Motion Simulation Of Mechanism Research Articles

Numerical method for the form finding and force analysis of non-prestressed cable-membrane structures with mechanism displacement

The non-prestressed cable-membrane structures exhibit significant nonlinear characteristics such as mechanism displacement and large deformation under external loads. Analyzing such structural behaviors using traditional finite element analysis methods is challenging due to the singularity of the stiffness matrix and the non-convergence of the iterations. In this study, a numerical method based on the vector form intrinsic finite element (VFIFE) method for form finding and force analysis of non-prestressed cable-membrane structures with mechanism displacement is introduced. First, the basic principle and calculation process for analyzing the deformation and internal force of cable-membrane structures are introduced. Second, the applicability of the present method is demonstrated by four numerical examples, including static analysis of the double parabolic inflated membrane and the hemispherical inflated cable-membrane, mechanism motion simulation of the cloth, and large deformation calculation for the flexible curtain. Finally, a spatial non-prestressed cable-membrane model experiment is performed. The effectiveness of VFIFE method is further validated by comparing the measured displacement and internal force to the numerical results. It is shown that the numerical method proposed in this study can effectively simulate the morphological evolution and internal force distribution for the flexible cable-membrane structures with large mechanism displacement, providing a reference for analyzing such practical engineering problems involving strongly nonlinear characteristics.

A Cable-driven Seat Pedal Mechanism Motion Simulation for Climbing Stair Wheelchair

A seat posture is tilted when the wheelchair robot climbs stairs, in which it is possible for the pedal of wheelchair to collide with the steps. In this paper, a port-based ontology model is described to obtain the outline of the pedal mechanism of wheelchair, and a cable-driven method is adopted to drive the motion of pedal mechanism of wheelchair seat to avoid the collision with the steps. Active posture of the wheelchair is changed to fit the wheelchair robot climbing stair motion on the basis of modeling the pedal mechanism. The simulation results show its validity of the model of the pedal mechanism.

Mechanical Vibration Mechanism Motion Simulation of Ultrasonic Composite Vibration Polishing Equipment

In order to design a kind of mechanical vibration part with stable motion in ultrasonic composite vibration polishing equipment. firstly, the main working principle of ultrasonic composite vibration polishing equipment is briefly introduced. Secondly, the mechanical vibration structure of the design is analyzed theoretically, again, using ADAMS software to simulate the crankshaft connecting rod piston mechanism. When the crankshaft speed is 750r/min, the stroke of the piston is 90mm, which is similar to the theoretical analysis value. Finally, using ANSYS Workbench software to analyze the crankshaft statics. The analysis shows that the design of the mechanical vibration structure is reasonable, which provides a theoretical basis for the study of the mechanical vibration structure of ultrasonic composite vibration polishing equipment.

The Application of Virtual Design on Feeding Device of Precoated Laminating Machine

In the drive of market demand, postpress equipments developing rapidly. Because of environmental protection and energy saving, pre-coating technology has broad application prospects. But in China, the design of the machine are mostly generic and doesnt have a set of perfect design theory. There is no design innovation from the source. Using virtual prototype technology, the structural design of the key components of the pre-coated laminating machine to the paper feed mechanism is improved. Through the three-dimensional modeling, assembly and disassembly, adjustment mechanism simulation, motion simulation of mechanism, the physical, mechanical performance analysis, simulation, prediction, realizes fast implementation and optimization design, improves the processing and assembly technology.

The Geneva Mechanism Motion Simulation and Research to Improve the Design Method

The Geneva mechanism has been widely used in various kinds of machinery. This thesis is about the geneva mechanism of the automatically rotate workbench, using the SolidWorks 3D modeling software to establish a model of the geneva mechanisms parametric design. Afterwards, to motion simulate the geneva mechanism by the Motion, then output the those parameters. In the end, its angular velocity and the angular acceleration, as well as the motion of the interval time will be calculated with the driving plate twirling in a constant speed. The result provides a theoretical foundation for the structural design and the engineering application of the design of this institution. It also present a method for improving the design.

Universal mechanism modeling method in virtual assembly environment

Motion simulation and performance analysis of mechanism are important methods for analyzing assembly quality after finishing assembly simulation in virtual assembly environment. However, most simulation systems have no function of mechanism motion simulation due to the randomicity of mechanism and lack of universal mechanism modeling method. In order to realize the simulation of any mechanism after finishing assembly simulation in a virtual environment, a new universal mechanism modeling method is presented. Two main models are contained in the mechanism model: information model and mathematical model. Firstly, the information model of mechanism is proposed to describe the data structure of mechanism which contains bottom geometry data, information of constraint, link, kinematic pair and physical data. Because the object of mechanism simulation is the assembly, which is assembled during the process of assembly simulation, the information of mechanism can be obtained automatically through mechanism automatic search method. Secondly, mathematical model of mechanism is presented. The mathematical model uses mathematical method to express the mechanism. In order to realize the automatic expression of any random mechanism, basic constraint library is presented, consequently random mechanism can be described based on the basic constraint library. Finally, two examples are introduced to validate the method in the prototype system named VAPP(Virtual Assembly Process Planning). The validation result shows that the mechanism modeling provides a universal modeling method for mechanism motion simulation in virtual assembly environment. This research has important effect on the development both of mechanism motion simulation and virtual assembly.

The Research of Inking Installation Based on Virtual Prototyping Technology

In order to improve the quality of product design, reduce the cost, shorten the development cycle, virtual prototyping technology is used in the process of on the three point support type clutch press mechanism. The design scheme is rapid implemented through establishing three-dimensional modeling, assembly and disassembly, adjustment mechanism simulation, motion simulation of mechanism. So that the physical, mechanical performance of mechanism is analysised, simulated, predicted. Through the virtual operation simulation, early detection of defects in design, to realize optimization design.

Optimization Design and Motion Simulation of Offset Slider-Crank Mechanism

On the basis of optimization-based design goals, design variables, constraints, the Offset slider-crank mechanism mathematical model of optimization is established, its parameters are designed by MATLAB Optimization Toolbox and achieve the best. The closed-loop vector equation of the Offset slider-crank mechanism is established based on the vector method, using MATALB/Simulink for simulation of kinematics to get the slider's motion curve. The method improves the efficiency and quality of design and motion analysis, the result shows that the method is efficient and useful in the design and kinematics analysis of mechanism.

Kinematic Calibration of Parallel Robots for Docking Mechanism Motion Simulation

A new method for calibrating a parallel robot is proposed as part of a project aimed at developing a calibration method for spacecraft docking mechanism motion simulator. To implement this method, a calibration equation is built by generating the constraint conditions of the end-effector's motion in the workspace using a three-dimensional coordinate measuring machine. According to the established calibration equation and the simulation, the geometrical parameters of the parallel robot are identified. The effectiveness of the calibration method with a coordinate measuring machine is verified through random pose test experiment.

Study on Kinematics Simulation of 3-TPT Parallel Machine Tool Based on Pro/E

The machinery composition and working principle of 3-TPT parallel machine tool were analyzed. The three dimensional solid models of components of 3-TPT parallel machine tool were designed by using Pro/E. The virtual assembly and connection of the machine tool were accomplished in the assembly environment of Pro/E. Besides, the three-dimensional motion simulation of mechanism about the machine tool was researched in the mechanism module of Pro/E. The three-dimensional animation achieved by the simulation has the strong sense of reality. The working principle of the parallel machine tool was verified by the simulation. The simulation results show that the machine tool has advantages such as good stationarity, no interference and no singularity.

Kinematics Analysis of Mechanisms Based on Dynamics Multibody Systems in Virtual Assembly Environment

In recent years, in view of the absence of kinematics analysis function of mechanisms in the virtual assembly system, the method of kinematics analysis of mechanisms based on dynamics of multibody systems in virtual assembly environment is presented. A mechanism is considered as a multibody system and the kinematics equations are established based on Descartes coordinate system. All the kinematics parameters, just like position, speed and acceleration, can be obtained through solving the kinematics equations. In addition, the realization method of mechanism motion simulation in virtual assembly system is also proposed which contains the hiberarchy, data structure, module classes and simulation process of the system. The method is implemented and validated based on the prototype system VAPP(Virtual Assembly Process Planning).