Advanced Materials Research Vols. 694-697

Abstract: Centric slider-crank mechanism forms the main mechanism of slider-crank type cluster well pumping unit(SCTCWPU). The friction and wear is the core problem of (SCTCWPU). The pressure of the slide upon the rail is one of the major factors of the friction and wear between the roller and rail.This paper presents the static analysis and optimization of the structure of the slide. In addition,a comparative analysis of the two types of the slide’s structure is made on the basis of actual working conditions.

Abstract: In this paper, we investigate the Poincar ́e bifurcation of the non-Hamiltonian quadratic integrable system with one center and one unbounded homoclinic loop formed by cubics. It is proved that the cyclicity of the period annulus under quadratic perturbations is equal to two.

Abstract: Based on an existing in-line six cylinders engine, this paper built a model of in-line five cylinders engine, and analyzed this engine’s balance property in theory. In order to improve the balance of this in-line five cylinders engine, a kind of double-shaft balance system was used, and it turned out to be effective by simulating with multi-body dynamic software-AVL Excite.

Abstract: This article has established the machine shop truck with the engine shafting torsional vibration model, analyzed the engine rotation inertia and the torsional rigidity, established the engine crank torsional vibration equation, analyzed the machine shop truck to have the torsional vibration reason with the engine, proposed the engine torsional vibration reduced the method, has certain reference value to the engine design and the use.

Abstract: Computational fluid dynamics (CFD) software was used to simulate the internal flow field of an example muffler, and compared the results with the experimental data, verifying the reliability of the simulation algorithm. On this basis, changed the example muffler structure, researched the pressure loss of muffler which was influenced by the insert duct, the position of the baffle and the inlet air velocity. The corresponding regularities have been obtained with the results of computations, which provide a basis for the design of the muffler.

Abstract: In this paper, the damping force loci of a twin tube shock absorber were estimated by using the empirical data. The variation of the damping force was investigated for movements of piston such as the expansion. The relationship between the piston velocity and the damping force were estimated by using the empirical data of four different conditions of coil spring turns. Also the relationship between the coil spring turns and the damping force were estimated by using the empirical data of four different piston velocities. Based on the experiment results, the estimated damping force variation functions provide the physical information of the components of the main piston valve system to save the manufacturing time and cost for the shock absorber

Abstract: Isolation system of the heat water pumps can be simplified as a double sources exciting and double output double-deck vibration isolation system model, expressions of transmitted power flow and vibration speed to the basement are deduced based on the double sources exciting and double output double-deck vibration isolation system electric-force(E-F) analog picture, the curves of power flow and vibration speed transmitted to basement how the upper deck vibration isolation and intermediate mass effect are drawn by using mat lab program. The results show that the adjusting the upper deck vibration isolation stiffness parameters has little effect on the amplitude of vibration power flow, increasing intermediate mass can move first peak to the low frequency, increasing intermediate mass can obviously reduce t transmitted power flow and transmitted vibration speed amplitude to the basement.

Abstract: In this paper, a three-dimensional shaking table test of three three-span subway station model is done. Three test seismic waves were selected in this experiment, which were applied to the model. Modal analysis of the structure was done, and the determination of the acceleration of the model structure was obtained. And the law of underground structures under earthquake damage was analysis. Soil surface acceleration process and its response spectrum and strain are obtained in the different amplitudes of ground motion input case. From experiment cracks in the emergence and development of the situation were observed, and which gives recommendations for the seismic design of underground structures.

Abstract: Rational and efficient use of the sucker rod vibration energy is one of the effective ways of pumping unit energy saving. The vibration mechanics as the basis for establishing three-dimensional coupled vibration mathematical model of sucker rod-tubing-liquid column, and using difference solution to reproduce vibration process within one stroke of the sucker rod string, on this basis, analyzing the variable stiffness sucker rod string to the impact of the polished rod load and the pump stroke, and gaining reasonable parameters of the sucker rod string vibration energy, and combining with the working conditions of the sucker rod string to establish the match conditions of the sucker rod string liquid column incentive and polished rod incentive, and proposing the condition of pump to generate over-stroke to provide the theoretical basis for rational use of the sucker rod string vibration energy.

Abstract: The LQR algorithm has been widely used in the hybrid vibration isolation system. However, it cannot make the hybrid vibration isolation system global optimal with the coupling of structure and controller. Hence, the multi-object optimal design of the double-layer hybrid vibration isolation system based on the LQR algorithm was made by the NCGA method. The results showed that the vibration of the mechanical equipment did not get worse with the reduction of the force transmission ratio, and it made an approach to the optimal design of the hybrid vibration isolation system.