摘要：An optimal configuration of the flux-reversal linear synchronous motor (FRLSM) with the optimal number of attachment permanent magnets (PMs) was presented. The optimal model of 2 000 N was designed to reduce the detent force by redesigning the air-gap structure and skewing. The design parameters,mover PMs and stator core,were selected for optimal design by DOE. The thrust and the detent force of the designed optimal models were compared by finite element analysis (FEA). As a result,the thrust of the optimal model is slightly decreased by 1.97% compared with the basic model,and the detent force of the optimal model is greatly decreased by 88.47% compared with the basic model.

摘要：The use of design method considering a coil temperature to maximize the thrust density of a double side coreless permanent magnet linear synchronous motor(PMLSM) was *** optimal current density where the coil temperature reaches an allowable temperature with heat analysis was applied to a magnetic circuit *** optimal current density is verified whenever the design parameters of the motor are *** design parameters of the motor were applied to thrust *** this way,the optimal model,which is a reversal of the existing design method,is *** results were compared with the experimental data to verify their *** the convection heat transfer coefficient is applied to other models,the results of the analysis and test values show good *** method proposed has some limitations.

摘要：A discontinuity of magnetic circuits according to the end effect is generated in the permanent magnet linear synchronous motor （PMLSM）. Due to the unbalanced back electro-motive force （EMF） and impedance produced, unbalanced current is generated. The cireulatin8 current, which is caused by a decrease in the thrust, is generated by the unbalanced current. The optimal design of auxiliary-teeth at the end of the mover was carried out to solve the unbalance of phase by using design of experiment （DOE）, and compared with the basic model through finite element analysis （FEA）. As a result, the auxiliary-teeth model compensates for the decrease of thrust caused by the unbalanced phase. Also, this model is proven to reduce the detent force by the vibration and noise of the PMLSM and copper loss caused by the circulating current.

摘要：The long-term adjustment processes of atmosphere and ocean in response to gradually increased atmospheric CO2 concentration have been analyzed in 70 and 140 a integrations with NCAR fully-coupled climate system model (CSM). In these experiments the CO2 concentration has been increased to double and quadruples the initial concentration, respectively. After 70 a, at the time of CO2 doubling, the model predicts surface air temperature rises by 1.2 and 1.5 K for the globe and the northwestern Pacific Ocean, respectively. The behavior of the quadrupling run is similar: each global and regional mean surface air temperatures increase by 2.8 and 3.0 K at the time of CO2 quadrupling. From the experiments, surface air temperature changes in the northwestern Pacific Ocean will be more distinctive compared with the global average, mainly due to exceptionally large wanning and sea level change near the entrance of the Kuroshio extension.

摘要：为了在新车型设计阶段发现漏水问题,提出基于体素的汽车装配体潜在漏水缝隙的识别与可视化方法.在汽车装配体模型体素化的基础上,通过定义相邻零件之间的缝隙体素,重构三角网格曲面并提取零件的边界边,以确定表达漏水部位的边界体素;基于所提出的映射点生成算法计算缝隙间距并构建缝隙曲面;通过由弦高误差控制的自适应细分方法降低缝隙曲面边界到零件曲面的误差,利用彩色云图进行可视化显示.该方法能够精确识别汽车的全部潜在漏水部位,并可以直观显示漏水部位的缝隙大小,以快速验证水密性设计的合理性,避免出现先天设计缺陷而造成声誉与经济损失.该方法还可以应用于航空航天、造船、化工等行业的大型复杂产品设计.

摘要：内置式永磁同步电机的工作点可能随着参数变化而偏离理想的最大转矩电流比(MTPA)轨迹,因而导致系统不能获得最优转矩-电流特性。针对这一问题,提出了一种在线识别定子交轴电感、转子磁链的模型参考自适应(MRAS)参数辨识方法。该方法在分析辨识模型欠秩问题和评估MTPA轨迹随参数变化偏离程度的基础上,推导了MRAS辨识模型,采用Popov超稳定性理论设计了满秩辨识器及其增益矩阵,并利用参数辨识结果计算定子电流工作点,以达到实时更新和跟踪MTPA轨迹的目的。仿真与实验结果验证了所设计方法的可行性和有效性,该方法显著提高了内置式永磁同步电机MTPA控制系统的转矩-电流特性。

摘要：利用Fluent软件模拟研究了LY-060型碟式离心净油机内部流场。采用周期性结构化网格、标准k-ε方程湍流模型、旋转移动壁面和SIMPLE算法模拟了不同转速下流体在碟片通道中的运动状态,并系统分析了不同转速下内部流体的周向速度、轴向速度、径向速度及动静压力。研究表明:转鼓利用负压自动吸入油液,随着转速从6 000 r/min增加到10 000 r/min,转鼓内部流体的周向速度、轴向速度与动压增大趋势明显,而径向速度变化较小;流体周向速度相对于碟片存在3%的滞后;沉降面积比越大的区域流体转速滞后率越小,沉降面积最大的碟片倾斜通道是离心分离的主要区域;转筒外壁轴向速度最大且随转速增大幅度约为0.5 (m/s)/(1 000 r);动压对流体运动影响较大,随着碟片转速的改变,动压增幅比静压大46%。在此基础上设计了一种体积小、便携性好的碟式离心净油机,可使航空液压油质量至少提高一个等级。

摘要：近年来,随着冶金技术的发展,屈服强度在460 MPa及以上的高强度钢材和超高强度钢材已在我国实现了工业化生产。这类钢材采用热处理工序获得特定的微观结构,优化其材料属性和机械特性,在建筑结构的受力性能、经济效益和节能减排等方面都具有突出的优点。然而,一些研究人员指出,由于冶炼过程中必须的热处理工序,这些高强钢的微观结构在焊接过程中很容易受到影响,发生金属相变,导致焊接热影响区的各种机械性能降低。因此,有必要对建筑工业实用尺寸(如10~30 mm厚)的高强钢Q690和Q960板焊接后结构表现进行深入的研究和量化评估。针对这一问题,首先对Q690和Q960钢材10~30 mm厚的母材试件进行了单调拉伸试验,获得其机械性能。同时,对高强钢Q960在熔化极气体保护电弧焊不同焊接热输入下的焊接接头进行了单调拉伸试验,研究焊接热输入对其屈服强度、抗拉强度、延伸率等的影响,并依据相关试验数据开发了针对Q690和Q960中厚板特定热输入的焊接工艺规范。之后,采用此焊接工艺规范进行加工,并在香港理工大学结构工程实验室对共计36个不同对接拼接焊热输入、不同截面分类的Q690和Q960焊接拼接短柱开展了全面的轴压试验研究,量化了在不同焊接热输入下的高强钢Q690和Q960焊接拼接短柱在轴向压缩下的截面承载力,并将试验结果与现行欧盟规范EN 1993-1-1中的设计要求进行了比较。最后,分析了现行欧盟规范EN 1993-1-1中对于截面分类的规定在高强钢Q690和Q960短柱焊接工字形截面和箱形截面上的适用性,提供试验数据,提出了对现有截面分类规定的一些意见。

摘要：目的:探讨应用计算机辅助设计和快速原型技术,重建下颌骨三维模型,在基于模型的基础上矫正下颌骨不对称畸形的方法。方法:13例先天性下颌不对称畸形患者,行电子束CT扫描及三维重建,应用计算机辅助制造与激光快速原型技术制作下颌骨实体模型,根据模型显示的畸形类型与程度设计手术方案并在术中指导操作;应用反求技术计算出偏小侧下颌部分恢复至对侧大小所需填充物的形状并快速成型制造出填充材料的模型,以此为参照雕刻填充材料并确定植入位置;畸形矫正手术包括一侧下颌角部分截除及外板切除、一侧下颌区假体填充成形、颏部水平截骨移位成形及假体隆颏等。结果:应用快速原型技术制作的下颌骨实体模型直观、精确地显示畸形下颌骨的立体结构,在此基础上进行的模型外科操作能辅助手术设计、指导手术进行。手术过程顺利,所有患者术后下面部外形均得到不同程度的改善,达到术前设计的预期效果。随访6月～2年,面部外形良好,手术效果满意。结论:计算机三维设计与快速原型技术能真实再现畸形颌骨的形态,为准确诊断、设计手术方案与指导手术进行提供理想的外科模型,对颅颌面畸形的矫正具有良好的辅助作用。