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Power Flow Response Based Dynamic Topology Optimization of Bi-material Plate Structures

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Chinese Journal of Mechanical Engineering 2013年第3期26卷 620-628页

作者： XUE Xiaoguang LI Guoxi xiong yeping GONG Jingzhong School of Mechatronic Engineering and Automation National University of Defense Technology Faculty of Engineering and the Environment University of Southampton

Work on dynamic topology optimization of engineering structures for vibration suppression has mainly addressed the maximization of eigenfrequencies and gaps between consecutive eigenfrequencies of free vibration, minimization of the dynamic compliance subject to forced vibration, and minimization of the structural frequency response. A dynamic topology optimization method of bi-material plate structures is presented based on power flow analysis. Topology optimization problems formulated directly with the design objective of minimizing the power flow response are dealt with. In comparison to the displacement or velocity response, the power flow response takes not only the amplitude of force and velocity into account, but also the phase relationship of the two vector quantities. The complex expression of power flow response is derived based on time-harmonic external mechanical loading and Rayleigh damping. The mathematical formulation of topology optimization is established based on power flow response and bi-material solid isotropic material with penalization(SIMP) model. Computational optimization procedure is developed by using adjoint design sensitivity analysis and the method of moving asymptotes(MMA). Several numerical examples are presented for bi-material plate structures with different loading frequencies, which verify the feasibility and effectiveness of this method. Additionally, optimum results between topological design of minimum power flow response and minimum dynamic compliance are compared, showing that the present method has strong adaptability for structural dynamic topology optimization problems. The proposed research provides a more accurate and effective approach for dynamic topology optimization of vibrating structures.

关键词： dynamic topology optimization power flow response bi-material plate structures

WELD ROOT MAGNIFICATION FACTORS FOR SEMI-ELLIPTICAL CRACKS IN T-BUTT JOINTS

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Acta Mechanica Solida Sinica 2013年第3期26卷 317-330页

作者： Zhanxun Song yeping xiong Jilong Xie Jing Tang Xing School of Mechanical Electronic & Control EngineeringBeijing Jiaotong University Faculty of Engineering & the Environments Fluid-Structure Interaction Research GroupUniversity of Southampton

Many researchers have focused their efforts on fatigue failures occurring on weld toes. In recent years, more and more fatigue failures occur on weld roots. Therefore, it is important to explore the behaviour of weld root fatigues. This paper investigates numerically the Magnification factors （Mk） for types of semi-elliptical cracks on the weld root of a T-butt joint. The geometry of the joint is determined by four important parameters： crack depth ratio, crack shape ratio, weld leg ratio and weld angle. A singular element approach is used to generate the corresponding finite element meshes. For each set of given four parameters of the semi-elliptical root crack, the corresponding T-butt joint is numerically simulated and its Mk at the deepest point of the weld root crack is obtained for the respective tension and shear loads. The variation range of the four parameters covers 750 cases for each load, totaling 1500 simulations are completed. The numerical results obtained are then represented by the curve to explore the effects of four parameters on the Mk. To obtain an approximate equation representing Mk as a function of the four parameters for each load, a multiple regression method is adopted and the related regression analysis is performed. The error distributions of the two approximate equations are compared with the finite element data. It is confirmed that the obtained approximate functions fit very well to the database from which they are derived. Therefore, these two equations present a valuable reference for engineering applications in T-butt joint designs.

关键词： welded root cracks singular element method stress intensity factors magnificationfactors multiple regressions

Nonlinear Dynamics Seismic Response of Container Crane Based on Contact Friction Theory

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仪器仪表学报 2013年第S1期34卷 147-152页

作者： Wang Dong Wang Gongxian xiong yeping Li Zhe School of Logistic Engineering Wuhan University of Technology Faculty of Engineering and the Environment University of Southampton

To evaluate the dynamic behavior of a container crane under seismic loads accurately,the contact state between the wheels and the rails or the ground that significantly affect the seismic response of the structure must be considered *** paper has proposed a modeling method based on the theory of contact and friction for simulating the nonlinear seismic response of large and flexible structure of a jumbo movable container crane,including the contact problem regarding the wheels attached to the bottom of its legs and the rails on which they *** models are used to perform extensive dynamic time-history analysis in order to find out their nonlinear dynamic behavior under various excitation *** is found that the presented numerical modeling method simulates the nonlinear seismic response of a container crane quite ***,it can verify and expand our understanding of the seismic behaviors by evaluating response performance for the large seaport cranes.

关键词： container crane seismic response fem analysis contact and friction model

OPTIMUM CONTROL OF VIBRATION AND STRUCTURE－BORNE NOISE FOR MACHINERY ON FLEXIBLE FOUNDATION

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Chinese Journal of Mechanical Engineering 1996年第1期9卷 13-20页

作者： xiong yeping Song Kongjie Wang Chun ( Shandong University of Technology)

Faced with the key problems of machinerv- induced vibration and structure-borne noise when dynamic machines are mounted on flexible foundations such as upper floors of facto- ry buildings, the vibration and noise transmission mechanism and optimal control for the flexible system are systematically studied by the novel approach of power flow. A more general system of machinery-isolators一flexible foundation is modelled. Based on substructure transfer matrix tech- nique the power flow input and transmitted are formulated in closed forms, and the effects that the flexibility of foundation and the asymmetricity of system have upon the power flow transmis- sion spectra are revealed, Also the inverse problems of isolation design are discussed by using an optimum method. Optimum design for a typical example about a force fan mounted on a con- crete building floor is successfully performed to show that the model is practical, the theory and the optimisation developed are reasonable and effective. Thereby, theoretical bases for accurate prediction of isolation effectiveness and an optimum method for practical design of a general flexi- ble isolation system are provided.

关键词： Power flow Structure-borne nosie Flexible subsystems Optimum control

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汽车悬架同步振动抑制与能量收集综述与展望

机械工程学报 2022年第20期58卷 3-26页

作者：陈仲生曹军义秦朝烨陈志文 xiong yeping 常州工学院汽车工程学院常州213032 西安交通大学机械工程学院西安710048 清华大学机械工程系北京100084 湖南工业大学电气与信息工程学院株洲417002 南安普顿大学工程和物理科学学院英国南安普顿SO167QF

悬架是汽车中的核心关键部件,具有承载和减振的双重功能。传统的悬架系统采用黏性液体或干摩擦阻尼器将振动能量转化为热量耗散出去实现减振,造成能量浪费,这尤其对新能源汽车不利。近十年来,既能抑制振动又能收集电能的新型悬架系统受... 详细信息

悬架是汽车中的核心关键部件,具有承载和减振的双重功能。传统的悬架系统采用黏性液体或干摩擦阻尼器将振动能量转化为热量耗散出去实现减振,造成能量浪费,这尤其对新能源汽车不利。近十年来,既能抑制振动又能收集电能的新型悬架系统受到了高度关注和广泛研究。为了全面掌握汽车悬架同步振动抑制与能量收集技术领域的最新进展,回顾汽车悬架的发展历程,总结汽车悬架从路面激励中可收集的振动能量,重点梳理汽车能量回收悬架技术研究现状,探讨当前面临的技术挑战并对未来发展方向进行了展望。该研究有助于国内同行快速准确地掌握本领域的技术现状,有望为国内新型汽车悬架技术的发展提供重要参考。

关键词：汽车悬架同步振动抑制与能量收集能量回收悬架展望

Power flow transmission influenced by vibration source impedance for a compound system

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Chinese Journal of Acoustics 1996年第4期15卷 314-318页

作者： xiong yeping SONG Konajie and HUO Rui(Institute of Engineerng Mechanics, Shandong Univerity of Technology Jinan 250061)

In this paper we present the effect of vibration source on the power flow transmission in a compound flexible system. Considering the internal impedance of the source, a general model is here proposed, and the generalized transfer equations of the system and the closed form solutions for power flow in the fiexible system are then developed, with which the effects of the source characteristics on power flow transmission are discussed. The investigation shows that when the source and receiver impedances are comparable, substantial error can occur in the power flow estimation if the source is assumed to be an ideal constant force source (CFS)or a constant velocity source (CVS).

关键词： Vibration source Power flow Flexible foundation

Optimal Design of a Ship Multitasking Cabin Layout Based on the Interval Optimization Method

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Journal of Marine Science and Application 2021年第4期20卷 723-734页

作者： Haonan Li Yuanhang Hou Wei Chen Tu Yu Yulong Hu yeping xiong Naval Architecture and Ocean Engineering College DalianMaritime UniversityDalian 116026China Faculty of Engineering and Physical Sciences Universityof SouthamptonBoldrewood Innovation CampusSouthampton SO167QFUK China Ship Development and Design Center Wuhan 430000China

Searching for the optimal cabin layout plan is an efective way to improve the efciency of the overall design and reduce a ship’s operation *** multitasking states of a ship involve several statuses when facing diferent missions during a voyage,such as the status of the marine supply and emergency *** human fow and logistics between cabins will change as the state *** ideal cabin layout plan,which is directly impacted by the above-mentioned factors,can meet the diferent requirements of several statuses to a higher *** deviations exist in the quantifcation of human fow and ***,uncontrollability is present in the fow situation during actual *** coupling of these deviations and uncontrollability shows typical uncertainties,which must be considered in the design ***,it is important to integrate the demands of the human fow and logistics in multiple states into an uncertainty parameter *** research considers the uncertainties of adjacent and circulating strengths obtained after quantifying the human fow and *** numbers are used to integrate them,a two-layer nested system of interval optimization is introduced,and diferent optimization algorithms are substituted for solving *** comparison and analysis of the calculation results with deterministic optimization show that the conclusions obtained can provide feasible guidance for cabin layout scheme.

关键词： Cabin layout Multitasking states Uncertainty parameters Interval optimization Human fow and logistics

Hydrodynamic Performance Analysis of a Submersible Surface Ship and Resistance Forecasting Based on BP Neural Networks

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Journal of Marine Science and Application 2022年第2期21卷 34-46页

作者： Yuejin Wan Yuanhang Hou Chao Gong Yuqi Zhang Yonglong Zhang yeping xiong Naval Architecture and Ocean Engineering College Dalian Maritime UniversityDalian 116026China Faculty of Engineering and Physical Sciences University of SouthamptonBoldrewood Innovation CampusSO167QF SouthamptonUK

This paper investigated the resistance performance of a submersible surface ship(SSS)in different working cases and scales to analyze the hydrodynamic performance characteristics of an SSS at different speeds and diving depths for engineering ***,a hydrostatic resistance performance test of the SSS was carried out in a towing ***,the scale effect of the hydrodynamic pressure coefficient and wave-making resistance was *** differences between the three-dimensional real-scale ship resistance prediction and numerical methods were ***,the advantages of genetic algorithm(GA)and neural network were combined to predict the resistance of *** propagation neural network(BPNN)and GA-BPNN were utilized to predict the SSS *** also studied neural network parameter optimization,including connection weights and thresholds,using K-fold *** results showed that when a SSS sails at low and medium speeds,the influence of various underwater cases on resistance is not obvious,while at high speeds,the resistance of water surface cases increases sharply with an increase in *** improving the weights and thresholds through K-fold cross-validation and GA,the prediction results of BPNN have high consistency with the actual *** research results can provide a theoretical reference for the optimal design of the resistance of SSS in practical applications.

关键词： Submersible surface ship K-fold cross-validation Scale effect Genetic algorithm BP neural network

Power flow in the coupled dynamic system of machinery and building floor

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Chinese Journal of Acoustics 1996年第1期15卷 73-80页

作者： xiong yeping Song K.J. and Wang C.(Institute o, Engineerng Medanics, Sandong University of Technology, Jinan, 250014)

The transmision mechanism of vibrational power flow in the complex flekible coupled system of machinery mouned on a multi-storey plant building via isolators are studied in this paper from the viewpoint of energy. In view of practical isolation designs in engineering,an asymmetric isolation system with mtiltiple isolators on a fiekible foundation is modeled, in which the interactions between the machine and the floor, and among different mouating points are taken illto account. Moreover, the transmission characteristics of power flow in the system concerned are analyzed with the use of subsystem mobility synthetic techaique. Further more,the power flow spectra of the asymmetric system are calculated and compared with those of symmetric one to reveal the effects of asymmetricity and system parameters on the power ***, new approaches to the control of structural vibration and acoustics for this kin of problems are proposed.

关键词： Power flow High frequency isolation Flexible system Asymmetricity