激光再制造三维运动光束头

基于激光制造技术相关理论，设计并制造了激光同轴转动三维运动光束头。分析了三维运动光束头工艺参数对熔覆效果的影响，并讨论了其在工业应用实验中取得的效果。结果表明，该三维运动光束头能绕竖直轴转动和水平轴摆动;在参数一定的条件下，随着光束头摆动角度的增加，熔覆效果越来越不理想，理想的摆动角度为0°～45°;配合送粉头的粉末流聚焦及焦点可调功能，该光束头可以实现曲轴、螺杆、叶片等复杂型面零件的制造和再制造。     

用于激光快速制造的三维送粉头的分析与研究

针对设计中难以求出用于激光快速制造的三维送粉头解析解的难题,借助有限元分析程序ANSYS,对其进行了强度分析和模态分析.然后采用安装有三维送粉头的横流式5kW CO_2激光器和5轴数控机床,对35#钢进行了激光淬火和激光熔敷实验,所得结果验证了有限元分析的可靠性,所做的研究为送粉头的设计和改进提供了有益的参考.     

Control strategy optimization for energy efficiency and harmonic mitigation in multi-series converters

To provide electrical power for the Research System of Superconducting Magnets (RSSMs) including the background field superconducting magnet and the tested superconducting objects, the high power phase-controlled converter will be used to develop the power supply system. However, because of its inner nonlinear feature, the current harmonics and the reactive power are injected into the AC power supply system. To improve the quality of the power supply system for RSSMs, an improved synchronous control strategy is suggested for the superconducting magnet power supply system, which comprises four series-connected six-pulse converters fed by a phase-shifting transformer, respectively. According to the proposed control strategy, the basic unit is two 12-pulse converters and the control method will be changed in terms of load fluctuations which are represented by the per unit value of converter output voltage. As a result, harmonic is greatly reduced but the power factor is also high.     

退火工艺对Fe91.63B1.27Si7.09非晶带材软磁性能的影响

针对采用单辊甩带法制备的Fe_(91.63)B_(1.27)Si_(7.09)非晶合金带材,在不同温度下进行退火处理,利用X射线衍射仪(XRD)、热分析仪(DTA)、振动样品磁力计(SEM)、差示扫描量热法(DSC)对退火后的非晶特性及其软磁性能进行研究。结果表明:Fe_(91.63)B_(1.27)Si_(7.09)非晶带材具有很好的软磁性能,其饱和磁化强度可以达到74.37 k A/m,矫顽力达到12.04 A/m,带材样品在495.17℃开始晶化,剩余磁化强度Mr、矫顽力Hc增大;当温度升高到717.67℃时,非晶带材完全晶化,剩余磁化强度Mr、矫顽力Hc数倍于非晶态带材。XRD实验结果表明,退火温度达到700℃时,合金中出现Si4Cu15析出相。     

Conceptual Design and Analysis of Cold Mass Support of the CS3U Feeder for the ITER

In the International Thermonuclear Experimental Reactor(ITER) project,the feeders are one of the most important and critical systems.To convey the power supply and the coolant for the central solenoid(CS) magnet,6 sets of CS feeders are employed,which consist mainly of an in-cryostat feeder(ICF),a cryostat feed-through(CFT),an S-bend box(SBB),and a coil terminal box(CTB).To compensate the displacements of the internal components of the CS feeders during operation,sliding cold mass supports consisting of a sled plate,a cylindrical support,a thermal shield,and an external ring are developed.To check the strength of the developed cold mass supports of the CS3U feeder,electromagnetic analysis of the two superconducting busbars is performed by using the CATIA V5 and ANSYS codes based on parametric technology.Furthermore, the thermal-structural coupling analysis is performed based on the obtained results,except for the stress concentration,and the max.stress intensity is lower than the allowable stress of the selected material.It is found that the conceptual design of the cold mass support can satisfy the required functions under the worst case of normal working conditions.All these performed activities will provide a firm technical basis for the engineering design and development of cold mass supports.     

单片机控制的智能型太阳能热水器研究

为了提高太阳能的利用率,设计了智能型双轴太阳能热水器.该装置以手动调节实现集热管绕水平轴的转动,利用涡轮蜗杆机构的自锁功能实现集热管绕垂直轴的转动;以89S52单片机为核心,依据模块化设计思想,构建了自动控制跟踪系统;以电机定时转动和系统休眠的控制方法减小系统的电能消耗.基于多学科协同仿真技术,对该装置进行了强度分析,对以太阳能电池板代替太阳能集成管的实验装置的测试结果表明,该设计产生的电能提高了20%.     

采用虚拟样机技术的某驱动桥壳的动载荷获取研究

根据驱动车桥具体的实际使用情况,应用多体动力学(MBD)仿真软件MotionView建立相关悬架总成的力学仿真模型,对车桥工作的三种极限工况进行仿真分析计算,输出零件运动关系和相互作用力,得到驱动桥壳在典型工况下相关位置的最大动载荷,为下一步进行有限元计算和结构优化设计提供参数依据。     

某工程机械主减速器壳的逆向改型设计

在分析了逆向改型设计技术用于产品开发的流程基础上,运用逆向扫描设备得到了某工程机械的驱动桥主减速器壳体的点云数据,继而利用三维CAD软件对其进行了数据的重构及改型设计,最后根据其使用特性借助有限元软件对改型后的结构进行了静力学及模态分析,该方法显著地提高了工作效率,缩短了新产品的开发周期。     

矿用工程机械驱动桥壳的协同仿真技术研究

为验证某工程机械驱动桥壳工程设计的可靠性,借助三维设计软件CATIA和有限元分析软件ANSYS,基于协同仿真技术对建立的桥壳中面模型进行了研究。所得分析结果表明,该桥壳结构合理,能较好地满足工程应用,进行的研究为工程机械驱动桥壳的研发提供了有益的参考     

直拉式单晶硅生长炉超导磁体研究

高集成度芯片发展使半导体行业对硅单晶材料提出尺寸与质量的要求。直拉法（Cz 法）可生成大尺寸硅单晶,但生长中产生热对流,边界层不稳定,晶体易生杂质。因磁场对导电熔体内对流有抑制效果,通过外加磁场可提高生成大尺寸晶体的品质。基于现有研究结果提出了一种用于单晶炉的瓦状结构超导磁体,确定线圈结构参数、导体类型、屏蔽体厚度及磁芯高度,使其满足大尺寸、高品质单晶硅生长所需的磁场强度（约 0.5T）及磁场位型,从而降低漏磁。借助数值分析优化超导磁体结构参数,有望为后续的 MCZ 硅单晶生长工艺参数提供参考。