Papers by Keyword: Vibration Model

Abstract: Starting from the fact of backlash and gear transmission error, it is established vibration model of spiral bevel gear lapping system with two degrees of freedom. Through normalized calculate, it is obtained dynamic response of lapping vibration model under different braking torque. According to the time course and the phase diagram, during the process that brake torque switch from small to big, teeth meshing, collision and disengaged alternately goes on, and with the braking torque increases to a certain value, the teeth collision disappear and then back into the complete meshing state.

Abstract: The most widely used pavement roughness index is the international roughness index (IRI), but it is a poor predictor of ride comfort. In addition, the rider has not yet been included in the vehicle model used to evaluate pavement roughness. In this paper, in order to evaluate the comfort of the rider directly and consider the effects on ride comfort of pitch movement, a five-degree-freedom vibration model was built when a rider was added to a pitch-plane vehicle model. The vertical weighted root-mean-square (RMS) acceleration of the rider was suggested to be pavement roughness indices, which were related to ride comfort, respectively. The new roughness indices were calculated and a new pavement roughness evaluation method was developed.

Abstract: Taking a special vehicle vibration system as the research object, according to the actual structure of the chassis, the spring damping and stiffness of the nonlinear characteristics and the tire vertical elastic accounted, a nonlinear vibration model of special vehicle based on dual-mass-system is set up. The tire radial stiffness value is analyzed in Ansys, a simulation is performed by leading the mathematical model of suspension system into Adams, a characteristic curve of stiffness and damping of suspension system is obtained.

Abstract: This paper analyzes the object vane motor and composite solar energy environmentally friendly cars , focusing on its air motor drive way , abstracted into five degrees of freedom vibration model vehicle , mathematical modeling , its stability and reliability analysis of research , and to optimize its speed and acceleration , and proved its stability and reliability of data through a lot of practice .

Abstract: The ball screw is a main driving component in the CNC machine tools. The ball screw’s structural performances and working conditions will have an important impact on the machining accuracy of CNC machine tools. However, the previous research method can not suffice the precise results’ requirements. So it is very necessary to do an in-depth analysis of the ball screw, which use dynamic research and be combined with the FEA software ANSYS. This article uses the above methods to do the modal analysis, and then gets the intrinsic frequency and the vibration model. It will make an important significance for guiding the practice.

Abstract: The magnitude of transformer vibration is influenced by that of voltage and current, which might lead to the wrong results in detecting the fault of core and winding by vibration analysis method. Based on the generation machnism of vibration signal, a transformer tank model was presented in this paper. It concerned about the relationship between the vibration (core vibration and winding vibration) and the operating parameter (voltage and current). The experiments were conducted in lab under different voltage and current, and then the vibration model was set up. Furthermore, this vibration model was also used to detect the simulated turn-to-turn short-circuit fault on windings. By comparing the vibration magnitude calculated by the model with the measured one, the defect condition of transformer was confirmed, which verifies that the vibration model presented in paper is effective.

Abstract: Based on the real working conditions of the carriage hoists, the Finite Element Method (FEM) software is used to make static and dynamic analysis for the key component and then to optimize its components according to the analysis results to achieve some goals, e.g., simplified structure, weight reduction, costs reduction, etc.. The process provides useful references for the design of carriage hoists.

Abstract: This paper proposed a method to analyses and obtain the vibration identities of DTG(Dynamically Tuned Gyroscope) within the vibration-overloading environment based on ANSYS11.0. Finite element model of DTG was constructed by ANSYS11.0. The Natural Frequencies and vibration modals of DTG in the cases of both being stationary and rotating were studied respectively through the method of modal analysis. The influence of each-rank vibration model of DTG on its output was investigated. The result of this paper provides a stable basis for improving the design of DTG and enhancing the functions of it.

Abstract: Vibration model can reflect conductors nonlinear vibration under wind excitation .The paper improves and expounds the detailed derivation process based on the previous studies, and studies the movement type of conductors. Comparing with the vertical displacement change of conductors in different conditions to prove that the model derived is reasonable. The paper analyses conductors nonlinear vibration in the case of external condition change to study the movement change of conductors. Lyapunov stability theory and Routh-Hurwitz criterion are used to obtain critical wind velocity of conductors, namely the conditions for conductor galloping. The results shows model derived can reflect conductors nonlinear vibration under wind excitation.

Abstract: It applies flight dynamics and vibration principle to create vibration model of aircraft landing gear considering aircraft tire damping, and get the equation of analytical solution based on the impact on airfield pavement roughness. It studies the relationship between dynamic load coefficient and time and speed and roughness. For a special aircraft, it gives the allowable level for pavement roughness based on the influence of pavement and passengers comfort.