Abstract:

Objective In the textile workshop, the handling of full rolls of fabric sticks is a key and difficult problem. There are design problems in the existing fabric unloading vehicle, which cause it to consume a lot of energy in the process of handling to overcome its own weight, and the poor stability of the vehicle body also affects the transportation efficiency. Therefore, it is of great significance to optimize the vehicle body structure of the fabric unloading vehicle to achieve the design goals of equal strength, light weight and high stability.
Method Aiming at the problems such as high body weight and poor stability, a system-level optimization method was introduced to improve the anti-torsional performance and the uniformity of modal natural frequency distribution and eliminate the potential stress concentration by optimizing the overall design, material and layout of the vehicle body. At the same time, considering several working conditions, the topological optimization method is utilized to adjust the material distribution, which can meet the requirements of structural strength and stiffness to the maximum extent and reduce the weight of the vehicle body. The comprehensive application of these optimization methods provides a new idea for the precise design and efficient optimization of the vehicle body structure of the fabric unloading vehicle.
Results This paper introduces a comprehensive optimization methodology addressing vehicle body weight, stability, and the design of a specialized fabric unloading vehicle. By meticulously optimizing the vehicle body's structure, materials, and layout, improvements in anti-torsional resilience and modal frequency distribution uniformity are achieved, effectively eliminating stress concentration. This systematic approach combines vehicle body optimization principles with the specialized requirements of fabric unloading vehicles, enhancing their performance and structural integrity in industrial applications. system-level optimization method, this paper optimizes the vehicle body of the fabric unloading vehicle, finds the most dangerous working condition under 5 working conditions, and then carries out topology optimization to achieve the design of equal strength, lightweight and high stability of the vehicle body. After simulation verification, according to the comparison results, it is shown that after optimization, the first five order natural frequency of the vehicle body is significantly increased, which reduces the potential risk of the falling vehicle being affected by vibration during driving, and thus improves the stability of the vehicle body. The optimized vehicle body uses less material under the same load, while its strength, stiffness and stability are significantly improved. Compared to the original design, the optimized solution not only achieves a 32.5% reduction in vehicle body weight. The static stiffness analysis results of the optimized vehicle body are compared. It can be seen that the maximum stress of the optimized vehicle body is reduced by 23.3%, which fully meets the allowable stress conditions and approaches to the allowable stress, thus improving the utilization rate of materials. After optimization, the maximum deformation of the vehicle body is reduced by 60.3%, and the maximum displacement of the frame is reduced by 9%, that is, the stiffness of the vehicle body is enhanced. This shows that the system level optimization scheme considering the loading condition is feasible.
Conclusion The proposed optimization method not only significantly improves the performance of the vehicle body structure, but also provides a new optimization idea for related fields, which has certain practical value and theoretical guidance. However, the specific details and complexity of the working conditions, may be ignored, resulting in the simulation results are not accurate enough, and the description has certain limitations. Therefore, in order to improve the accuracy of the research results, it is necessary to further explore the specific effects of specific conditions. Subsequently, more types and quantities of working conditions are considered, and the influence of factors such as different heights and angles is considered in the loading and unloading process, so as to simulate the actual working scene more comprehensively. At the same time, the load calculation process is refined, considering the influence of the power arm length, the shape of the hook, the friction between the hook and the cloth, etc., so as to simulate the actual loading situation more accurately. Furthermore, a more refined simulation model is introduced, such as considering the influence of factors such as the speed change of the cloth hook in the process of resetting, the friction between the fabric and the fabric cart, so as to improve the accuracy of the simulation and make the optimized results more accurate and reasonable.

Key words: vehicle body structure, lightweight, mechanical analysis, multiple load cases, topology optimization, simulation analysis, fabric unloading vehicle