双向缓冲负荷传感大流量放大全液压转向系统静动态特性研究

发布时间：2018-11-06 13:29

【摘要】：全液压转向器作为一种输出功率较大的全助力转向器,广泛应用于大型工程机械。传统的依靠增加内部通流面积来提高排量的转向器,体积过大、安装不便,而具有流量放大功能的同轴流量放大转向器依然存转向冲击振动的问题,同时流量放大倍数不够高。双向缓冲负荷传感大流量放大全液压转向器是为了解决上述问题而设计的新型全液压转向器。由该转向器组成的转向系统具有排量大、功率高、转向稳定的优点。为了进一步优化其静动态性能,本论文将对该转向系统的静动态性能进行仿真分析和研究,提出转向器的改进设计措施及结构方案。目前,对液压转向系统的静动态特性进行研究比较经济、有效、实用的方法是运用相关的计算机软件进行仿真分析。液压转向系统静动态特性的仿真分析能有效缩短设计周期,避免重复试验及加工从而降低成本。同时在设计阶段就能及时、准确地预测转向系统的静动态性能,从而为转向系统的调试节省时间,还可以通过仿真分析更加深入地了解所设计转向系统的各项性能。本论文首先分析了双向缓冲负荷传感大流量放大全液压转向系统的工作原理及系统的元件组成。运用流量连续方程和力平衡方程建立了液压转向系统的静态和动态数学模型,并进行了系统的静态特性分析。在液压转向系统动态数学模型的基础上,根据系统的工作原理,在具有液压专业特点的MSC.Easy5仿真软件中,建立了各个元器件的仿真模型,并根据各组成部分的关系建立了整个转向系统的仿真模型。在输入转向阶跃信号下,仿真分析双向缓冲负荷传感大流量放大全液压转向系统的动态特性。根据仿真分析的结论提出转向器的结构优化方案,并将结构优化后的样机实测实验性能参数与结构优化后的仿真性能参数对比分析。结果表明,该转向系统可以使转向器输出流量放大4倍,并且具有双向缓冲和转向稳定的良好性能。这些仿真分析结论对进一步的产品升级和优化设计具有非常重要的指导意义和参考价值。
[Abstract]:As a full-power steering gear with high output power, full-hydraulic steering gear is widely used in large-scale construction machinery. The traditional steering gear which depends on increasing the internal flow passage area to improve the displacement is too large in volume and inconvenient to install. However the coaxial flow amplification steering gear with the function of flow amplification still has the problem of steering shock vibration and the flow amplification ratio is not high enough at the same time. A new type of full hydraulic steering gear is designed to solve the above problems. The steering system composed of the steering gear has the advantages of large displacement, high power and stable steering. In order to further optimize the static and dynamic performance of the steering system, the static and dynamic performance of the steering system is simulated and analyzed, and the improved design measures and structural scheme of the steering gear are put forward. At present, it is economical, effective and practical to study the static and dynamic characteristics of hydraulic steering system. The simulation analysis of static and dynamic characteristics of hydraulic steering system can effectively shorten the design cycle, avoid repeated tests and processing, and thus reduce the cost. At the same time, the static and dynamic performance of the steering system can be predicted in time and accurately in the design stage, thus saving time for the debugging of the steering system, and the performance of the steering system can be further understood through simulation analysis. In this paper, the principle and components of the full hydraulic steering system with bidirectional buffering load sensing and large flow amplification are analyzed. The static and dynamic mathematical models of the hydraulic steering system are established by using the flow continuity equation and the force balance equation, and the static characteristics of the system are analyzed. On the basis of the dynamic mathematical model of hydraulic steering system, according to the working principle of the system, the simulation model of each component is established in the MSC.Easy5 simulation software with hydraulic specialty characteristics. The simulation model of the whole steering system is established according to the relation of each component. Under the input steering step signal, the dynamic characteristics of a bidirectional buffer load sensing and amplifying full hydraulic steering system are simulated and analyzed. According to the conclusion of simulation analysis, the structure optimization scheme of steering gear is put forward, and the measured experimental performance parameters after structural optimization are compared with the simulation performance parameters after structural optimization. The results show that the steering system can amplify the output flow of the steering gear by 4 times and has good performance of bidirectional buffering and steering stability. These conclusions of simulation analysis have very important guiding significance and reference value for further product upgrading and optimization design.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137

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