轴流导叶可调液力变矩器性能及应用研究
发布时间：2018-11-09 14:00
【摘要】：随着经济建设的发展,铲土运输机械在工程建设中的使用越来越广泛。在全球提倡节能、减排、降耗的背景下,装载机作为一种重要的铲土运输机械设备,提高其整机性能,实现节能已成为未来发展的一种必然趋势。目前大多数装载机的动力传动系统仍以液力传动系统为主,在液力传动系统中,发动机与液力变矩器之间匹配的好坏是影响整机性能的重要因素。通常装载机上所用液力变矩器的能容特性是固定不变的,面对装载机复杂多变的作业工况,无论采取何种匹配方式,都不能同时满足不同作业工况对于匹配性能的要求。若可以设计出一种能容特性连续可变的液力变矩器,并将其应用于装载机中来解决发动机与变矩器之间的动态匹配问题,则可以有效地改善匹配性能,进而提高整机性能。基于此种需求,本文以某7吨装载机为应用对象,提出并设计了一种能容连续可调的新型轴流导叶可调液力变矩器,并对其性能及其在装载机上的应用进行了研究。主要研究内容如下。(1)采用相似设计法和“两圆弧+直线”的方法确定了直径为370mm轴流导叶可调液力变矩器的循环圆。运用等倾角射影法设计了轴流导叶可调液力变矩器的泵轮和涡轮叶片,根据可调导轮结构的需要,设计了轴流导轮叶片。为了实现导轮叶片的转动,设计了导叶调节机构,并制定了导叶开度的变化范围,得到了轴流导叶可调液力变矩器的总体结构。运用CFD技术对轴流导叶可调液力变矩器进行了数值模拟仿真计算,分析了其整体内部流场和可调导轮内部流场的分布情况。获得了轴流导叶可调液力变矩器的原始特性,并对其不同导叶开度下的性能进行了重点研究。(2)基于某7吨装载机动力传动系统和整机参数,建立了发动机和轴流导叶可调液力变矩器的数学模型。分析了发动机和轴流导叶可调液力变矩器在行驶工况和作业工况下的共同工作输入特性、共同工作输出特性和共同工作点的变化范围,并与原机进行了对比。根据共同工作匹配特性,计算了行驶工况下装载机的牵引力、最大车速、加速时间、爬坡度和百公里燃油消耗量,并与原机进行了对比分析。结果表明,换装轴流导叶可调液力变矩器后,可以显著地提高装载机在行驶工况下的整机性能。(3)通过某7吨装载机对砂石料进行的V型铲装作业循环测试试验,获得了一个作业循环时间内发动机油门、车速和发动机功率扣除随着时间的变化情况。以这些测试数据为基础,采用MATLAB/Simulink搭建了原装液力变矩器动态仿真模型。为了获得换装轴流导叶可调液力变矩器后装载机整机性能的动态变化,根据最佳匹配原则,制定了可调导叶开度的控制策略,同样采用MATLAB/Simulink搭建了轴流导叶可调液力变矩器的动态仿真模型,并将其仿真结果与原装液力变矩器动态仿真模型的仿真结果进行了比较。通过对比分析,换装轴流导叶可调液力变矩器后,装载机的整机性能得到了提高。
[Abstract]:With the development of the economic construction, the use of the shovel-soil transport machinery in the project construction is becoming more and more extensive. In the background of the global promotion of energy conservation, emission reduction and environmental protection, the loader, as an important shovel-soil transportation mechanical equipment, can improve the performance of the whole machine, and realize the energy-saving has become an inevitable trend of the future development. At present, most of the power transmission system of the loader is still the hydraulic transmission system. In the hydraulic transmission system, the matching between the engine and the torque converter is an important factor affecting the performance of the whole machine. The capacity characteristic of the hydraulic torque converter used in the general loader is fixed, and the requirements of different working conditions on the matching performance can not be met at the same time, regardless of the matching method adopted by the loader. If a hydraulic torque converter with continuous variable capacity can be designed and applied to the loader to solve the dynamic matching problem between the engine and the torque converter, the matching performance can be effectively improved, and the performance of the whole machine can be improved. Based on this demand, this paper presents and designs a new type of adjustable hydraulic torque converter with continuous and adjustable capacity in a 7-ton loader, and studies the performance and its application in the loader. The main contents of the study are as follows. (1) The circulation circle of the adjustable hydraulic torque converter with the diameter of 370mm is determined by the method of similar design and 鈥渢wo-arc + straight line鈥，
本文编号：2320619
[Abstract]:With the development of the economic construction, the use of the shovel-soil transport machinery in the project construction is becoming more and more extensive. In the background of the global promotion of energy conservation, emission reduction and environmental protection, the loader, as an important shovel-soil transportation mechanical equipment, can improve the performance of the whole machine, and realize the energy-saving has become an inevitable trend of the future development. At present, most of the power transmission system of the loader is still the hydraulic transmission system. In the hydraulic transmission system, the matching between the engine and the torque converter is an important factor affecting the performance of the whole machine. The capacity characteristic of the hydraulic torque converter used in the general loader is fixed, and the requirements of different working conditions on the matching performance can not be met at the same time, regardless of the matching method adopted by the loader. If a hydraulic torque converter with continuous variable capacity can be designed and applied to the loader to solve the dynamic matching problem between the engine and the torque converter, the matching performance can be effectively improved, and the performance of the whole machine can be improved. Based on this demand, this paper presents and designs a new type of adjustable hydraulic torque converter with continuous and adjustable capacity in a 7-ton loader, and studies the performance and its application in the loader. The main contents of the study are as follows. (1) The circulation circle of the adjustable hydraulic torque converter with the diameter of 370mm is determined by the method of similar design and 鈥渢wo-arc + straight line鈥，
本文编号：2320619
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