TPMS发射器三防设计研究

TPMS发射器的三防设计是TPMS产品设计的重要组成部分.针对三防设计不到位引发的问题,提出了电路板的表面涂覆、传感器气孔的周边密封、电讯组件的灌封,以及气门嘴组件表面处理的三防设计思路.应用上述三防技术,可大大提高TPMS发射器的三防能力.     

一种有源微波组件制造工艺技术研究

分析了一种有源微波组件盒体与传输信号微带板的连接方法,研究了微波组件实现电讯功能的关键制造工艺技术,有效解决了微波组件在生产制造中技术难题,提高了产品质量。     

某高机动雷达天线结构机电结合优化设计

天线设计包括电讯设计和结构设计,在两种设计都要求最优时,便产生矛盾.随着对雷达天线机动性要求的不断提高,这种矛盾愈发突出.针对某高机动雷达天线,论述了如何使用有限元分析软件(ANSYS)进行机电结合优化设计,以及介绍了与电讯设计进行交互优化的方法.这些方法有效地解决了高机动既要结构灵活轻巧又要满足电讯高指标性能两者间的矛盾,实现该雷达既要高精度又要高机动的设计要求.     

某车载毫米波雷达组件热设计与参数优化

为实现毫米波雷达组件高效可靠的散热,根据前端电讯热控需求,文中提出均温板–翅片一体化风冷热控结构设计方案,并采用仿真设计软件对热设计方案进行了分析和仿真优化。研究结果显示：组件各芯片温度均在安全温度以下,发射芯片的最高结温（最高温度）为141.1?C,与传统风冷散热器相比,采用新型风冷散热器可使芯片最高温度降低9.8?C,强化散热效果明显。此外,也对风冷散热器结构参数和界面接触热阻进行了分析,确定均温板翅片高度30 mm、翅片间距3 mm为该热设计的优选方案。该研究结果可供高效风冷散热和毫米波组件热设计工程应用参考。     

基于虚拟维修的复杂产品维修性设计研究

为提高产品的维修性设计,提出了基于虚拟维修的复杂产品维修性设计方法。定义了维修功能组件,结合维修性顶层设计要求对各功能组件进行维修性设计要求分配,提出各功能组件的初步维修性设计方案;结合虚拟维修仿真结果对维修性设计进行验证,并提出改进意见和措施,最后优化各功能组件的维修性设计方案,提高整个产品的维修性设计水平。     

基于SoPC的PWM组件设计

采用SoPC技术,以Altera公司的DE2-70开发板为硬件平台,依据组件的定制方法,设计了PWM组件的定制,经过仿真和实验验证,该组件符合设计要求,可以作为通用的组件使用。     

微波毫米波T/R组件内键合引线熔断机理研究

键合引线的耐电流水平是影响键合可靠性的重要因素之一,直接决定了雷达微波毫米波T/R组件的使用寿命。文中结合雷达微波组件的实际应用需求,开展键合引线耐电流水平研究,并深入分析了引线熔断机理,探讨引线熔断的微观过程,为电讯设计提供数据和理论参考。研究发现,键合引线熔断过程是焦耳热作用下的原子热迁移过程。熔断电流水平受外部气氛影响,大气气氛下的熔断电流水平略高于真空气氛下,可为航天产品设计提供参考。     

某米波雷达数字阵列模块结构设计

设计了某雷达收发数字阵列模块(DAM)的结构.在满足电讯要求的条件下,首先合理布局各模块减小体积,然后对DAM进行减重设计和电磁兼容性设计.     

大口径反射镜组件设计及稳定性研究

针对惯性约束聚变(ICF)装置中使用数量较多的大口径反射镜组件结构,在满足物理功能要求的前提下,根据其稳定性及定位、安装、调整和变形等要求,运用运动学原理及模块化设计思想,设计了一个典型的反射镜组件结构,并对组件结构进行了力学分析及实验.计算和实验结果表明,该组件满足稳定性要求,其定位和重复定位精度＜10 μrad,安装调整方便可靠,满足设计要求.     

对JB—250ml／r径向柱塞泵柱塞组件技术关键的探讨

JB系列径向柱塞泵的核心组件之一-柱塞组件,牵连因素多。精度要求高,设计考虑面广,该组件的设计成功与否,关系着整个泵的设计成败,本文探讨了新型JB-250HSPQF-K型径向柱塞泵柱塞组件设计、制造中可能出现的问题和解决对策。     

汽车连接器端子正向力分析

汽车连接器端子是决定连接器电力和信号传输性能的关键零件,端子的正向力是决定端子性能的一个重要因素。分析端子正向力对连接器机械性能、电性能及磨损寿命的影响,找出影响端子正向力的主要因素,提出端子正向力的设计思路。     

Robust integral of neural network and precision motion control of electrical–optical gyro-stabilized platform with unknown input dead-zones

Parametric uncertainty associated with unmodeled disturbance always exist in physical electrical–optical gyro-stabilized platform systems, and poses great challenges to the controller design. Moreover, the existence of actuator deadzone nonlinearity makes the situation more complicated. By constructing a smooth dead-zone inverse, the control law consisting of the robust integral of a neural network (NN) output plus sign of the tracking error feedback is proposed, in which adaptive law is synthesized to handle parametric uncertainty and RISE robust term to attenuate unmodeled disturbance. In order to reduce the measure noise, a desired compensation method is utilized in controller design, in which the model compensation term depends on the reference signal only. By mainly activating an auxiliary robust control component for pulling back the transient escaped from the neural active region, a multi-switching robust neuro adaptive controller in the neural approximation domain, which can achieve globally uniformly ultimately bounded (GUUB) tracking stability of servo systems recently. An asymptotic tracking performance in the presence of unknown dead-zone, parametric uncertainties and various disturbances, which is vital for high accuracy tracking, is achieved by the proposed robust adaptive backstepping controller. Extensively comparative experimental results are obtained to verify the effectiveness of the proposed control strategy.     

热成型技术在提高汽车偏置碰性能中的应用

为了提高某车型的偏置碰性能,采用LS-DYNA分析软件,对该车型偏置碰性能进行仿真优化。在保证周边车身零件的搭接关系不变的前提下,在前纵梁Kickdown区域使用热成型板。结果显示:前隔板侵入量减小,保证了车内乘员在偏置碰中的生存空间,提高了车身偏置碰安全性能。     

基于ANSYS的制动盘模态分析

制动盘作为盘式制动器的关键部件,在制动过程中发生的振动对其工作性能有较大的影响,为了准确把握其振动性能特性,采用有限元方法建立制动盘部件有限元模型,并对其进行自由模态分析和约束模态分析,研究得到了制动盘前六阶固有频率和振型,并确定了制动盘的薄弱模态,研究结果为制动盘的选材和设计提供了一定的理论参考。     

The effect of runner blade loading on the performance and internal flow of a Francis hydro turbine model

As a core component of a hydropower station, hydro turbines play a vital role in the integration of a power station. Research on the technology of hydro turbine is continuously increasing with the development of water electricity. It is effective and successful to design a Francis turbine runner blade with good performance by one-dimensional hydraulic design method. For the one-dimensional hydraulic design, the runner blade angle at leading and trailing edges can be defined by calculation of Euler’s head. Design of the runner blade profile at several cross sections is needed to design a runner shape. In this study, there are three different blade loadings conducted to compare the internal flow characteristics and performance. The result shows that the front loading achieves the best efficiency in comparison to other loadings, which is good at suppressing the loss at draft tube.     

新型无堵塞自吸污水泵的设计

针对ZW系列自吸排污泵存在易堵塞叶片和耐磨板不易更换的问题,进行了改进设计。简述了新型无堵塞自吸污水泵的特点和设计思想,分析了该泵的结构特点,提出了该泵的水力设计和结构设计方法,并研究了前置供水通道仓、转子部件以及回流孔对自吸污水泵的影响。最后,设计试制了新型无堵塞自吸污水泵的样机,并对其进行了试验。研究结果表明,新型自吸排污泵具有无堵塞性能好、自吸时间短、耐磨性强、可靠性高、使用维修方便等特点,泵的性能曲线符合设计要求,达到了预期设计目标,为今后相关工作提供了有益的参考。     

Non-sample based parameters design for system performance reliability improvement

Design methods for quality generally help to improve quality over time, but do not consider change of system performance over time, resulting from degradation in components. As design methods for quality over time (performance reliability), which minimizes effects of unavoidable component degradations as well as component variations on system performance change, system model-based sampling methods using Monte-Carlo simulations have been used. But, there are main concerns related to computational efficiency and optimization in applying the sampling methods. To overcome the concerns, we propose a non-sample method for quality over time. Based on the proposed method, the process of allocating design parameters, which could minimize the noise effects with the consequence that both quality and performance reliability are optimized, is discussed. Reliability metrics such as mean time to failure and standard deviation of time to failure are optimized simultaneously for reliability improvement. Desirability functions for the metrics are introduced to perform the simultaneous optimization. The proposed method is applied to an electrical system design and compared to a sampling based design method.     

浅谈发动机配气机构优化改进设计

配气机构是发动机重要的组成,配气机构功能要按照发动机各气缸工作循环与发火次序要求对进、排气门进行定时开启与关闭。发动机动力和经济的性能是不是具有优越性和可靠性,将噪声和振动控制到较低限度内,这都与配气机构的设计有着直接的关系。配气机构要具备良好换气性能和良好运动学、动力学的性能,保持平稳工作和低振动,小噪声。本文通过对配气机构的研究与优化改进设计,将理论与实际应用结合,为发动机配气机构的设计积累经验。     

基于ANSYS的轮式装载机前车架结构分析与研究

前车架是装载机的基础部件之一,前车架设计水平的高低直接影响到整机产品性能和市场竞争力。利用ANSYS软件对轮式装载机的前车架进行结构分析和研究,根据前车架应力分布的特点进行结构改进并进行验证分析,为装载机前车架的设计提供理论依据。     

电动轿车前端盖弹性套筒夹头车夹具设计

本文分析了电动轿车前端盖弹性夹头车夹具的工作原理和夹具设计方案,对零件加工工艺性进行了探讨。