门座式起重机门腿变形不均匀时的塔身倾角计算

建立了门座式起重机门座的空间力学模型，分析了由于荷载作用位置的非对称性造成门腿变形的非均匀性从而引起的门座顶平面及塔身的倾斜，并给出了此倾角的计算方法及计算公式。这将为门座式起重机的合理、精确设计，提供有益的参考。     

安钢2800中厚板轧机安装中的摊题及其解决方法的探讨

针对安钢2800mm中厚板轧机机架安装中所遇到的几个难题,从理论和实践分析,并提出解决的方法。     

Automobile seat comfort prediction: statistical model vs. artificial neural network

The current automobile seat comfort development process, which is executed in a trial and error fashion, is expensive and outdated. The prevailing thought is that process improvements are contingent upon the implementation of empirical/prediction models. In this context, seat-interface pressure measures, anthropometric characteristics, demographic information, and perceptions of seat appearance were related to an overall comfort index (which was a single score derived from a previously published 10-item survey with demonstrated levels of reliability and validity) using two distinct modeling approaches-stepwise, linear regression and artificial neural network. The purpose of this paper was to compare and contrast the resulting models. While both models could be used to adequately predict subjective perceptions of comfort, the neural network was deemed superior because it produced higher r2 values (0.832 vs. 0.713) and lower average error values (1.192 vs. 1.779).     

基于单片机MC68HC908的座椅后视镜电控系统的设计

本设计以MC68HC908单片机作为控制器,分别控制继电器和桥式电路驱动电机运动,从而控制汽车座椅和后视镜的运动,达到电动调节座椅和后视镜的目的。本文重点介绍了座椅以及后视镜电动系统的工作原理并给出了相关电路的设计。     

浅谈管座角焊缝的超声波探伤

本文主要介绍了压煮器管座角焊缝的超声波探伤中，应选用的探伤工艺、探伤方法和步骤，通过对探伤波形的分析，来进行缺陷的判断，以保证压煮器管座角焊缝的质量。     

某型轰炸机座椅振动舒适性分析

基于IS02631及GJB966-90标准评价舒适度方法,建立了飞机-座椅-人体振动舒适度模型,用于飞机座椅舒适度评价.在此基础上,对比了飞机地面滑行阶段与空中飞行阶段振动能量分布频率段,分析了空中飞行阶段低频振动来源.利用信号仿真,通过改进伞包刚度和阻尼系数,大幅减少传递给人体的高频振动和相应低频振动能量.飞行实测数据计算结果表明,该轰炸机飞行员驾驶舒适性有待进一步提高.     

潜水电机耐高压机座铸件的铸造工艺

从化学成分，铸件结构，造型材料等几个方面探讨了潜水电机耐高压机座的铸造工艺。     

Modelling and simulation of a fore-and-aft driver''s seat suspension system with road excitation

This paper describes a simplified simulation of two configurations of the fore-and-aft seat suspension system. A fore-and-aft suspension system model was proposed based on the laboratory measurements of the seat vibration isolation performance. Friction was identified as an important parameter, so different approaches to simulating the suspension friction were investigated. Predicted seat vibration mitigation properties were compared with those measured in the laboratory in response to the recordings of the fore-and-aft vibration measured at the base of the driver's seat in an on-road tractor–trailer combination (articulated truck). Optimisation of the suspension elements parameters was then performed to identify the maximum attainable attenuation. A solution incorporating supercritical suspension damping predicted to give an improvement of the order of 10% in the x-direction mitigation properties as compared to a fixed (locked) horizontal suspension system.

Relevance to the industry

Simulations conducted in this study are of use to seat manufacturers in developing the fore-and-aft seat suspension systems with improved vibration mitigation properties and for predicting its dynamic performance. The optimisation study shows the attainable vibration mitigation limits for a horizontal suspension system.     

乙烯装置分离顺序选择及前脱丙烷技术

简要介绍了分离次序的考虑原则。分析了3种前脱丙烷技术-Stone＆Webster公司的ARS技术、KBR公司的ALCET和中石化的LECT技术特点，并对它们的优缺点进行了对比说明。     

某剧场室内热环境CFD模拟分析

空调系统形式对于高大空间剧场的室内环境具有决定性影响,为验证空调系统形式的合理性,在设计阶段采用模型实验是不现实的,而CFD模拟是一种成本低、速度快、资料完备的有效方法;采用计算流体力学模拟软件STARCD对某剧场夏季和冬季室内热环境进行模拟,根据模拟结果,分析了空调系统设计方案的合理性,并提出改进建议。