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Contact Problems at Micro/Nano Scale with Surface Tension 微/纳米尺度下表面张力的接触问题
Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.03.035
Jianmin Long , Yue Ding , Gangfeng Wang
{"title":"Contact Problems at Micro/Nano Scale with Surface Tension","authors":"Jianmin Long ,&nbsp;Yue Ding ,&nbsp;Gangfeng Wang","doi":"10.1016/j.piutam.2017.03.035","DOIUrl":"10.1016/j.piutam.2017.03.035","url":null,"abstract":"<div><p>When contact radius reduces to micro or nano scale, the influence of surface tension becomes important. In this paper, we summarize some of our works in this subject. Based on the solution of a point force acting on an elastic half space with surface tension, we consider the indentation on an elastic half space by rigid cylinder and sphere, respectively. The explicit relations of load depending on contact radius and indent depth are presented. Through a finite element approach accounting for surface energy, we verify the equivalence of the compression of an elastic sphere and the indentation of a half space, even with the presence of surface tension. Furthermore, we address the influence of surface tension on adhesive contact, and give the explicit expressions of contact radius and indent depth. These works are useful to accurately characterize the contact problems at micro and nano scale.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"21 ","pages":"Pages 40-47"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.03.035","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55245707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Fundamentals of Continuous Growth Processes in Technology and Nature 技术和自然持续增长过程的基本原理
Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.06.001
Alexander V. Manzhirov , Narinder K. Gupta
{"title":"Fundamentals of Continuous Growth Processes in Technology and Nature","authors":"Alexander V. Manzhirov ,&nbsp;Narinder K. Gupta","doi":"10.1016/j.piutam.2017.06.001","DOIUrl":"10.1016/j.piutam.2017.06.001","url":null,"abstract":"<div><p>Fundamentals of mathematical modeling of surface growth process are under consideration. Mathematical models of 3D and 2D solids that grow owing to processes of continuous influx of new elements (surfaces and fibers) are proposed. Complete systems of equations and boundary value problems are obtained. A method for solving these boundary value problems is developed. Qualitative conclusions and numerical results concerning the behavior of growing solids are presented.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"23 ","pages":"Pages 1-12"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.06.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55245857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Delay Robustness and Compensation in L1 Adaptive Control L1自适应控制中的延迟鲁棒性与补偿
Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.08.003
Kim-Doang Nguyen , Harry Dankowicz
{"title":"Delay Robustness and Compensation in L1 Adaptive Control","authors":"Kim-Doang Nguyen ,&nbsp;Harry Dankowicz","doi":"10.1016/j.piutam.2017.08.003","DOIUrl":"10.1016/j.piutam.2017.08.003","url":null,"abstract":"<div><p>Stability analysis of an L1 adaptive control design decomposes into i) the derivation of an inequality condition imposed on a filter in the control channel that guarantees transient performance bounds on the state and control input for a theoretical nonadaptive reference system, and ii) a Lyapunov-type proof of the decay of a predictor error as the inverse square root of the adaptive gain, which in turn can be made arbitrarily large without sacrificing robustness to time delay in the control input. This paper reviews</p><p>recent results on the robustness to input and communication time delays for L1 control systems with uncertain nonlinearities and in nontrivial network configurations, as well as a possible scheme for compensating for large, constant input delays.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"22 ","pages":"Pages 10-15"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55247127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Hardware-in-the-loop Experiments in Presence of Delay 存在延迟的硬件在环实验
Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.08.005
Zsolt Veraszto, Gabor Stepan
{"title":"Hardware-in-the-loop Experiments in Presence of Delay","authors":"Zsolt Veraszto,&nbsp;Gabor Stepan","doi":"10.1016/j.piutam.2017.08.005","DOIUrl":"10.1016/j.piutam.2017.08.005","url":null,"abstract":"<div><p>A widely used tool of engineering research and development is the hardware-in-the-loop (HIL) experiment. Instead of building the full prototype of a developed machine, only its most critical parts are constructed physically, while the rest of the machine is emulated by means of actuators, sensors, and digital control in between. If the mathematical model of the rest of the machine is available, the control unit provides a realistic environment for the physically constructed test part. The control, however, introduces digital effects into this system which is originally continuous. From dynamical view-point, the most relevant digital effects are the appearances of delay and zero-order-hold (ZOH). The paper compares the nonlinear dynamics of the real system and the one constructed by means of the HIL experiment. The two systems are compared from stability and nonlinear vibrations view-point in case of a brake system where stick-slip phenomenon occurs. The limitations of HIL experiments are identified by means of Hopf bifurcation calculations, numerical simulations and dynamic measurements carried out on the corresponding experimental test rig.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"22 ","pages":"Pages 24-30"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55247195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Attractive Domain of Nonlinear Systems with Time-delayed Feedback Control and Time-delay Effects 时滞反馈控制和时滞效应非线性系统的吸引域
Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.08.008
Yuan-Guang Zheng , Jian-Qiao Sun
{"title":"Attractive Domain of Nonlinear Systems with Time-delayed Feedback Control and Time-delay Effects","authors":"Yuan-Guang Zheng ,&nbsp;Jian-Qiao Sun","doi":"10.1016/j.piutam.2017.08.008","DOIUrl":"10.1016/j.piutam.2017.08.008","url":null,"abstract":"<div><p>The dynamics of system with time delay resides in an infinite dimensional state space. It is difficult to determine the domain of attraction of the steady state response in the infinite dimensional state space. A definition of the domain of attraction in the physical space is introduced, which is intuitive, and furthermore, it is numerically computable under the hypothesis that the time delay is short. The effect of time delay on the domain of attraction of the popular Duffing system is considered. It is found that the time delay has significant influence on the structure of domain of attraction. The width of attractive domain can be enlarged with a small time delay, however, the domain of attraction shrinks when the time delay increases and approach to the stability boundary.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"22 ","pages":"Pages 51-58"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55247336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Self-excited Oscillation for High-viscosity Sensing and Self-excited Coupled Oscillation for Ultra-senseitive Mass Sensing 高粘度传感的自激振荡和超灵敏质量传感的自激耦合振荡
Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.08.022
Hiroshi Yabuno
{"title":"Self-excited Oscillation for High-viscosity Sensing and Self-excited Coupled Oscillation for Ultra-senseitive Mass Sensing","authors":"Hiroshi Yabuno","doi":"10.1016/j.piutam.2017.08.022","DOIUrl":"10.1016/j.piutam.2017.08.022","url":null,"abstract":"<div><p>In the paper, we introduce the applications of self-excited oscillation to high-viscosity sensing and mass-sensing. Vibration-type sensing allows us to do the instantaneous and continuous measurements of changes in viscosity, mass and so on occurring with time. In the usual procedure, the external or forced excitation has been employed to the resonators. The viscosity sensing is carried out by using the change of the resonance amplitude in the frequency response curve, i.e., Q factor, depending on the viscosity. The mass sensing is carried out by using the shift of the resonance frequency corresponding to the natural frequency, depending on the mass. In order to realize the high-viscosity sensing and the mass-sensing in viscosity environments, we introduce the application of self-excited oscillation as an excitation method.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"22 ","pages":"Pages 216-220"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55247597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Galerkin Approximations for Thermoacoustic Instability in a Rijke's Tube Rijke管中热声不稳定性的伽辽金近似
Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.08.023
Shanti Swaroop Kandala, Abhivamshi Maduri, C.P. Vyasarayani
{"title":"Galerkin Approximations for Thermoacoustic Instability in a Rijke's Tube","authors":"Shanti Swaroop Kandala,&nbsp;Abhivamshi Maduri,&nbsp;C.P. Vyasarayani","doi":"10.1016/j.piutam.2017.08.023","DOIUrl":"10.1016/j.piutam.2017.08.023","url":null,"abstract":"<div><p>A simple mathematical model for thermoacoustic instability (TAI) in a Rijke's tube results in a first-order neutral delay differential equation (NDDE). In this work, the NDDE governing the TAI is converted to a partial differential equation (PDE) and then into a system of ordinary differential equations (ODEs) using Galerkin approximations. A new pseudo inverse method, is proposed to handle the boundary conditions in the Galerkin method. The stability results obtained using our method are validated using the data from the literature.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"22 ","pages":"Pages 168-175"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55247680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Delayed State Feedback Control for Milling Process 铣削过程的延迟状态反馈控制
Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.08.015
Xinhua Long, Song Ren, Pingxu Zheng
{"title":"Delayed State Feedback Control for Milling Process","authors":"Xinhua Long,&nbsp;Song Ren,&nbsp;Pingxu Zheng","doi":"10.1016/j.piutam.2017.08.015","DOIUrl":"10.1016/j.piutam.2017.08.015","url":null,"abstract":"<div><p>Dynamics of milling process is governed by a set of delay differential equations with periodic coefficients. The secondary Hopf bifurcation and period doubling bifurcation are two of main mechanisms which result into instability of the milling processes. This paper proposes a delayed state feedback controller through the discrete optimal control method to suppress the vibration of milling process. Numerical results reveal that the designed controller can suppress the vibrations of milling process efficiently as well as improve the stability of the cutting processes with the introduced time delay. The influence of designed time delay on control performance and robustness are also discussed.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"22 ","pages":"Pages 115-122"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55247819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Model Establishment and Parameter Analysis on Shimmy of Electric Vehicle with Independent Suspensions 独立悬架电动汽车摆振模型建立及参数分析
Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.08.034
Tian Mi , Gabor Stepan , Denes Takacs , Nan Chen , Ning Zhang
{"title":"Model Establishment and Parameter Analysis on Shimmy of Electric Vehicle with Independent Suspensions","authors":"Tian Mi ,&nbsp;Gabor Stepan ,&nbsp;Denes Takacs ,&nbsp;Nan Chen ,&nbsp;Ning Zhang","doi":"10.1016/j.piutam.2017.08.034","DOIUrl":"10.1016/j.piutam.2017.08.034","url":null,"abstract":"<div><p>In order to study the shimmy problem of the electric vehicle with independent suspensions, a 5 DoF model is established using the Lagrange Equation. Gyroscopic moment and tyre nonlinearity are both considered, and tyre-road constraint equations are derived on the non-slip assumption. Stability charts are conducted with the linearized model, while numerical simulation is also made so that these two methods can verify each other. The results show that bifurcation occurs at certain vehicle forward speed. Suspension structural parameters, such as caster angle, affect wheel shimmy. Furthermore, the presented model enables the analysis of any parameters in the system, and as an example, the influence of dampings on shimmy is investigated.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"22 ","pages":"Pages 259-266"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55248928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Convective Vector Wave Equation of Aeroacoustics 气动声学的对流矢量波动方程
Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.03.011
Yijun Mao , Zhiwei Hu
{"title":"Convective Vector Wave Equation of Aeroacoustics","authors":"Yijun Mao ,&nbsp;Zhiwei Hu","doi":"10.1016/j.piutam.2017.03.011","DOIUrl":"10.1016/j.piutam.2017.03.011","url":null,"abstract":"<div><p>This paper extends the vector wave equation of aeroacoustics to consider the effect of uniform flow. Analytical time-domain and frequency-domain acoustic velocity integral formulations for the monopole source are deduced. Test cases for sound radiated from stationary and rotating sources in uniform flow are carried out to validate the developed acoustic velocity formulations.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"20 ","pages":"Pages 81-88"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.03.011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55244635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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