水下大型接插件密封和分离力测试系统的开发

水下作业设备中常用接插件和水直接接触,所以要密切关注其密封、耐压和分离力等性能。该研究开发了一套水下大型接插件密封和分离力测试系统,该系统包括水压模拟装置、油水混合装置、加载测试系统和水压控制系统。在水压模拟装置中考虑到加载力的平衡和测试过程中油缸伸缩量对水压的影响,特别设计了补偿罩装置。水压控制系统的实现是通过油水混合装置来间接控制水压。通过对被试件在10 MPa 水压情况下分离力测试,所得数据验证了该水压模拟和测试方案的可行性。     

水压人工肌肉水下驱动试验系统设计与试验研究

为了研究水压人工肌肉在水下的性能演化规律和可靠性,设计了水压人工肌肉水下驱动试验系统.根据水压人工肌肉样本型号,分析水压人工肌肉的力位移特性.设计不同收缩量时的水压人工肌肉循环载荷试验结构和弹簧参数.搭建水压人工肌肉水下驱动试验系统,对试验台进行基本功能调试.完成水压人工肌肉在斜坡信号和正弦信号两种工况下的调试,得到了...     

宇通重工推出新型968H型轮胎式装载机

H型系列装载机是宇通重工依靠宇通集团在引入全新的汽车行业设计理念的基础上,应用最新技术和现代设计方法自主开发的高端轮胎式装载机产品,其中,968H型轮胎式装载机是目前H系列产品中的6t高档装载机精品,前不久,该产品接受了来自德国博世力士乐公司总部和力士乐中国有限公司北京调试部共三位调试专家对其液压系统的性能测试,专家们对     

比例溢流阀性能测试系统的研究与开发

设计了能够对比例溢流阀进行性能测试的测试系统,包括液压回路的设计及元件的选型计算,设计并开发了能够控制比例溢流阀的电气控制及PLC程序。对系统进行了安装、调试及实验。实验结果表明,自主开发的比例溢流阀测试系统操作简便,工作可靠,能够达到良好的测试效果,对比例溢流阀的性能测试具有重要的工程实用价值。     

某内场测试设备电路板综合测试系统的设计

根据某发射装置内场测试设备开发需求,基于LabVIEW开发了一种电路板综合测试系统。介绍了系统的总体设计、硬件组成及测试流程。该测试系统对软件实行了模块化设计,具备对多种电路板的自动、手动调试及测试功能,具有人机交互界面友好、自动化程度高、可靠性好,扩展性强的特点。     

基于LabVIEW的电动机软启动器测试系统的实现

电动机软启动器性能参数测试是产品研制、调试、生产的重要环节。研究了采用计算机、数据采集卡等硬件和在LabVIEW虚拟仪器平台上开发的软件构成一套完整的电动机软启动器测试系统。从硬件特别是软件功能方面对测试系统的实现方法及功能进行了详细的介绍。经实际应用表明：该系统具有测试精度高、开发成本低、抗干扰能力强、检测效率高、操作简单等优点。     

0.6m连续式风洞压缩机系统的调试研究

为了考核0.6m连续式风洞压缩机系统的各项性能,也为后续连续式风洞压缩机系统的调试积累经验,对AV90-3轴流压缩机系统进行了调试,包括机械运转试验、临界转速测试、气密性试验、转速控制精度测试、热力性能试验和喘振预防调试。结果表明,调试方法合理可行,机组各项参数满足设计指标要求。     

基于LabVIEW的垃圾压缩实验平台测试系统的设计与实现

根据目前垃圾压缩装置系统测试的状况,提出了基于LabVIEW的虚拟测试实验系统的组建方案.研究开发了城市生活垃圾的压缩特性实验平台及先进的数据采集和处理系统.给出了系统的软、硬件设计过程和系统的调试结果.而且根据实际需要,通过软件可以扩展系统功能,具有使用方便直观,性能稳定、界面友好等优点,能够很好的满足测试需要.     

基于嵌入式脉冲控制方式的电子耳蜗调试平台的体内系统的研发

为了开发电子耳蜗调试平台的体内系统,帮助电子耳蜗佩戴者个体选择最适用的言语编码策略并对其工作参数进行调试,本研究采用数据扩展编码和嵌入式脉冲控制的方式,由单片机采集言语编码序列的数据帧并解码得到刺激参数,控制输出刺激脉冲。刺激脉冲的输出通道和幅度由前一帧的刺激参数决定,脉冲宽度由当前帧的长度控制,实现了调试平台的工作参数对输出刺激脉冲的控制功能。完成了基于嵌入式脉冲控制功能的电子耳蜗调试平台体内系统的设计与调试,通过对调试平台的单电极刺激模式和非实时模式的测试,验证了所设计的调试平台体内系统具有输出连续、稳定的刺激脉冲的功能。     

一种通用自动化测试设备的设计与实现

基于单片机和VC++6.0,设计了一种便于开展产品调试、试验、验收和维修的通用自动化测试设备,详细介绍了总体、硬件和软件设计方法。测试设备采用分布式主从控制系统和模块化设计方法,有效提高了通用性和重用性,缩短了产品的开发周期。     

基于流量控制阀的液体静压导轨动态特性分析

以流量控制阀调节下的闭式液体静压导轨为对象,建立了导轨系统的运动学方程和流量方程,推导并线性化处理了外载荷与油膜厚度、油腔压力的微分方程组,利用Laplace变换获得了传递函数,推导了导轨动态性能的数学表达式。以现场调试为基础,绘制了油膜厚度与动力黏度、油腔压力与初始开口度的关系曲线,分析了系统的幅频、相频特性。分析了动力黏度、初始开口度对时域、频域内导轨动态性能的影响,研究结果可为工程调试提供理论基础。     

钢管静水压试验机在生产中出现的问题与改进

介绍了钢管静水压试验机目前的状况及部分结构功能;并阐述钢管静水压试验机的过去和现在的实际应用。钢管水压试验机系统稳压性能的好坏是衡量钢管水压试验机性能的重要指标。通过分析水压试验机稳压过程中遇到的各种故障及其原因,提出了排除故障的具体措施,将为钢管水压试验机的设计、改造与维修提供了实践依据;同时提出对焊接钢管静水压试验机液压系统和驱动方式进行了技术改进方法。通过该技术的改进,提高了钢管水压试验机的实际应用能力,满足了机组生产范围内的钢管水压试验的要求。     

通用滑动轴承CAT系统的研制

本系统属于应用于型滑动轴承ＣＡＴ系统，它可以对各种动压，静压轴承行进不同状态下的性能测试，具有多通道快速巡回采样，数据处理，图形显示等功能。能实现对油膜压力，油膜厚度及油膜温度的测试。本试验台同时可以对轴承的动态特性进行测试。     

Buckling analysis of filament-wound thick composite cylinder under hydrostatic pressure

Underwater vehicles that operate in deep waters require a pressure hull to maintain the sufficient strength and stiffness against external hydrostatic pressure. We investigated the validity of the finite element method (FEM) that is applied to a buckling analysis of the filament-wound composite cylinder, subjected to an external hydrostatic pressure. Two methods were suggested for the buckling analysis of a filament-wound thick composite cylinder under hydrostatic pressure: using the equivalent properties of the composite, and using stacking sequence. The hydrostatic pressure test was conducted to verify the FEA. Test results were compared with the previous results obtained by FEM on the buckling of a filament-wound composite cylinder under hydrostatic pressure. FEM analysis results were in good agreement with the test results. The difference between FEM results and the test results was approximately 1∼5%.     

The Behavior of the Centrally Pivoted Thrust Bearing Pad with Hydrostatic Recesses Pressurized by a Constant-Rate Flow

The tilting behavior of the centrally pivoted, externally pressurized tilting thrust pad is investigated. The pressure distribution in the oil film is obtained by solving the Reynolds' equation which takes into account the external pressurization induced by a constant-rate flow. The relation between the size of the hydrostatic recess and the tilt angle of the pad is described. Calculations show that a pad with pressure recesses may have a negative tilt angle, depending on the size of the recess. The pressure variation around the hydrostatic pressure recess causes the moment to force the pad to tilt backward. At high shaft rotational speeds, the pad tilts backward too much and eventually fails to support the load. The hydrostatic pressure recess that is utilized to avoid the metal contact may cause this. The result was confirmed by experiments.     

稀有金属管材水压试验机控制系统研制

水压试验机是稀有金属管材质量与性能检验的重要设备,其测试压力精确度和稳定性是系统关键。针对管材水压试验过程系统测试基准压力难以快速准确地达到工艺设定值的特点,提出了测试基准压力控制的灰色预测PID控制算法,研制了基于工控机+PLC的管材水压试验机控制系统。生产应用表明该系统对稀有金属管材质量与性能测试检验有很大的改善,具有典型的应用价值。     

基于高压油管外卡油压信号的柴油机实时转速测量方法研究

柴油机高压油管油压波形中包含了大量可作为供油系统故障诊断的特征参数和转速变化的信息,本文介绍了利用柴油机高压油管油压波形信号提取柴油机转速这一重要参数的方法,建立外卡油压信号采集系统,运用巴特沃斯低通滤波器对测量的高压油泵油压信号进行二次处理,对提取的转速进行平均,实验表明,这种检测方法有技、可行.     

Modeling and simulation of hydrostatic transmission system with energy regeneration using hydraulic accumulator

A new hydraulic closed-loop hydrostatic transmission (HST) energy-saving system is proposed in this paper. The system improves the efficiency of the primary power source. Furthermore, the system is energy regenerative, highly efficient even under partial load conditions. It can work in either a flow or pressure coupling configuration, allowing it to avoid the disadvantages of each configuration. A hydraulic accumulator, the key component of the energy regenerative modality, can be decoupled from or coupled to the HST circuit to improve the efficiency of the system in low-speed, high-torque situations. The accumulator is used in a novel way to recover the kinetic energy without reversion of fluid flow. Both variable displacement hydraulic pump /motors are used when the system operates in the flow coupling configuration so as to enable it to meet the difficult requirements of some industrial and mobile applications. Modeling and a simulation were undertaken with regard to testing the primary energy sources in the two configurations and recovering the energy potential of the system. The results indicated that the low efficiency of traditional HSTs under partial load conditions can be improved by utilizing the pressure coupling configuration. The round-trip efficiency of the system in the energy recovery testing varied from 32% to 66% when the losses of the load were taken into account.     

一种精密水压试压装置的设计和应用

介绍了一种精密水压试压装置.压力试验所用的压力釜能够自动快速开闭,密封采用自紧式密封结构.精密水压试压系统向压力釜打压时,通过稳压、缓冲、减振的作用,使升压平稳,保压精确,压力釜内的被试件不会因为压力波动太大而失稳.该装置能够完成对试压工艺曲线有严格要求的产品外压试压.     

A new reference method for testing hydrometers

The two methods for determining the density or specific gravity of liquids used in testing hydrometers are: (1) comparison with standard reference hydrometers, and (2) hydrostatic weighing. In this paper, a new method for the determination of the density of liquids for the testing of hydrometers is described. The method involves determining the differential pressure between two points or planes separated vertically in a liquid and dividing the differential pressure by the product of the local acceleration due to gravity and the vertical separation. The system is based on sound scientific principle, is easy to use, is very precise, and is easily and accurately calibrated using water. The results for such a system are demonstrated for water and for nitric acid solutions. The precision is shown to be approximately 1 part in 10 000 or 0.01%, which is ideal for the testing of hydrometers the precision of which is about 1 part in 1 000 or 0.1%.