Simulation and Optimization of Amplitude-adjusting Performance of Crane with Virtual Prototyping Technology

In the design of crane,designers often have to study the trajectory of amplitude-adjusting of crane.The tradition- al methods,illustration and analytics both show their limits.In this paper,the simulation of process of amplitude-adjusting is presented and the optimization is also performed with virtual prototyping technology.From the comparison of original solution and optimal solution,the effectiveness of this technique is testified.On the platform ADAMS/View,the interactive optimization can be performed in a visual,intuitive and credible way,which deserves to be introduced to the design of crane.

Modeling and simulation of ocean mining subsystem based on virtual prototyping technology

According to the virtual prototyping technology and the theory of dynamics of multi-rigid-body system, a virtual prototyping of ocean mining vehicle was constructed by using 3-dimensional entity modeling software ((Pro/E),) automatic dynamic analysis of mechanical systems(ADAMS) and advanced visual software(AVS). After 32 new modules were developed with C++ at AVS platform, the interface problems of the 3 types of software were solved effectively and a visual environment for ocean mining subsystem was constructed. Based on the similarity (theory) and similarity experiments, the validity and reliability of the virtual prototyping were verified. By using the (constructed) virtual prototyping, the relevant parameters, such as cutting depth, rotation speed of roller,marching speed of mining vehicle can be adjusted one by one. After repeatable virtual tests and analysis its corresponding dynamic characteristics, the structure parameter of mining vehicle and the parameter of mining process can be optimized fast and accurately. The experiment and simulation results show that, under the controlled mining parameters, 4 function expressions between the average force of single pick,average torque,average cutting power,energy consumption ratio and cutting depth are obtained. The maximum force of a single pick is less than (11090N) and the maximum torque of the roller is less than 3600N·m.

Simulation of Vertical Planetary Mill Based on Virtual Prototyping

The mechanical model of vertical planetary mill is set up, whose dynamic and kinetic characteristics are described as well. Based on the analysis of system dynamics of vertical planetary mill, virtual prototyping technology is applied in the simulation of this mill. The development of virtual prototype of equipment, virtual test and optimization of virtual prototype are stated in detail. Some useful conclusions which have theoretical meaning for the manufacturing of vertical planetary mill have been obtained. Furthermore, it is pointed out that virtual prototyping technology shows great advantage and is bound to become a main method of developing product in the future.

Control Performance Evaluation of Serial Urology Manipulator by Virtual Prototyping

Prostatic hyperplasia and tumor are common diseases,and the minimally invasive surgery inserting the instruments through the urethra into the prostate is commonly conducted.Taking the robotic manipulator for such surgery into consideration,this paper analyses the workspace of the end effector,and proposes the distribution error of the fixed point and the tracking error of manipulator end effector on the cone bottom surface of the workspace as the basis for control implementation of the manipulator.The D-H coordinate system of the manipulator is established and the trajectory planning of the end effector in the Cartesian space is carried out.The digital model was established,and dynamics simulation was performed in Solidworks and Matlab/Simulink environment to guide the manipulator design.Trajectory mapping and synchronization control between virtual model and the actual manipulator are realized based on digital twin technique.The virtual manipulator can reflect the real-time state of the manipulator with data interaction by comparing the dynamics simulation results with the motor current values obtained by experiment.Experiment was carried out with PD feedback control and Newton-Euler dynamics based feedforward control to get the trajectory tracking characteristic of each motor,errors of the fixed point and tracking performance of the end effector of the manipulator.The results show that compared with PD feedback control,feed forward control implementation can achieve a reduction of 30.0%in the average error of the fixed point of the manipulator and a reduction of 33.3%in the maximum error.

Study on co-simulation model of forging manipulator based on virtual prototyping

Based on the characteristics of integrated virtual prototype technology, the mechanical system sub-model, the hydraulic system sub-model and the control system sub-model of a forging manipula- tor system have been built using a variety of software, and a forging manipulator mtrltidisciplinary co- simulation model has been also built using a method of simulation models interface. Then the simu- lation and experiment are finished, and the result of the experiment is in good agreement with the re- sult of the simulation. It shows that the co-simulation model established can simulate accurately pa- rameter changes in real time during the moving of the forging manipulator such as displacement, ve- locity and pressure flow, which is of important significance for the optimized design of the forging manipulator system to establish the models.

Analysis of Robot Accuracy Assessed via its Joint Clearance by Virtual Prototyping Method

This paper discusses how joint clearance influences robot end effectorpositioning accuracy and a robot accuracy analysis approach based on a virtual prototype isproposed. First, a 5-DOF(Degree of freedom) neurosurgery robot was introduced. Then we built itsvirtual prototype, made movement planning and measured the manipulator tip accuracy, through whichthis robot accuracy portrait was obtained. Finally, in order to validate the robot accuracyanalysis approach which is based on a virtual prototype, the result was compared with that from amodel built by robot forward kinematics and robot differential kinematics. The robot accuracyanalysis approach presented in this paper gives a new way to enhance robot design quality , and helpto optimize the control and programming of the robot.

Development of a Special Machine Rotating Cutter Based on Virtual Prototyping

We first describe the fundamental concept of virtual prototyping（ VP ） technology and discuss the differences among VP, computer aided design, computer aided engineering and computer aided manufacture. Then we present the application flow of virtual prototyping technology to the development of mechanical products. Based on ADAMS/VIEW, a new kind of special machine rotating cutter has been developed. The simulation results show that the rotating cutter meets the design requirements. It is concluded that virtual prototyping technology is quite valuable in designing and manufacturing mechanical product.

Functional Virtual Prototyping in Vehicle Chassis Reform Analysis and Improvement Design

The contribution of functional virtual prototyping to vehicle chassis development is presented. The different topics that we took into consideration were reform analysis and improvement design during the vehicle chassis development. A frame of coordinates based on the digital-model was established, the main CAE analy- sis methods, multi-body system dynamics and finite element analysis were applied to the digital-model build by CAD/CAM software. The method was applied in the vehicle chassis reform analysis and improvement design, all the analysis and design projects were implemented in the uniform digital-model, and the development was carried through effectively.

Research of MMW radiometer virtual prototyping technology

The idea of millimeter-wave (MMW) radiometer virtual prototyping is discussed in this paper. Designing environment, designing method and the main modeling components of virtual MMW radiometer are researched. Important external parameters, which have significant influence to composing system, are used to components modeling, and then components are taken to buildup virtual MMW radiometer system. Moreover, the effect to output is contrasted whether there is a low-noise amplifier or not.

Dynamic simulation of hydrokinetic hammer based on virtual prototyping technology

This study presented the specified steps of comprehensively analyzing the hydraulic-driven hammer system with the application of the Virtual Prototype Technology.By comparing the simulation results with experimental phenomena and data,the correctness of simulation analysis conclusion is verified.Meanwhile,by means of its perfect visualization,the internal work process which can not be seen before is simulated.The mechanism of some abnormal phenomena encountered during the experiment is explained.

液压与气压传动综合探究性实验的设计

为解决传统实验教学过程中学生高阶能力培养不足的问题,设计了基于液压挖掘机的综合探究性实验。利用虚拟现实技术建立了液压挖掘机的虚拟样机,采用Multi-system 5060手持式液压测试仪、压力传感器、流量传感器等对挖掘机动作过程中的压力、流量、发动机转速进行实测。根据实测数据分析了执行元件的动作性能、压力冲击特性、压力损失特性等,完成了相关实验资源的建设,为引导学生设计及分析液压系统提供了理论和实测依据。在此基础上提出了实验实施方案,将实验分解为设备工况调研分析、回路设计、系统设计、实操优化4个环节,引导学生以小组协作的方式探究并解决真实的工程问题。

微电阻率扫描测井仪推靠系统运动精度可靠性分析

微电阻率扫描测井仪具有高井壁覆盖率、高分辨率、直观可视等特点,能够提高测井精度,尤其是在薄层识别上,能够进行清晰准确地判别。为研究微电阻率测井仪推靠系统运动精度可靠性,通过应用MATLAB和ADAMS两个软件,基于Monte-Carlo方法,针对推靠系统的极板、推杆支臂和相应杆件及间隙进行运动仿真,并进行运动精度可靠性分析。结果表明,推靠系统误差模型测量点位移变化比速度和加速度变化更加明显,位移变化对可靠性的影响比速度和加速度对可靠性的影响更大。应用MATLAB软件计算得出的运动精度可靠度为0.9830,应用ADAMS软件虚拟样机仿真得出的运动精度可靠度为0.9887。两种方法可靠度计算结果接近,误差为0.57%。

一种新型二级凸轮式分度机构动力学仿真

针对一种新型二级凸轮式分度机构的拓扑结构特点,在ADAMS软件环境下建立了机构动力学模型,分析机构的输出响应。在此基础上,研究了转速、惯性负载及针齿分度圆半径等因素对整机动态性能的影响规律。此外,分析了传动构件的针齿强度。结果表明:机构输出轴角速度值随着转速的提高而大幅度增加,随着针齿分度圆半径的增大而减小,其波动幅值随负载的增大而明显减小。机构分度期内针齿与凸轮间的动态啮合力显著波动,上述研究成果可为该类分度机构的工况参数选择原则提供一定的参考。

包覆面料裁片切割机横梁进给系统建模及动态特性分析

包覆面料裁片切割机是用于制作软体家具的主要设备之一,其横梁进给系统存在复杂的机电耦合作用。为在设计阶段研究其横梁进给系统切割定位工况下的动态特性,优化横梁进给伺服驱动控制系统参数,建立了横梁进给系统的机电-刚柔混合模型。拟定横梁进给系统的响应效率、定位精度和刀尖运动稳定性作为动态特性评价指标,探究了横梁进给伺服驱动控制系统参数对横梁进给系统动态特性的影响。结果表明:建立的横梁进给系统机电-刚柔混合模型,为横梁进给系统动态特性分析奠定了基础。增大位置环比例系数可提高横梁进给系统的响应效率和定位精度,增大速度环比例系数可有效提高横梁进给系统的刀尖运动稳定性。研究结果可为提高软体家具生产效率和制造质量提供技术保障。

含裂纹齿轮系统动力学建模及仿真研究

齿轮传动系统多采用细长轴,轴的柔性以及约束的施加会显著影响系统的动态响应,为了研究含齿轮裂纹故障的两级齿轮传动系统的振动特性,采用虚拟样机技术基于ADAMS分析软件对含齿轮裂纹故障的两级齿轮传动系统建立多体动力学模型,使用柔性支撑替换理想转动约束,分别建立系统的全刚体模型和全柔体模型,研究模型在相同工况下的动态响应,分析柔性轴、柔性齿对含裂纹轮齿的齿轮传动系统振动特性的影响;对健康齿轮传动系统建立多体动力学模型,将健康模型的结果与故障多体动力学模型的结果进行对照分析,探究裂纹对结果的影响。该研究可得到准确的含裂纹齿轮传动系统的振动特性,并验证在齿轮箱轴承处采用柔性支撑分析含裂纹故障的齿轮传动系统的可行性。

三相磁保持继电器的性能分析与优化设计

建立了三相磁保持继电器的虚拟样机模型,基于正交试验结果,使用BP神经网络与NSGA2遗传算法对继电器进行了优化设计。使用ANSYS和Adams/View分别建立三相磁保持继电器的静态和动态模型,进行了试验验证。以电磁系统部分结构的尺寸为变量,以分断电流值和吸合后的磁保持力矩为目标,进行五因素五水平正交试验,建立数据集;使用BP神经网络对数据集进行训练,分别得到两个优化目标的网络函数;使用NSGA2遗传算法对目标函数进行寻优并更新数据集,如此循环,直至最优解满足要求。动态特性仿真表明,优化后样机的分断时间减少了23.89%,吸合时间和弹跳时间分别减少了29.2%和47.05%,为样机的制造提供了参考。

基于VPANNs的掘进机回转台可靠性分析

以某型掘进机可靠性研究项目为依托,基于破岩机理,利用MATLAB编制了掘进机在不同横摆速度、截割位置角度下截割不同坚固性系数岩石的程序并生成载荷文本,在动力学仿真软件ADAMS中建立了掘进机截岩的虚拟样机模型,并对不同工况载荷下的模型进行了动态仿真。采用模糊方法拟合了掘进机回转台的可靠度隶属函数,以各工况参数及相应的可靠度隶属函数值作为训练样本,提出了一种将人工神经网络与虚拟样机技术相结合分析零件可靠性的新方法。结合神经网络的推理可以预测掘进机在新工况下工作时回转台的可靠度,预测均方误差达到了6.92×10-6,对实际生产具有一定的指导意义。

尾鳍驱动仿生机器鱼的CPG控制

随着人们对海洋资源关注度的增加,对仿生机器鱼的游动性能提出更高要求,为了使机器鱼游动更贴近真实鱼的游动效果,根据Light Hill的大摆幅细长体理论的鱼体波曲线对水下仿生机器鱼的游动模式进行了研究,并采用HOPF神经元振荡器模型建立非线性振荡器模型,运用最近相邻耦合关系构建了CPG控制网络拓扑图,建立了CPG控制模型,通过调节CPG控制参数实现了机器鱼多运动模态的控制与切换。针对鲹科仿生机器鱼的游动方式进行SolidWorks三维建模,在ADAMS中进行运动仿真,并搭建实体样机。实验结果表明,采用基于HOPF的链式耦合中枢模式发生器对舵机的驱动进行控制,机器鱼尾鳍的摆动具有很好的运动柔顺性,易于实现运动模态平滑切换,游动更加灵活。这为机器鱼在海洋执行更复杂任务的研究打下了坚实基础。

基于VP的虚拟实验室原型设计与实现

文章根据虚拟实验室的特点及发展现状,讨论了基于VP的虚拟实验室的基本结构框架,并以电气信息类实验室为例,重点研究了如何建立虚拟元件库、虚拟实验平台。文章的最后给出了一个虚拟实验室基本原型的具体实现。

基于VP与BP神经网络的采煤机摇臂壳体可靠性分析

为了提高采煤机的动态可靠性和工作效率,建立了SL1000型采煤机摇臂的刚柔耦合模型,通过动力学仿真得到了摇臂壳体应力、可靠性信息;基于BP神经网络,预测了其他工况下摇臂壳体的可靠度,分析了其与煤层坚固性系数、牵引速度及滚筒截深的关系,并优化了采煤机的牵引速度;将虚拟样机技术与BP神经网络相结合,为采煤机工作可靠性的预测提供了一种全新的理念和便捷的方法,具有重要的理论意义及较强的工程应用价值。