腹腔镜手术器械手柄人因工程设计与评价

传统腹腔镜手术器械手柄容易造成医生手部不适.增大接触面积和改变手部受力部位可提高手柄舒适度.利用逆向工程技术,获取人体手掌肌肉曲面特征,设计一款新型手柄.通过点云偏差分析,验证逆向工程设计的手柄曲面基本符合手掌曲面变化,偏差平均值为0.63mm.运用有限元分析方法,验证手部受力区域主要集中于大、小鱼际处.设计腹腔镜手术模拟实验,采用问卷调查与表面肌电信号检测的方法进行可用性评价.新手柄在主观评价上优于比对手柄,且存在显著性差异(P＜0.05).使用新手柄时肌肉疲劳度轻于比对手柄,但无显著性差异.     

非自动衡器测量不确定度评估及其在符合性判定中的应用

以OIMLR76国际建议中非自动衡器的称量试验为例,列举了2种容易对非自动衡器称量性能做出误判的情形.结合电子天平称量试验的3个案例,分析了修正误差与最大允许误差限较为接近时,直接采用"简单判定原则"作出符合性判定的误判风险,通过对线性载荷误差测量不确定度评估,分别对3个案例给出了95.45％、80.6％和18.1％的...     

LabVIEW在振动系统特性参数测量中的应用

传统的共振法测量振动系统动态特性参数存在着仪器利用率不高、可重构性较差等问题。运用图形化编程语言LabVIEW设计了振动参数测量及动态特性分析软件,利用"软件就是仪器"的技术方法,对振动系统的加速度、速度、位移信号,进行实时处理、显示以及频谱分析,实现了固有频率、阻尼比等动态特性参数的估计。     

基于虚拟仪器的声场可视化系统

基于虚拟仪器技术设计与实现了一种用于声场可视化的声信号采集与处理系统。该系统的功能包括声压信号采集和预处理,加载重建算法进行声场重建以及结果的可视化表示。系统硬件部分包括传声器阵列、数据采集卡和控制计算机。软件设计应用虚拟仪器的概念,并采用LabVIEW和MATLAB混合编程。通过实验测试,验证了该系统的实用性。     

制作微器件的超声电解复合微细加工基础研究

提出一种制造MEMS微器件的新技术——超声电解复合微细加工；设计微细加工工艺系统，进行一系列微细加工基础工艺试验，验证超声电解复合微细加工在微器件制造中的可行性．展示了该技术在提高微细加工精度、效率、表面质量等方面的优势，研究成果对完善MEMS器件制作技术具有重要理论意义与实用价值。     

Qualitative analysis of files of four different rotary systems,before and after being used for the twelfth time

The aim of this study was to make a comparative evaluation of the surface topography of the cervical third and tip of four different rotary systems, before and after being used 12 times, in resin blocks with simulated root canals with standardized 45° curvatures, and analyzed by scanning electronic microscopy (SEM). A total of 1,440 resin blocks with simulated root canals and standardized curvatures were used. The blocks were divided into four groups and prepared by the crown down technique according to the manufacturers' recommendations: Group 1 (G1)—K3®, Group 2 (G2)—Protaper Universal®, Group 3 (G3)—Twisted Files®, and Group 4 (G4)—Biorace®. After each preparation, the instruments were washed and autoclaved. A total of 24 instruments were selected, being three new instruments and three after having been used for the 12th time, from each group. These instruments were analyzed by SEM. To perform the evaluation, 24 micrographs were observed by 12 evaluators who attributed a score to the images according to a template. In the qualitative analysis of the cervical region and tip of new instruments, it was observe that the files of Groups G4 and G2 were the least rough and those of G1, the roughest. In the same manner, the cervical region of the instruments was qualitatively analyzed after the 12th time of using them, and there was no statistically significant difference at a level of 1% (ANOVA P < 0.01) between G2 and G4 as well as between G1 and G3. As regards the tip, it was observed that there was no statistically significant difference, at a level of 1%, between the groups: G1 and G3, G1 and G4, and between G3 and G4, and there was statistically significant difference at a level of 1%, between group G2 and the other groups, with G3 having the greatest roughness (ANOVA P < 0.01). Microsc. Res. Tech., 2013. © 2012 Wiley Periodicals, Inc.     

基于虚拟仪器的电机转矩转速测试系统

在异步电机矢量控制等高性能电机控制的研制过程中,为了得到电机的运行情况,更好地研究异步电机的控制方案,需要对异步电机的转矩、转速等参数进行采集、存储、显示。分析了转矩转速测量原理,设计了一种基于虚拟仪器的转矩转速测试系统。通过它可方便精确地测量转矩、转速,并将其应用到变频调速试验中。试验表明,该转矩转速测试系统精度高、抗干扰能力强、操作简单,对电机运行中的动静态特性能够快速测定并以直观的图表形式描述出来。     

天车称重系统解析

以河北钢铁集团唐山钢铁有限责任公司一钢轧厂240t天车称重系统为例,介绍天车称重系统的硬件结构、工作原理、传输方式、仪表功能、称重传感器原理、钢丝绳补偿、信号传输、称重仪表等,结合在生产中的实际运行状况,总结出在生产维护中的常见问题,并提出具体的解决方法。     

空分生产用气体分析仪器选购及应用误区

主要就空分生产配套用分析仪器选用方面的一些认识误区加以分析讨论。侧重于国外分析仪器领域。