拖拉机动态载荷加载平台设计与试验

拖拉机作业性能及其可靠性直接影响农业生产效率.针对室内固定试验台结构庞大、成本高、移动负荷车功能单一等问题,设计了一种适用于中小型拖拉机的动态载荷加载平台.该平台可根据拖拉机试验国家标准,完成包括PTO功率、牵引功率和提升能力在内的多项加载试验,还可实现基于不同农机具、土壤条件、作业工况等田间作业载荷谱的动态加载试验,...

Design and Experiment of Dynamic Loading Bench for Tractor

The performance and reliability of tractor directly affect agricultural production efficiency. In view of the low accuracy of the loading control and measurement， single function and inconvenience of the current tractor loading test bench， this paper designed a dynamic loading bench for tractor. The bench not only completed multiple loading tests including PTO power， traction power and lifting capacity based on the national standard of tractor test， but also realized the dynamic loading test of load spectrum， which provided a test platform for the comprehensive detection of tractor performance parameters. In order to verify the dynamic characteristics of the loading platform， taking the tractor PTO loading test as an example， based on the NI-FPGA modular， the static step loading， sinusoidal follow loading and dynamic load spectrum loading tests of the loading bench were carried out. In the load spectrum loading test， the load spectrum prepared in the rotary tillage of TS404 was used as the input signal. The results showed that the maximum delay time was 0.8 s， the maximum overshoot was 9.81%， and the maximum error was 4.78%. The correlation coefficient of load spectrum was 0.997 0， and the goodness of fit was 18.94 N·m. All the results showed that the response time， control accuracy and system overshoot of the PTO loading bench could meet the actual loading needs， which provided the basis and reference for tractor performance and reliability test.