浅谈公路施工现场危险源辩识及控制管理

就公路施工现场如何对危险源进行辩识做了比较深入地分析与探讨,提出了控制管理的措施,以防止和减少施工生产安全事故的发生。     

蓄电池测试系统中SVPWM与SPWM的比较研究

针对高性能蓄电池测试系统主变流电路采用的SVPWM和SPWM调制方法，分析了二者间的内在联系，并进行了性能比较。在数字化控制系统中，较SPWM方案，SVPWM方案不仅提高了逆变器的直流电流利用率，且减小了输出电流的纹波系数，降低了谐波污染，使电路更接近单位功率因数运行。     

电动燃油泵换向器磨损原因分析和解决方案

由于乙醇汽油的应用，电动燃油泵的铜换向器磨损加速，严重影响了该产品的寿命，本文对磨损加速的原因进行分析，并提出解决方案。     

Simulation study on the operating characteristics of a hybrid hydraulic passenger car with a power split transmission

In this paper, a hybrid hydraulic passenger car (HHPC) coupled with a power split continuously variable transmission (P-CVT) is proposed. This P-CVT is capable of splitting the power from the internal combustion engine into mechanical and hydraulic power flows. By adjusting the ratio of the mechanical power to hydraulic power, the P-CVT enables the transmission ratio to be changed continuously. Meanwhile, the P-CVT system can capture the braking energy and store it in the hydraulic accumulator for the next assistant driving. In order to quantitatively investigate the effect of applying P-CVT on improving the fuel economy and operating performance for the HHPC, a numerical simulation is conducted under typical city driving conditions. The simulation results demonstrate that, the P-CVT permits the engine to be run under a more efficient operating range. The total fuel consumption of the HHPC is reduced by 16.4% under the test conditions, compared with that of the original car.     

舞台车液压系统双动力源装置设计

介绍了一种舞台车液压系统双动力源结构，其在原液压系统动力源装置的基础上，通过加装一套油泵、电动机、电控箱及部分管路、电缆线等实现增加一套动力源结构，采用该装置可减少油耗，延长发动机及变速器使用寿命，减少维修保养费用，具有节能、环保等优点。     

Experimental study of the airside performance for interrupted fin-and-tube heat exchanger with hydrophilic coating under dehumidifying conditions

The airside heat transfer and friction characteristics of seven interrupted fin-and-tube heat exchangers with hydrophilic coating under dehumidifying conditions are experimented. The effects of number of tube rows, fin pitch and inlet relative humidity on airside performance are analyzed. The test results show that the influence of fin pitch on the friction characteristic under dehumidifying conditions is similar to that under dry surface, and the friction factors decrease slightly with the increase of number of tube rows. The heat transfer performance decreases as fin pitch and number of tube rows increases. The heat transfer performance and the friction characteristic are independent of inlet relative humidity. Based on the test results, heat transfer and friction correlations in terms of the Colburn j factor and Fanning f factor, are proposed to describe the airside performance of the interrupted fin geometry with hydrophilic coating under dehumidifying conditions. The correlation of the Colburn j factor gives a mean deviation of 9.7%, while the correlation of the Fanning f factor shows a mean deviation of 7.3%.     

船用柴油机燃料热量利用系数的计算与应用

本文给出了燃料热量利用系数的计算式。应用该系数,可以评估燃料热量的利用率,可以计算循环热效率,以及估算循环的散热量和排气的放热量。从而对循环进行热分析。     

基于鳍片式热电模组的船舶柴油机废气余热利用及其影响因素分析

摘 要：设计了一种鳍片式热电转换模组,并将其应用在船舶柴油机废气余热回收系统中,通过理论和实验,分析鳍片式热电转换系统的影响因素。结果表明：当柴油机负荷为75%,热电晶片总数为1428,排气温度550K 时,设计的鳍片式热电模组发电功率为6.72kW,热电转换效率可达5.42%。排气温度、冷却水温度以及柴油机负荷都会影响热电转换系统性能。随着柴油机负荷的提高,热电转换系统发电功率和转换效率也随之增大,但负荷在75%之前增大的幅度大于从75%~100%的负荷。热电模组鳍片数量会影响转换系统的热端温度和传热量,在条件允许范围内,可通过增加鳍片数目,提高废热回收效率。     

某深水半潜式生产平台压载系统配置研究

通过研究某型深水半潜式生产平台压载系统,分析泵舱压载泵和深井压载泵的适用条件,为其他深水半潜式生产平台压载系统的配置设计提供一定参考。通过对半潜式生产平台压载系统的设计理念及相关规范进行调研,掌握了深水半潜式生产平台压载系统的设计方法,总结不同压载泵形式的特点,并基于该深水半潜式生产平台特点提出适用的压载泵选型方案。     

大型绞吸挖泥船泥泵封水系统配置分析

为适应大型绞吸挖泥船泥泵系统长排距、高扬程的需求,多泥泵串联运行的应用使泥泵封水系统的压力越来越高,泥泵运行在不同工况时对封水系统的要求也不尽相同。文章以7800kW绞刀功率自航绞吸挖泥船为研究对象,分析其泥泵封水系统的配置及设计方案,以保障泥泵的安全有效运行。