Weber’s law based multi-level convolution correlation features for image retrieval

Multimedia Tools and Applications - Weber’s law reveals the relationship between human perception and perceptual stimuli. Inspired by the theory, this paper designs a multi-level convolution...     

非周期性亚稳态信号--分析产生原因及测试方案

通过对非周期性亚稳态信号的产生原因的分析,利用先进的仪表对其进行测试,从而便于更好的改进电路设计.     

某轻型卡车驾驶室地板强度分析研究与改进

以某轻型商用卡车驾驶室地板频繁发生开裂故障为背景,对该品牌商用车驾驶室地板强度进行故障原因分析及优化设计.首先对轻卡地板驾驶室进行CAE建模与仿真,使用电测法测得该轻型商用卡车道路行驶过程中各个测点的应变时域数据.计算结果表明,CAE计算仿真结果应力极值达160.7 MPa,电测法测得相同部位的应力极值达250.3 MPa,都远超驾驶室材料屈服强度极限.然后在此基础上判别问题性质,对翻转机构进行受力分析和计算,计算结果显示两侧扭矩极限理论差值仅为3424.2 N·m,判断开裂原因为驾驶室本体强度过低.最终在试验及理论分析的基础上,提出增加加强板及焊缝和增加结构胶两种结构强度优化措施,并进行多方面对比分析,为后续工程结构优化与强度分析提供参考依据.     

JKQ-25与MK-A25.5矿用自卸卡车优劣分析

针对目前金川二矿井下使用的矿用自卸卡车进行比较分析,提出JKQ-25矿用自卸卡车的优点和缺点,并提出改进建议。     

Equilibrium scour depth at offshore monopile foundation in combined waves and current

Unlike the pier scour in bridge waterways,the local scour at offshore monopile foundations should take into account the effect of wave-current combination.Under the condition of wave-current coexistence,the water-soil interfacial scouring is usually coupled with the pore-pressure dynamics inside of the seabed.The aforementioned wave/current-pile-soil coupling process was physically modeled with a specially designed flow-structure-soil interaction flume.Experimental results indicate that superimposing a current onto the waves obviously changes the pore-pressure and the flow velocity at the bed around the pile.The concomitance of horseshoe vortex and local scour hole around a monopile proves that the horseshoe vortex is one of the main controlling mechanisms for scouring development under the combined waves and current.Based on similarity analyses,an average-velocity based Froude number(Fra)is proposed to correlate with the equilibrium scour depth(S/D)at offshore monopile foundation in the combined waves and current.An empirical expression for the correlation between S/D and Fra is given for predicting equilibrium scour depth,which may provide a guide for offshore engineering practice.     

电磁兼容测试技术

本文简要介绍了电磁兼容EMI的测试方法和电磁干扰的防范措施。     

安钢6#高炉热风炉的改造

介绍了安铜炼铁厂6#高炉热风炉中修中的一些技术改造。通过合理的改造,热风温度有了明显的提高,炉子寿命大大延长,取得了良好的效果。