谐波齿轮减速器效率测试系统的研究

介绍一种基于LabVIEW8.5的谐波齿轮减速器效率测试系统的测试原理和系统结构,并从硬件、软件两个方面对系统进行介绍.该系统将硬件试验台、传感器、数据采集卡、计算机和LabVIEW软件结合起来,运用先进的虚拟仪器技术进行谐波齿轮减速器效率试验,以较低的成本实现高精度、高质量的测试功能,是对减速器效率测试方法的一种发展,为谐波齿轮减速器性能的研究及进一步的优化设计提供参考.     

工业机器人用谐波减速器精度测试系统研究

谐波减速器是工业机器人传动系统核心部件之一,为了提高国产谐波减速器传动性能,研发了一套高精度谐波减速器精度综合测试系统。该测试系统可对谐波减速器的回差、运动误差和平稳性误差进行实时动态测试,为国内谐波减速器出厂检验提供了参考。     

RV减速器柔性因素对动态传动误差影响分析

为研究RV减速器柔性因素对传动精度的影响,以BX40E减速器为研究对象,综合考虑支承弹性变形及齿轮接触弹性变形对系统动态传动精度的影响,建立多自由度RV减速器动力学模型,提取系统的动态响应;探究变载、变速条件下各级传动接触及支承变形对动态传动误差的贡献量,量化分析BX40E减速器传动误差对各柔性因素的灵敏度。结果表明：动态传动误差随负载增加而增加,输出转速平稳性随负载和转速增加而下降;二级传动的接触变形对减速器传动误差贡献最大,柔性支承贡献次之;传动误差对“摆线齿轮-曲拐”处及“行星架-曲柄轴”处支承刚度的敏感度高于其他支承处,对二级齿轮接触刚度的敏感度高于一级传动。     

苛刻空间环境下固体润滑涂层在谐波齿轮减速器表面的服役性能评价

随着航天技术和深空探测的发展,传统的脂润滑材料已难以满足谐波减速器在真空宽温区的润滑需求,固体润滑涂层是一种非常理想的空间润滑方式,具有较宽的温度使用范围,且润滑性能受工况的影响也较小,广泛应用于空间运动机构。目前固体润滑谐波减速器在苛刻空间环境下的使役性能（传动精度和传动效率）还鲜有报道,通过物理气相沉积技术分别在XBS-40-100型和XBS-60-120型谐波减速器制备MOSTP&MOSTP和DLC&MOSTP两种固体润滑涂层,并对润滑前后的谐波齿轮减速器的传动精度、传动效率及真空高、低温适应性进行对比研究。研究结果表明：谐波减速器的传动误差不仅没受到润滑涂层的影响,其传动精度还远优于脂润滑的同型号谐波减速器;固体润滑谐波减速器具有优异的温度适应性,XBS-40-100型和XBS-60-120型谐波减速器在-90℃～100℃温度范围内,传动效率分别为69.4%～82.8%和66.2%～86.7%,远高于全氟聚醚（-90℃,效率在30%左右）和多烷基化环戊烷（-90℃,效率基本在15%左右）润滑的同型号谐波减速。系统研究了固体润滑谐波减速器的使役性能和温度适应性,可...     

精密齿轮传动误差检测试验台的设计

齿轮传动被广泛应用于各种要求平稳性好、传动精度高等场合,其传动误差是影响传动精度的主要误差来源。利用动态齿轮传动误差原理和虚拟仪器技术,集成高精密光栅角度传感器,搭建一套测量单齿啮合和整箱(变速箱)传动误差的综合测量试验台,具有贴合实际工况、自动化程度高、严格测试节拍、测试精度高等优点。试验结果验证了该测试系统能够快速准确测量精密齿轮和变速箱传动误差,以期对齿轮修形优化并提升变速箱的整机性能提供参考。     

齿轮传动误差主要影响因素分析与计算

齿轮在传动的过程中会因为各种因素产生传动误差进而影响到齿轮传动的工作精度、震动噪声、可靠性以及使用寿命等。在研究由齿轮加工误差、轴偏心和装配间隙三个传动误差主要来源的基础上,综合各单元误差建立了齿轮传动链的传动误差函数。同时对一典型二级齿轮减速器进行了仿真计算,结合频谱分析对其传动误差进行初步的分解与溯源,得出误差占比分布状态和误差主要影响因素,为齿轮减速器产品设计提供了一种误差预测方法并指出制造安装时需主要保证精度的传动环节。     

工业机器人谐波减速器的传动误差超限故障诊断

为解决工业机器人谐波减速器使用过程中传动误差超限故障诊断问题,建立伺服电机和谐波减速器的机电仿真模型,分析减速器间隙增大对驱动电机电流产生的影响。构建工业机器人谐波减速器机电系统实验平台,采集不同传动误差谐波减速器对应的驱动电机电流信号。利用电机电流信号,提出结合梅尔倒频谱和支持向量机,以及结合梅尔倒频谱和概率神经网络的2种故障诊断方法。基于多种指标综合分析比较上述2种故障诊断方法,结果表明:结合梅尔倒频谱和支持向量机的谐波减速器传动误差超限故障诊断方法综合性能优于结合梅尔倒频谱和概率神经网络的方法。     

轻工机械中谐波传动的振动测试分析

采用ＨＰ５４２３Ａ分析仪，对谐波齿轮减速器进行了振动实验测试及频谱分析，由振动响应的频率结构确定了此类传动机构的振动特征，即减速器的扭振和弯振情况，并定性地分析了各种振动产生的原因     

RV减速器传动误差分析及ADAMS仿真

以RV减速器为研究对象,分析了零部件的加工、装配误差对RV减速器传动的作用形式,将LIN的平移扭转耦合模型和质量弹簧误差等价原理相结合,建立该系统动力学传动误差的数学模型并进行求解;并以数学模型参数为基础,基于ADAMS动力学仿真软件建立了含有各类误差的三维模型并进行了仿真分析,通过对仿真的RV减速器输入输出速度数据的测试分析得到传动误差为2″～40″,与数学模型计算结果相似;通过对RV减速器数学模型计算的传动误差和ADAMS仿真的传动误差频谱图分析,得出影响传动误差大小的主要因素是二级摆线针轮传动。仿真结果验证了数学模型的准确性。     

基于ADAMS的RV减速器传动误差仿真分析

以RV减速器为研究对象,结合其结构特点和传动原理,建立系统动态传动误差的数学模型并进行求解。建立RV减速器三维装配模型,导入ADAMS仿真软件。利用MATLAB中的New-Mark法计算仿真得到的输出速度,获得减速器传动仿真误差,并进行频谱转换,与数学模型计算的结果进行对比。搭建RV减速器传动误差的测试实验平台,测量RV减速器的传动误差。通过对比实验结果、仿真结果、数学模型计算结果,验证了仿真模型和数学模型的准确性。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

A STUDY OF TEMPERATURE-DEPENDENT VALENCE BOND STRUCTURE OF TITANIUM

On the basis of energy and shape method for the determination of the valence bond (VB) structures of crystal, the valence bond structure of titanium is redetermined at room temperature and calculated in the whole temperature range of 0-1943K. The outer shell electronic distribution of Ti is e_c~(2.9907) · (s_c~(0.4980) d_c~(2.4927)) ef1.0093 in crystal. The temperature dependences of the VB structures of hcp and bcc phases are the same. The VB structures of hcp and bcc phases monotonically increase or decrease with the increase in temperature, but show discontinuous changes at the phase-transformation temperature 1155K.     

Structural Optimization of Electromagnetic Swirling Flow in Nozzle of Slab Continuous Casting

During the slab continuous casting process, the flow field of molten steel in the mold plays a decisive role in the quality of the slab. In this paper, electromagnetic swirling flow in nozzle technology is proposed to control the flow field in mold.This technology can drive molten steel to rotate inside the submerged entry nozzle by electromagnetic force, thereby controlling the flow field. This research shows that it can reduce the impact of molten steel on the bottom of nozzle and partly reduce the negative pressure at the upper part of nozzle outlet which is even eliminated by optimizing the structure and angle of nozzle. The area of heat flux of the mold wall becomes larger, and the crest value of heat flux gets lower than that without swirling in nozzle and any nozzle optimization. The meniscus fluctuates smoothly, and the flow velocity at the top surface is within a reasonable range. The temperature field distribution in the mold is uniform which was beneficial to the growth of equiaxed crystal and decreased element segregation.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).