Method for determining dual-layer top cover of motor coach with top-positioned gas cylinder

Abstract

A method for determining a dual-layer top cover of a motor coach with a top-positioned gas cylinder comprises topology optimization, initial structure design, section optimization, anti-overturn stability analysis and fatigue analysis. According to the design requirement, the topology optimization design based on conditions such as bearing capability, shape, power distribution and the like is carried out, thus obtaining an initial space structure of the top cover; subsequently, the section optimization is carried out to the initial space structure and the structure improving design is carriedout so that the improved structure meets the low-order vibration performance and static performance on stiffness and strength; subsequently, the anti-overturn analysis and fatigue analysis are carried out on the improved structure so as to ensure nonoccurrence of gas leakage problem due to damaged gas cylinder under the overturn working condition of the motor coach with top-positioned gas cylinder, ensure the fatigue durability of the structure of the whole coach, and ensure that the top cover of the motor coach with the top-positioned gas cylinder meets the low-order vibration performance, static performance on stiffness and strength and safety and durability under the overturn working condition. The method simplifies the workload, improves the success rate of product development and shortens development period.

Description

technical field [0001] The invention belongs to the field of mechanical design and relates to a method for designing a bus, in particular to design the lightest roof structure on the premise of ensuring the corresponding technical indicators of the bus. Background technique [0002] At present, the design method of foreign overhead gas cylinder buses is: preliminary structural design according to the reference prototype → CAE analysis and improved design by finite element method → ​​sample vehicle design → performance test → structural improvement, domestic overhead gas cylinder buses The design method is: preliminary structural design according to the reference prototype → prototype design → performance test → structural improvement. The initial structural design methods of these two methods largely rely on the experience of the reference prototype and the designer. The shape, structure layout and performance matching are compared with the reference prototype, which is subj...

AI Technical Summary

Problems solved by technology

The top cover of the overhead gas cylinder designed by this method often has a structure that is too strong, does not meet the lightweight requirements of the vehicle body, or is not safe enough, such as the leakage safety caused by the intrusion of the overhead gas cylinder installation structure due to rollover. sexual problems

On the other hand, compared with traditional buses, buses with overhead gas cylinders have a higher center of gravity due to the fact that the gas cylinders are placed on top, so this type of bus is more prone to rollover than traditional buses, and the danger of rollover is greater

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