单钢轮振动压路机启动过程动态特性研究

发布时间：2018-04-30 14:14

本文选题：振动压路机 + 行走系统　；参考：《长安大学》2014年硕士论文

【摘要】：全液压双驱单钢轮振动压路机的作业性能好、动力性能强，能在多种复杂工况下工作，已广泛应用于路基基层与底基层的压实，市场占有率逐年增大。国产的双驱单钢轮振动压路机发展起步晚，整机质量在不断提高，但存在的缺陷不容忽视，比如发动机动态功率消耗较高、起步起振困难、工作参数不稳定、液压系统压力冲击和发动机掉速严重等，，因此提高国产单钢轮振动压路机的各项性能具有十分重要的现实意义。理论分析能够揭示事物的本质，清晰反映各影响因素间的关系；试验研究能够验证理论模型的合理性与精确性。本文以理论分析为基础、试验研究为手段，将国产某型号单钢轮振动压路机作为研究对象，对压路机行走系统、振动系统和整机动力系统在启动过程中的动态特性展开研究。通过建立压路机行走系统、振动系统和整机动力系统在启动过程的数学模型，发现压路机行走系统在起步过程的动态特性与加速惯性负载有关，且加速度越大，动态性能变化越明显；振动系统在启动过程的动态特性主要受惯性负载影响，且振动马达旋转角加速度越大，系统各项性能波动越剧烈；整机在起步起振过程中的动态瞬时功率消耗较高，发动机掉速严重。通过样机试验发现，压路机行走系统、振动系统以及整机动力系统在启动过程中均存在压力冲击和发动机掉速现象。压力冲击会严重影响发动机和液压元器件的可靠性和使用寿命，因此必须抑制压路机在启动过程中过大的惯性负载。将压路机行走系统、振动系统和整机动力系统在启动过程的各项工作参数带入理论分析建立的数学模型中，将计算所得结果与通过试验读取的数据相比较，验证所建立的理论模型，并分析两种结果产生差距的原因。针对液压系统压力冲击和发动机掉速问题，介绍了三种有效抑制惯性负荷的控制技术。本文建立的压路机行走系统、振动系统以及整机动力系统在启动过程的数学模型，以及研究得到的相关结论，可为压路机的设计和使用以及进一步研究压路机的动态特性提供参考。
[Abstract]:The hydraulic double drive single wheel vibratory roller has good working performance and strong dynamic performance. It can work under many complicated working conditions. It has been widely used in compaction of subgrade base and bottom base, and the market share has increased year by year. The domestic double-drive single-wheel vibratory roller developed late and the quality of the whole machine was continuously improved. However, the defects can not be ignored, such as the high consumption of dynamic power of engine, the difficulty of starting vibration, the unstable working parameters, the high consumption of engine dynamic power, the difficulty of starting vibration, and the instability of working parameters. The pressure impact of hydraulic system and the speed drop of engine are serious, so it is very important to improve the performance of the single steel wheel vibratory roller made in China. The theoretical analysis can reveal the essence of things and clearly reflect the relationship among the influencing factors, and the experimental study can verify the rationality and accuracy of the theoretical model. Based on theoretical analysis and experimental study, the dynamic characteristics of roller walking system, vibration system and dynamic system of whole machine during start-up are studied in this paper by taking a single steel wheel vibratory roller made in China as the object of study. By establishing the mathematical models of the roller walking system, the vibration system and the whole machine power system in the starting process, it is found that the dynamic characteristics of the roller walking system in the starting process are related to the acceleration inertia load, and the acceleration is greater. The more obvious the change of dynamic performance is, the more the dynamic characteristic of vibration system is affected by inertial load, and the greater the angular acceleration of vibration motor is, the more violent the fluctuation of system performance is. The dynamic instantaneous power consumption of the whole machine in the starting process is high, and the engine speed drop is serious. Through the prototype test, it is found that there are pressure shock and engine speed drop in the starting process of the roller walking system, vibration system and the whole engine power system. Pressure shock will seriously affect the reliability and service life of engine and hydraulic components, so it is necessary to restrain the excessive inertia load in the starting process of the roller. The working parameters of the roller walking system, the vibration system and the whole engine power system in the starting process are introduced into the mathematical model established by theoretical analysis, and the calculated results are compared with the data read through the experiment. Verify the established theoretical model and analyze the causes of the gap between the two results. Aiming at the problems of hydraulic system pressure impact and engine speed drop, three effective control techniques for restraining inertia load are introduced. The mathematical models of the roller walking system, vibration system and the whole engine power system in the starting process are established in this paper, as well as the relevant conclusions of the research. It can provide reference for the design and application of roller and the further study of dynamic characteristics of roller.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U415.521

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