开关磁阻电机传动技术及其应用

本文主要论述了开关磁阻电机传动技术的工作原理，系统结构和技术性能。介绍了该技术的发展背景、目前的应用情况和国内外发展水平。并对其前景表明了一些看法。     

多变量系统故障诊断和容错控制新方法及其在精馏过程中的应用

本文提出一种多变量系统的故障诊断和容错控制新方法，整个系统由四个神经元组成。将本文方法用于二元精馏塔顶和塔底组分的容错控制，仿真结果证实了本文方法的有效性。该方法可望在难以建模的复杂化工过程中得到应用。     

Knowledge-based diagnosis of drill conditions

One major bottleneck in the automation of the drilling process by robots in the aerospace industry is drill condition monitoring. This paper describes a system approach to solve this problem through the advancement of new machine design, sensor instrumentation, metal-cutting research, and intelligent software development. All drill failures can be detected and distinguished: chisel edge wear, flank wear, crater wear, margin wear, corner wear, breakage, asymmetry, lip height difference, and chipping at lips. However, in the real manufacturing environment, different workpiece materials, drill size, drill geometry, drill material, cutting speed, feed rate, etc. will change the criteria for judging the drill condition. The knowledge base used for diagnosing the drill failures requires a huge data bank and prior exhaustive testing. A self-learning scheme is therefore introduced to the machine in order to acquire the threshold history needed for automatic diagnosis by using the same new tool under the same drilling conditions.     

精轧油膜轴承密封失效机理的初步分析

对油膜轴承密封出现的进水、漏油现象作了大量的调查、测量和统计分析，找出了产生质量事故的根本原因，提出了解决措施。     

Fault-accommodation with intelligent sensors

Optimal sensor fault-accommodation is considered for faults modelled by an increase in measurement noise. This noise is taken to be bounded and its probabilistic properties unknown. It is assumed that intelligent (e.g. self-validating) instrumentation is in use and estimates of the noise bounds are available. The fault-tolerant controller is designed to optimize a noise rejection and a nominal reference tracking index and leads to a mixed norm minimization problem (l₁/l₂). We exploit known results and a particular feedback configuration to show that it is possible to optimize simultaneously without a trade-off the two performance indices. The results are applied to systems where the presence of auxiliary measurements allows for an optimal fault-accommodation strategy. Using properties of the optimal solution, we define a factorization for the optimal controller alternative to the Youla parametrization, leading to an algorithm which is optimal, transparent and efficient.     

Macha爆炸机故障维修十一例

随着Macha遥爆系统在地震勘探中使用年限的增加，该系统在工作中时常出现各种各样的故障，本文根据其日常检修记录，分析总结了Macha系统常见的十一例故障，并从故障的现象、分析、排除三个方面对各个故障进行了详细的介绍。     

疏松砂岩地层出砂对套管损坏的研究

以东濮凹陷文明寨油田历年井况调查的套管损坏资料为依据，在对出砂油井套管损坏形态、层位与射孔状况、岩石性质等因素进行综合分析基础上，对疏松砂岩出砂、上覆岩层坍塌等主要方面导致的套管受力变形进行研究，为探讨防治措施提供依据。     

DIN-100MnCrW4模具钢开裂原因分析

对DIN－100MnCrW4模具钢开裂原因进行了分析。结果表明，模具钢 属淬火开裂，主要原因是材料内部组织不均匀所致。     

推进波作用下的底泥起动

在介绍推进波作用下底泥起动特点的基础上，将上层水体作为粘性流体，底泥作为粘弹性体，推导了推进波作用下泥床面剪应力的表达式，并根据试验结果，给出了推进波作用下底泥起动时的床面剪应力与底泥流变参数的关系。     

Effect of heating-rate on failure temperature of pre-loaded brass H62

The response and failure of brass H62 specimens subjected to different levels of pre-loaded stresses and heating rates were investigated using a Gleeble-1500 thermal-mechanical material testing system. The metallographs of the tested material were also observed and analyzed. It is found that the increase of either pre-loaded stress or heating-rate decreases the failure temperature. Metallographic analysis shows that high heating-rate may cause stronger local thermal inconsistency （LTI） and remarkably increase the microdefects in the material, which may markedly degrade the macroscopic mechanical properties of the material.