Applied Mechanics and Materials Vol. 740

Abstract: For simplifying the cockamamie measurement process, in this paper, special equipment for measuring non-cylinder pinhole of piston is designed and implemented. First of all, the measuring principle, the hardware structure and the software system are illustrated. In addition, the measurement error is analyzed in detail. Finally, it is proved that the precision of the instrument is as high as that of the foreign advanced instrument.

Abstract: This Paper analyzes the principle of high-speed spindle electromagnetic dynamic balancing device and designs a device driver. The device is a dynamic balancing system for high-speed spindle which guarantees the machine running normally and gives significantly improved part surface quality. According to the equilibrator and clutch working sequence the driver activating the balancing device was designed based on AT89C51 and PMM8713 to control the electromagnetic dynamic balancing device in real time.

Abstract: An optimal design method for the qusai-static folding and deployment of opposite tape-spring flexure (OTSF) hinges is presented based on the response surface method. The full factorial method is employed to design of experiments, and the qusai-static folding and deployment nonlinear analysis is obtained by ABAQUS/Explicit slover. The surrogate models of the OTSF flexure hinge are derived by the response surface method. Considering lightweight and high stability, the peak moment of quasi-static folding and deployment, and maximum Mises stress in complete folding configuration as well as mass are set as the objectives to get the optimal performances. The modified NSGA-II is used to seek for an optimal design. The relative errors of the objectives between the optimal design and the FE analysis results are less than 3.5%.

Abstract: In this paper, Solid works software and finite element analysis software ANSYS workbench combined for ZY10000/26/55 type two columns shield large mining height hydraulic support top beam finite element modeling, through the mathematical model analysis to determine the mechanical load, and then using ANSYS software to analyze the stress and displacement law by three conditions: both ends of the beam in concentrated load, unilateral loads and torsional loads. In this way, we know the stress and displacement of hydraulic support beam after the distribution of load, for stress concentration, which make rationalization proposals on large mining height hydraulic support design, we recommend reinforcing ribs, increasing cover thickness or using higher strength material (Q460) and providing a reference in other measures to improve the strength and stiffness of the hydraulic support top beam.

Abstract: Steering axle and steering knuckle arm often appear craze problem within its service life. In this paper, the structure of a car steering knuckle was investigated using finite element program at uneven road surface conditions, emergency braking condition and sideslip conditions under the condition of full load. The results show that the joint shaft neck and adjacent shoulder of steering knuckle are the easiest to be damaged. At the same time, the steering knuckle meets the strength requirement under various conditions. Secondly, use the theory of fatigue to analysis and consider parts material fatigue properties, mean stress and other factors. Steering knuckle fatigue simulations use the ANSYS software to estimate the fatigue life. Under the condition of loop 900000 times, there was no damage in steering knuckle. According to the analysis results, reduce stress concentration and the surface roughness for steering knuckle improvement measures are proposed

Abstract: Aiming at the problem of intense vibration of the long pipeline delivering coal slime in the power plant, the finite element model of pipeline is established and modal analysis is carried out by ANSYS. The natural frequency and vibration characteristics of axial vibration are obtained. The vibration characteristics are studied and different pipe segments that produce bigger vibration very easily in operation are determined. Theoretical guidance about pipeline vibration under the external load for further analysis is provided.

Abstract: The nonlinear FEM analysis is performed to the problem of large strain nonlinear application for flexible mattress. The element with cloth type option is used to establish the FEM model for the analysis of flexible mattress. The simulation can produce correct profile of deformation, accurate distribution of stress and strain, meanwhile taking account of geometric nonlinear from large strain. The results of the paper are compared with those from the theory and in-situ test. Some valuable conclusions are made from the results analysis.

Abstract: In order to improve the process precision of the machine tool, further development of SVMR was achieved by QT Creator. Support vector machine was applied to the ARM11 development board, SVMR model was online trained and real-time predicted the values of machine tool thermal error. Compared with the widely used BP neural network, this method has the characteristics of high compensation precision and strong generalization ability. Experiment research has proved that the stronger effectiveness and higher accuracy using this method.

Abstract: With the development of production and technology, the devices of oil refining, chemical, fertilizer and others are progressing to the direction of high parameters (high pressure, high temperature). Pressure vessels must be open, which will made the stress concentration problems more serious, and traditional design methods derived from empirically formula fails to meet the actual demand. In this paper, a theoretical result is calculated with a simplified model of the opening holes in cylindrical shell, verified by a group of solutions got by the ANSYS simulation. And it turns out that the result is rather satisfactory.

Abstract: The electric valve, cutting off or connecting pipeline of nuclear equipment, is an essential component of nuclear facilities for safe operation. The structure of self-developed enclosed nuclear electric valve is introduced in the paper firstly, and dynamics analysis of steam fluid in valve is carried out to tackle typical problems including leakage in the rapid open-close process of valve for high-temperature and high-pressure steam fluid. It can be determined that dynamic characteristic of steam fluid will directly affect force suffered by valve in the rapid open-close process, greatly influencing movement and ultimate position accuracy of valve gate.