| 液力减速器启动过程的瞬态压力脉动分析 |
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| 引用本文： | 刘厚林,张立新,董亮,刘嘉伟.液力减速器启动过程的瞬态压力脉动分析[J].农业工程学报,2020,36(1):67-73. |
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| 作者姓名： | 刘厚林 张立新 董亮 刘嘉伟 |
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| 作者单位： | 江苏大学流体机械工程技术研究中心,镇江 212013;江苏大学流体机械工程技术研究中心,镇江 212013;江苏大学流体机械工程技术研究中心,镇江 212013;江苏大学流体机械工程技术研究中心,镇江 212013 |
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| 基金项目： | 国家自然科学基金（51879122,51779106）；江苏省产学研联合创新资金（BY2016072-01）；江苏省"六大人才高峰"高层次人才项目（GBZB-017）；镇江市重点研发计划（GY2017001，GY2018025）；江苏大学高级人才科研启动基金（15JDG052）；江苏高校优势学科建设工程（PAPD） |
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| 摘 要： | 为研究叶片倾角、充液率对液力减速器启动过程瞬态压力脉动的影响,该文基于INV3020数据采集系统组成的瞬态压力脉动测试系统,对60°、75°、90°共3种叶片倾角和60%、70%、80%、90%、100%共5种充液率工况下的压力脉动信号进行采集。结果表明:不同叶片倾角的液力减速器在启动过程压力脉动峰值所对应的频率均出现在200 Hz以下,压力脉动主要集中于叶频处且随着叶片倾角的增加呈现增大的趋势。不同充液率液力减速器在启动过程压力脉动主要集中于叶频处,在60%~90%充液率工况下,压力脉动幅值随着充液率上升而减小,在90%~100%充液率工况下,随着充液率上升而快速增大。因此,减小叶片倾角和维持充液率在70%~90%下能有效减小压力脉动。研究结果揭示了不同叶片倾角,不同充液率对液力减速器启动瞬态压力脉动的影响规律,可为低振动,低噪声液力减速器的优化设计提供理论依据。
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| 关 键 词： | 压力 模型 液力减速器 充液率 叶片倾角 瞬态 |
| 收稿时间： | 2019/9/16 0:00:00 |
| 修稿时间： | 2019/12/19 0:00:00 |
Analysis of transient pressure pulsation during hydraulic retarder starting process |
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| Liu Houlin,Zhang Lixin,Dong Liang and Liu Jiawei.Analysis of transient pressure pulsation during hydraulic retarder starting process[J].Transactions of the Chinese Society of Agricultural Engineering,2020,36(1):67-73. |
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| Authors: | Liu Houlin Zhang Lixin Dong Liang and Liu Jiawei |
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| Institution: | Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China,Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China,Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China and Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China |
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| Abstract: | Hydraulic retarder is a highly efficient auxiliary brake device in vehicle transmission system. Compared with traditional vehicle braking systems, it can improve braking and transmission thereby improving safety in driving. Being able to independently design and manufacture hydraulic retarders is therefore essential to safeguarding development of vehicle industry for a country. The internal pressure pulsation in the hydraulic retarder is one of important factors that could cause vibrations and noise in a vehicle, while there is limited study on how the transient pressure pulsation changes responsively to the impeller angle and liquid filling rate in the transmission system. The purpose of this paper is to bridge this gap by presenting the results of an experiment study on the impact of the impeller angle and charging rate on transient pressure pulsation in a hydraulic retarder during its starting process. We compared three blade inclination angles: 60°, 75° and 90°, and five liquid filling rate: 60%, 70%, 80%, 90% and 100%, and conducted the experiments in a transient pressure pulsation test system equipped with an INV3020 data acquisition system. The test system included a frequency converter, a drive motor, a hydraulic retarder, a high frequency dynamic pressure sensor, a torque speed collector and a booster pump. During the test, the motor speed was adjusted by the inverter, and the liquid filling rate was adjusted by the inlet ball valve and the outlet ball valve in the hydraulic reducer as well as the booster pump to control water-filling of the hydraulic reducer cavity. The amplitude of the pressure pulsation at the axial frequency and the leaf frequency was analyzed to elucidate the effect of the impeller angle and the liquid filling rate. The results showed that the peaks of the pressure pulsation in the hydraulic retarder under different blade inclination angles occurred below 200 Hz, and the pressure pulsation mainly occurred at the leaf frequency and increased with the blade inclination. The pressure pulsation under different liquid filling rate mainly occurred at the leaf frequency. The amplitude of the pressure pulsation decreased as the charging rate increased from 60% to 90%, and then increased steadily when the charging rate further increased from 90% to 100%. Reducing the impeller angle and maintaining the charging rate at 70%-90% can therefore effectively reduce the pressure pulsation. The results presented in this paper unravel the impact of the impeller angle and charging rate on transient pressure pulsation in the hydraulic retarder, and have important implications for optimal design of low-vibration and low-noisy hydraulic retarders. |
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| Keywords: | pressure models hydraulic retarder liquid filling rate blade inclination angles transient |
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