关于位置控制模块的"返回数据"在通电开机时自动清零问题的解决方法

本文介绍了位置控制模块的“返回数据”在通电开机时自动清零问题的解决方法及程序编制。     

大功率双电机传动钢缆皮带全数字电控系统

本文以新汶矿业集团华丰煤矿直流钢缆皮带电控改造为背景 ,基于先进的计算机技术和现代电力电子技术 ,提出一种新的钢缆皮带机全数字控制模式。并详细分析了系统的结构及PLC软件部分。     

机场运输拖车制动装置的优化设计

对机场运输拖车的制动装置进行了工况研究、故障分析和合理更新选型，并对选定的带式制动装置的各结构参数，依据最小重量原则进行优化设计。最佳地满足了设计、使用、工艺和经济性要求。     

畴层结构对表面波传输的调制效应

在分析铁电畴层波色散特性、波场的位移特性的基础上，从信号传输的角度出发，分析了畴层波滤波器原理性器件的特性，得出畴层结构的影响，相当于对表面波信号进行了相位调制，理论分析与实验结果吻合     

对GLZC120和LBGLJ185终端锚固线夹的研究

对NLD-4耐张线夹、压缩型耐张线夹和自锁型终锚线夹进行了介绍，分析了各种锚固线夹在使用中存在的问题，提出了适合GLZC120，LBGLJ185的终端锚固线夹的做法，实践证明铝合金模锻终端锚固线夹解决GLZC120，LBGLJ185承力索终端锚固问题比较合理。     

Experimental and finite element analysis of a double strap joint between steel plates and normal modulus CFRP

Strengthening of steel structures using externally-bonded carbon fibre reinforced polymers ‘CFRP’ is a rapidly developing technique. This paper describes the behaviour of axially loaded flat steel plates strengthened using carbon fibre reinforced polymer sheets. Two steel plates were joined together with adhesive and followed by the application of carbon fibre sheet double strap joint with different bond lengths. The behaviour of the specimens was further investigated by using nonlinear finite element analysis to predict the failure modes and load capacity. In this study, bond failure is the dominant failure mode for normal modulus (240 GPa) CFRP bonding which closely matched the results of finite elements. The predicted ultimate loads from the FE analysis are found to be in good agreement with experimental values.     

皮带罩冲压工艺及模具设计

通过对皮带罩零件的冲压工艺进行了分析,确定了合理的工艺方案。介绍了拉深模的设计,分析了拉深时零件项部圆角产生拉裂的原因。提出了解决零件拉裂的措施。通过热处理提高了模具的使用寿命,降低了生产成本。     

连铸机足辊粘结物的调查分析

连铸机运行过程中,其足辊粘附了坚硬的异物,使得铸坯表面被严重划伤。本文通过调查分析辊粘物的组成和显微结构后认为：辊粘物的形成旧由于铸坯表面的氧化铁皮和结晶器保护渣渣膜,各聚在润滑欠佳的足辊上,经重熔或烧结形成坚硬固体,并粘附瞳辊,这种坚硬的固体划伤了铸坯表面。     

Pullout behavior of a bearing polymeric strap under monotonic and cyclic tensile loads

Soil-reinforcement interaction consists of three factors including frictional resistance, shear strength of the soil and passive resistance. In the ordinary polymeric strap (PS) reinforcement, only frictional resistance contributes to pullout resistance. In this study, in order to develop passive resistance in the soil, a number of angles as transversal elements were attached to PS reinforcement, which is called bearing polymeric strap (BPS). The post-cyclic pullout behaviour of the BPS is evaluated using a large-scale pullout apparatus adopting multistage pullout (MSP) test and one-stage pullout (OSP) test procedures. The results show that a spacing-to-high ratio of angles equal to 3.33 gives the maximum pullout resistance. MSP tests were performed on the BPS with an optimum arrangement to evaluate the influence of various factors including cyclic tensile load amplitude, load frequency and number of load cycles, and also the influence of vertical effective stress on the pullout resistance and the peak apparent coefficient of friction mobilized at the soil-BPS interface. Moreover, for BPS system with a single isolated transverse member, the bearing capacity factor N_q was calculated using equations based on three failure modes and it was found that the N_q calculated in the punching shear failure mode makes the best prediction.     

一种便携输电分相接地线的胸背带的设制

为满足输电线路停电检修时向杆塔上运送挂设分相接地线的新需求,利用力学原理、采用纵横双向承力法及“以人为核心”的技术设计思想,设计研制出一种与人身全面紧密接触、“融”为一体的携带分相接地线的胸背带.该胸背带是对向输电线路杆塔上运挂分相接地线传统工具的重大创新,已在新乡供电区应用.本成果对规范、高效进行输电线路分相接地线挂...