In this work, the horizontal nonlinear response of a three-degree-of-freedom vertical transportation model excited by guide rail deformations is investigated. The equation of motion contains nonlin...

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On nonlinear horizontal dynamics and vibrations control for high-speed elevators

Due to the influencing factors, such as irregularity of guide, piston wind excitation in the hoistway, and uncertain swinging of hoisting rope during the operation of high-speed traction elevator, ...

Intelligent control of active shock absorber for high-speed elevator car:

High-speed elevator horizontal vibration (HsEHV) is a problem that seriously affects ride comfort. To solve this problem, a design parameter optimization method for HsEHV reduction was studied. A dynamic equation of HsEHV was established, and its response value was calculated using a precise integration method. The influence of the design parameters on horizontal vibration was also analyzed. An optimization model of the design parameters for HsEHV reduction was constructed, and the response surface model of objective function (the peak-to-peak value of horizontal vibration acceleration) was constructed using Latin hypercube sampling. We adopted a multiobjective genetic algorithm to optimize the design parameters for horizontal vibration reduction and used the min-max standardization method to select an optimal solution set. Finally, a KLK2 high-speed elevator made by Canny Elevator Co., Ltd., was utilized as an example to analyze the influencing factors of HsEHV, optimize the design parameters to reduce horizontal vibration, and verify the optimized results using numerical calculation and prototype testing.

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A Vibration-Related Design Parameter Optimization Method for High-Speed Elevator Horizontal Vibration Reduction

The experimental positioning of a flexible arm by a human operator is described. The flexible arm is characterized by nonlinearity and infinite degrees of freedom. The human operator interprets a given task and finds a procedure for the operation, devising an effective way of achieving the goal, based on his or her experience and knowledge about the task. The question of how these results can be modeled and applied to automatic control systems is considered, and the use of a reference input filter is proposed. The filter gives a satisfactory overall response if the time constant is chosen appropriately. >

Manual control of a flexible arm and its application to an automatic control system

The problem of randomness of design parameters objectively exists in the high-speed elevator cabin system. The definite and random part of the acceleration response expressions were derived according to perturbation theory and the transverse vibration acceleration response of the observation point was analyzed. The sensitivity expressions of various random parameters to the acceleration response were deduced by solving the random response of expression and comparing the coefficients of various parameters of the random part. The different impacts of various parameters on the acceleration response were analyzed according to the expression of acceleration response sensitivity. Based on the displacement response covariance matrix and random parameter covariance matrix, the standard deviation characteristic of the acceleration response was obtained and analyzed. The results showed that the random parameters made the acceleration response to be more discrete. Additionally, the randomness of the geometrical parameters had the greatest influence on transverse acceleration. The results can provide a reference for anti-vibration design of high-speed elevators and safety assessment.

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Analysis of Transverse Vibration Acceleration for a High-speed Elevator with Random Parameter Based on Perturbation Theory

When elevators travel at high speed, horizontal vibrations of the car tend to occur due to guide rail deformations, deteriorating ride comfort. Therefore, several active control systems have been developed to reduce these vibrations. These systems consist of six actuators, which independently move the guide rollers. To reduce costs and installation time, it is necessary to develop a system with a minimum number of actuators and a simplified controller. We developed a system with only three actuators. The controller incorporates an H-infinity control design method for maintaining stability of the system when there is a change in load. Furthermore, from a practical point of view, it is important to reduce the order of the controller so that the time for on-site parameter tuning can be reduced. Therefore, we reduced the H-infinity controller to a P controller. We demonstrated that the maximum amplitude of vibrations of a car with active control system can be reduced to almost half the vibration amplitude without control.

Study on Active Vibration Control for High-Speed Elevators

The present invention prevents cracking of a brake shoe even when the sliding surface of the brake shoe is heated to a high temperature and provides high reliability. The present invention provides a brake shoe for elevator emergency stop which generates a braking force by pressing brake shoes against a guide rail and making the brake shoes 5 slide to stop an elevator cage in the event of anomalies, including the brake shoes made of a cast iron material having a plurality of grooves 3 formed in a direction substantially perpendicular to the guide rail and gear teeth which constitute a sliding surface with the brake shoes 5 formed as gaps between the grooves, wherein the depth of the grooves is 3 mm or more and not more than 1.7 times the width of the gear teeth.

Brake Shoe for Elevator Emergency Stop

The invention provides an elevator with a lift car air pressure control device. The air pressure control device changes air pressure in a car lift when an elevator rises, thereby allowing passengers to realize air pressure change before the air pressure in the lift car changes greatly and providing time for the passengers to swallow. The elevator possesses a lift car air pressure control device which controls the air pressure in the lift car in dependence on a staged air pressure changing mode of the rising of the elevator lift through the inhalation and exhaust of an air blower in the lift car. The elevator is provided with the air blower, an air volume switching device, an air volume adjusting device and a control device. The air volume switching device is used for performing staged switching on the air volume going in and out of the car lift; the air volume adjusting device is used for continuously changing the air volume air volume going in and out of the car lift; the control device controls the air blower, the air volume switching device, and the air volume adjusting device in dependence on elevator operation information.

Elevator with lift car air pressure control device

The present invention provides an elevator with a damping device, comprising: guide rails (71a, 70b) arranged on a left-right axis which are arranged at left and right of an elevator car (1) and passes a centre-of-gravity position of the elevator car (1); a plurality of acceleration detectors (7, 8, 9, 10, 11, 12) for detecting vibration of the elevator car (1) in left-right and front-back directions; and a first controller (13) and a second controller (14) for controlling actuators (30a, 30b, 501, 50b, 601, 60b) according to outputs of the acceleration detectors, wherein the first controller controls translation quantity of the front-back direction, rotating quantity around the left-right axis, and rotating quantity around a vertical axis, the second controller controls translation quantity of the left-right direction, and rotating quantity around a front-back axis. Therefore, various vibration modes can be suppressed by a simple structure and a smaller number of actuators and sensors, and vibration of the elevator car can be effectively suppressed.

Elevator with damping device

When an elevator is lifted, an ear blockage phenomenon occurs due to changes of an internal pressure of an elevator car. The internal pressure of the elevator car is changed repeatedly between two different pressure change rates so that a control method inducing passengers' swallow actions can effectively ease the ear blockage phenomenon. However, in existing control methods, the pressure in the elevator car needs to be repeatedly switched to be a positive pressure and a negative pressure relative to the atmospheric pressure in a short time, and problems that a structure of a control device and a control method are complex exist. When the elevator goes down, a positive pressure state in the elevator car is only used to form stair-stepping pressure control in the first half of the running time (T T0). Therefore, the pressure control device only needs to implement switchover once, that is to say, a pressurized state is switched into a pressure reducing state, and the pressure control can be realized.

Koichi Miyata

Papers

Study on Active Vibration Control for High-Speed Elevators

Brake Shoe for Elevator Emergency Stop

Elevator with lift car air pressure control device

Elevator with damping device

Control method of internal pressure of elevator car