A method based on mechanical kinetics, Virtual Prototype technology and Finite Element Method (FEM) is proposed, aiming at the dynamic balance of planar linkage with elastic deformation. The method applies to the situation that the elastic deformation of the components can’t be neglected. Translate the key components to flexible bodies by FEM; Build the rigid-flexible multi-body dynamics model by dynamic analysis software, and synthetically optimize the dynamic balance of the model by using the comprehensive indicator which includes input torque, shaking force and moment as the objective function; Finally, according to the parameter result of the previous optimization, the component’s geometrical shape was designed in three-dimensional modeling software. Taking a kind of crank-slide mechanism as an example, it uses this method to optimize a crank-slide mechanism’s dynamic balance and to make the objective function value declined by about 9.2%. The mechanism’s vibration characteristic is improved, so the method is proved to be practical and effective.
Thermal design and thermal analysis of control cabinet for pattern sewing machine was researched to make components’ temperature meets the requirement. Basic flow sheet of research process was introduced. Then, preliminary thermal design and thermal analysis was performed, and the computed result indicated that temperature of some components was out of limit. Next, by optimizing the location of fan and components in cabinet, the temperature of servo driver 1 to 3 dropped 11.1 oC, 10.8 oC and 11.3 oC respectively. The data shows that cabinet’s heat dissipation is improved, and the thermal design of the cabinet is reasonable. Finally, Thermal test of the prototype was performed, which proves the thermal design is effective, and the numerical simulation result is correct.
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