基于高速开关阀的液力变矩器锁止控制系统

分析了液力变矩器锁止工作机理,为实现液力变矩器锁止功能,设计了以高速开关阀为主的液力变矩器锁止离合器液压控制系统。在液力变矩器锁止过程中,设计的模糊控制器减少了锁止离合器接合冲击、减少滑磨损耗,保证了发动机的稳定运转。

装载机多路阀气动操纵系统设计

论述了装载机现行的操纵机构,对液压先导操纵阀的应用局限性进行了分析。介绍了气动助力器的工作原理,通过对操纵手柄上的期望力的分析计算获得满足性能要求的操纵力。装载机操纵机构借助助力器的助力作用,可以用较小的操纵力对装载机进行轻松操纵,从而使操作轻便灵活。

复合控制数字变量泵的特性分析

设计了一种基于矢量控制与高速开关阀控制的数字变量泵的系统简图,提出了数字变量泵的控制方案,建立了数字变量泵的数学模型,根据控制方案及数学模型,利用AMEsim与Simulink软件搭建了数字变量泵的联合仿真模型,并分析了不同转速增益、外加负载、控制流量对数字变量泵动态特性的影响。结果表明,设计的数字变量泵总体性能有较大幅度的提升,变量范围宽,控制精度高,响应速度快,且节能效果较为理想。

Numerical Simulation on a Throttle Governing System with Hydraulic Butterfly Valves in a Marine Environment

Hydraulic butterfly valves have been widely applied in marine engineering because of their large switching torque, low pressure loss and suitability for large and medium diameter pipelines. Due to control problems resulting from switching angular speeds of the hydraulic butterfly valve, a throttle-governing control mode has been widely adopted, and detailed analysis has been carried out worldwide on the structural principle concerning speed-regulation and the load torque on the shaft while opening or closing a hydraulic butterfly valve. However relevant reports have yet been published on the change law, the error and the influencing factors of the rotational angular velocity of the hydraulic butterfly valve while opening and closing. In this article, research was based on some common specifications of a hydraulic butterfly valve with a symmetrical valve flap existing in a marine environment. The throttle governing system supplied by the accumulator to achieve the switching of the hydraulic control valve was adopted, and the mathematical models of the system were established in the actual conditions while the numerical simulations took place. The simulation results and analysis show that the rotational angular velocity and the error of the hydraulic butterfly valve while switching is influenced greatly by the drainage amount of the accumulator, resulting in pressure loss in the pipeline, the temperature of hydraulic medium and the load of the hydraulic butterfly valve. The simulation results and analysis provide a theoretical basis for the choice of the total capacity of the accumulator and pipeline diameters in a throttle governing system with a hydraulic butterfly valve.It also determines the type and specification of the hydraulic butterfly valve and the design of motion parameters of the transported fluid.

装载机多路阀操纵系统改进设计

论述了装载机现行的操纵机构,分析了液压先导操纵阀的应用局限性。介绍了气动助力器的工作原理,通过对操纵杆上的期望力分析计算获得满足性能要求的操纵力。装载机操纵机构借助助力器的助力作用,可以用较小的操纵力对装载机进行轻松操纵,从而使操作轻便灵活。