Mechanism Analysis and Diagnosis Method of Hydraulic System Fault in Wet Clutch Changing Stage
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摘要: 为了预测一定负载下, 液压机械无级变速器(简称HMCVT)湿式离合器由于液压系统压力、流量脉动使得主从动轴长时间产生较大转速差而一直处于滑摩状态, 导致湿式离合器换段不理想的问题。通过分析液压系统故障形成机理, 利用AMESim搭建湿式离合器液压系统, 模拟注入故障类型, 进行时域特征提取, 提出量子粒子群(QPSO)优化BP神经网络权值、阈值的算法对湿式离合器液压系统进行故障诊断, 提升该系统的诊断效率与诊断精度, 并结合台架试验验证该算法的准确性。研究结果表明: QPSO算法优化BP神经网络的故障诊断算法故障识别率高, 算法具有更高的收敛精度及收敛速度, 研究结果为设计拖拉机HMCVT的故障自诊断系统提供理论参考以及工程开发思路。
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关键词:
- HMCVT湿式离合器 /
- 液压系统 /
- QPSO优化BP算法 /
- AMEsim建模 /
- 时域特征提取
Abstract: Aiming at the problem that under a certain load, due to the pressure and flow pulsation of the hydraulic system of the hydraulic mechanical continuously variable transmission (HMCVT) wet clutch, and the winner of the driven shaft for a long time to produce a large speed difference and being in the state of sliding friction, these lead to the wet clutch change is not ideal. By analyzing the fault formation mechanism of wet clutch hydraulic system, modeled hydraulic system failure using AMESim structures, and simulating the fault injection and extracting the time domain feature, the quantum particle swarm optimization (QPSO) algorithm of BP neural network weights and threshold of wet clutch hydraulic system fault diagnosis are put forward to improve the diagnostic efficiency and diagnostic accuracy of the system, and finally validating the accuracy of the algorithm though the bench experiment. The results show that the QPSO algorithm has higher fault recognition rate, higher convergence accuracy and higher convergence speed. The research results provide theoretical reference and engineering development ideas for the design of tractor HMCVT fault self-diagnosis system. -
表 1 C1离合器内部参数表
参数 数值 盘片数z 5 活塞外径r1/mm 196 活塞内径r0/mm 174 摩擦片外径R1/mm 198 摩擦片内径R0/mm 165 动摩擦系数μs 1.1 活塞最大行程/mm 2 
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表 2 故障注入参数表
故障状态 故障源 故障描述 模拟故障参数 Y1 换段电磁阀阀芯卡滞 x 换段不理想 Y2 溢流阀阻尼孔堵塞故障 D Y3 液压系统泄露 k Y4 过滤器堵塞故障 d
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表 4 试验设备
试验设备 型号种类 基本参数 液压齿轮泵 HGP-1A-F6R 额定排量6 cc/rev 驱动电机 CNS2934 额定转速1 430 r/min 溢流阀 海德福斯RV08-20 调压范围为6.9~75.86 bar 换段电磁阀 海德福斯SV38-30 额定工作压力207 bar 节流阀 FRIA-05-2RP 额定工作压力240 bar 过滤器 - - 发动机 道依茨TCD2013L062V 额定转速2 300 r/min 电涡流测功机 DW250 最高吸收功率250 kW
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表 5 试验结果对照表
预测失误组 BP PSO-BP QPSO-BP 预测值 期望值 预测值 期望值 预测值 期望值 第2组液压系统泄露故障 0.19 0 0.16 0 0.06 0 0.31 0 0.29 0 0.14 0 0.33 0 0.43 0 0.08 0 0.07 0 0.03 0 0.01 0 0.10 1 0.09 1 0.71 1 第40组溢流阀阻尼孔堵塞 0.17 0 0.19 0 0.09 0 0.10 0 0.16 0 0.0 0 0.42 0 0.43 0 0.69 0 0.26 1 0.15 1 0.13 1 0.05 0 0.07 0 0.04 0
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