电液泵控差动缸的动态控制

该文针对电液泵控差动缸系统常出现的超压、气蚀问题,提出了二位三通电磁换向阀的动态补偿控制,以平衡差动缸动态过程中流量的不对称,设计了控制系统,通过MATLAB7．6／Simulink—Simscape对系统进行了建模仿真,得出了系统在不同频率的正弦信号和阶跃信号下的位移跟踪特性曲线以及差动缸两腔压力响应曲线,并对仿真结果进行了分析。     

恒功率恒压泵变量机构原理分析及研究

该文以A11V-LRD恒功率恒压泵为研究对象,介绍了压力切断和恒功率两种控制方式工作时的协同关系,重点研究了其内部变量机构的结构和工作原理;依据原理分析所得的推理结果与测试台做试验得出的数据十分符合。     

应用进出油口独立控制原理改善泵控差动缸系统效率

针对新型双调速泵控制的差动缸电液伺服系统,特别是应用于注塑机锁模机构的情况进行了研究。在总压力和腔压力控制的基础上,进一步提出应用缸进口和出口独立控制的思想,使缸在运动过程中,背压保持较低的值,系统的压力始终与负载相适应,在满足系统动静态特性的同时,可充分发挥每台电动机的功率能力,同时降低了系统本身的能量消耗和液压泵的发热,减小电动机功率损失近20％,研究工作得到了仿真和试验验证。     

定转速伺服变量泵直控差动缸系统仿真与试验研究

以定转速变排量型泵控差动缸系统为研究对象,对系统进行理论分析,在仿真软件Simulation X中建立系统的仿真模型,对定转速伺服变量泵直控差动缸系统的位置控制特性进行仿真研究。搭建试验平台,用试验的手段对仿真结果进行验证,试验结果验证了仿真结果的正确性。仿真和试验结果表明,定转速伺服变量泵直接控制差动缸系统控制特性较好,为推广应用泵控系统提供了一定的技术支持。     

吹瓶机和注塑机的锁模机构综述

合（锁）模机构是吹瓶（塑）机、注塑机的重要构件之一。介绍了一些典型的锁模机构的结构、原理、特点及应用,并对这些机构进行了比较分析,对开发其它领域中的锁模机构具有参考价值。     

基于ANSYS的注塑机结构分析及动模板优化设计

以某型号注塑机为研究对象,在Pro/E和ANSYS协同设计分析环境下,对注塑机锁模机构进行整体建模及分析。分析结果显示动模板在150kN的锁模压力下变形和应力变化较大。根据有限元分析结果,利用ANSYS优化模板对动模板结构进行优化设计,优化后的动模板的应力以及变形显著降低,对产品性能的改进起到了良好的指导作用。     

PCP(泵控泵)原理及应用

注水是油田稳产的基础技术手段,特别是油田开发中后期,没有注水就没有原油产量。注水电耗已占原油生产总用电的33％～56％,注水对油田采收率、生产成本和生产效率有重大影响。该文介绍了PCP系统工作原理,采用先进的Pump-Control-Pump（简称PCP）技术,开发了一套完整的PCP技术设备,实现了注水压流可调和节能,在全国各大油田获得了广泛应用。     

泵试验回路阻力计算和应用北大核心

本文阐述泵试验回路的阻力计算方法。通过实际的计算实例列举了阻力计算在泵试验回路设计中的演绎应用,总结了试验回路阻力计算对回路实际流量测量的影响。     

高低压蓄能器在回转泵控液压系统中应用及仿真

为了提高挖掘机回转系统的运行稳定性,通过引入高低压蓄能器的方式提出了一种回转泵控液压系统,通过相互协同的方式来实现泵控过程,并在Simulink 平台开展了仿真分析。结果表明:单蓄能器和双蓄能器在各运动阶段和泵输出功率基本一致,形成了相同的能量释放与保持特性。相对于单蓄能器,双蓄能器回转系统缩短了约0.5 s的制动时间。高压蓄能器形成较小的油液充放范围,但能够达到较高压力,同时低压蓄能器起到弥补高压蓄能器体积偏小问题。减速制动时,高压蓄能器升高到最大压力后高低压蓄能器开始回收能量,可以更加高效回收能量,显著缩短制动时间。该系统的液压系统设计具有能量回收以及系统自动补油的功能,表现出很好的节能高效性能,对提高挖掘机液压系统运行效率具有一定的理论意义。     

混凝土泵车用变量泵控制原理及故障排查两例

详细阐述一种斜盘式轴向柱塞变量泵压力切断控制、恒功率控制、电比例排量控制三种控制方式的工作原理,并列举两起故障案例和故障排查方法.为进一步开发新型变量泵和现场变量泵故障排除提供参考.     

IMPROVE THE KINETIC PERFORMANCE OF THE PUMP CONTROLLED CLAMPING UNIT IN PLASTIC INJECTION MOLDING MACHINE WITH ADAPTIVE CONTROL STRATEGY

The kinetic characteristics of the clamping unit of plastic injection molding machine that is controlled by close loop with newly developed double speed variable pump unit are investigated. Considering the wide variation of the cylinder equivalent mass caused by the transmission ratio of clamping unit and the severe instantaneous impact force acted on the cylinder during the mold closing and opening process, an adaptive control principle of parameter and structure is proposed to improve its kinetic performance. The adaptive correlation between the acceleration feedback gain and the variable mass is derived. The pressure differential feedback is introduced to improve the dynamic performance in the case of small inertia and heavy impact load. The adaptation of sum pressure to load is used to reduce the energy loss of the system. The research results are verified by the simulation and experiment. The investigation method and the conclusions are also suitable for the differential cylinder system controlled by the traditional servo pump unit.     

ADAPTIVE CONTROLLER AND ITS APPLICATION IN FORCE SYSTEM OF ASYMMETRIC CYLINDER CONTROLLED BY SYMMETRIC VALVE

Partial pressure, system vibration and asymmetric system dynamic performance exit in asymmetric cylinder controller by symmetric valve hydraulic system. To solve this problem in the force control system, model reference adaptive controller is designed using equilibrium point stability theory and output error equation polynomial. The reference model is selected in such a way that it meets the system dynamic performance. Hardware configuration of asymmetric cylinder controlled by asymmetric valve hydraulic system is replaced by intelligent control algorithm, thus the cost is lowered and easy to application. Simulation results demonstrate that the proposed adaptive control sheme has good adaptive ability and well solves asymmetric dynamic performance problem. The designed adaptive controller is fairly robust to load disturbance and system parameter variation.     

变量泵源阀控系统的前馈自适应控制方法

变量泵源导致系统开环增益下降和动态变化,传统的反馈控制和串联校正很难使此类系统跟踪精度达到要求应用复合控制方法,可以对开环增益变化进行有效补偿,提高跟踪控制精度。运用MCS-96系列单片机技术、反馈控制、前馈控制和自适应控制原理,开发设计了数字控制器,实现了对系统的前馈自适应数字控制。试验研究结果表明,前馈自适应控制是实现变量泵源阀控系统高精度跟踪控制的有效方法。     

基于误差多项式的模型参考自适应控制在阀控非对称缸系统中的应用

基于误差方程多项式代数法的自适应控制设计理论,其基本思想是使自适应控制误差随时间的推移而趋向于零,它是确保所构成的自适应控制系统在李雅普诺夫意义下是稳定的。以对称阀控非对称缸液压伺服系统为研究对象,给出了适合应用于该系统的自适应控制算法,使系统的输出渐进一致地收敛于参考模型的理想输出,解决了对称滑阀控非对称液压缸系统存在的动态性能不对称,系统精度低,稳定性差,频宽窄和滞后大等问题。     

PRINCIPLE TO CLOSED LOOP CONTROL DIFFERENTIAL CYLINDER WITH DOUBLE SPEED VARIABLE PUMPS AND SINGLE LOOP CONTROL SIGNAL

To control the position of differential cylinder closed loop without using any throttle elements, a new idea that two speed variable pumps are used to compensate the non-symmetric flow of differential cylinder is carried out. According to the leaking property of the system, a speed offset principle is also proposed to eliminate the cavitation and tension caused by the leakage and condensation of oil, which makes the system be in the same state as a valve controlled circuit. This principle is explained theoretically and experimentally. Further the relationship that the pressures in cylinder chambers change with load and leakage, and the relationship between biasing speed and pre-load pressures in cylinder chambers are established. The research has proved that the new system has similar technique features as those of controlled with servo valves, but due to the elimination of all the throttle lose the efficiency of system can be improved greatly.     

基于压力流量复合控制的盾构推进液压系统

推进系统是盾构的关键系统之一。设计了一种基于压力流量复合控制的盾构推进液压系统,对推进液压缸进行了分区控制,阐述了推进液压系统的工作原理及其控制方式。利用AMESim仿真软件对推进液压系统的压力和流量特性进行了仿真分析,并在工程应用中进行了推进试验,仿真和工程实际应用表明所设计的推进液压系统可实时控制推进压力和推进速度,可以满足盾构的掘进要求。