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1.
Genetic optimization algorithm of PID decoupling control for VAV air-conditioning system 总被引：1，自引：0，他引：1
Variable-air-volume (VAV) air-conditioning system is a multi-variable system and has multi coupling control loops. While all
of the control loops are working together, they interfere and influence each other. A multivariable decoupling PID controller
is designed for VAV air-conditioning system. Diagonal matrix decoupling method is employed to eliminate the coupling between
the loop of supply air temperature and that of thermal-space air temperature. The PID controller parameters are optimized
by means of an improved genetic algorithm in floating point representations to obtain better performance. The population in
the improved genetic algorithm mutates before crossover, which is helpful for the convergence. Additionally the micro mutation
algorithm is proposed and applied to improve the convergence during the later evolution. To search the best parameters, the
optimized parameters ranges should be amplified 10 times the initial ideal parameters. The simulation and experiment results
show that the decoupling control system is effective and feasible. The method can overcome the strong coupling feature of
the system and has shorter governing time and less over-shoot than non-optimization PID control. 相似文献
2.
方金湘 《岳阳职业技术学院学报》2008,23(2):65-67
风管制作安装质量问题会造成送风量不足、漏风量超过规范要求等问题,致使能源浪费、热源不足和空调通风工程运行不稳定等现象.本文从分析问题入手,结合广西柳州空调通风工程的实例,介绍风管的制作、安装技术及改进措施. 相似文献
3.
为了降低企业生产车间空调能耗,基于长短期记忆（LSTM）网络构建了一种工业空调启动时间预测模型。使用该模型对车间空调提前启动时间进行预测,并将预测结果应用于车间空调系统的启动控制,以达到节能目的;采用平均绝对百分误差（MAPE）对预测模型进行整体误差评估,实验结果表明：LSTM 较好地解决了生产车间空调系统启动时间预测问题,相较于传统预测方法有着更小的 MAPE。优化控制后的空调系统能够在保证车间生产环境达标的同时,降低空调系统约 27.9%的能耗。 相似文献
4.
针对直流变频自由拖5 HP外机进行实验,以四台低静压风管机室内机为实验对象,在各种恶劣工况条件下研究润滑油变化时,系统应采取何种相应控制手段,并从系统控制方面进行精细的设计,确保直流变频压缩机润滑油的可靠性。 相似文献
5.
选取四川盆地19个地面气象站1961～2000年气温（平均气温、最高气温和最低气温）的逐日观测资料,运用最小二乘法计算气候倾向率和年代际变化的方法,对近40年来四川盆地气温的季节、年际和年代际变化进行了诊断分析,结果表明：（1）从年平均气温来看,三种气温的年平均值,四川盆地都以增温的趋势为主,增幅分别是0.027℃/10a、0.007℃/10a和0.036℃/10a,最低气温增幅大于最高气温.（2）在20世纪60、70年代气温逐渐降低,80年代是气温的低值区,80年代后期气温逐渐升高,90年代升温明显;而降水60、70年代降水量较多,但已经出现了逐渐减少的变化趋势,80年代至90年代降水量减少.（3）从季平均气温来看,春夏季三种气温呈下降趋势,其中季平均气温的下降幅度最大为-0.08℃/10a;秋冬季三种气温呈上升趋势,其中季平均最高气温的增幅最大为0.15℃/10a. 相似文献
6.
针对空调系统中的不同故障,分析了空调箱的故障特性,并讨论了不同故障对空调系统能耗及热舒适性的影响.仿真试验结果表明,送风温度的测量故障会导致系统能耗的增加.根据故障特性,提出了一种基于神经网络的数据处理方法,用以检测和诊断空调箱中的传感器故障.该方法首先选取历史数据对神经网络进行训练,实现对系统运行状态的识别和预测.然后,通过比较测量值与预测值,计算出相对误差,实现对故障的诊断.最后,利用基于TRNSYS的仿真器,对神经网络的故障诊断策略进行了验证.结果表明,神经网络可以有效诊断空调系统中的温度、流量和压力传感器故障. 相似文献
7.
陈应生 《深圳职业技术学院学报》2006,5(1):22-24
对“通风与空调工程施工质量验收规范”漏风量测试实施过程中如何界定低、中、高压风道系统的问题进行了分析;针对“规范”推荐的测试办法在工程实践中面临的困难,提出了一种漏风量测试的新方法,该方法在东莞玉兰大剧院空调工程中实际应用效果良好。 相似文献
8.
实验室利用差压传感器测量空气相对压力系数时,真空泵的抽真空度对于实验结果有很大的影响。实验采用控制变量法,对真空泵抽真空度这一影响因素进行了研究。结果表明,真空泵抽真空程度越高,测量所得空气相对压力系数值越小,并且越接近其真实值,空气相对压力系数测量值的改变量随真空度的增大而不断减小,二者之间呈现出一条斜率渐渐减小的曲线关系。真空泵无法完全抽真空时,可以通过将最终测得的空气相对压力系数值乘以其对应真空度值的方法对实验结果进行修正。 相似文献
9.
Aiming at the problem of air-cooled condenser output limit,a spray humidification system was presented to reduce the inlet air temperature.The pressure atomizing nozzle TF8 was chosen for inlet air spr... 相似文献
10.
以少量胸导管淋巴液和肠淋巴液给予补液干予治疗的重症失血性休克大鼠,用生理盐水做对照,观察其对血压及存活时间的影响,以探讨不同部位淋巴液维持血压的共同特性。结果表明:胸导管淋巴液及肠淋巴液回升血压及延长存活时间作用均显著优于对照组(P<0.05～0.01),而两个治疗组间未见统计学差异(P>0.05)。结果提示:胸导管淋巴液和肠淋巴液对失血性休克大鼠均有较好的抗休克作用。 相似文献
11.
以变频器为主控单元组成的家用中央变频空调调速系统,不仅能改变空调的运行状态、调节环境温度、使人感觉更加舒适,而且还有很好的节能效果和重要的经济价值。介绍了MICROMASTER 420变频器在空调系统上应用的具体设计过程和方法。 相似文献
12.
刘莉宏 《北京工业职业技术学院学报》2013,12(4):20-26
针对热风回流焊机温度模糊-PID复合控制系统中的模糊控制器进行了较为详细的设计,并利用MATLAB对模糊控制、PID控制和模糊-PID复合控制3种控制系统进行了仿真实验.比较结果表明：热风回流焊机温度控制系统采用模糊-PID复合控制方式,不仅比单独的模糊控制方式具有更高的稳态性能,而且比单独的PID控制方式具有更好的动态性能. 相似文献
13.
INTRODUCTIONWindenergyofabout2.531011Wavailableeverywhere,especiallyincoastalregions,deserts,grasslandsandcountrysideareasinChina,ispol-lutionfreeandrenewable(Xueetal.,2001).Useofwindenergycanimprovethelivingandworkingconditionsofpeople.Themanyelectricitygen-eratorsdrivenbywindpowerallovertheworldefficientlyextractwindenergyforconversionintoelectricalenergy.Manyregions,suchascountry-sideandruralareashavehighdensityofwindpower,buttheconditionsarenotgoodenoughforestablishingahighelectricpo… 相似文献
14.
Wind energy is a pollution free and renewable resource widely distributed over China. Aimed at protecting the environment and enlarging application of wind energy, a new approach to application of wind energy by using compressed air power to some extent instead of electricity put forward. This includes: explaining the working principles and characteristics of the wind energy-compressed air power system; discussing the compatibility of wind energy and compressor capacity; presenting the theoretical model and computational simulation of the system. The obtained compressor capacity vs wind power relationship in certain wind velocity range can be helpful in the designing of the wind power-compressed air system. Results of investigations on the application of high-pressure compressed air for pressure reduction led to conclusion that pressure reduction with expander is better than the throttle regulator in energy saving. 相似文献
15.
高精度恒温恒湿空调系统应用于对环境有严格控制的地方,而数码涡旋压缩机技术具有无极能量调节、室内温度控制更准确的特点．将数码涡旋压缩机技术应用于高精度恒温恒湿空调系统,实现该空调系统在超低温度和湿度条件下的高精度恒温恒湿控制,达到温度±0．5℃和相对湿度±1％的精度要求。 相似文献
16.
详细阐述了用欧姆龙公司的可编程序控制器、可编程序终端及温度传感器单元组成的地温中央空调控制系统的控制原理、控制方法。 相似文献
17.
YAO Fang ZHENG Jian-rong HUANG Zhang-wu 《浙江大学学报(A卷英文版)》2007,8(3):485-489
The dynamic contact resistances of HH52P electromagnetic relays are measured under different ambient air tem- perature. Their diagnostic parameters are extracted and determined. It is found that the ambient air temperature obviously influ- ences some parameters. In order to research its influence on the electrical contact reliability of electromagnetic relay, the statistic analysis is applied to study the static contact resistance, the max of the dynamic contact resistance and the bounce time. It is found that the ambient air temperature regularly influences the three parameters. Thoroughly, the phenomenon is studied and analyzed in the point of material science so as to probe into the essential matter of it. 相似文献
18.
YANG Ying TONG Mingwei WU Zhijuan College of Power Engineering Chongqing University Chongqing P. R. China 《重庆大学学报(英文版)》2004,3(1):6-10
1.IntroductionTherequirementsforenvironmentalprotectionaregettingstricterworldwide.Notonlythenaturalecologyandresourcesshouldbeconsideredinconservation,butalsotheenvironmentbeprotectedfrombeingsacrificedastheexpenseofproductivityboosts.Aconventionalmachiningprocessusedtotakeoilasthelubricantandcoolantforthesurfacesofmachinedtoolsandworkpieces,whichbroughtforthenvironmentpollution,andincreasedcostsonpost-treatingoftools,workpiecesandcuttingscrap.Asaresult,greenmachiningtechnologyfeaturingcleanp… 相似文献
19.
INTRODUCTION Chlorophenols (CPs) are chemicals widely used in industry to manufacture insecticides, herbicides, fungicides, biocides, and dye, are also found in the effluent of the pulp and paper mill industry, and are mainly man-made compounds, and have been recog-nized as organic pollutants of air, groundwater, soil and sediments. They are carcinogenic and stable in water. Most chlorophenols are listed as priority pol-lutants by the US Environmental Protection Agency (1988) due to th… 相似文献
20.
陈希 《重庆大学学报(英文版)》2005,4(2):113-116
1 Introduction1 The principle controlled target of an end-port glass tank furnace regenerator is the melting temperature which is regulated by the flow of oil or gas. The disturbances stem from feed-in glass powder, the pressure, value and atomization of fuel, the secondary wind, the tank furnace pressure, etc. Among them, some can be controlled and some cannot. In order to keep the temperature steady, a cascade ratio regulating system is designed, in which the temperature adjustment functions… 相似文献