Advanced Materials Research Vols. 694-697

Abstract: Planetary gear sets have advantages of little noise, high transmission ratio, compact arrangement, so it has been widely applied in automobile and aerospace applications over the years. Using Lagrange equation, a free vibration theoretical model of a single planetary gear set was built, which was solved with modal superposition method. Combined with theoretical results, two types of modeling methods of planetary gear structures with the simulation platform SimulationX were studied. The simulation model suitable for analyzing vibration characteristic of planetary gear sets and inherent vibration characteristic in different situation were studied with the optimal modeling method. Important influencing factors of planetary gear sets vibration characteristic were studied and reference for dynamic best designing planetary gear transmission sets were provided.

Abstract: Using PROE software build the model of gearcase, and guide into ansys software for modal analysis in free state. It can get inherent frequency, here only take the ten order frequency, then calculate the pressure that lid applied, add to the role of theshell surface, using ansys for modal analysis to calculate the inherent frequency. When gearcase in the working, bearing and frame will constrain it. Considering this, on this condition, continue analyse the inherent frequency of gearcase, work out the results. Finally, compare these and analyse results, we can know that external conditions have a great influence on gearcase’s inherent frequency

Abstract: Considering nonlinear characteristics of springiness and damping element, the quarter-car suspension nonlinear dynamic model is established with ADAMS. The simulation model of suspension established, and the simulation curve of nonlinear suspension is gotten by using the numerical simulation methods. The target parameters of the piecewise linear three stage control mode of the shock absorber are studied under the different random road excitation, it would provide the theoretical basic for the nonlinear damping matching of the vehicle suspension system.

Abstract: In this paper, we studiedthe stage machinery noise in theatre by simulation and measurement. Theconclusion proposed in this paper shows that the region closed to proscenium ismore representative when evaluating or measuring stage machinery noise.Therefore, during the measurement of stage mechanical noise, it is better tochoose the first row of stalls as the representative area than only the middle seatwhich is specified in recent standards and specifications.

Abstract: This paper provides a illustration of the micro vibration measurement as well as the major vibration source of precision equipment. According to propagation and attenuation law of vibration in the soil, this paper gives some methods of control vibration which used in practical projects. And it inntroduces the anti-micro vibration measures in the design of precision equipment.

Abstract: Based on vibration problems of a six roller cold rolling mill, hydraulic-machinery coupling vibration system dynamic model of the 2180mm 4-stand tandem cold rolling mills was built integrated the software of MATLAB and ADAMS and simulated. The simulation result was consistent with that of the field test data revealed by rolling mill vibration. Through the comparison of the vertical systems motion displacement, velocity, acceleration under the different work condition, coupling vibration causes and evolution mechanism was analyzed, that had practical value to further control mill motor behavior.

Abstract: The material selection optimization for vibration reduction design is studied present article. By introducing the stacking sequence hypothesis of metal material, taking into account the power flow level difference and vibration level difference parameter, the mechanical parameters of the material and plies number are defined as design variables, and the mathematical model of structural dynamic optimization based on material selection optimization approach is established. Finally, a naval hybrid steel-composite mounting structure for example, by introducing genetic algorithm, the optimization problems is solved. The numerical results show that the optimization method is effective and feasible.

Abstract: The cranes simplified as the cantilever beam system. The bending vibration differential equations were built using Hamilton principle.According to discrete differential equations by the finite difference method, the modes of vibration and the natural frequencies can be obtained. Application of discrete time and MATLAB vibration toolbox, the displacement curve and phase on the crane arm can be gotten. And the effect of amplitude angles and lifting loads on the arm vibration had been discussed.The work of the vibration on the crane arm has an universal meaning in the cantilever beams.

Abstract: On the basis of the Mechanics and Kinematics analysis of built-in chatter suppression boring bar, the research analyzes the motional stability of built-in chatter suppression boring bar, and uses SIMS vibration absorbers for chatter suppression theory to design the characteristic parameters of vibration absorber; then with MATLAB optimized to get structural material parameters of vibration absorber; finally conduct harmonic response analysis to built two-dimensional model of built-in chatter suppression boring bar by ANSYS, compare and optimize the results to guide the development of built-in chatter suppression boring bar.

Abstract: Atract: Taking the underground powerhouse in a large pumping station as an example, to establish the geometric model of the underground powerhouse structure, and finite element division, analysis of the natural vibration characteristics of the structure, using the method of harmonic response analysis, calculation and analysis to the vibration response of the structure under different conditions. Provide a theoretical basis for the safety evaluation of building structure.