某型飞机燃油泵试验台的设计

文章介绍了某型飞机燃油系统燃油泵试验台设计思想和工作原理。并利用PLC和触摸屏技术设计了该装置的控制系统。实际运行测试表明，该装置达到了功能要求，控制系统运行良好。     

某型飞机燃油系统流阻试验台的设计

该文介绍了某型飞机燃油系统流阻试验台设计思想和工作原理。并利用PLC、变频器和触摸屏技术设计了该装置的控制系统。实际运行测试表明，该装置达到了功能要求，控制系统运行良好。     

基于PLC控制的飞机燃油流阻试验台的设计

首先简要介绍了某型飞机燃油系统流阻试验台的工作原理,在此基础上,利用PLC、变频器和触摸屏技术设计了该装置的控制系统,着重阐述了系统的硬件、软件设计及抗干扰措施.结果表明本控制系统设计合理,达到了预期的设计目标.     

加油控制阀与液面控制器测试系统的设计

该文介绍了某型飞机加输油控制阀测试系统的工作原理、功能和特点,并利用PLC、变频器和触摸屏技术设计了该装置的控制系统.最后,通过实验,验证了系统的可行陛和实用性.     

基于PLC的锅炉清灰装置自动控制系统设计

针对垃圾发电厂传统的机械振打清灰装置,介绍了一套新型的清灰装置.根据垃圾发电厂的具体要求,采用工控机作为上位机,PLC为下位机,设计了一套锅炉清灰装置自动控制系统.详细介绍了系统硬件的配置及功能,并设计了相应的程序梯形图与操作监控界面.经过电厂应用,验证了控制系统的可靠性与稳定性,为电厂节约了经济成本,提高了清灰振打的效率,取得了很好的应用效果.     

加输油控制阀测试系统的设计

该文介绍了某型飞机加输油控制阀测试系统工作原理、功能和特点,并利用PLC、变频器和触摸屏技术设计了该装置的控制系统.最后,通过实验,验证了系统的可行性和实用性.     

基于模糊PID的直进式拉丝机控制系统设计

针对国内拉丝机设备出现的拉丝过程中张力不稳定、容易断丝的现象,本文设计了一种基于模糊PID算法的控制系统,该控制系统由PLC、触摸屏、变频器等主要电气部件组成.首先解决了前后道工序之间张力杆波动引起的断丝控制问题,其次采用模糊控制算法整定PID参数,解决了直进式拉丝机出现的经常变动PID参数的问题.该系统经试运行证明, 该控制系统运行良好,拉丝产量有显著的提高.     

飞机交流燃油泵测试台控制系统的设计

该文首先简要介绍了交流燃油泵测试台的总体结构和主要特点,在此基础上,利用PLC、伺服阀、比例阀和触摸屏技术设计了该装置的控制系统,着重阐述了控制系统的功能、组成和工作原理,给出了系统的硬件和软件的设计和实现方法。结果表明本控制系统设计合理,具有良好的动态品质和稳定性能,达到了预期的目的。     

基于PLC和触摸屏的高精度皮革压花机控制系统

介绍了一种新型的压花机高精度长度控制系统。该装置利用可编程控制器和触摸屏组成串行通信系统,将编码器采集到的数据在触摸屏中显示,利用伺服电机控制压花机运行长度,有效地降低了电机故障率,提高了企业的经济效益和竞争力。     

监控式模拟量速度闭环控制系统的设计与应用

主要针对带式输送机控制系统中被控对象模拟量速度的特点,提出采用硬件组态、网络组态和程序设计3方面结合的监控系统设计方案,实现触摸屏、变频器和PLC在模拟量速度闭环控制系统中的应用,使系统的自动控制功能大大加强。该系统具有硬件设计合理、软件功能完善、便于现场控制和操作维护、运行安全可靠等特点。     

A technique to measure fuel oil viscosity in a fuel power plant

The viscosity measurement and control of fuel oil in power plants is very important for a proper combustion. However, the conventional viscometers are only reliable for a short period of time. This paper proposes an on-line analytic viscosity evaluation based on energy balance applied to a piece of tube entering the fuel oil main heater and a new control strategy for temperature control. This analytic evaluation utilizes a set of temperature versus viscosity graphs were defined during years of analysis of fuel oil in Mexican power plants. Also the temperature set-point for the fuel oil main heater output is obtained by interpolating in the corresponding graph. Validation tests of the proposed analytic equations were carried out in the Tuxpan power plant in Veracruz, Mexico.     

Frictional charging of fuel

A method is proposed for reducing the smoke content and toxicity of exhaust gases by frictional charging of motor fuel. Experimental data are presented.     

Atomization of fuel mixtures

The combustion process of a coal/oil slurry begins by atomization of the slurry. This project is a presentation of experimental system and results on atomization of coal/oil(COM) and coal/methanol mixtures with a twin-fluid and a wheel atomizer. The slurries are consisted of coal/methanol and coal/oil mixtures with two different concentrations and two coal particile sizes. The volume median diameters of the coal particles were 45 and 130 microns. The oil was No. 2 diesel oil. The droplet size was determined by photographing the spray and the photographs were analyzed to determine droplet size and distribution. The results show that the inclusion of particles in the liquid(both methanol and diesel oil) does not appreciably affect the atomized droplet size. The tendency is for the slurry droplets to be somewhat smaller than the droplets atomized with the pure liquid.     

Calculation of fuel spray impingement and fuel film formation in an HSDI diesel engine

Spray impingement and fuel film formation models with cavitation have been developed and incorporated into the computational fluid dynamics code, STAR-CD. The spray/wall interaction process was modeled by considering the effects of surface temperature conditions and fuel film formation. The behavior of fuel droplets after impingement was divided into rebound, spread and splash using the Weber number and parameter $K(\sqrt {We\sqrt {Re} } )$ . The spray impingement model accounts for mass conservation, energy conservation, and heat transfer to the impinging droplets. The fuel film formation model was developed by integrating the continuity, momentum, and energy equations along the direction of fuel film thickness. Zero dimensional cavitation model was adopted in order to consider the cavitation phenomena and to give reasonable initial conditions for spray injection. Numerical simulations of spray tip penetration, spray impingement patterns, and the mass of film-state fuel matched well with the experimental data. The spray impingement and fuel film formation models have been applied to study spray/wall impingement in high-speed direct injection diesel engines.     

Seismic tests of fuel assemblies

Seismic tests of full-scale mockups of fuel assemblies from the VVER-1000 reactor permit the determination of the transfer characteristics between the stimulus (acceleration of the supports) and the response of the fuel assemblies. No resonant responses of the fuel assemblies to seismic loads are observed.     

Novel application-oriented transient fuel model of a port fuel injection S. I. engine

Most researches on transient fuel control of port fuel injection S.I. engine are carried out from the perspective of advanced mathematical theories. When it comes to practical control, there exist many limitations although they are more intelligent. In order to overcome the fuel wetting effect of PFI engine, the application-oriented transient fuel control is studied by analyzing the key parameters which are closely related with the engine transient characteristics. Both validity and simplicity are taken into consideration. Based on the fuel wall-wetting theory and popular fuel compensation strategy, short-term transient fuel（STF） and long-term transient fuel（LTF）, as well as their individual decay approaches, are introduced. STF is to compensate the drastic fuel film loss caused by sudden throttle change, while the function of LTF is to compensate the fuel film loss by manifold air pressure（p） fluctuation. Each of them has their respective pros and cons. The engine fuel mass and air mass are also calculated for air-fuel ratio（AFR） according to ideal gas state equation and empirical equations. The vehicle acceleration test is designed for model validation. The engine experiences several mild and heavy accelerations corresponding to the gear change during vehicle acceleration. STF and LTF control are triggered reliably. The engine transient fuel control simulation adopts the same inputs as the test to ensure consistency. The logged test data are used to check the model output. The results show that the maximum fuel pulse width（FPW） error reaches 2 ms, and it only occurs under engine heavy acceleration condition. The average FPW error is 0.57 ms. The results of simulation and test are close overall, which indicates the accuracy of steady and transient fuel. The proposed research provides an efficient approach not only suitable for practical engineering application, but also for AFR prediction, fuel consumption calculation, and further studies on emission control.     

Group vaporization of liquid fuel sprays

In the simplest models of spray combustion it is assumed that the droplets burn individually according to the “d²-law.” Both theory and experiment show that this model only will be valid if the spray is extremely dilute, otherwise the droplets burn collectively in what is known as the group combustion mode. Most of work on spherical droplet cloud is limited to monodisperse sprays; however it is important to determine how the particle size distribution will affect group combustion, particularly the sheath combustion mode. In order to gain preliminary indication of the effect of the droplet size distribution of the vaporization process, the behavior of spays with a bimodal droplet size distribution is examined. The present study shows that for a cloud which is initially in saturated equilibrium the droplet size distribution changes the profiles of temperature and fuel vapor mass fraction within the vaporization wave at the edge of the cloud; however, the size distribution does not affect the overall evaporation characteristics such as the vaporization rate and the cloud lifetime in the sheath combustion limit considered here. It is shown that as before the cloud radius decreases according to a “d²-law” with a modified vaporization constant.     

柱塞油泵可靠性设计

传统的柱塞油泵,柱塞付配油是利用柱塞回程弹簧,柱塞回程弹簧在长时间运行中容易疲劳而发生断裂,另一方面,因柱塞伸出长产生弯曲力矩过大导致缸体拉毛而断裂。介绍一种借鉴美国技术,采用齿轮泵给柱塞付配油的新结构,不但取消柱塞回程弹簧,还可以缩短柱塞伸出长度,减少柱塞弯曲力矩,避免柱塞回程弹簧断裂,减少柱塞的断裂,大大提高了柱塞油泵的可靠性。