Dynamic Characteristics Optimization Research Articles

Modal Analysis of Electronic Power Steering Based on Finite Element Method

With the application of the software Pro / Engineer, the 3-D model of automobile Electric Power steering system is built. The pre-processing and post-processing of the model are carried in I-DEAS software, while PERMAS solver is used to calculate. The structure design and dynamic characteristic optimization of the model are researched, and on the basis of natural frequencies analysis, several design improvement schemes are brought forward. The optimum scheme is generated through comparison.

Vibration Isolation Failure Analysis and Dynamic Characteristic Optimization of NVD Mecha Based on ALGOR

The purpose of this paper is to improve the NVD optical disk driver performance in combined sound system. Based on the optical valley of China-Wuhan R&D (research and development) red HD-NVD mecha system application, structural dynamic characteristics of the optical disk driver main parts and vibration isolation system can be analyzed by the multi-physical analysis software, ALGOR. Obtain the various modal parameters of vibration isolation system provides a solution of the unstable problem of the optical disk driver working performance which due to the low frequency vibration audio system. It is theoretically showed that the secondary vibration isolation system is feasible and laid the foundation for the optimization design of vibration isolation system.

Dynamic Characteristics Analysis and Optimization for Hydraulic System of a Self-Propelled Steel Bridge Based on AMESim

Based on AMESim，a method of dynamic characteristics analysis and optimization for hydraulic system of a self-propelled steel bridge (SPSB) is presented. The approach of this work includes steps of (1) modeling the hydraulic system by defining components and their parameters according to working conditions; (2) evaluating control modes of the system, testing performance of components and analyzing main factors causing load-impacted and movement-unsynchronized of cylinders in the system by repeated changing and running of the model; and (3) improving the system. The results of this research show that sudden change of piston-rod movement and fluid pressure in hydraulic cylinders could lead to larger load-impacted of the system, and fluid pressure loss and load change of hydraulic cylinders would greatly effect on stability and synchronization of the system; but accumulators installed in the circuits can effectively decrease load impact and enhance movement steady of cylinders, and proportional valves used to control the circuits can obviously improve synchronization performance of cylinders.

Study on Dynamic Response Optimization and Experimentof the Double Crank Ring-Plate-Type Pin-Cycloidalgear Planetary Drive

The nonlinear analytical modal of the double cranck ring-plate-type pin-cycloid planetary drive system with Multi-DOF was established. Furthermore, the influence of various parameters and clearance changing with time on dynamic response of the system was studied. The vibration mode, vibration modal and resonance frequency on various boundary conditions have been analysed, and a series of pertinent vibration and noise tests have been done. In the meantime, the machine structure and shape of main parts of the new prototype were improved to reduce vibration and noise，the dynamic characteristic optimization of the whole system was obtained. According to the results of theoretical and dynamic test analysis, the main influence factors have been found out. The theory of optimization design and method of the dynamic-response analysis of the double cranck ring-plate-type pin-cycloid planetary drive have been set up. And on the basis, the optimization design of the structure, parameters and toothpfile have been fulfilled. The theoretical basis has been provided in the design of new prototype.

The Application Research of Virtual Prototyping Technology in the Design of Oil Field Pumping Units

Regulating diameter-variable moment pumping unit as the research object. which been analysed by virtual prototyping technology, by this way, the application ways and realization means of virtual prototyping technology is explored in this field.The virtual prototyping technology is introduced into the dynamic characteristics analysis and optimization for pumping units, and the 3D CAD software, multibody system dynamics analysis software and finite element analysis software were combined. The digital physical prototype for pumping units is established by UG software; ADAMS was Used to establish the function virtual prototype and virtual test system, to develop the test analysis and optimize its structure parameters according to the movement requirements for pumping units; The finite element analysis of the pumping unit parts is processed in the ANSYS environment, and structural design is optimized in accordance with the stress distribution characteristics of pumping components. In this paper, CAD and CAE technology are used with close combination, the pumping units dynamics analysis and simulation is developed from the systemic perspective. The research has the characteristics of high precision analysis, wide range of applications and good practical value.

Air-bearing position optimization based on dynamic characteristics of ultra-precision linear stages

Air-bearings are installed between the stator and the mover of ultra-precision linear stages to suppress vibration and mechanical contact. Spring-damping elements are used to emulate the complex interaction of the finite element model (FEM) developed in this paper and the system dynamic behaviors are analyzed. Through the experimental modal test, the validity and reliability of the model are proven. However, the dynamic characteristics including mode frequency, mode shape, and response amplitude are obviously changed with the position of air-bearings. The combined optimization method is used to optimize the air-bearings position. The best and worst positions are obtained using the dynamic characteristic analysis. The method can be generalized to the connection position of different components in manufacture elements and to implement the system dynamic characteristics optimization when the connection position can be changed.