Papers by Keyword: Harmonic Response

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Authors: Wei Meng Ma, Jian Jun Wang
Abstract: An industrial turbo engine is modeled and meshed in ANSYS using solid elements. A rotordynamic analysis of the selected parts of the turbo engine is performed. For the unbalance response prediction, a novel method for modeling unbalance in 3D solid rotor model is presented and validated using a simple rotor model. In order to reduce the model order degree, transfer functions of the casing and bearings are generated and incorporated into the rotor-bearing system to account for the influence of elastic support stiffness on the rotor system. Modal and unbalance response analysis is performed on the 3D solid finite element rotor-bearing model using the unbalance modeling method presented in this paper. The results obtained from modal and unbalance analysis are compared and discussed.
Authors: Ao Xiang Liu, Jun Wang, Jun Xian Kang, Qiang Zhang, Jun Sun, Qi Lin Shu
Abstract: TX1600 boring and milling machining center milling part was studied. The Three-dimensional solid model was established based on Solidworks. Simultaneously, modal analysis was carried out by ANSYS Workbench software, the first six natural frequencies and corresponding modes were acquired. Based on the modal analysis, the harmonic response analysis of milling part was conducted,and the response curves of the three main motion orientation were obtained respectively, the vibration performance of milling part under forces was further explored,and the finite element model was validated. The feasibility of the model to simplify the program was verified by modal and harmonic response analysis. The study provides a good basis in terms of selecting a specific material. The structures and material are optimized. Ultimately, a lot of energy is saved.
Authors: C. Xu, Z.J. Wu, J.F. Zhang, P.F. Feng, D.W. Yu
Abstract: This paper provides the methodology on analyzing the dynamic characteristic of machine tool in consideration of joint parameters. To ensure the dynamic model is available for further study, modal experiment for vertical machining center is involved. The machine tool is divided into several parts and connected with spring and damping for substructure modeling. Particularly, the bolt-fixed joint is an example for the joints modeling. Based on the dynamic model, simulation of modal analysis and harmonic response are carried out. Besides, method of optimization design of column and milling box is given to improve the performance, which is proved to be feasible in harmonic response.
Authors: Ji Yu, Qiang Wu, Su Yang Ma, Chen Quan Zhou, Dan Shen, Ping Liao
Abstract: The principle of the magnetic levitation cylindrical linear motion guide and the theory of vibration analysis were introduced. By finite element analysis software ANSYS, modal analysis for guide was made to get the natural frequencies and vibration modes, the harmonic response analysis was also made to get the displacement response by the cutting force on the basis of modal analysis, and the influence of displacement on electromagnetic force was analysised.
Authors: Guang Yao Zhao, Peng Fu, Shu Wen Zhou, Shan Ge Tong
Abstract: After the three-dimensional solid modeling of the SG135 automobile gearbox, finite element analysis models of static, transient and harmonic response load are built based on correlation theory. On the basis of ADAMS dynamic simulation of different gearbox gears, transient load of the gearbox casing at different working gears is found out. With frequency response characteristic of gearbox casing analyzed at typical working conditions of first gear and reverse gear, the evaluation of some factors such as strength and stiffness are given out, which provides theory basis for further improvement of gearbox casing structure and strengthening weak links. Based on harmonic response analysis, the impact on gearbox casing structural vibration by harmonic excitation of the engine is imitated, and the match relation of frequency response between the gearbox and the engine is analyzed. Improvements about engine operational limits matching and gearbox structural design are proposed.
Authors: Hai Fei Qiu, Song Lin Wu
Abstract: Finite element model of NC machine tools bed was set up in ANSYS, natural frequencies and modal shapes in low order were calculated by modal analysis of the bed. Then displacement-frequency curve and stress-frequency curve between 300 Hz and 700 Hz were acquired based on harmonic response analysis of the bed, and dynamic response of the bed which affected by harmonic load was clear; Transient dynamic analysis of the bed was finished by Full method, then displacement curve and acceleration curve about time domain were acquired, and influence of impact load during the process of starting NC machine tool which affect on the bed was understand, in results, some important references and basis were offered to optimal design of the beds dynamics.
Authors: Jie Yin, Jun He, Su Ping Zhou, Wei Huang
Abstract: Transmission shaft is an important component of automotive transmission, parts of which are facing the problem of fatigue failure. This paper mainly analyzed the performance of the transmission shaft based on finite element method. Firstly, stress contour is obtained of the shaft. secondly, get the fatigue performance according to material S-N curve. Finally, The dynamic characteristics including vibration modal and frequency response are analyzed. The results can provide reference for dynamic design of transmission shaft , as well as the structure optimization design of the transmission shaft .
Authors: Y.C. Jiang, Xian Li Liu, Rong Yi Li, P.F. Pang, J. Xu
Abstract: High speed cutting technology has become one of the most important technology in manufacturing of automobile panel dies. The range of each motion axis of numerical control equipment is large and the entire process system exist certain differences of the dynamic characteristic cause of the large type surface size of automobile panel dies. And affect the stability of the processing conditions directly. In this paper, different locations dynamics of large CNC machining equipment was analysed, then getting the influence of processing on the dynamics of the processing position. Simulation results show the machine dynamic characteristic mainly affected by the working position of the spindle box, and the location of the workbench has smaller impact. In the low speed mode, the stiffness characteristics of the spindle box in the operating position on both sides is better and in the high-speed mode the stiffness characteristics is better in the right side of the spindle box. When the table near the right end position in X, Y have weak stiffness near 90Hz.It has weak stiffness in the left side of table near 80Hz and in middle position it has weak stiffness near 80Hz or 140Hz . In the cutting process to provide guidance for the selection of appropriate processing location and process parameters.
Authors: Bin Li, Jin Cai, Xiang Wei Kong, Zhao Feng Song
Abstract: The sieve box is the major working part in fluidized bed, which bears the repeating dynamic loading. It generally works in severe condition, and the strength is a problem. In this paper, the vibration of the sieve box was analyzed with finite elemental method. Firstly, a 3D model of the box was constructed by PRO/E. Then the modal analysis and harmonic response of the model were investigated using ANSYS WORKBENCH. Based on the modal analysis theory,some parts of the sieve box were structurally optimized to avoid resonance. The simulation procedure adopted in the study and the achieved results could definitely facility the fluidized bed design and improve the design efficiency.
Authors: Jin Hua Li, Yong Xian Liu, Yang Yu, Jia Liang Han
Abstract: The designed spindle of turning center is researched. There are two groups of the spring-damper elements to simulate the bearings. The spindle is modeled to be 3D FEM parametric model, and the static analysis, model analysis and harmonic analysis are finished in ANSYS. Static stiffness, natural frequency and dynamic stiffness are calculated, the danger points are checked according to the resonance modes, and the performance of the spindle is verified to be reliable.
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