某速度锁定器结构设计与试验

速度锁定器作为一种能量传递装置,它不同于液体粘滞阻尼器,不能耗散能量;但也有普通耗能阻尼器一样的功能,在温度、徐变等慢速作用下可以自由运动。但当速度超过其控制值时,液体速度锁定装置能迅速、有效地激活质量块间的连接,像刚性连杆一样工作;事件结束后,它又能恢复到初始作用力输出状态。基于某型速度锁定器,阐述了其基本工作原理,对缸体、活塞杆等主要结构部件进行了强度核算,并开展了不同温度下慢速、快速、模拟动力相关性能试验。结果表明:该速度锁定器结构形式合理,强度达到设计要求,具有较好的锁定功能。文中所采用的设计与试验方法正确,可行性高,通用性好,对于同类产品有指导意义。     

980nm半导体激光器双布拉格光纤光栅波长锁定器

提出了优化由两个均匀布拉格光纤光栅组成的980nm半导体激光器波长锁定器的方法以满足光纤放大器对半导体激光器的性能要求。运用耦合模理论推导了双布拉格光纤光栅(FBG)的透射率和反射率的解析表达式和波长锁定器增益方程。研究了两光栅之间的距离、光栅到激光器前端面的距离、光栅折射率、光栅折射率周期、光栅栅长和温度对激光器增益曲线的影响,并通过优化这些参数来达到最佳的锁模性能。测量了带双FBG波长锁定器的非致冷半导体激光器的输出光谱和出纤功率。实验结果表明:高功率非致冷980nm半导体激光器在0～70℃时的波长漂移为0.5nm,边模抑制比达45dB以上,半峰值全宽度1nm。经优化设计的980nm半导体激光器FBG波长锁定器可满足光纤放大器对非致冷半导体激光器大功率、长寿命、高可靠性、小尺寸等性能的要求。     

一种军用LRM模块的新型插拔装置

为了解决LRM模块尤其是液冷LRM模块在安装箱内快速安装和拆卸、满足日益苛刻的短时维护雷达的需求,实现雷达外场二级维护要求,设计了一种军用LRM模块新型插拔装置。插拔装置由两部分组成：锁紧机构和锁定器。锁紧机构安装在LRM模块的前面板上,锁定器安装在模块安装箱上,通过两者之间的压接和分离实现LRM模块在安装箱上的快速安装和拆卸。     

和谐大功率交流机车速度传感器自动检定装置的研究

为了满足和谐大功率机车速度传感器检修的需求,设计速度传感器自动检定装置。该检定装置由转速源（变频器、电机、机械过渡连接）、光电编码器、开关电源、信号调理电路、模拟量检测板卡、脉冲量检测板卡及工控机等组成,采用自动控制方式检测速度传感器的速度和波形参数。对HXD3机车速度传感器进行测试,测试结果显示：试验装置性能稳定,操作简单,具有良好的通用性和扩展性。     

小型化弹丸速度测试系统

提出了一种基于光幕测速和单片机数据处理的小型化的弹丸速度测试系统。采用半导体激光器、光电探测器、原向反射屏形成大面积光幕测试区,当弹丸穿越光幕时,光通量的变化被光电探测器转变为电信号,经过比较电路后送入单片机进行数据处理,并由LED进行速度显示。文中对测试原理和测试系统的光学设计单元、信号处理单元及数据采集、显示单元进行了介绍,并对该系统进行了壬7．62mm弹丸速度测试,给出了测试数据。试验表明,该测速系统具有灵敏度高、体积小、成本低、使用方便、灵活、工作可靠等优点。     

一种低频水平振动激励系统的设计与试验

设计了一种使用方便、结构简单并具有1.2米行程的低频激振测试系统.该系统能够通过伺服控制模拟正弦速度曲线、半正弦速度曲线、梯形速度曲线、阶跃等运动形式,可在一定的频率范围内实现扫频.该系统的长行程可以弥补普通电磁激振台的低频运动失真的小足.样机测试显示,系统在较高速度下运动,可以得到较为理想的运动曲线,随着速度的降低,...     

岸边集装箱起重机能耗测试与分析

针对岸边集装箱起重机的能耗问题,选取ZP型65 t岸边集装箱起重机作为测试样机,选用电能质量分析仪作为测试仪器,通过两瓦计法对岸边集装箱起重机的能耗进行系列测试,并基于所得测试数据分析了起重量、升降高度、升降速度、小车移动速度、小车移动距离等主要参数对能耗的影响,可为进一步的节能降耗工作提供参考和依据。     

间接测量舵机输出端速度方法研究

提出一种基于Windows时间与位移传感器间接测量舵机输出端速度的方法,设计出Windows时间与位移传感器间接测量舵机输出端速度的总体方案,对测试系统硬件选择、软件设计等方面进行探讨.试验证明该测试系统具有精度高、误差小和自动化程度高等特点,具有良好的推广价值.     

高压断路器激光测速传感器的设计

高压断路器速度特性测试一直被视为行业难题,随着断路器本体的体积缩小,接触式传感器安装空间也越来越小,导致测试困难,且存在磕碰本体的风险。鉴于此,设计了一种非接触式激光测速传感器,安装简易且安全性极高。传感器样机在110 kV高压断路器上进行了验证测试,可快速、稳定、准确地得到刚分速度、刚合速度、平均速度等数据,极大地提升了试验效率。     

硬件在环台架制动性能精度影响研究

制动性能是车辆核心功能之一,硬件在环台架(HIL)可以更好地支持车辆的快速开发及智能驾驶功能测试,而基于HIL台架开发需要确保台架的测试结果与实车测试一致性。通过将制动过程逐层分解,对制动执行机构、制动器、轮胎等影响测试精度的模型进行优化,明确关键因子,并从制动响应趋势、减速度和制动距离等多个维度对实车与台架测试的数据进行客观比较分析。对标结果表明:优化后的模型在制动响应趋势、减速度、制动距离等方面与实车具有较好的一致性。     

A New Grasping Mode Based on a Sucked-type Underactuated Hand

Robot hands have been developing during the last few decades. There are many mechanical structures and analyti?cal methods for di erent hands. But many tough problems still limit robot hands to apply in homelike environment. The ability of grasping objects covering a large range of sizes and various shapes is fundamental for a home service robot to serve people better. In this paper, a new grasping mode based on a novel sucked?type underactuated(STU) hand is proposed. By combining the flexibility of soft material and the e ect of suction cups, the STU hand can grasp objects with a wide range of sizes, shapes and materials. Moreover, the new grasping mode is suitable for some situations where the force closure is failure. In this paper, we deduce the e ective range of sizes of objects which our hand using the new grasping mode can grasp. Thanks to the new grasping mode, the ratio of grasping size between the biggest object and the smallest is beyond 40, which makes it possible for our robot hand to grasp diverse objects in our daily life. For example, the STU hand can grasp a soccer(220 mm diameter, 420 g) and a fountain pen(9 mm diameter, 9 g). What's more, we use the rigid body equilibrium conditions to analysis the force condition. Experiment evaluates the high load capacity, stability of the new grasping mode and displays the versatility of the STU hand. The STU hand has a wide range of applications especially in unstructured environment.     

结构静力/疲劳试验控制模式转换技术研究

根据飞机结构静力/疲劳试验中起落架试验、试验支持、操纵系统试验、破坏试验的需求,对模式转换技术进行了研究,并利用FlexTest 200协调加载控制系统进行了模式转换验证试验。试验结果表明,模式转换技术可以应用于飞机结构静力/疲劳试验。     

Scoring tests of aircraft transmission lubricants at high speeds and high tem peratures

Aircraft engines contain gears that have to be lubricated under conditions of high speeds and extremely high temperatures, In this field of application scoring damage can occur. In Europe and partly also in the USA the scoring load capacity of gear oils is expressed in terms of FZG Scoring Load Stage; the FZG Gear Test Rig is described. The normal test procedure A/8.3/90 as standardised in DIN 51 354 using A-type gears at a pitch line velocity of v = 8.3 m/s and a starting oil temperature of 90°C is presented. A modified procedure at double speed and increased oil temperature A/16.6/140 is discussed. The scoring load capacity of aircraft transmission lubricants is expressed worldwide in Ryder Gear Test results. Because of the high costs and problems with the availability of test gears a modified FZG Ryder Test was developed. The method is presented and comparative results of typical aircraft engine oils in the FZG, the FZG-Ryder and the original Ryder Gear Test are shown. From this experience it becomes obvious that alternative test methods for the evaluation of scoring load capacity of aircraft transmission lubricants can be available in the near future.     

BOMCO煤层气钻机专用电直驱顶驱装置设计

为满足电动煤层气钻机自主配套的需要,在吸收国内外先进顶部驱动钻井装置（简称顶驱装置）设计经验的基础上,研制了BOMCO煤层气钻机专用电直驱顶驱。介绍了该顶驱装置的结构方案、技术参数等情况。重点介绍了电机直驱技术、浮动缓冲短节、前开口浮动背钳等结构特点。     

Formulating advanced 4 centistoke gas turbine oils - a feasibility study

A formulation study has been carried out to assess the feasibility of developing advanced gas turbine lubricants in the (4 cSt) viscosity range intermediate between current MIL-L-7808 and MIL-L-23699 lubricants. Using additive technology developed on advanced MIL-L-2 7502 oils the authors have formulated several 4 cSt polyol ester base stocks. Eight of the blends thus far tested have shown good to acceptable performance in the Erdco Bearing Rig Test run under MIL-L-27502 conditions. Various other key targets of a proposed new specification have been met or closely approached.     

Experimental measurement of strain and stress state at the contacting helical gear pairs

Contact stress evaluation in gears has been a complex area of research, due to its non-linear and non-uniform nature of stress distribution. The high contact stress on gears results in pitting and scuffing, which leads to tooth failure. Furthermore the effects of friction on gear contacts make the problem more complicated. Hence, in this paper, attempt has been made to study contact stress in gears. The experimental testing and analysis of the helical gear was carried out using Gear Dynamic Stress Test Rig (GDSTR). GDSTR is a newly designed test rig to compute the contact stresses on the gear pair contact, under real gear conditions. GDSTR uses the strain gauge and carbon slip rings to measure the surface contact stresses at the contacting points of a meshed gears. The experimental analysis showed promising results which have been verified by the finite element frictional contact analysis. The experimental testing was carried out on 5° and 25° helical gear pairs. Helical gear models with the same specifications and for different frictional coefficient conditions were also generated using FE modelling. The frictional contact stress analysis using FEM has been used for comparison with the experimental results.     

Anti-shudder durability of automatic transmission fluids: Mechanism of the loss of shudder control

Field samples of automatic transmission fluid (ATF) from vehicles fitted with controlled-slip torque converter clutches have been analysed to determine the cause of the onset of vehicle shudder. A laboratory anti-shudder test has been developed using the SAE No. 2 machine. This test includes several degradation mechanisms: thermal degradation in engaging clutches, oxidative degradation in the presence of catalytic metals, and degradation produced by a continuously sliding clutch. At least in the case of one specific fluid, the mode of failure produced in the laboratory test was very similar to the mode of failure in the vehicle. Fluids with improved anti-shudder durability have been evaluated by this test method and fail by different mechanisms. Test matrices have been conducted to separate the contribution of fluid and hardware to the loss of shudder control in these systems.     

低沸点燃料二甲醚润滑性评估实验台的研制

二甲醚在常温常压下为气态,不能用传统方法评估其润滑性能。根据低沸点燃油的物理特性和高频往复机(HFRR)的基本原理,设计可加压的高频往复机,初步搭建用于低沸点燃油的摩擦磨损试验台架,并采用常规燃油进行油品的可分辨性试验。结果表明,该台架可以用于评价不同油品的润滑性,为二甲醚等低沸点燃油润滑性能评估方法的建立奠定了基础。     

旋挖钻机多余流量阀异响仿真分析

经市场反馈,旋挖钻机上所装多余流量阀发生异响,特别是在低档位工作时,多余流量阀发出高频振动响声,本文结合系统原理,利用AMESim软件对系统建立了局部模型,并仿真,从原理上解释了异响的原因,并给出改进措施,试验证明分析的结论是正确的,改进措施是可行的。     

ZJ70DB钻机液压套管扶正台的设计与改进

重点介绍了液压套管扶正台的设计技术方案、结构型式、性能特点、主要技术参数等。与常规套管扶正台相比,该套管扶正台采用了液压提升方式及配套的液压控制系统,使操作台垂直升降时灵型,目前已经投产,其零部件的设计具有通用性,可广泛配套于陆地、海洋钻机各种型活自如,并配备翻转装置及断绳保险装置,操作简便、可靠。经过多次改进后已完成了定式的井架上。