一种仿人手软体康复机器人结构设计与实验

文章针对手部康复训练提出一种偏心波纹管软体致动器结构,研制出一款具有镜像疗法功能的手部康复软体机器人.设计该偏心波纹管软体致动器结构的波峰、波谷中心存在一定的偏心距,以减少其在变形过程中的能量损耗,提高与人手的适配性;基于镜像疗法进行手部康复软体机器人控制系统的设计,使该系统具有主动康复训练、被动康复训练和镜像康复训练3种工作模式.抓取实验、指尖输出力测试以及镜像训练实验的结果表明,所设计的手部康复机器人具有较好的稳定性和顺应性,能够满足手部功能障碍患者的康复训练需求.     

基于集中模式的铁路自动售票系统设计与实现

铁路自动售票系统作为一项目前中国铁路的综合性新兴技术,现已广泛应用于中国高铁客服体系。针对现有的分散管理模式下铁路自动售票系统存在的如服务器资源利用率和稳定性低、维护工作量大等问题,提出一种基于集中模式的铁路自动售票系统设计方案。采用负载均衡器对客票系统业务数据进行分流,通过在沪宁和沪杭高速铁路客运专线的成功试用,证明该设计方案能够提高系统可靠性,减少运行维护工作量并极大降低运营成本。     

基于离散元法的粗糙表面摩擦过程数值模拟

文章利用离散单元法对粗糙表面接触与摩擦过程进行了建模和模拟,再现了表面摩擦时表面形貌变形的整个过程.研究结果表明:影响表面形貌的主要因素是压力和速度,速度主要影响表面切向应力,压力主要影响法向应力;同时,表面形貌的变形量主要与压力和速度有关,速度和压力越大,表面形貌变形越严重.     

句重音与句末语气词的时长和能量

实验分析了重音位于句首、句中和句末三种情况下句末语气词时长和能量的变化情况。分析结果表明,句重音能够对句末语气词的时长和能量产生比较大的影响。重音位于句首和句中时语气词时长短、能量小;重音位于句末时,语气词时长长、能量大。     

雄番鸭与雌麻鸭人工授精的研究

本文报导雄番鸭与雌麻鸭人工授精的研究.实验证明: 以台鸭诱情, 用手指按摩雄鸭泄殖腔口,刺激其翻出阴茎,用搪瓷杯承接射出的精液,经稀释液稀释后,用特制的输精器,辅以食指定位法授精。这种授精方法简便准确,适于养鸭专业户的推广使用。番鸭精子在麻鸭输卵管中存活1～3天时,卵子受精能力较强,受精率为57～63％。从第四天开始下降到44％左右。实验表明,为维持较高的受精率,每三天输精一次较为合适。在雄鸭不足的情况下,亦可四天输精一次,受精率仍能维持在58％左右。通过人工授精,一只雄番鸭每日采精一次能够配种8～15只母麻鸭(可间隔3～4天授精一次)。而人工辅助配种,一只雄番鸭每日只能配一只雌麻鸭(一般间隔5日重行交配)。两者相比较,人工授精效果比人工辅助交配高5～9倍,不但节省配种的雄番鸭数目,而且缩短配种操作时间,有很高的经济效益。     

不同抗性玉米接种矮花叶病毒后的生理生化变化研究

选取对玉米矮花叶病毒的抗感病品种沈137和Mo17,以未接种植株为对照,接种矮花叶病毒后,对144h内叶片中的可溶性糖、丙二醛和过氧化氢含量及防御反应酶系中的过氧化氢酶（CAT）、过氧化物酶（POD）、超氧化物歧化酶（SOD）和苯丙氨酸解氨酶（PAL）活性变化进行了研究.试验结果显示,接病后抗病品种的可溶性糖含量变化不大或有上升而感病品种则下降;丙二醛含量在抗感玉米中均变化不大;抗病玉米中H2O2含量下降,而感病玉米中无太大变化.接病后的玉米叶片中4种酶活性的变化表现为抗病品种的CAT活性呈现出先降低后升高,感病品种变化不大;抗病品种的POD活性高于对照,感病品种则以下降为主;SOD活性在感病玉米中呈升高,抗病品种中变化不大;PAL酶活的变化是抗病品种表现为先升高随后下降,而感病玉米则相反.用干燥和冷冻保存后的病叶接病,玉米的发病情况是冷冻保存的叶片比干燥保存的叶片发病率高.     

Non-Fourier Heat Conduction Effects During High-Energy Beam Metalworking

Non-Fourier heat conduction induced by ultrafast heating of metals with a high-energy density beam was analyzed. The non-Fourier effects during high heat flux heating were illustrated by comparing the transient temperature response to different heat flux and material relaxation times. Based on the hyperbolic heat conduction equation for the non-Fourier heat conduction law, the equation was solved using a hybridmethod co mbining an analytical solution and numerical inversion of the Laplace transforms for a semiinfinite body with the heat flux boundary. Analysis of the temperature response and distribution led to a criterion for the applicability of the non-Fourier heat conduction law. The results show that at a relatively large heat flux, such as greater than 108 W/cm2, the heat-affected zone in the metal material experiences a strong thermal shock as the non-Fourier effects cause a large step increase in the surface temperature. The results provide a method for analyzing transient heat conduction problems using a high-energy density beam, such as electron beam deep penetration welding.     

混凝-ABR-活性污泥法组合工艺处理印染废水

通过工程实例,介绍混凝—ABR—活性污泥法组合工艺处理印染废水的效果及主要设计参数．运行结果表明CODCr、BOD5及色度的去除率分别达90％、93.4％和97．4％,最终出水水质达到《广州市污水排放标准》(DB4437—90)新改扩一级排放标准,与设计参数相符合,该组合工艺在印染废水处理中具有实用性。     

基于有限元法和边界元法的轻量化车身声学分析

应用计算机辅助工程分析技术对一更换材料和板厚的轻量化七座客车进行声学分析.在计算声压响应时,应用有限元法进行了车身结构的频率响应分析,将计算所得的结构壁板速度响应作为内部声腔的边界条件,采用边界元法计算乘员室内部的声响应.由于整车结构优化的复杂性和汽车轻量化的要求,只对高出原结构声压响应的声压峰值进行了壁板贡献度分析,确定了贡献度最大的板,使后续的结构优化更有针对性.     

Virtual Prototype Simulation and Reliability Analysis for Drive System of Armored Chassis

Drive system is the key device of armored chassis. Its working state and reliability influence the maneuver performance of armored chassis directly. In order to simulate the failure process and evaluate the service reliability of drive system in training or battle missions,a new kind of dynamic simulation model and driving simulation platform of the complete drive system were established based on virtual prototype and finite element technology in this paper. Using the platform, the kinematics and dynamic characteristics of drive system were studied and analyzed in detail,the dynamic load spectrum of key components was obtained,the service life was predicted, and the service reliability evaluation results were provided. A simulation example of transmission gear was shown to illustrate the simulation and evaluation process. The result proves that the simulation method not only can be used to compute and evaluate the service reliability of complex mechanical mechanism, but also has high precision and reasonable computational cost. Therefore,simulation and reliability analysis based on virtual prototype of the armored chassis drive system will provide scientific reference for the formulation of armored chassis reasonable repair cycle.