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A rigid-flexible coupling finite element model of coupler for analyzing train instability behavior during collision
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作者 Jingke Zhang Tao Zhu +5 位作者 Bing Yang Xiaorui Wang Shoune Xiao Guangwu Yang Yanwen Liu Quanwei Che 《Railway Engineering Science》 2023年第4期325-339,共15页
Rail vehicles generate huge longitudinal impact loads in collisions.If unreasonable matching exists between the compressive strength of the intermediate coupler and the structural strength of the car body,the risk of ... Rail vehicles generate huge longitudinal impact loads in collisions.If unreasonable matching exists between the compressive strength of the intermediate coupler and the structural strength of the car body,the risk of car body structure damage and train derailment will increase.Herein,a four-stage rigid-flexible coupling finite element model of the coupler is established considering the coupler buckling load.The influence of the coupler buckling load on the train longitudinal-vertical-hori-zontal buckling behavior was studied,and the mechanism of the train horizontal buckling instability in train collisions was revealed.Analysis results show that an intermediate coupler should be designed to ensure that the actual buckling load is less than the compressive load when the car body structure begins to deform plastically.The actual buckling load of the coupler and the asymmetry of the structural strength of the car body in the lateral direction are two important influencing factors for the lateral buckling of a train collision.If the strength of the two sides of the car body structure in the lateral direction is asymmetrical,the deformation on the weaker side will be larger,and the end of the car body will begin to deflect under the action of the coupler force,which in turn causes the train to undergo sawtooth buckling. 展开更多
关键词 Intermediate coupler rigid-flexible coupling finite element model Design buckling load Actual buckling load Lateral buckling instability
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Ride comfort evaluation for road vehicle based on rigid-flexible coupling multibody dynamics 被引量:11
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作者 Guangqiang Wu Guodong Fan Jianbo Guo 《Theoretical & Applied Mechanics Letters》 CAS 2013年第1期39-43,共5页
In the present research two different whole vehicle multibody models are established respectively, including rigid and rigid-flexible coupling multibody vehicle models. The former is all composed by rigid bodies while... In the present research two different whole vehicle multibody models are established respectively, including rigid and rigid-flexible coupling multibody vehicle models. The former is all composed by rigid bodies while in the later model, the flexible rear suspension is built based on the finite element method (FEM) and mode superposition method, in which the deformations of the components are considered. The ride simulations with different speeds are carried out on a 3D digitalized road, and the weighted root mean square (RMS) of accelerations on the seat surface,backrest and at the feet are calculated. The comparison between the responses of the rigid and rigid-flexible coupling multibody models shows that the flexibility of the vehicle parts significantly affects the accelerations at each position, and it is necessary to take the flexibility effects into account for the assessment of ride comfort. C 2013 The Chinese Society of Theoretical and Applied Mechanics. [doi: 10.1063/2.1301304] 展开更多
关键词 ride comfort rigid-flexible coupling multibody system
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Complete geometric nonlinear formulation for rigid-flexible coupling dynamics 被引量:4
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作者 刘铸永 洪嘉振 刘锦阳 《Journal of Central South University》 SCIE EI CAS 2009年第1期119-124,共6页
A complete geometric nonlinear formulation for rigid-flexible coupling dynamics of a flexible beam undergoing large overall motion was proposed based on virtual work principle, in which all the high-order terms relate... A complete geometric nonlinear formulation for rigid-flexible coupling dynamics of a flexible beam undergoing large overall motion was proposed based on virtual work principle, in which all the high-order terms related to coupling deformation were included in dynamic equations. Simulation examples of the flexible beam with prescribed rotation and free rotation were investigated. Numerical results show that the use of the first-order approximation coupling (FOAC) model may lead to a significant error when the flexible beam experiences large deformation or large deformation velocity. However, the correct solutions can always be obtained by using the present complete model. The difference in essence between this model and the FOAC model is revealed. These coupling high-order terms, which are ignored in FOAC model, have a remarkable effect on the dynamic behavior of the flexible body. Therefore, these terms should be included for the rigid-flexible dynamic modeling and analysis of flexible body undergoing motions with high speed. 展开更多
关键词 flexible beam rigid-flexible coupling dynamic modeling numerical simulation
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Rigid-Flexible Coupling Dynamic Analysis of Sub-Launched Vehicle During the Vertical Tube-Exit Stage 被引量:3
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作者 Weiyao Zhang Jingbo Gao Cong Wang 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2015年第2期26-33,共8页
During the launching stage,hydrodynamic pressure and adapters' reaction loads can influence the vehicle's rigid motion as well as cause its structural vibration,which is a typical rigid-flexible coupling dynam... During the launching stage,hydrodynamic pressure and adapters' reaction loads can influence the vehicle's rigid motion as well as cause its structural vibration,which is a typical rigid-flexible coupling dynamic problem. This paper presents a 2-D rigid-flexible coupling model to calculate the vehicle's dynamic responses in that period.The vehicle was equivalent to a flexure beam with axial deformation. Hybrid coordinate and modal superposition methods were used to describe its large rigid displacement and small deformation. By the second Lagrange equation,the vehicle centroid's displacements,rotational angle and modal coordinates were chosen as generalized coordinates and then the vehicle 's rigid-flexible coupling dynamic equations were obtained. By numerical simulation,the results of vehicle's motion parameters and transverse internal loads were acquired.The calculation results showed that differences of the vehicle's motion parameters between the rigid-flexible coupling model and the rigid body assumption are noticeable and the peak magnitude of the vehicle's transverse internal loads in the rigid-flexible coupling model is higher remarkably than that in the rigid body assumption. 展开更多
关键词 sub-launched vehicle rigid-flexible coupling hybrid coordinate dynamic responses
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Dynamic Simulation for Rigid-Flexible Coupling Model of Gear Transmission System Based on ADAMS 被引量:1
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作者 陈材 石全 +1 位作者 王广彦 戈洪宇 《Journal of Donghua University(English Edition)》 EI CAS 2016年第2期192-195,共4页
The influence of the flexible body for the motion of gear transmission system is analyzed and the foundation for a more accurate assessment of gear transmission system is established when it has battle damage faults. ... The influence of the flexible body for the motion of gear transmission system is analyzed and the foundation for a more accurate assessment of gear transmission system is established when it has battle damage faults. By using Pro / E software,the virtual prototype model of gear transmission system in the speed reducer is established,and the rigid model and rigid-flexible coupling model are simulated respectively in ADAMS to obtain the data of gear meshing force. It can be concluded that rigid-flexible coupling model can reflect the real motion better than rigid model by comparing the simulation data of two models. 展开更多
关键词 ADAMS gear transmission rigid-flexible coupling SIMULATION
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Nonlinear dynamic analysis on rigid-flexible coupling system of an elastic beam 被引量:1
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作者 Feiyun Zhao Jinyang Liu Jiazhen Hong 《Theoretical & Applied Mechanics Letters》 2012年第2期68-71,共4页
Previous work examined the effect of the attached stiffness matrix terms on stability of an elastic beam undergoing prescribed large overall motion. The aim of the present work is to extend the nonlinear formulations ... Previous work examined the effect of the attached stiffness matrix terms on stability of an elastic beam undergoing prescribed large overall motion. The aim of the present work is to extend the nonlinear formulations to an elastic beam with free large overall motion. Based on initial stress method, the nonlinear coupling equations of elastic beams are obtained with free large overall motion and the attached stiffness matrix is derived by solving sub-static formulation. The angular velocity and the tip deformation of the elastic pendulum are calculated. The analytical results show that the simulation results of the present model are tabled and coincide with the one-order approximate model. It is shown that the simulation results accord with energy conservation principle. 展开更多
关键词 elastic beam nonlinear analysis initial stress method rigid-flexible coupling
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An analysis on a rigid-flexible coupling system of an oscillating massand a rotating disk
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作者 Jian Liu Kai Zhang Zhanfang Liu 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2022年第5期341-348,共8页
A mass-rod-disk system consisting of an oscillating mass attached to a rigid rotating disk by an elastic rod is designed to study rigid-flexible coupling mechanism.Suppose the rod is lightweight and has enough stiffne... A mass-rod-disk system consisting of an oscillating mass attached to a rigid rotating disk by an elastic rod is designed to study rigid-flexible coupling mechanism.Suppose the rod is lightweight and has enough stiffness,the theorems of linear momentum and angular momentum are applied to the mass-rod-disk system based on the kinematic description of the system.With respect to two deflections of the mass and one angular velocity of the system,a group of nonlinear differential equations are established where the tangential inertial force,centrifugal force,Coriolis force as well as the moments of additional inertial forces take important effects on the dynamic response.For the sake of description,these three types of inertial forces mentioned before are referred to as additional inertial forces in this paper.The horizontal deflections of the mass and the angular velocity of the disk rotating about a fixed-axis are numerically solved for the prescribed external torque.The oscillating trajectory of the mass is deeply influenced by the additional inertial forces,meanwhile the dynamic fluctuations of the angular velocity and rotary inertia of the system are strongly affected by the mass oscillation. 展开更多
关键词 rigid-flexible coupling Additional inertial forces Nonlinear differential equation Motion trajectory
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基于DEM-MBD耦合的液压挖掘机动力学仿真分析 被引量:1
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作者 刘畅 黄笛 +1 位作者 曹超 牟象东 《机床与液压》 北大核心 2024年第5期180-185,共6页
在实际工况下,液压挖掘机工作装置受到的载荷较大且具有强时变性,因此工作装置各组成杆件及液压缸较易出现各种形式的失效。针对以上问题,选取某型号液压挖掘机作为研究对象,根据液压挖掘机工作装置实际挖掘物料工况,利用多体动力学软件... 在实际工况下,液压挖掘机工作装置受到的载荷较大且具有强时变性,因此工作装置各组成杆件及液压缸较易出现各种形式的失效。针对以上问题,选取某型号液压挖掘机作为研究对象,根据液压挖掘机工作装置实际挖掘物料工况,利用多体动力学软件ADAMS建立液压挖掘机虚拟样机模型并利用离散元软件EDEM建立物料模型。通过DEM-MBD耦合仿真分析方法,对液压挖掘机工作装置进行动力学仿真分析,主要获取挖掘物料过程中铲斗受力变化曲线、不同时刻铲斗受力云图,通过对其分析,能够获取铲斗在挖掘作业过程中受力变化情况,为铲斗的有限元分析、优化设计提供理论依据。 展开更多
关键词 液压挖掘机 动力学仿真 铲斗 DEM-mbd耦合仿真
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基于DEM-MBD的油茶林分层切抛式开沟刀组研制 被引量:1
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作者 曾熠 蒋啸虎 +3 位作者 吴明亮 赵智豪 唐乐为 黎鹏程 《农业工程学报》 EI CAS CSCD 北大核心 2024年第8期30-42,共13页
针对油茶种植林地土壤粘重板结环境下因刀片剧烈冲击导致开沟效果不理想、功率消耗较大和机具振动的问题,该研究设计了一种油茶林分层切抛式开沟刀组。根据油茶开沟施肥的农艺要求,分析土壤与切土刀片间的相互作用、建立土壤颗粒在抛土... 针对油茶种植林地土壤粘重板结环境下因刀片剧烈冲击导致开沟效果不理想、功率消耗较大和机具振动的问题,该研究设计了一种油茶林分层切抛式开沟刀组。根据油茶开沟施肥的农艺要求,分析土壤与切土刀片间的相互作用、建立土壤颗粒在抛土刀面上的动力学微分方程,得到影响刀组切抛性能的关键因素为偏心系数、最大工作半径r1处滑切角、安装角和刀轴转速。通过EDEM-RecurDyn耦合仿真,以作业功耗与沟深稳定性系数为评价指标进行单因素及二次正交旋转组合试验,基于NSGA-Ⅲ算法对构建的二阶多项式响应面模型进行循环逼近优化,确定最优参数组合为:偏心系数1.3、最大工作半径r1处滑切角64.7°、安装角55.1°、刀轴转速301 r/min,与对照组单一外层切土刀和正装抛土刀的组合方式相比,最优参数组合下分层切抛式开沟刀组的扭矩波动降低率为21.53%。田间试验结果表明,最优参数刀组下仿真与田间试验的作业功耗、沟深稳定性系数相对误差分别为10.25%和4.55%,验证了耦合仿真模型的准确性;田间试验的作业功耗与沟深稳定性系数分别为25.96 kW和88.31%,比功耗和现有的果园开沟刀组相比降低了8.31%,沟深稳定性系数满足国家相关标准的技术要求,研究结果可为油茶林开沟刀组的设计和优化提供理论支撑与参考。 展开更多
关键词 农业机械 仿真 DEM-mbd耦合 油茶林 开沟刀组 分层切抛
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A Study of Dynamic Analysis Method for the Rigid-Flexible Coupled Bar Linkage System 被引量:1
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作者 陆念力 张广芸 《Journal of Donghua University(English Edition)》 EI CAS 2011年第6期616-620,共5页
In order to present a dynamic analysis method for the rigid-flexible coupled bar linkage system(RFCBLS),the flexible element motion equation was gotten by Lagrange Equation and the rigid element motion equation was go... In order to present a dynamic analysis method for the rigid-flexible coupled bar linkage system(RFCBLS),the flexible element motion equation was gotten by Lagrange Equation and the rigid element motion equation was gotten based on rigid constraint conditions.The multi-body system(MBS) is a complex mechanism and its components have quite different rigidities.If it is considered as a rigid MBS(RMBS) to do its dynamic analysis,elastic deformation's ignorance will lead to inaccurate analysis.If it is considered as a flexible MBS(FMBS) to establish,analyze,and solve the model,quite large system equations make it difficult to solve.The better method is as follows:the complex mechanism system is regarded as a rigid-flexible coupled system(RFCS) to make dynamic characteristic of rigid components be equivalent,system equation is established by FMBS' way,and system equation dimensions are reduced by transition matrices' introduction.A dynamic analysis method for rigid element and flexible element coupling was presented based on the FMBS.The analyzed crank slide-block mechanism results show that the dynamic analysis method for RFCBLS is quick and convenient. 展开更多
关键词 rigid-flexible coupled linkage system flexible element rigid element transition matrices dynamic analysis
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Numerical simulation of aircraft arresting process with an efficient full-scale rigid-flexible coupling dynamic model
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作者 Haoyuan SHAO Daochun LI +3 位作者 Zi KAN Lanxi BI Zhuoer YAO Jinwu XIANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第5期586-602,共17页
The arresting process of carrier-based aircraft is widely recognized as a challenging task,characterized by the highest accident rate among all carrier-based aircraft operations.Dynamic simulation plays a crucial role... The arresting process of carrier-based aircraft is widely recognized as a challenging task,characterized by the highest accident rate among all carrier-based aircraft operations.Dynamic simulation plays a crucial role in assessing the intricate responses of the arresting process,favoring the design of carrier-based aircraft.An efficient and accurate rigid-flexible coupling model for analyzing the dynamic response of the arresting process is proposed.By combining the dynamic characteristics of airframe,landing gear,arresting hook and arresting gear system,the rigid-flexible coupling dynamic model is established to reflect the relative motion of the coupling parts and arresting load.The dynamic model is verified through simulations of landing gear landing drops and by comparing the arresting simulation results with corresponding data in the US military standard.Additionally,simulations of the arresting process under different off-center distance and aircraft yaw angle are conducted to obtain the dynamic response of the aircraft during the arresting process.The result indicates that the rigid-flexible coupling dynamic model proposed is effective for analyzing the arresting dynamics response of carrier-based aircraft.The axial force of the arresting cable on both sides of the hook engagement point,pitch and yaw angle of aircraft are inconsistent under yaw and off-center arresting.The analysis method and obtained results provide valuable references for assessing the dynamic responses of carrier-based aircraft during arresting process and offer valuable in-sights in the design of carrier-based aircraft. 展开更多
关键词 Carrier-based aircraft Deck landing rigid-flexible coupling dynamic model Finite element method Dynamic analysis
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MODEL OF CENTRIFUGAL EFFECT AND ATTITUDEMANEUVER STABILITY OF A COUPLEDRIGID-FLEXIBLE SYSTEM
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作者 李智斌 王照林 +1 位作者 王天舒 柳宁 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2005年第5期594-603,共10页
The influences of nonlinear centrifugal force to large overall attitude motion of coupled rigid-flexible system was investigated. First the nonlinear model of the coupled rigid-flexible system was deduced from the ide... The influences of nonlinear centrifugal force to large overall attitude motion of coupled rigid-flexible system was investigated. First the nonlinear model of the coupled rigid-flexible system was deduced from the idea of “centrifugal potential field', and then the dynamic effects of the nonlinear centrifugal force to system attitude motion were analyzed by approximate calculation; At last, the Lyapunov function based on energy norm was selected, in the condition that only the measured values of attitude and attitude speed are available, and it is proved that the PD feedback control law can ensure the attitude stability during large angle maneuver. 展开更多
关键词 coupled rigid-flexible system nonlinear rigid-body motion elastic vibration attitude stability
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基于DEM-MBD对履带车辆在不同颗粒尺寸砂地行驶性能分析
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作者 徐鹏 武宇 宋丽军 《中国工程机械学报》 北大核心 2024年第1期118-122,127,共6页
为研究地面颗粒尺寸大小对履带车辆行驶性能的影响,利用DEM-MBD耦合软件对履带车辆行驶进行仿真,地面条件设置为砂地,并结合履带-地面力学对仿真结果进行分析。对履带车辆行驶偏移和沉陷量分析,得出砂地颗粒尺寸越大,履带行驶偏移量越大... 为研究地面颗粒尺寸大小对履带车辆行驶性能的影响,利用DEM-MBD耦合软件对履带车辆行驶进行仿真,地面条件设置为砂地,并结合履带-地面力学对仿真结果进行分析。对履带车辆行驶偏移和沉陷量分析,得出砂地颗粒尺寸越大,履带行驶偏移量越大,沉陷量越少。本文可为履带车辆优化设计提供基础。 展开更多
关键词 砂地 履带车辆 行驶性能 动力学仿真 DEM-mbd耦合
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基于DEM-MBD耦合的链勺式人参精密排种器研究 被引量:22
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作者 赖庆辉 贾广鑫 +3 位作者 苏微 赵立军 邱小宝 吕勤 《农业机械学报》 EI CAS CSCD 北大核心 2022年第3期91-104,共14页
人参播种中存在因人参种子形状不规则、流动性差,种子在播种前需进行催芽处理,催芽的种子易损伤,造成充种困难、易伤种等问题,为此设计一种链勺式人参精密排种器。通过对充种过程中种子受力情况和运动状态的分析,阐明倾斜充种可提高充... 人参播种中存在因人参种子形状不规则、流动性差,种子在播种前需进行催芽处理,催芽的种子易损伤,造成充种困难、易伤种等问题,为此设计一种链勺式人参精密排种器。通过对充种过程中种子受力情况和运动状态的分析,阐明倾斜充种可提高充种性能的机理;通过对携种过程的理论计算和力学分析,并基于DEM-MBD耦合的单因素仿真试验,分析了不同排种链条的张紧力、不同排种器结构参数和工作参数对其工作性能的影响,确定了链勺式排种器的结构参数;以主动链轮转速、充种倾角和种层高度为试验因素,以充种的单粒率(1粒/勺)、复充率(≥2粒/勺)、漏充率(0粒/勺)为试验指标,基于DEM-MBD耦合进行了二次回归正交旋转组合仿真试验。结果表明:影响单粒率的主次顺序为充种倾角、主动链轮转速、种层高度;当充种倾角为71.73°、主动链轮转速为79.10 r/min、种层高度为84.28 mm时,充种性能最佳,单粒率为95.68%、复充率为3.57%、漏充率为0.75%;为验证排种器的工作性能,进行了台架试验,结果表明链勺式人参精密排种器的工作性能较好,满足我国非林地人参种植的播种要求。 展开更多
关键词 人参 链勺式 精密排种器 DEM-mbd耦合
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月球车与月壤交互作用的离散元-多体动力学耦合建模
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作者 徐鸿 雷波 刘锦阳 《振动与冲击》 EI CSCD 北大核心 2024年第4期239-249,共11页
目前,对于散体颗粒物质与复杂机械系统的耦合作用研究,面临着跨尺度、计算规模庞大以及非光滑表面的接触检测困难等问题。为了探究月球车与月壤交互作用,首先对颗粒-多体耦合系统动力学建模与接触算法进行研究。分别用离散元方法(discre... 目前,对于散体颗粒物质与复杂机械系统的耦合作用研究,面临着跨尺度、计算规模庞大以及非光滑表面的接触检测困难等问题。为了探究月球车与月壤交互作用,首先对颗粒-多体耦合系统动力学建模与接触算法进行研究。分别用离散元方法(discrete element method, DEM)和多体动力学(multibody dynamics, MBD)笛卡尔方法建立了散体球形颗粒和含约束多体系统的动力学模型,并基于Hertz-Mindlin模型计算颗粒与刚体的接触力,在此基础上给出顺序耦合策略,建立了离散元和多体耦合的动力学模型。针对月球车齿状车轮的非光滑表面与颗粒之间接触检测规模庞大的问题,提出了非光滑形状物体的分区域局部检测方法,降低了局部检测的规模。通过对比圆柱体冲击颗粒的试验和仿真结果,验证了离散元-多体耦合模型的准确性。在耦合动力学建模和接触算法研究的基础上,对具有齿状车轮的月球车在月壤上行驶过程进行动力学仿真,研究不同驱动参数下的系统动力学特性以及不同轮胎形状对行驶运动的影响,研究结果表明,交错形轮齿的月球车相较直齿形轮齿前进距离多14%,前进效率较高,该研究对月球车的设计具有理论指导意义。 展开更多
关键词 离散元方法(DEM) 多体动力学(mbd) 月球车 耦合建模 高效接触检测
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Effect of Rigid Pitch Motion on Flexible Vibration Characteristics of a Wind Turbine Blade
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作者 Zhan Wang Liang Li +3 位作者 Long Wang Weidong Zhu Yinghui Li Echuan Yang 《Energy Engineering》 EI 2024年第10期2981-3000,共20页
Adynamic pitch strategy is usually adopted to improve the aerodynamic performance of the blade of awind turbine.The dynamic pitch motion will affect the linear vibration characteristics of the blade.However,these infl... Adynamic pitch strategy is usually adopted to improve the aerodynamic performance of the blade of awind turbine.The dynamic pitch motion will affect the linear vibration characteristics of the blade.However,these influences have not been studied in previous research.In this paper,the influences of the rigid pitch motion on the linear vibration characteristics of a wind turbine blade are studied.The blade is described as a rotating cantilever beam with an inherent coupled rigid-flexible vibration,where the rigid pitch motion introduces a parametrically excited vibration to the beam.Partial differential equations governing the nonlinear coupled pitch-bend vibration are proposed using the generalized Hamiltonian principle.Natural vibration characteristics of the inherent coupled rigid-flexible system are analyzed based on the combination of the assumed modes method and the multi-scales method.Effects of static pitch angle,rotating speed,and characteristics of harmonic pitch motion on flexible natural frequencies andmode shapes are discussed.It shows that the pitch amplitude has a dramatic influence on the natural frequencies of the blade,while the effects of pitch frequency and pith phase on natural frequencies are little. 展开更多
关键词 Pitch motion wind turbine blade inherent rigid-flexible coupling vibration characteristics
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Study on the interactive deformation of bone needles and circum-pelvic soft tissue
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作者 ZHANG Famin LEI Jingtao 《High Technology Letters》 EI CAS 2024年第3期297-303,共7页
During the robot-assisted pelvic fracture reduction,the needle-tissue interactive deformation characteristic is not clear,which affects the accuracy of robotic surgery.In this paper,a layered rig-id-flexible coupling ... During the robot-assisted pelvic fracture reduction,the needle-tissue interactive deformation characteristic is not clear,which affects the accuracy of robotic surgery.In this paper,a layered rig-id-flexible coupling model is proposed,and the needle-tissue interactive deformation under the load-ing is analyzed by the Rayleigh-Ritz method,in accordance with the principle of minimum potential energy.The pelvic musculoskeletal tissue is reversely reconstructed,and the structure of the bone is segmented into cancellous bone and cortical bone.The Mooney-Rivlin five-parameter hyperelastic model is used to simulate muscle,and the Ogden hyperelastic model is used to simulate adipose tis-sue.Finite element simulation is performed by loading different magnitudes of forces.The accuracy of the rigid-flexible coupling model is 0.432 mm,which indicates the correctness of the needle-tis-sue interactive deformation theory analysis. 展开更多
关键词 pelvic fracture reduction rigid-flexible coupling needle-tissue interactive de-formation
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基于EDEM仿真的溜槽防冲击研究
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作者 王细平 姚艳萍 《起重运输机械》 2024年第1期31-35,共5页
为减小溜槽下落煤炭对下部承载设备的冲击,文中设计一种具有防冲击结构的新型溜槽,该结构具有减速轮和减速挡板2个减速装置,可以快速降低煤炭运行速度,减小下落煤炭冲击力,采用Solidworks建立溜槽的三维模型,通过EDEM-MBD耦合建立了不... 为减小溜槽下落煤炭对下部承载设备的冲击,文中设计一种具有防冲击结构的新型溜槽,该结构具有减速轮和减速挡板2个减速装置,可以快速降低煤炭运行速度,减小下落煤炭冲击力,采用Solidworks建立溜槽的三维模型,通过EDEM-MBD耦合建立了不同煤炭在溜槽中的动态过程,以Hertz-Mindlin接触模型对不同煤炭下落过程进行了数值模拟分析,得到不同煤炭在下落过程中的速度和冲击力变化曲线,验证了防冲击结构的合理性。 展开更多
关键词 防冲击溜槽 EDEM-mbd耦合 煤炭冲击力 仿真模型
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纵轴式掘进机行驶性能及履带力学特性研究
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作者 井庆贺 刘杰 +3 位作者 孟鹏飞 肖运智 王福奇 王彬 《中国工程机械学报》 北大核心 2024年第5期588-593,共6页
为提高纵轴式掘进机在巷道内的行驶性能,以天河科技EBZ200M-4型掘进机为研究对象,分析履带板与底板之间的力学性能,并结合EDEM、RecurDyn和Ansys软件对其行驶性能与履带力学特性进行仿真分析。结果表明:由于两侧履带张紧力不同,掘进机在... 为提高纵轴式掘进机在巷道内的行驶性能,以天河科技EBZ200M-4型掘进机为研究对象,分析履带板与底板之间的力学性能,并结合EDEM、RecurDyn和Ansys软件对其行驶性能与履带力学特性进行仿真分析。结果表明:由于两侧履带张紧力不同,掘进机在3 mm颗粒模型行驶向左侧偏移,在5和7 mm颗粒模型行驶向右偏移,但行驶偏移量范围均在5~6 mm之间,相差不大。掘进机在7 mm颗粒模型的下沉量最小,为16 mm。C型履带板沉陷量为14.6 mm,侧向载荷标准差为138.3 N,相比于传统A型履带板抗侧滑能力提升了22.1%,应力最大值为79.9 MPa,平均值为2.8 MPa,变形最大值为0.027 mm,平均值为0.006 5 mm。由此可知,掘进机在颗粒尺寸为7 mm模型下的行驶性能最佳,且将传统A型履带板更改为C型履带板后可进一步提高掘进机的行驶性能,为其性能优化提供一定参考。 展开更多
关键词 纵轴式掘进机 行驶性能 DEM-mbd耦合
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Design and implementation of rigid-flexible coupling for a half-flexible single jack nozzle 被引量:10
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作者 Chen Pengfei Wu Feng +2 位作者 Xu Jinglei Feng Xudong Yang Qiao 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2016年第6期1477-1483,共7页
The aerodynamic design of a rigid-flexible coupling profile is the decisive factor for the flow-field quality of a supersonic free jet wind tunnel nozzle, and its mechanic dynamic features are the key for engineering ... The aerodynamic design of a rigid-flexible coupling profile is the decisive factor for the flow-field quality of a supersonic free jet wind tunnel nozzle, and its mechanic dynamic features are the key for engineering implementation of continuous Mach number regulations. To fulfill the requirements of a free jet inlet/engine compatibility test within a wide simulation envelop, both uniform flow-fields of continuous acceleration and deceleration are necessary. In this paper, the aerodynamic design methods of an expansion wall and machinery implementation plan for the halfflexible single jack nozzle were researched. The profile control in nozzle flexible plate design was studied with a rigid-flexible coupling method. Design and calculations were performed with the help of numerical simulation. The technique of axial free stretching of the flexible plate was used to improve the matching performance between the designed elasticity profile and the theoretical one, and the rigid-flexible coupling structure was calibrated by wind tunnel tests. Results indicate that the flexible plate aerodynamic design method used here is effective and feasible. Via rigidflexible coupling design, the flexible plate agrees with the rigid body very well, and continuous Mach number changes can be achieved during the tests. The nozzle’s exit flow-field uniformity meets the requirements of China Military Standard(GJB). 展开更多
关键词 Aerodynamic profile Flow-field quality Free jet NOZZLE rigid-flexible coupling Variable Mach number Wind tunnel
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