共查询到20条相似文献，搜索用时 406 毫秒
1.
Carburization is a complex manufacturing process with serious disturbance and time delay,which is multi-variable and uncertain.It is difficult to set up an exact mathematic model.Moreover,by means of conventional control methods and experience,satisfying control result can't be obtained.In this paper,according to the characteristic of controlled-object,Fuzzy control method has been chosen to design a Fuzzy-PI controller and a mixed-PID Fuzzy controller.The result of simulation shows that the robust performance and control result of the new Fuzzy controllers is better than the conventional PID controller.The overshoot is smaller.It is helpful to improve the quality of carburizing workpieces. 相似文献
2.
Fuzzy controller can achieve satisfactory dynamic performance even for complicated process without mathematical model of the process.Its main imperfection is the existence of steady state error and ultimate oscillatory in the process output. This limits its application area. How to eliminate the steady state error while keep its good dynamic performance has been paid much attention. The strategy to introduce integral function to the conventional fuzzy control system is put forward in this paper to overcome the above problem. After expound two key factors on introducing integral action,an intelligent integral algorithm has been employed,and two methods on introduction of the intelligent integral to the fuzzy control system are proposed. Their characteristics and applied situations are summarized. 相似文献
3.
This paper deals with the adjustment of broom's speed of the sweeper. The Fuzzy control theory was utilized to study and design of the Fuzzy Controller. 相似文献
4.
This paper introduces the development of the electronic throttle control system (ETCS) , the structure and the principle of the system are also involved. After analyzing the nonlinearity problem existing in the mechanical structure of the system, a mathematical model of the ETCS is built up. Then three controllers (PID controller, Fuzzy controller, sliding mode controller) were designed and simulated in the matlab simulink. The result indicates that the PID controller has an overshoot,but the Fuzzy controller and the sliding mode controller can settle the nonlinearity problem better. 相似文献
5.
FENG Wei-min~ 《保鲜与加工》2005,(5):123-128
In this paper the theory of Fuzzy Mathematics is used to set up the case-based reasoning(CBR) mathematic model system on the price-estimation of the land-rental and the related process and conditions of its application are suggested.The calculation example of CBR in land business demonstrates that the CBR model is effective;it can be used as the reference for the decision-making on estimating the price in land business. 相似文献
6.
Based on the control mode and characteristics of engine of vehicle equipped with AMT, the control goals of engine revolution speed of starting control and shift control were proposed. Automatic control of engine revolution speed was implemented through equipping a electronic throttle in terms of mechanic throttle. Fuzzy controller of engine revolution speed was developed and implemented in the AMT control system. Good performance of the electronic throttle was shown by the rig test data. The control requirements of engine revolution speed were satisfied well by the fuzzy controller. 相似文献
7.
WU Kui~ LI Run-fang~ JIANG Wei~ity Chingqing Chin . Chongqing Institute of Petroleum Chingqing Chin 《保鲜与加工》2004,(5):17
The computer monitor and control system for hydropower station is always a structure system of laminate distribution and open style. The system can adjudge active power and inactive power of water turbine according to the requirement. The operators in active-control level give the value of active power and inactive power for water turbine by computer workstation. PLC of LCU run the power control procedure by net communication in order to realize power adjust. The power adjust of water turbine mainly by speed control system and magnetization system. The 2-D Fuzzy PID Control Model is proposed in order to carry out power adjust of water turbine . In this new method the parameter of PID can self-neaten on line according to power deviation and power deviation rate. By means of this procedure the machine unit can obtain given power value rapidly, exactly and stably. It can make the power adjust of monitor and control system obtain good control characteristic and robust, and it is benefit to extend the work life of machine unit. 相似文献
8.
Fuzzy c-means (FCM) algorithm is dynamic cluster algorithm whose result often is local optimal decision. There often exists insignificant clustering in the result of Fuzzy c-means algorithm when traditional union, Intersection and inclusion work in fuzzy set. Our research indicates there are no insignificant clustering in the result of Fuzzy c-means algorithm over genetic algorithm and partial optimal solution can be avoided with this algorithm to a certain extent. The coding, select, corresponding crossover and mutation operators are designed. Finally we compared the performance of GFCM and FCM with testing data. Results show that the performance of GFCM is far better than FCM. 相似文献
9.
The effect of damping on vibration is analyzed during the suspension deformation based on the 1/4 vehicle model. The Fuzzy logic control strategy for the semi-active suspension was proposed. By means of dissipating the energy of vibration and decreasing the peak value of the body acceleration via the action of damping, the parameter-self-adjust fuzzy controller was established. The united simulation of ADAMS and Matlab/Simulink were used for demonstrating the efficiency of the controller. Comparing with the practical passive suspension possessing the nonlinear character and the present fuzzy controller, the control system based on the new-style strategy provides better ride comfort and road handling. 相似文献
10.
Fuzzy control strategy is used to study the fuel economy of ISG-Type hybrid electric vehicle with CVT.Based on the instantaneous state of vehicle,the fuzzy logic controller is built aiming to get minimum fuel consumption.In order to avoid the subjective factor,the control rules are established with the optimized results from the sequence quadratic programming(SQP) method.Through the second development of ADVISOR,the simulation for ISG hybrid electric vehicle at different cycles has been accomplished.The results show that the fuzzy logic control strategy is efficient in improving the fuel economy of hybrid electric vehicle. 相似文献
11.
12.
Improvement of Fuzzy Comprehensive Evaluation Method 总被引：1，自引：0，他引：1
Fuzzy comprehensive evaluation is an effective method to evaluate many comprehensive problems and is widely used in environmental engineering, mining engineering and so on. The popular fuzzy comprehensive evaluation method is analyzed and some irrationality is found in its max-min algorithm and maximal subordinate degree principle. An altered arithmetic is proposed, and a technique of synthetic grade is introduced as the final evaluating result. The application case proves that the evaluating result with new method is more reliable. 相似文献
13.
The sintering parameters, such as sinter trolley speed, stuff thickness and ignition temperature etc. have important influence on sinter section image character distribution, and the sinter chemical ingredient have complicated nolinear relation with sintering section image characters. The paper applied Mixed-F statistic analysis to determine the optimal class number of Fuzzy cluster of sintering section radiant image, and fuzzy partition entropy analysis to verify whether the class number is optimal. It is be proved that the algorithm is right and effective, and its application is helpful for the online forecasting sintering FeO range. 相似文献
14.
Fuzzy PID controller was applied in variable air volume system. The task was to control the temperature of supply air and the temperature of air conditioned room (the return air temperature) close to their respective targets. The fuzzy PID control system of supply air temperature and return air temperature was designed respectively. The supply air temperature was controlled through adjusting the valve opening of chilled water. And the indoor temperature was controlled through adjusting the rotational speed of variable frequency ventilator. The supply air temperature and the indoor temperature (return air temperature) were controlled online by fuzzy PID controller. Thus, it was shown that the design of fuzzy PID controller was reasonable and the effect of fuzzy PID control was well. 相似文献
15.
模糊概率在棉花品种综合评价中的应用初探 总被引：10，自引：0，他引：10
本文运用模糊数学中隶属度和模糊概率的概念及计算公式,提出了棉花品种综合评价的模糊概率值法,并说明了方法的原理和使用步骤。为了验证该法的有效性,综合评价了1984年黄河流域棉花品种区试的各参试品种。结果表明,模糊概率值法与文献[2]中的多级模糊综合评定法采用同一资料得出的结果完全一致,但本法比文献[2]大大简化了计 相似文献
16.
Nie Duan Yang Xiutai 《保鲜与加工》1993,(4):11-15
Fuzzy decision was applied to the generation expansion planning and a method of fuzzy decision of generation expansion planning has been presented in this paper. 相似文献
17.
The FCBP(Fuzzy calculating BP) algorithm which is proposed by this paper hasovercome the sensitivity for samples,reduced the number of input layer's samples,lightened the burden of input layer.it is suitable to fuzzy inference and pattern recognition. 相似文献
18.
In this paper,a new quantitative model for quoted price and decision-making on project has been built by means of Operations of Fuzzy Relations and a fuzzy set theory.The established model has many characters,such as multi-objective for bidding,combined subjective opinion with enlightened logic as well as low leanness on data on past project and competitor.There is a case at the end of this paper showing the whole idea and process of the model.This paper provided a new theory base for the contractors in China. 相似文献
19.
A Comparison of Four Methods of Water Quality Assessment 总被引：2，自引：0，他引：2
In this paper, a back propagation network, a Hopfield network, Fuzzy comprehensive index method and classification of gray are compared in application for water quality assessment. The comparison result shows that the BP network is the best one of these four methods. 相似文献
20.
《保鲜与加工》2003,(10):97-100
It is very difficult to simulate the motion process of drill by accurate mathematics model for the complexity and invisibility of stratum. The fault of drill is usually identified and disposed by personal experience so far. This means it can not estimate the trend of the equipment running good or not and the reason conduced the fault or location and degree of fault by data measured. Farther, it can not give the expert suggestions. Based on the studying of drill fault, artificial intelligence and expert system have been used in the petroleum drilling engineering, the theory and method of fault diagnosis intelligence system for drill have been studied. It also constitutes the expert knowledge database of graphic Fuzzy Neural Network for the familiar fault of drill. The intelligence reasoning machine which consists of expert rule, Fuzzy logic and artificial Neural Network have been bring forward. And the fault diagnosis system it makes for drill can be applied in complex system which includes multi-variable, multi-parameter and multi-process. 相似文献