Cqs-550 Road, The Whole Cross-section Of The Ballast Cleaning Machine Frame Structure, And Modal Analysis

The structural and modal analysis of vehicle frames is one of the important topics in the field of automotive design and research. The rationality of a vehicle frame directly plays an important part in giving entire vehicle performance. With the rapid development of computer science and technology, numerical simulation by means of the finite element has become a more and more important method in the structural design of vehicle frames. Through the numerical simulation, vehicle frame's distribution of stress and strain and vibration characteristics under various working conditions can be understood roundly, which provides a scientific basis for a designer's structural design, improves the design quality and reduces the design cycle and cost.The CQS-550 full section ballast cleaning machine is a kind of large railway maintenance machinery designed by china railway large maintenance machinery co. Kunming. Under the condition of without dismantling track arrangement, the machine moves excavation chain and digs out ballast from under track arrangement and screen. The screened dirty ballast delivers to both of side railway line or material transport wagon. The machine has new ballast recollect unit. By help of material transport wagon, it changes all ballast for hard and frost boil areas.This article mainly carries on the frame's structural and modal analysis of the CQS-550 full section ballast cleaning machine, which the enterprise faces in the progress of practical production and application. So it is very significant to conduct the in-depth research. This article takes the finite element as the foundation, combined with modern computer technology. The finite element model of the vehicle frame is established by means of the large FEM analysis software ANSYS, in which tetrahedron and hexahedron are used. Based on this model, the static and modal analysis is carried out. For static characteristics, the distribution of stress and displacement under the static working condition is worked out. The position of the biggest stress concentration is found, which is on the lateral support plate connecting two carlings. The biggest stress value is 55.8Mpa. The comments for further improvements are given. For dynamic characteristics, in order to reduce the frame vibration and make the structure more reasonable, modal analysis under free restraint of the vehicle frame is taken and frame's first 16 step natural frequencies and inherent modes of vibration are obtained. Through the analysis of their natural frequencies and modes, three weak positions are found, which possibly appear under dynamic drives, and the appraisal of its performance is put forward. It also proposes general control methods of the frame vibration. The vehicle frame meets the requirement of intensity and various modes of vibration are smooth, so the structural design of the vehicle frame is quite rational.The findings of this paper not only lay certain foundation for further fundamental theory research, essential information and conditions for a designer's structural improvement, but also have some value of the reference and project application.