SGXP—400液压泥炮的应用及其性能分析

通过本钢５＃高炉液压泥炮的技术改造实践，阐述了斜底座式液压泥炮在大型高炉上的应用情况，并且进一步对ＳＧＸＰ—４００液压泥炮的某些性能特点及其液压系统进行了分析。     

关于后张预应力混凝土结构优化设计的几个问题

结合UP软件编程实践，本文对后张预应力混凝土结构计算程序中引入优化功能的意义进行了论述，提出了预应力筋与普通钢筋之间的最优搭配关系，优化原点概念及相关影响因素，列出了优化计算程序所应涉及的基本计算内容，并对当前后张预应力混凝土结构设计中的一些观点提出了不同意见。     

液压系统广义可靠性设计

介绍了广义可靠性和有效度的基本概念，简要论述了对液压系统进行广义可靠性设计的重要性，并从可靠性设计和维修性设计两方面提出了提高液压系统有效度的具体措施。／     

柳钢2800mm中板轧机液压自动厚度控制系统

介绍了柳钢2800mm中板轧机液压自动厚度控制（HAGC0系统工艺参数与系统的结构、特点和功能。系统还包括平面形状控制、动态规程自动和控制轧制技术，构成一个较完善的控制系统。     

对编写《水轮机》新教材的建议

提出适应新的中等职业《水轮机》教材和课程教学大纲的修改建议。     

Analytical, numerical and experimental investigations of transverse fracture propagation from horizontal wells

This paper presents results of a comprehensive study involving analytical, numerical and experimental investigations into transverse fracture propagation from horizontal wells. The propagation of transverse hydraulic fractures from horizontal wells is simulated and investigated in the laboratory using carefully designed experimental setups. Closed-form analytical theories for Mode I (opening) stress intensity factors for idealized fracture geometries are reviewed, and a boundary element-based model is used herein to investigate non-planar propagation of fractures. Using the mixed mode fracture propagation criterion of the model, a reasonable agreement is found with respect to fracture geometry, net fracture pressures and fracture propagation paths between the modeled fractures and the laboratory tested fractures. These results suggest that the propagation of multiple fractures requires higher net pressures than a single fracture, the underlying reason of which is theoretically justified on the basis of local stress distribution.     

峡口水库沥青混凝土面板的施工与试验

以灌溉、防洪为主的峡口水库大坝，为沥青混凝土面板堆石坝，为研究低温抗裂性能，对沥青混凝土面板破损取样，进行了配比和多种力学性能试验，并与原面板设计指标进行了对比。由于面板经受住了－20℃以下的低温考验，其所用沥青指标、破损取样试验结果，特别是冻断低温指标，对确定水工沥青混凝土低温抗裂检验标准有重要参考价值。     

POCV-200/31.5型液控单向阀

介绍了一种用于液压支架大流量、快速移架系统中的POCV——200／31．5型液控单向阀的工作原理和结构特点。分析了该阀的性能，并指出了其推广应用前景。     

济钢中厚板厂3500mm精轧机快速换辊自控系统

中厚板厂3500mm精轧机快速换辊自控系统，集可编程序控制器、变频传动技术、液压控制于一体。实现了工作辊、支承辊准确、快速地更换。通过网络技术与其他控制系统进行数据交换、操作及连锁，使轧制生产线实现了全自动化轧制，不仅改善了工人的劳动强度，还提高了产品的产量及质量，取得了巨大的社会效益及经济效益。     

Adhesive element modelling and weighted static shape control of composite plates with piezoelectric actuator patches

A novel finite element model is presented for static and dynamic analysis of composite plates integrated with a laminated piezoelectric layer, a host laminated composite plate and an adhesive layer between them. A new adhesive element is developed which includes both peel and shear effects in the adhesive layer based on first‐order shear deformation plate theory. The thin adhesive layer between the piezoelectric layer and the host plate is modelled by assuming that it carries constant shear and peel strains throughout its thickness. In addition, a weighted static shape control scheme for finding the optimal voltage distribution for static shape control is given. By selecting different weighting matrices, a variety of items such as displacements, slopes, curvatures, strains and even generalized forces, can be included in finding the optimal actuating voltage for static shape control. The present model is validated by comparing with those results available in the literature. The numerical results show that the weighted linear least method can give a satisfactory voltage distribution to best match the desired shape. Copyright © 2004 John Wiley & Sons, Ltd.