基于虚拟环境下的电液伺服性能测试系统设计

为了满足军事武器系统对液压测试技术的需要,研究了基于LabVIEW虚拟仪器开发平台的液压测试系统的软硬件结构,阐述了软件开发的模块化设计思想理念,介绍了虚拟环境下测试系统的软件实现方法,提出了现代液压测试系统的技术方案。     

变频液压技术在泵测试系统中的应用

本文介绍了变频液压技术的原理及其在泵测试系统中的运用,解决了泵测试系统中转速调节存在的问题,提高了调速精度和系统稳定性,达到了节能的要求。     

基于nRF24AP2的无线液压参数检测系统设计

采用超低功耗的芯片nRF24AP2和单片机构成无线液压检测系统,可以检测液压系统的主要参数温度和压力,阐述了系统软件和硬件设计,并用Visual Basic 6.0为开发液压检测软件,可以实现参数实时检测,并能够实现保存、打印功能。实验表明该系统稳定、操作快捷、性价比高,能够满足液压元件测试要求,可以应用其它到液压系统。     

油缸型式试验测控系统

本文介绍了一种以微机为监测控制中心及数据平台的、用于液压油缸型式试验的数据测控系统，针对液压系统计算机辅助测试系统的硬件构成、软件结构及其功能予以讨论和分析。     

基于AHP故障树分析方法下飞机液压诊断研究

液压系统是飞机上的重要系统,液压传动主要完成主体部件收放、舵面操纵、机轮刹车等.据统计,当前我国军用飞机液压系统的故障约占机械总故障的30%左右.液压系统的维修工作量占机械维修工作量的1/3,由此可见,保持飞机液压系统正常工作状态是系统维修的重要内容.液压故障诊断和诊断的方法很多,本文简述了飞机液压系统故障诊断的基本理...     

上海赛克力光电缆有限责任公司

CTS650A系列对称数字通信电缆测试系统 CTS650A1系列对称数字通信电缆测试系统是适用于高性能数字电缆（CAT5、CAT5e、CAT6、CAT7，CAT8）性能测试的高精度专用测试设备。     

新型液压离合器液压操纵系统性能测试系统的设计

汽车新型液压离合器液压操纵系统几乎100%使用先进的工程塑料,克服了金属离合器总、分泵的缺点,产品可靠性高,耐久性寿命试验达150万次以上。为了能更好地对这种新产品进行研制和性能测试,需要自主开发一种适     

一种面向液压储能器的122 GHz FMCW 测距雷达

针对液压储能器活塞位移测量过程中存在的高温、高压、油污等影响问题,提出了基于122 GHz FMCW 测距雷达的活塞位移测量方案。在分析雷达系统结构和工作原理的基础上,分别对调制信号单元、T/ R 收发单元、调理单元和ARM 实时处理单元进行了详细设计,一方面采用集成设计思路缩小了系统体积,满足了液压储能器内安装测试需求,另一方面通过设计聚焦透镜,提高了122 GHz 毫米波在液压储能器内部的穿透能力。实验结果表明,在2 m 液压储能器活塞测试中,122 GHz FMCW 测距雷达能够耐压30 MPa,测距误差不超过2 cm。     

矿用单轨吊机车液压系统的设计研究

为了得到一种效率高、可靠性强、制动效果好的矿用单轨吊机车液压系统,文章阐述了矿用单轨吊机车液压系统的架构,对矿用单轨吊机车液压系统的设计方案进行了分析。通过在仿真系统中,模拟矿用单轨吊机车液压系统的应用效果可知,通过在闭式回路内科学连接液压系统各部件,可获得可靠性强、驱动效率高、能源损耗少的液压系统。     

掘进机的液压系统设计与分析

掘进机的工作运行与液压技术紧密相关,二者相互促进。掘进机采用液压系统具有许多突出的优点,如结构简单、控制简单、操作简便省力、易于实现自动化、体积小、调速性能好、过载保护性能好等。因此研究掘进机及其液压系统具有重要的意义。本文关于掘进机液压系统的设计主要针对液压系统的回路、元件、工作原理等进行了详细的分析、选型和研究。     

某无人机液压起落架系统建模与仿真

某无人机液压系统主要为起落架的收放提供动力源,对其进行建模仿真能够实现参数和方案的优化,以便获得最佳的设计。基于节点法的集中参数数学建模思想,针对液压系统的动态特性仿真问题,研究了在MATLAB／SIMULINK下面向液压元件的液压系统动态特性仿真模型库的建立问题,建立各液压子系统模型。进行无人机液压起落架仿真,得到起落架收放时间短,达到某无人机起落架对响应时间的要求。     

基于PROFIBUS-DP的环境参数采集系统设计与应用

针对易燃易爆介质生产和存放安全性要求,提出了基于PROFIBUS-DP的环境参数采集系统解决方案,完成了系统结构和控制过程设计.结合PROFIBUS-DP开放式现场总线描述了系统网络通信协议,下位机采用S7-200系列CPU模块和I/O模块构成,上位机采用与设备无关的MCGS作为监控系统,实现了对采集的数据进行集中管理...     

中断概率在TD-LTE信道资源分配中的应用

TD-LTE(时分同步码分多址-长期演进)系统业务呈非对称状态,对下行数据率的要求要超过上行数据率,因而对系统信道上下行资源分配的要求更为严格。文章利用中断概率接纳控制算法对系统信道资源进行了智能动态分配,通过系统仿真证明了该策略能够灵活分配系统时隙资源。     

A novel pitch control system for a wind turbine driven by a variable-speed pump-controlled hydraulic servo system

The paper aims to develop a novel pitch control system for a large wind turbine driven by a variable-speed pump-controlled hydraulic servo system. To perform practical pitch control experiments, a full-scale test rig of the hydraulic pitch control system for a 2 MW wind turbine’s blade, including a novel pitch control mechanism, a variable-speed pump-controlled hydraulic servo system, a disturbance system and a PC-based control system, is designed and set up. The variable-speed pump-controlled hydraulic servo system, containing an AC servo motor, a constant displacement hydraulic piston pump two differential hydraulic cylinders and hydraulic circuits, achieved high response and high energy efficiency, so it is suitable for wind turbine applications. Besides, to implement the pitch control in the proposed novel pitch control system, an adaptive fuzzy controller with self-tuning fuzzy sliding-mode compensation (AFC-STFSMC) is developed to design the pitch controller. Finally, the developed variable-speed pump-controlled hydraulic servo system was built and verified for the path tracking control and path-positioning control of the pitch control of the wind turbines by practical experiments in a full-scale test rig under different path profiles, load torques, and random wind speeds.     

轨道交通专用通信集中告警系统设计

论述了集中告警系统的总体结构,分析了集中告警系统设计中的难点问题。针对系统设计的难点问题详细说明了系统的实现方案:提出了通过前置机进行各种通信协议的接口适配,告警解析服务器进行告警解析,应用服务器进行后台数据处理,客户端编辑监控场景的分层架构,按照分层可扩展理念建设集中告警系统。在轨道交通中得到了很好的应用,证明了系统架构的先进性和可扩展性。     

液压动力转向系统性能分析与优化设计

液压动力转向系统其转向的轻便型和高速行车时的稳定性是一对矛盾,传统的液压动力转向系统无法实现随车速变化而作出必要的精确调节,因此无法兼顾低速时的加力效果和高速时车辆行驶的稳定性,故有必要对传统的机械液压动力转向系统进行优化设计以改善其使用性能。     

Development of rotary hydro-elastic actuator with robust internal-loop-compensator-based torque control and cross-parallel connection spring

Hydraulic actuation systems have high power-to-weight ratio and durability characteristics, but its the non-backdrivability and high output stiffness of hydraulic prevented it from being actively applied to interactive control systems, especially in robotics. This paper describes a force/torque control strategy to address these interactive hydraulic system control problems, with hydro-elastic actuation, which is a combination of a hydraulic actuator with a spring installed on the output side. This configuration simplifies the hydraulic actuator force/torque control problem into a motion control problem. To achieve high performance, first we introduced a robust internal- loop compensator (RIC) for hydraulic motion control, which has equivalent properties to a disturbance observer (DOB) and applicability in non-linear hydraulic actuator dynamics by decoupling the inner-loop compensator and outer-loop controller. This also minimizes sensor requirements and computation costs versus conventional hydraulic motion controllers. Based on this first strategy, second, we propose link-side motion feedback to compensate for undesirable velocity disturbances from the link side to provide high-accuracy torque control for the HEA system. Finally, we propose cross-parallel connection strategy to HEA spring to achieve high durability and deflection linearity Experimental results with custom-designed hardware showed torque controllability, backdrivability, low output impedance, and robustness in linking motion disturbance in time domain zero-torque and stiffness control experiments, without losing much of the high-power potential.     

VCSELs高阶分岔及混沌行为的参数控制

基于自发辐射在微腔激光器中的独特性,利用参数开关调制控制混沌的理论和技术,对VCSELs实施高频大信号深度调制和混沌控制的数值模拟.结果表明,提高自发辐射因子可抑制VCSELs的非线性行为,通过对自发辐射因子的开关调制,可把系统由混沌状态控制到平衡态和nP周期轨道,同时给出了VCSELS各种稳定周期态、分岔数、分岔点位置和混沌带与调控参数之间的定量关系.     

米波超短间距八木天线设计与实现

在密距天线原理、折合振子技术和遗传算法电磁领域的应用研究基础上,利用遗传算法对融合了折合振子与八木天线技术的新型八木天线结构--双折合八木天线进行了多目标优化,找到了一条切实可行的八木天线小型化途径.理论和仿真证明,4单元双折合八木天线单元间距和振子长度都得到了有效减小,同时超短间距天线普遍存在的失配和效率问题得到了解决,获得了较为理想的增益和输入阻抗.     

Force control for hydraulic load simulator using self-tuning grey predictor – fuzzy PID

Hydraulic systems play an important role in modern industry for the reason that hydraulic actuator systems have many advantages over other technologies with electric motors, as they possess high durability and the ability to produce large forces at high speeds. Therefore, the hydraulic actuator has a wide range of application fields such as hydraulic punching, riveting, pressing machines, and molding technology, where controlled forces or pressures with high accuracy and fast response are the most significant demands. Consequently, many hybrid actuator models have been developed for studying how to control forces or pressures with best results.This paper presents a kind of hydraulic load simulator for conducting performance and stability testing related to the force control problem of hydraulic hybrid systems. In the dynamic loading process, perturbation decreases control performance such as stability, frequency response, and loading sensitivity decreasing or bad. In order to improve the control quality of the loading system while eliminating or reducing the disturbance, a grey prediction model combined with a fuzzy PID controller is suggested. Furthermore, fuzzy controllers and a tuning algorithm are used to change the grey step size in order to improve the control quality. The grey prediction compensator can improve the system settle time and overshoot problems. Simulations and experiments on the hydraulic load simulator are carried out to evaluate the effectiveness of the proposed control method when applied to hydraulic systems with various external disturbances encountered in real working conditions.