出口加强杆结构与布置方式对风机性能影响的试验研究

为保证风机出口蜗板面的平整,往往在风机出口采用加强杆进行固定。改变出口加强杆的高度与位置对风机性能会产生一定的影响。本文通过试验的方法对加强杆的高度与风机实际出口高度之间的最佳比值范围区间展开分析,给出了改善性能的合理匹配区间。     

炉压控制在铸件热处理中的应用

通过对炉压控制技术的分析,介绍了炉压控制在热处理炉的应用,详细论述了炉压控制在实际应用中所面临的问题及其解决方法。     

三大偶件磨损对供油量和供油压力的影响

柴油机三大偶件是整个系统的关键部件，磨损之后严重影响柴油机的工作性能。通过实验，分别测量三大偶件磨损后柴油机的供油量和供油压力波形，并对三大偶件对柴油机的供油量和供油压力的影响作了定性分析，为柴油机燃油系统的故障诊断提供了一个可靠的方法和依据。     

花键轴齿形成形中齿根开裂的研究

应用有限元分析软件,对花键轴的齿形成形过程进行模拟.通过研究应力分布,证实齿根开裂现象的发生,找到齿根开裂的原因.通过分析断裂因子的分布和变化,预测可能发生开裂的位置.结合六齿矩形花键轴实际成形情况进行模拟计算,获得了入模半锥角的较佳取值范围.     

对JT-6-19推焦车推焦杆震动的探讨

JT-6-19推焦车在推焦杆推焦进退过程中,出现不同程度的震动.分析推焦杆推焦中的各种因素及受力情况,找出主要因素,减小水平度公差,减小震动.     

The Inclusion of the Geometrical Shape of the Cutter into the Optimisation of the Milling Process

The paper deals with the optimisation model of cutting variables by which the manufacturing costs should be reduced to the lowest possible value. The optimisation strategy takes place in two steps by taking into account all input variables (technological limitations). First, the tool geometric variables are changed using selected cutting variables; in this way, the smallest cutting force variables are determined. Geometric variables for the case of the smallest cutting force are used for the second optimisation step in which the cutting variables are changed. Optimisation of the cutting variables is tested practically under workshop conditions. In this way, important information about the validity of the optimised values is obtained. If there are significant differences between the theoretical and practical values, then the theoretical values must be corrected (correction of cutting variables). As the study of the cutting processes requires much experimental and theoretical work and applies to a very large body of data, we have organised an information centre for cutting conditions. When forming the information centre for cutting conditions, it was impossible to avoid the requirement that the technological database must be actively included in the computer-supported integrated manufacture.     

Study of the influence of the friction clutch operability on the performance of the switch motor

In this paper, the results of studying the efficiency of an SP-6 M switch motor have been presented. The friction clutch plays an important role during the transmission of torque from a motor to an actuator. To study a motor switch, a test rig was developed in order to determine the necessary force to move switchblades depending on the pressing force of the friction clutch. The tribological properties of the friction disk materials have been investigated using a specially designed test machine.     

COG倒装设备的控制系统研究

玻璃覆晶封装技术是一种将裸晶片互连到玻璃基板上的封装技术。通过计算机控制系统,基于PLC的伺服驱动系统、图像处理系统、温度控制系统和压力控制系统等,实现高稳定性和准确工艺要求下的Ic芯片和玻璃基板的粘贴动作的形成和协调;并对开发的PLC控制系统进行了优化,实现了生产效率的提升。     

Research on the Distance of the Active Sonar under the Effects of the Thermocline

The existence of thermocline changes the acoustic structure and effects the direction of the sound rays.This paper analyzes the working process of the active sonar,and the mathematical models.The detection probability of the active sonar under thermocline is studied.First,the detection distance without thermocline is estimat-ed,then the effect of thermocline's depth and sound velocity changes on detecting submarine probability are discussed,and based an this,the effects of the sea condition on searching submarine probability is discussed,lastly the distance of active sonar is calculated under ther-mocline. The results indicate that under thermocline,the distance of the active sonar becomes obvious short,and with the sea condition becoming rough,the effect is more clear.     

Determination of the parameters of the dispersion curves of lamb waves with the use of the Hough transform of the spectrogram of an AE signal

A method for the recognition of dispersion curves on the spectrogram of acoustic-emission signals has been developed based on the Hough transform. The method was successfully tested in an experiment using a Hsu-Nielsen source. It has been determined that the suggested method can determine the distance from the source of a signal, even when the signal arrives only at one acoustic emission transducer. This enables one to perform AE testing only with one-sided access to any dimensional object or when there is a sufficiently large distance between transducers, when an AE signal reaches only one of them.     

轴流风机叶片断裂的原因分析及系统对风机性能影响的探讨

对某厂房轴流风机叶片断裂的原因进行了分析,探讨了系统对该风机的性能影响,从而制定了切实可行的措施,使该风机安全运行。     

带式输送机转载溜槽导流板结构形状的分析

针对带式输送机转载溜槽设计问题,分别对普通冲击板、WEBA型冲击板、曲线型导流板、折线型导流板进行DEM仿真,对料流的速度矢量、冲击力和冲击系数进行了对比,根据仿真结果的观察和冲击力比较得出:WEBA型冲击板由于实现了料打料,降低了对冲击板的磨损,但导料效果不明显;曲线导料槽可以降低物料对衬板的冲击,并具有较好的导流效果;折线型导流板能够起到降低冲击和导流的作用,折线段越多降低冲击、导流效果越明显。研究结果为工程设计中冲击板或导流板结构形式的选择提供参考。     

Quality of the surface finish of the head of the femoral component and the wear rate of the socket in long-term results of the Charnley low-friction arthroplasty.

Four Charnley femoral stems, removed on average 20 years after implantation, were examined for the quality of surface finish of the head. The average roughness was 0.031 microns (range 0.008-0.102 microns) as compared with 0.019 microns (range 0.008-0.031 microns) for the current production models and 0.05 microns as recommended by the British Standard and the International Standards Organization. The average socket penetration rate was 0.022 mm/year and there was no radiological or operative evidence of socket loosening. The findings emphasize the importance of achieving and maintaining good surface finish of the head of the femoral component. A suggestion is also made that the orientation of the asperities may be important.     

基于怠速不稳诊断技术的探索

在自诊断法基础上,对三种车型的怠速不稳因素做进一步的分析,探析其原因,并提出新的诊断技术思路.     

改进燃烧系统提高车用柴油机的性能

阐述了燃烧系统对发动机性能的影响；介绍了双ω型燃烧室；设计了与车用柴油机相匹配的双ω燃烧室；优化了喷油系统参数，列出了相应的试验研究成果。     

基于UG-NX4平台KBE技术在汽车覆盖件模具设计中应用

总结了传统汽车覆盖件模具设计的不足之处,提出将KBE技术应用于汽车覆盖件设计可以克服这些不足,并对基于UG-NX4这一技术的实现给出实例,旨在推动这一技术的应用,提高我国覆盖件模具设计的水平。     

矿井通风机扩散器弯头结构处导流板布置方式优化研究

通过对矿井通风机扩散器弯头结构处常见的导流板布置方式进行对比分析,采用有限元流体计算方法,对常见导流板布置方式的优缺点进行了说明,并且加入了长圆弧导流板的数值模拟分析,为矿井技术人员在通风系统实际应用方面提供了依据.     

花键联接磨损的可靠性设计

本文介绍了利用磨损量-工作寿命分布数据来预测花键联接的可靠度的方法。     

压力对涡流管性能影响的实验研究

采用自行设计的涡流管，并以空气作为工作介质，通过实验研究了在保持膨胀比不变的情况下，不同进口压力对涡流管性能的影响。实验结果表明：对于常温涡流管，在较小的膨胀比下，进口压力的改变对涡流管的制冷性能没有显著的影响；随着膨胀比的增加，进口压力的改变对涡流管制冷性能的影响也变得越来越显著。膨胀比为3时，进口压力的增加基本不影响涡流管的制冷性能，而膨胀比为6时，随着进口压力的增加，涡流管的制冷性能显著提高。     

Studying the statistical indicators of the radiation hardness of PWO crystals for the barrel of the electromagnetic calorimeter of the CMS project

The results from experimental and certification measurements of the optical transmission and technical light yield of a technological lot of PWO crystals intended for the central part of the CMS electromagnetic calorimeter at CERN are analyzed. Statistical estimates of the crystals radiation hardness are obtained, allowing the calorimeter energy resolution to be evaluated under operating irradiation conditions.__________Translated from Pribory i Tekhnika Eksperimenta, No. 2, 2005, pp. 71–77.Original Russian Text Copyright © 2005 by Dormenev, Annenkov, Borisevich, Drobyshev, Korzhik, Rudov.