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1、HYDRAULIC ACTIVE GUIDE ROLLER SYSTEM FOR HIGH-SPEED ELEVATOR BASED ON FUZZY CONTROLLERAbstract: Increase of elevator speed brings about amplified vibrations of high-speed elevator. In order to reduce the horizontal vibrations of high-speed elevator, a new type of hydraulic active guide roller system
2、 based on fuzzy logic controller is developed. First the working principle of the hydraulic guide system is introduced, then the dynamic model of the horizontal vibrations for elevator cage with active guide roller system and the mathematical model of the hydraulic system are given. A fuzzy logic co
3、ntroller for the hydraulic system is designed to control the hydraulic actuator. To improve the control performance, preview compensation for the controller is provided. Finally, simulation and experiments are executed to verify the hydraulic active guide roller system and the control strategy. Both
4、 the simulation and experimental results indicate that the hydraulic active guide roller system can reduce the horizontal vibrations of the elevator effectively and has better effects than the passive one, and the fuzzy logic controller with preview compensation can give superior control performance
5、. Key words: High-speed elevator Horizontal vibmions Hydraulic /Mt glide roller system Fuzzy logic control0 INTRODUCTIONHorizontal vibration is ens of the main problems affecting ride comfort in elevators. There are many reasons contributing to the horizontal vibrations of elevators, such as the irr
6、egularity of the guide rails, the abnormity of the guide rollers, the running speed of elevators, the offset load of passengers, the wind buffeting, etc. Research indicates that these horizontal vibrations are mainly generated by the irregularity of the guide rails1 and are in proportion to the runn
7、ing speed of elevators23 To meet the need of high and super-high buildings, elevator speed is now becoming higher and higher, which results in serious horizontal vibrations. Suppression method of horizontal vibrations is necessary for high-speed elevator. The conventional horizontal vibration reduct
8、ion techniques include structure changes and passive guide roller system using stiff spring. These passive suppression methods need no power supply and have the advantages of simple structure, low price and high reliability and can work well when the elevator speed is low. But they cannot do with th
9、e increasing elevator speed because of such disadvantages as limited frequency band width and low working force. Active vibration reduction techniques can flexibly cope with the new situations and have good effects and have been used widely. Accordingly, studies on the active suppression method of h
10、orizontal vibrations for high-speed elevators have been advanced. Now Mitsubishi Co. and others have already developed their active guide roller device to alleviate horizontal vibrations of high-speed elevators based on magnetic effect451. And they have acquried patent protection for that61. Accordi
11、ngly, we propose in this paper a new type of active guide roller system based on hydraulic actuator which can reduce the horizontal vibrations of high-speed elevators. First, the structure and the working principle of the hydraulic active guide roller system are analyzed. Then the mathematical model
12、 of the system is given. And the fuzzy logic controller with preview compensation is designed to control the active guide system. Last, computer simulation and experimental tests are performed to verify the effectiveness of the hydraulic device and the controller.1 ACTIVE CONTROL MODEL OF HORIZONTAL
13、 VIBRATIONS FOR ELEVATOR CAGEThe elevator system is a kind of complex multi-body structure. Elevator cage is the part loading the passengers. Fig. 1 is the configuration of a.i elevator cage. It includes a car body, a frame and four passive guide roller systems. The car body is supported by the fram
14、e and the guide system is fixed on the frame. The three rollers of the conventional guide systems are contacted with the T type rails tightly by the stiff spring damper. The elevator goes up and down when the guide roller runs along the rail. The unevenness of the guide rails is transmitted to the e
15、levator cage through the guide roller system and brings about horizontal vibrations of the elevator. This problem can be overcome by the active guide roller system.Considering the horizontal vibrations in the direction parallel to the elevator door, the dynamic model of the horizontal vibrations for
16、 elevator cage with active guide roller system is developed as shown in Fig. 2. Here the car body and the frame are supposed to be a whole rigid symmetrical body, the rollers are modeled as mass-spring-damper units with same structure and parameters71, the elevator runs at the constant velocity v, and only the rail disturbance is taken into account. The motion equations of the elevator cage in the horizontal direction are given as2 HYDRAULIC ACTIVE GUIDE ROLL
