基于ABAQUS液氨储罐管座角接头应力计算

液氨储罐排污门管座角接头由于制造中采用未开坡口单面焊结构,使用中出现开裂失效。采用有限元软件ABAQUS对3种类型的管座角接头进行了应力计算,并与实际开裂情况进行了比较。研究结果表明：开坡口全焊透的角接头筒体内壁所受应力最小,未开坡口双面焊角接头应力中等,未开坡口单面焊角接头开孔处简体内壁所受应力最大,与液氨储罐排污门管座角接头开裂情况一致。在重要场合要避免使用未开坡口的单面焊接的管座角接头结构。     

摩托车催化转化器性能台架评价方法研究

台架评价试验在摩托车催化转化器性能评价体系中起重要的作用，但国内摩托车催化转化器性能台架评价目前尚属空白。在借鉴国内外汽车催化转化器台架评价试验方法的基础上，建立了摩托车催化转化器性能台架评价试验装置，并进行了催化转化器空燃比特性、空速特性、温度特性、起燃时间特性试验。     

发动机台架试验的模糊PID控制器的研究与仿真

本文提出了一种应用于汽车发动机测试台架的模糊PID控制器,这种PID控制器优点在于PID参数可在线自整定。Matlab仿真结果表明这种利用模糊PID控制方案有着比常规PID控制方案更好的控制效果。     

大峡水电站大坝垂直位移监测的方法及其误差分析

水电站大坝主变形监测是判断大坝安全运行的重要依据之一，本文是在新技术、新仪器不断涌现的情况下，对大坝垂直位移监测的方法作以讨论，以便于参与大坝变形监测的设计和测量人员参考。     

降低通用小型汽油机燃油消耗率的研究

在通用小型汽油机的结构尺寸不作变动，其化油器的结构尺寸也不作大的变动的前提下，通过改变化油器主量孔的尺寸大小控制进油量，简单改变泡沫管燃油通道的结构尺寸对燃油进行增压，在泡沫管顶部采用燃油多孔喷射技术等措施，以达到降低通用小型汽油机燃油消耗率的目的。     

Modelling and analysis of the dynamic behavior of a forced circulation solar water heating system with storage tanks in series

A generalized model for a forced circulation solar water heating system with storage tanks in series is presented in which the loss of heat through an insulation lagging is considered, and the periodic time variation of the intensity of solar radiation, as well as both the ambient air temperature and the temperature of cold water entering the first main tank, is taken into account. Using the Laplace transformation, an exact solution is presented which, under certain conditions, reduces to an approximate solution. The conditions for convergence to the approximate solution are discussed, and figures are presented comparing it with the exact solution for several different sets of conditions. In this communication, the effect of the number of storage tanks on the outlet temperature of the hot water and the effect of various water heating system parameters on its performance have been analytically investigated. Numerical calculations have been made for a typical cold day.     

HQF谐振式曲轴疲劳试验机的设计

本文介绍了四主轴颈固紧的卧置谐振式曲轴疲劳试验机的原理、设计、构造及调试工作,适应X6130,斯泰尔,6120曲轴的疲劳试验台。通过试验台的调试工作,介绍了(?)的曲轴疲劳强度的计算方法。对6120的曲轴进行了疲劳试验台架考核。     

摩托车催化转化器性能台架考核装置改进

摩托车催化转化器性能台架考核方法,可以快速有效的评价催化器的性能。在本文中对原有的试验装置进行了改进。设计了电喷系统对空燃比进行调节,设计了换热器对催化器入口温度进行调节。试验结果证明改进后的装置可以提高空燃比和入口温度的控制精度,满足快速准确的评价催化器性能的要求。     

地震作用下储罐参数对其应力影响分析

考虑固液耦合以及储罐与地基的相互作用,运用ADINA有限元软件建立了三种不同体积储罐的有限元数值分析模型,设置不同的储液高度,分析储罐罐壁在水平地震作用下的应力响应,得到了相关结论。     

Seismic response of liquid-filled elevated tanks

The main focus of the current study is to evaluate the performance of elevated tanks under seismic loading. In this study, the finite element (FE) technique is used to investigate the seismic response of liquid-filled tanks. The fluid domain is modeled using displacement-based fluid elements. Both time history and modal analyses are performed on an elevated tank. Using the FE technique, impulsive and convective response components are obtained separately. Furthermore, the effect of tank wall flexibility and sloshing of the water free surface are accounted for in the FE analysis. In this study complexities associated with modeling of the conical shaped tanks are discussed. This study shows that the proposed finite element technique is capable of accounting for the fluid-structure interaction in liquid containing structures. Using this method, the study of liquid sloshing effects in tanks with complex geometries such as conical tanks is made possible. The results of this study show that the current practice predicts the response of elevated tanks with reasonable accuracy.