Structural Lightweight And Energy Saving Design On The Mowing Vehicle

With the progress of science and technology and the development of society,the development of resources and energy consumption is also increasing.For vehicles,the total energy consumption has a close relationship with the total weight of the vehicle as well as the energy consumption of each component.Mowing vehicle is widely used in agriculture,gardens and other aspects,so the lightweight and energy saving design on the mowing vehicle is of great significance.In this paper,the riding type mower has the problem of heavy vehicle quality and large energy consumption of cutting table.So,I carry out lightweight design on the unreasonable part of vehicle mechanical structure and the optimal design of air duct and blade shape in the cutting table.In order to reduce the weight and reduce the energy consumption.Firstly,established the 3D model and the finite element model of the frame and the cutting table.It lays the foundation for structural analysis and flow field analysis and optimization.I carried out strength and stiffness analysis under bending and torsion conditions.Analysis results showed that the frame strength and stiffness meet the requirements,and there is a large margin,there is room for optimization.Study on the related theory of lightweight structure design,given the overall scheme of the lightweight on the frame structure of the mowing vehicle.Using ANSYS Workbench to carry out the topology optimization and size optimization.After each optimization,check the strength and stiffness of the modified model,the results showed that the two times optimization all meet the requirements.After the topology optimization,the weight of overall frame loss from 67.075 kg to 59.69 kg,reduced 11% of frame quality,initially achieved good weight loss effect.After the size optimization,the weight of overall frame loss from 59.69 kg to44.053 kg,through the two optimization of a total reduction of 23.022 kg,eventually reduced by34.3%,lightweight design effect is significant.Carried out the real vehicle test,the actual frame weight loss of about 31.25%,the vehicle weight loss of about 5%,meet the use requirements,so achieved the purpose of lightweight.Using FLUENT software,analyzed the flow process of mowing,including the pressure condition of the blade and the cutter head,the speed of the blade and the torque of the blade,provide the basis for the optimization and improvement of the cutter and blade.According to the analysis results,three different improvement schemes are proposed.One is the improvement of cutter head,the scheme two and the other are the improvement of the blade,and the torque of the blade is regarded as the evaluation index of energy saving.The results showed that the blade torque increased in the first scheme,so the first scheme cannot save energy;blade torquedecreased in scheme two and three,scheme two is reduced by about 29%,scheme three decreased by about 18%,reached the purpose of saving energy,but in scheme two,the torque and pressure and speed fluctuations are very large,while the scheme three is relatively stable.Therefore,the comprehensive analysis shows that scheme three is a relatively optimal optimization scheme.And carried on the real vehicle test,the result shows that the overall current is reduced by 3 amperes,the power is reduced by about 216 watts,the energy saving is about 8.5%,so the energy saving purpose is achieved.