Shi Guoxin, Wu Bo, Ding Yufeng (School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan 430070, China) 1 Introduction The reducer is a widely used and typical mechanical device. The design of the reducer has always been one of the classic items in mechanical design. The most difficult component in the reducer is the gear shaft of the reducer. The gear shaft is a key component for supporting the parts on the shaft, transmitting motion and power. Although its 3 degree has a great influence on the life of the reducer, how to develop an information module capable of finite element analysis for gear shaft parts, saving analysis The time spent on the previous series of work to improve the efficiency of the analysis is a problem worth studying.
The research of this paper is to explore the secondary development function of ANSYS software. VC++ is used as the program development platform. Using APDL language based on VC++ and ANSYS interface technology, the finite element analysis application program of gear reducer gear shaft is developed to realize the finite element analysis of gear shaft. The informationization of parametric modeling and finite element analysis truly reflects the characteristics of computer-aided design systems to improve product design efficiency and design quality, and also frees designers from heavy design.
2 Finite element analysis process In the finite element analysis process, three basic module preprocessing modules, analytical calculation solution modules and post-processing modules are mainly applied. The preprocessing module provides a powerful entity modeling and meshing tool. Users can easily construct finite element models to implement parameter definition, solid modeling and meshing. In the analytical calculation solution module, the finite element of the model is solved by defining the type of analysis, the options of the analysis, the load data, and the load step options. For the post-processing module, it is mainly used to view the mechanical model of the gear shaft, which is one of the keys to realize the finite element analysis of the gear shaft of the reducer. For the gear shaft of the secondary reducer, there are mainly three input shafts, intermediate shafts and output shafts. Each shaft has two bearings supported on the casing. One of the bearings limits the gear shaft space to 5 degrees of freedom and allows rotation. The other bearing limits the four-degree of freedom of the gear shaft space, allowing for axial movement while allowing rotation. Therefore, the gear shaft is simplified into a simply supported beam structure when the mechanical model of the gear shaft is established. For the input shaft, one end of the shaft is extended to mount the coupling or the pulley receives the torque of the prime mover input. The other end of the mounting gear is subjected to the axial force and the circumferential force from the intermediate shaft gear; for the intermediate shaft, between the two bearings Two gears are mounted, which are respectively received by the axial force and the circumferential force transmitted from the input shaft and the output shaft. For the output shaft J, one end is extended through the coupling, and the other end of the power output is the mounting gear. Below we take the input shaft of the reducer as an example to introduce the force of the gear shaft.
Assume that the transmission power of the gear shaft is P. The rotational speed is n. The helical gear indexing circle has a helix angle of /3. The standard pressure angle is "the pinion indexing circle diameter is d, and the torque of the gear shaft is T=9.55X106P/ n For spur gears, the respective forces transmitted by the gear shaft by the gear are: circumferential force radial force: r = Fttanad For the helical gear, the respective forces transmitted by the gear shaft by the gear are: circumferential force force f>Fttan!d radial force is the normal pressure of the normal pressure angle and its direction, according to the size of the gear shaft and the magnitude and direction of the force applied to the shaft by the gear. According to the above description, the final simplification The mechanical model of the input shaft is shown in 圄2.
4 VC++-based secondary development of ANSYS 4.1 ANSYS secondary development tools ANSYS itself provides the following secondary development tools: macro is a combination of commands with a special function is essentially a parameterized user small 'program, Can be used as ANSYS command processing, can have input parameters or no parameter macro program file can also be called command file through the macro program can create their own commands to facilitate the use of ANSYS.
APDL is a parametric design interpretive language very similar to FORTRAN77, which is the basis for secondary development of ANSYS. As an explanatory language, users can use the program language of APDL and macro technology organization management ANSYS finite element analysis command to organize and write a parameterized user program, and become a versatile finite element analysis. The whole process of finite element analysis of the model is realized, that is, the parameterized analysis model, the parameterized material property definition, the parameterized mesh division and size control, the parameterized loading and boundary condition constraints, the parameterized analysis type control and Solving and parameterized post processing.
The UIDL language is a special design language provided by ANSYS to provide users with the ability to write or modify the ANSYS graphical interface, allowing users to change the ANSYS user interface (some components of the GUI to help users implement the ANSYS graphical user interface (GUI). Customization to integrate user-developed programs into the ANSYS environment.
Liu Guoqing Yang Qingdong. ANSYS Engineering Application Tutorial-Mechanical Beijing: China Railway Publishing House, 003. Yan Lianggui, Ji Minggang Mechanical Design (6th Edition). Beijing Higher Education published Li Qingzhong, Yu Xiukun Li Jingchun, and so on. Finite element analysis of the reducer drive gear shaft. Journal of Shenyang Dirty Industry College, 000 Yang Jun Li Feng is based on the structural optimization design of APDL language module. Construction technology Li Xinpo, Yuan Wenzhong. ANSYS structural calculation secondary development technology research and application (editing enlightenment) enterprise information.
Wu Bo (1962-) male professor is mainly engaged in advanced mechanical design technology, mechanical reliability and maintainability technology, and enterprise information technology.
Received after the deadline 2006-
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