测量扭矩的新型电子装置

为测量传输扭矩,一个采用数字技术新的扭矩计已经应用。只要扭力棒从传输扭矩得来的力变换成脉冲数,扭矩的数字指示就能实现。因这扭矩计在测定旋转扭力棒的扭转时没有任何象汇流环那样的触点,所以特别精确和适宜在高速发动机中使用。该仪器已经成功地用来测量燃气轮机转速为20000转/分时的扭矩。     

用盖挖逆筑法修建布鲁塞尔地铁米蒂（Midi）车站的设计与施工

采用盖挖逆筑法修建的布鲁塞尔地铁米蒂（Ｍｉｄｉ）车站具有以下特点，该车站的地面上有走行列车的高架桥，车站顶板采用预应力混凝土梁组成，采用先冻结土壤，后构筑连续墙的方法作围护结构；在封底以前设临时支撑梁，为抗浮力以达到整个结构的垂直平衡而采用厚２．８ｍ的钢筋混凝土底板（只在上部布筋）。     

在稳态进气流情况下用激光测速法测定柴油机气缸内的三维速度

在用于两种不同柴油机气缸盖的稳态气流装置中,用激光测速法测定了气缸内空气动力学的三维速度。 当速度变化相对恒定时,发现平均速度梯度大的复杂回流。 两个分矢量依次相加,可以对不同的气缸盖的气流特性加以迅速对比,同时可以和早先的热线风速仪及叶片风速仪测定法作比较。发现定向气道气缸盖产生两个主要的涡旋体,而铸造螺旋气道产生的气流近似于简单的刚体转动。     

嵌入拉格朗日元法估算某些水下装置吸收波浪能研究(英文)

A simple approach is described to estimate the wave power absorption potential of submerged devices known to cause wave focusing and flow enhancement.In particular,the presence of a flow-through power take-off(PTO)system,such as low-head turbines,can be accounted for.The wave radiation characteristics of an appropriately selected Lagrangian element(LE)in the fluid domain are first determined.In the limit of a vanishing mass,the LE reduces to a patch of distributed normal dipoles.The hydrodynamic coefficients of this virtual object are then input in a standard equation of motion where the effect of the PTO can be represented,for example,as a dashpot damping term.The process is illustrated for a class of devices recently proposed by Carter and Ertekin(2011),although in a simplified form.Favorable wave power absorption is shown for large ratios of the LE wave radiation coefficient over the LE added mass coefficient.Under optimal conditions,the relative flow reduction from the PTO theoretically lies between 0.50 and 1 2≈0.71,with lower values corresponding to better configurations.Wave power capture widths,the sensitivity of results to PTO damping and sample spectral calculations at a typical site in Hawaiian waters are proposed to further illustrate the versatility of the method.     

基于 S9S12HA32的汽车组合仪表设计

针对汽车上电控技术越来越复杂、通信量大等状况,基于S9S12HA32主控芯片设计一款组合仪表系统,利用CAN总线特性进行数据传送,通过步进电机对指针进行精确控制,结合主控芯片的结构特点及功用设计了组合仪表的硬件电路连接,设计了控制软件的具体实施方案。试验结果表明,基于S9S12HA32单片机设计的组合仪表稳定性好、精度高、反应快速,满足了用户对组合仪表功能的要求。