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

Model-based approach for elevator performance estimation

Elevator tension members are disclosed. The disclosed tension member longitudinally extends along a longitudinal axis and includes a plurality of fibers formed into one or more primary strands or cords extending parallel to the longitudinal axis and a plurality of fibers formed into one or more secondary strands or cords extending parallel to the longitudinal axis and through less than the full length of the belt, and a jacket retaining the primary and secondary strands or cords. The secondary strands or cords have a tensile modulus greater than a tensile modulus of the jacket and less than a tensile modulus of the primary strands or cords. Methods of making the tension member are also disclosed.

Elevator tension member

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:

The dynamic models of an integrated system based on active steering and an active suspension are established; these include a vehicle model, an active steering system model, an active suspension system model, a tyre model and a road input model. The performance evaluation indices of the integrated system are proposed, including the steering road feel, the steering sensitivity and the ride comfort. On the basis of the target cascading theory, an analytical target cascading method is researched. Considering the coupling factors of the integrated system, the optimization model of the integrated system is established with the target cascading method. Then, the parameters are optimized based on a multi-island genetic algorithm, and the optimized results are compared with those of the collaborative optimization method. Thus, a theoretical foundation and technical support for the integration design of the automotive chassis can be provided.

Research on the multi-disciplinary design method for an integrated automotive steering and suspension system:

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

In an elevator wire rope 1 structured by twisting a plurality of schenkels 3 , each schenkel 3 being formed by twisting a plurality of strands 2 , each strand 2 being formed by twisting a plurality of fine steel wires 2 a to 2 g , the interior of the wire rope being filled with a resin 4 , and the surface of the wire rope being covered with a resin 5 , wherein the direction in which the fine steel wires 2 a to 2 g and the strands 2 are twisted and the direction in which the schenkels 3 are twisted are mutually opposite, and the diameter d 4 of the inscribed circle of the plurality of twisted schenkels 3 is smaller than the diameter d 2 of the schenkel 3.

Elevator wire rope

PROBLEM TO BE SOLVED: To provide a thin type hoisting machine capable of being applied as one for an elevator without a machine room for braking an outer peripheral surface of a brake drum and being miniaturized by utilizing an efficient output of an electromagnetic brake device. SOLUTION: In external shape and dimension of the electromagnetic brake device 6 on an upper side of a body 1 of equipment, of the electromagnetic brake devices 6 oppositely installed at two upper and lower portions, thickness (axial direction thickness) is made smaller than that of the whole of the hoising machine, and a width Lw of a direction between two traveling parts 20a and 20b of a rope 20 to be a width direction is made smaller than a distance between the traveling parts 20a and 20b (which is substantially the same as a diameter of a sheave 2). The electromagnetic brake device 6 is capable of exerting high output efficiency, while maintaining the output level and being compactly constituted, since the electromagnetic brake device 6 has the cross-sectional shape close to a square and does not become slender. COPYRIGHT: (C)2011,JPO&INPIT

Thin type hoisting machine and driving motor for thin type hoisting machine

In an inspection tool (10) for an elevator wire rope for detecting a leakage flux by magnetizing a part of a rope (2) used for an elevator and measuring damage of the rope (2), a curvature portion is formed by pushing and curving the rope (2) in a longitudinal direction and a leakage flux is detected by magnetizing the curvature portion.

Inspection tool for wire rope

An elevator with a vibration damper is disclosed. A dynamic vibration absorber (32) is disposed on the lower part of an elevator car (1) and is used for reducing vertical vibration inside the elevator car. The dynamic vibration absorber is provided with an elastic component (16), counter weights (15) disposed on two ends of the elastic component, a single drive unit for altering gaps between a fulcrum of the elastic component and each counter weight, a sensor (14) for detecting a load capacity of the elevator car, and a detection unit for detecting positions and speed of the elevator car. The single drive unit alters and controls the gaps between the fulcrum and the counter weights, so as to enable an anti-resonance point to accord with shock excitation vibrational frequency to the elevator car in an elevator car vibration system, wherein the anti-resonance point changes with the changes of positions and load capacities of the elevator car, and the shock excitation vibrational frequency changes with the changes of the speed of the elevator car. Moreover, two sides of the central part of the elastic component is respectively provided with a pair of rollers (17) which clamp the elastic component from up and down, and the fulcrum of the elastic component is formed by the positions of the rollers.

Naoaki Noguchi

Papers

Study on Active Vibration Control for High-Speed Elevators

Elevator wire rope

Thin type hoisting machine and driving motor for thin type hoisting machine

Inspection tool for wire rope

Elevator with vibration damper