千吨级起重机用多排滚子组合转盘轴承快拆装结构的承载能力分析

针对千吨级起重机所用快拆装多排圆柱滚子轴承的快拆装结构设计以及销轴选型,无法校核计算保证快拆装结构的安全使用,防止销轴损坏造成千吨级起重机在吊装作业时出现事故。本文主要介绍多排圆柱滚子轴承的快拆装结构的校核计算方法,利用所建立的校核方法计算得出了销轴、底座以及支撑圈的结构强度安全系数,为判定多排圆柱滚子轴承的快拆装结构满足给定应用工况要求的程度提供了依据,以供生产制造厂家参考。

Analysis of asphalt pavement structural response from an accelerated loading test

This study was to compare theoretical calculation and practical measurement structure response of asphalt pavement. Analysis of the pavement layer moduli was determined from a Back-calculation of Falling Weight Deflectometer (FWD) data and the measured stiffness moduli of asphalt layer cores. The pavement response was calculated using a theoretical model and the measured strain response at the bottom different layers. Layered elastic theory was used to back-calculate the layer moduli and three different theory models were used to forward calculate the strain and deflection. The models were: Layered Elastic Theory (LET), the Method of Equivalent Thicknesses (MET) with linear elastic and the Finite Element Method (FEM) where asphalt layer may be viscoelastic. The results showed that the calculation structure response from FEM was consistent with measured results.

艺术设计领域应用染色木基复合材料的尝试与创新

文章本着艺术与科学结合发展、相互促进的原则,比较系统地阐述了在以室内装饰和家具设计为主的艺术设计领域对染色木基复合材料开展的创新应用研究。文中简述了该材料的主要特点,并介绍了基于其特点设计出的快装自锁榫卯结构、剔犀式线刻浮雕、套色浮雕等设计创意。