date : 2019-11-25 DOI: 10.1115/detc2019-98403

Adam Madison, Kyle Koren, Elisabeth Kames, Beshoy Morkos

{"title":"Examining the Effect of Friction During Dry Sliding on Select Thermoplastics","authors":"Adam Madison, Kyle Koren, Elisabeth Kames, Beshoy Morkos","doi":"10.1115/detc2019-98403","DOIUrl":"https://doi.org/10.1115/detc2019-98403","url":null,"abstract":"\u0000 This paper outlines a preliminary case study which examines the effect of friction on select thermoplastics during high load, low velocity, and dry sliding wear applications. The primary factors investigated were temperature increase, mass loss, and surface condition of the material. The goal of this research is to identify the best material choice for this application. Eight different thermoplastics were observed in this study. The thermoplastics include variations of polyethylene (PE), polyamide (Nylon), and polytetrafluoroethylene (PTFE). An overarching goal of this study is to develop a standard wear property table for the select thermoplastics, as they are not readily available like material property tables for other materials.\u0000 The results obtained show that the temperature of the materials generally increased over time, with some materials experiencing greater temperature increase than others. The PTFE materials exhibited the most substantial material loss while the PE materials had the highest increase in temperature during the testing period. Most Nylon composites generated noise during testing, with the exception of one variant: Bearing Grade Nylon. After all factors were considered, Bearing Grade Nylon was chosen for the aforementioned application due to its negligible mass loss, minor surface damage, and temperature increase relative to other thermoplastics tested throughout all trials.","PeriodicalId":338372,"journal":{"name":"Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control","volume":"253 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133207083","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

The Study of Magnetorheological Elastomer Based on Natural Rubber (NR)/Thermoplastic Elastomer SEBS Hybrid Matrix: Experimental and Numerical Simulation 基于天然橡胶/热塑性弹性体SEBS混合基体的磁流变弹性体研究:实验与数值模拟

Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control Pub Date : 2019-11-25 DOI: 10.1115/detc2019-98296

Xincheng Song, Wenju Wang, Fufeng Yang, Guoping Wang, X. Rui

{"title":"The Study of Magnetorheological Elastomer Based on Natural Rubber (NR)/Thermoplastic Elastomer SEBS Hybrid Matrix: Experimental and Numerical Simulation","authors":"Xincheng Song, Wenju Wang, Fufeng Yang, Guoping Wang, X. Rui","doi":"10.1115/detc2019-98296","DOIUrl":"https://doi.org/10.1115/detc2019-98296","url":null,"abstract":"\u0000 Magnetorheological elastomers (MREs) is one kind of smart materials which is mainly made up of matrix materials and magnetic particles, their mechanical properties can be controlled under an external magnetic field. Applications of MREs are limited as a result of their poor MR effect and mechanical performance, so enhancing MR effect of MREs are critical for their application. This study aimed to fabricate MREs with high MR effect, the thermoplastic elastomer styrene-ethylene butylene-styrene triblockcopolymer (SEBS) was added into natural rubber (NR) and physical blending technology was used to fabricate hybrid matrix based MREs. The results of dynamic mechanical analysis showed that, with the addition of SEBS, zero modulus of MREs increased from 0.50 MPa to 0.64 MPa and MR effect increased from 28.00% to 43.75%. The multiphase model in ANSYS software was adopted to analysis the process of physical blending. The numerical simulation result showed that it was more easy to mix matrix evenly with the increase of volume fraction of SEBS.","PeriodicalId":338372,"journal":{"name":"Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132740181","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

Numeric Approach on Optimal Control for the Path Following System in Autonomous Vehicle 自动驾驶汽车路径跟踪系统最优控制的数值方法

Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control Pub Date : 2019-11-25 DOI: 10.1115/detc2019-97518

Huyao Wu, B. Ran

引用次数: 0

Modal Analysis to Interpret Localization Phenomena of Harmonic Oscillations in Nonlinear Oscillator Arrays 非线性振子阵列谐波局域现象的模态分析

Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control Pub Date : 2019-11-25 DOI: 10.1115/detc2019-97780

Y. Harata, T. Ikeda

{"title":"Modal Analysis to Interpret Localization Phenomena of Harmonic Oscillations in Nonlinear Oscillator Arrays","authors":"Y. Harata, T. Ikeda","doi":"10.1115/detc2019-97780","DOIUrl":"https://doi.org/10.1115/detc2019-97780","url":null,"abstract":"\u0000 This paper investigates localization phenomena in a nonlinear array with N Duffing oscillators connected by weak, linear springs when the array is subjected to harmonic excitation. In the theoretical analysis, the equations of motion are derived for: (1) the physical coordinate system, and (2) modal coordinate system. The modal equations of motion form an autoparametric system, i.e., the excitation acts directly on the first mode of vibration, and the other modes are indirectly excited because they are nonlinearly coupled with the first mode. Van der Pol’s method is employed to obtain the solutions of the harmonic oscillations, and then the expressions of the frequency response curves are given. In the numerical calculations, the frequency response curves of the amplitudes and phase angles in the cases of N = 2 and 3 are presented. The frequency response curves, obtained in the modal coordinate system, demonstrate that localization phenomena occur in the physical coordinate system when multiple vibrational modes simultaneously appear. When imperfections exist in the N Duffing oscillators, the modal equations of motion do not form an autoparametric system because the external excitation directly acts on all modes. Instead, internal resonances may occur in such systems.","PeriodicalId":338372,"journal":{"name":"Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117080491","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

Dynamic Modelling and Diagnosis of Transverse Crack and Rotor/Stator Rub in a Flexible Rotor System 柔性转子系统横向裂纹和转子/定子摩擦的动力学建模与诊断

Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control Pub Date : 2019-11-25 DOI: 10.1115/detc2019-97047

R. Vashisht, Q. Peng

{"title":"Dynamic Modelling and Diagnosis of Transverse Crack and Rotor/Stator Rub in a Flexible Rotor System","authors":"R. Vashisht, Q. Peng","doi":"10.1115/detc2019-97047","DOIUrl":"https://doi.org/10.1115/detc2019-97047","url":null,"abstract":"\u0000 Due to unbalance present in a rotating machinery, fluctuating stresses are generated leading to the formation of transverse cracks in rotors. The cracks propagate with the passage of time and increase the amplitude of vibration. High vibration amplitudes can give rise to rotor/stator rubs. During the rubbing phase, the crack propagation gets enhanced due to inter-connected nature of these faults. If left unattended, these faults can cause the premature failure of machine components. Hence, there is a need to develop fault detection mechanisms based on the vibration response so that these faults can be diagnosed during initial stages. The effect of gravity and the presence of cracks significantly changes vibration characteristics of the rotor, which is thoroughly investigated in this research for a two-degrees-of-freedom Jeffcott rotor. It has been observed that during rubbing, high harmonics are excited. These harmonics are integer multiple of the rotor spin frequency. Similar type of the response is also observed due to the presence of a transverse rotor crack. It is difficult to distinguish the type of faults based on the steady state dynamic response only. Instead of working only on a steady state vibration response, the transient vibration response during coasting up of the rotor is considered. During coasting up of the rotor, high harmonics are excited for both the crack as well as rotor/stator rubbing. The excitation of higher harmonics starts at much earlier in the spectrogram of the vertical response for the cracked rotor compared to that of rubbing. This fact is used in the development of a fault diagnosis technique based on Short Time Fourier Transform of the vibration response. The proposed technique can efficiently distinguish different types of faults even if multiple faults coexist.","PeriodicalId":338372,"journal":{"name":"Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126545543","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

Periodic Control in a Stick Balancing Problem 棍平衡问题的周期控制

Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control Pub Date : 2019-11-25 DOI: 10.1115/detc2019-97979

L. Bencsik, T. Insperger

{"title":"Periodic Control in a Stick Balancing Problem","authors":"L. Bencsik, T. Insperger","doi":"10.1115/detc2019-97979","DOIUrl":"https://doi.org/10.1115/detc2019-97979","url":null,"abstract":"\u0000 Understanding the human balancing is a fundamental question. Investigation of simple tasks can help in this challenging problem. In order to describe the nature of the underlying control mechanism, first of all, the balancing force has to be determined. As a second step one can identify the behaviour of the controller. There are two main problems in the model of the whole control process of balancing, time-delay is unknown and the exact mathematical definition of the control goal is also not known. The explanation for this latter issue the classical inverted pendulum model has 2DoF but only one control forces exists, thus it can be handled as a typical underactuated mechanical system. In under-actuated systems the task of inverse dynamics is not well defined. Some degrees-of-freedom cannot directly be controlled, and the corresponding generalized coordinates depend on the system dynamics only. In this study we model the control mechanism as a time periodically (i.e. clock-driven) switched controller. We investigate the stability properties of the closed-loop system. We show a periodically switched controlled which can be a possible model of human balancing.","PeriodicalId":338372,"journal":{"name":"Volume 6: 15th International Conference on Multibody Systems, Nonlinear Dynamics, and Control","volume":"259 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114668975","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