Advanced Materials Research Vols. 308-310

Abstract: This study investigated the solution of the rigidity and structural vibration for system of linear guideway type based on ANSYS workbench. By comparing the results derived from the simulation of the model and the corresponding theoretical results, the validity of the theoretical solution can be verified. The analysis includes the system rigidity and the natural vibration frequency in the direction of vertical slider (Vertical), rolling (Rolling) and swing (Pitching), the structural vibration frequency for system of linear guideway type is carried out, the model is built according the true dimensions, what is more, the rollers are not necessary replaced by springs, because there is not so much difficulties by using ANSYS workbench and more accurate results can be obtained in this way. Two different types of simulation are carried out, and the simulation results show that different geometric sizes of slider, which mean different numbers of rollers, will change the resonance frequencies and mode shapes, and more rollers can enhance the stiffness of the LGT model, then reduce the possibility of resonance happening.

Abstract: According to derive the efficiency formula of 2K-H differential gear train, the direction of meshing power has been determined. The test bench of fear train combination and structure analysis has been used to experimentation. The test results of various rotational speeds and torques have been collected by the dynamic load simulation loading. Through analyzing the test data, the efficiency formula of differential gear and its relationship with the dynamic load have been demonstrated. The results of experiment have been provided to experimental identification for the theories research

Abstract: With the belt driving device which is affected by bi-directional alternating load taken as research object and with the elastic slide between belt and pulley which is caused by elastic deformation of the belt considered, the calculating model of belt instantaneous sliding friction is established. The belt is simplified to elastic body of longitudinal vibration, the mechanical model of the belt longitudinal vibration which is excited by alternating friction is established, and the mathematical model of the wave equation form is established. The numerical simulation model of wave equation is carried out on using the superposition method of mode of vibration. The simulation models of the belt instantaneous sliding velocity and the belt instantaneous sliding efficiency are presented. The factors affecting sliding efficiency are pointed out, such as oscillation amplitude of alternating torque and initial tension of belt. The following conclusions are obtained by the simulating results: (1) load torque fluctuations will lead to lower sliding efficiency; (2) specifically, the sliding efficiency will decrease obviously in the area where the direction of load torque is occurring; (3) on condition that the belt doesn’t skid, the sliding efficiency of the belt reduces with the increase of initial tension, and the sliding efficiency will increase through optimizing the initial tension of belt.

Abstract: A commercial transmission provided by enterprise is analyzed in this paper. Its 3D model is established in UG software, its dynamic force and corresponding frequency diagram of constant mesh gear pair is analyzed in coupling mechanical system simulation(ADAMS). According to the result of analysis, the conclusion can provide basis for fatigue property, strength checking, structure optimization of gears and shafts, and noise abatement of global transmission. This method is an additional project for the stability, security of transmission products.

Abstract: The vibrating roller crusher convert relative vibration generated by two rigid bodies to bring high-frequency impulse on grain layer (or granular) in chamber, which makes grain crush to particle. Based on the science of vibration, dynamics model in vibration-impact crushing system of a bilateral single-mass and vibration differential equations are established. By dynamic analysis, amplitude frequency curve, hysteresis impact curve and energy absorption curve are all founded. The curves on dynamic response are discussed. Under the consideration of their results, displacement, velocity and acceleration with the time history are induced. Impact on the left and right sides are unsymmetrical. Influence laws on amplitude frequency, impact, energy absorption from clearance and vibration frequency is also established.

Abstract: In the practice of mechanical systems, all kinds of motion pair have the clearance exercise. With high-speed, precision machinery and instruments are proposed higher and higher demands for precision , The nonlinear effect of mechanism clearance can not be neglected. As the mechanism with clearance is a strong non-linear systems, System modeling is very complicated, it is difficult to establish a more accurate model , using Linkage mechanism with clearance example to set up a mathematical model, proposed a new method of establishing such models, and construct an inverse model for the Linkage mechanism, and Open-loop with inverse model feed-forward compensator control was firstly performed to compensate Linkage. The results of test show that：This new modeling method greatly reduced the difficulty of solving problems and has higher precision; this inverse model feed-forward compensator has effectively reduced the non-linear error of the system and has improved the control precision of Linkage mechanism.

Abstract: Step-type compound planetary gear sets are widely applied in vehicle systems. Comprehensive dynamic model of step-type compound planetary gear sets, which includes translational, rotational vibrations and static transmission errors, was established. Natural vibration characteristics of the system, such as natural frequencies and vibration modes, were analyzed. Belt shape distribution characteristics of its natural frequencies was researched. According to vibration characteristics of both central components and planets, natural vibration modes of the system are classified into three types: central components translational vibration and planets random vibration, central components rotational vibration and planets identical vibration, central components static and adjacent planets reverse vibration mode.

Abstract: A novel configuration of CVT that contains two cones located in the same shaft face to face is researched about the traction performance under high speed based on the theory of elastohydrodynamic lubrication(EHL). The effects of load, radii of curvature and slip-roll ratio on the traction characteristics and power transmission are analyzed. The results show that with increasing load the traction coefficient enhances close to linearly where the load is not heavy and the minimum film thickness decreases linearly when the inner wheel radii of curvature less than 0.085m. The leftmost position could transmit higher power. The power transmitted improves slightly as slip-roll ratio enhances in an appropriate range.

Abstract: In order to ensure the truth and feasibility of constraints during the optimization of suspension parameters, a method, combining gradient optimization with ADAMS, is put forward to optimize the suspension parameters of the truck, which can improve its running comfort and friendliness. Based on the evaluating indicators of ride comfort and road-friendliness, the impacts of suspension parameters on ride comfort and vehicle damage on the road were researched. According to multi-body dynamics theory, a virtual prototype model of the truck is built by ADAMS. The effect of traveling speed, suspension spring stiffness and shock absorber damping on vehicle ride comfort and road friendliness was analyzed. Then the suspension parameters, in favor of ride comfort and road friendliness, were obtained. It is helpful to design the suspension of truck.

Abstract: With regard to the problem of abnormal vibration for power assembly of diesel engine of the Sport Utility Vehicle in working rotation speed conditions, the method of test mode combined finite element simulation analysis was adopted, the dynamic characteristics of the power assembly were studied in all conditions. First vibration modal testing of the power assembly was carried out in whole vehicle condition and in test bed, the cause of abnormal vibration of the power assembly was found out, the bending stiffness was low, then a kind of actual finite element simulation model of the power assembly was set up, the constraint mode was calculated. The rationality of finite element simulation model of the power assembly was validated. Integrated modal testing and simulation analysis showed that the low stiffness of flywheel shell led to the low first modal frequency of power assembly which was easily in the excitation frequency range of diesel engine working rotational speed, and resulted in system resonance of the power assembly