Noise-reduction of the sliding guide is one of the major problems in the elevator system. This paper regards the cause of these noise phenomenon as self-excited vibration. Firstly, a prototype is made to evaluate the sliding guide in the elevator system which shows self-excited vibration caused by the asymmetry matrix of the system. Secondly, a simplified vibration model is introduced, and the radius of gyration and the position of the gravitational center are selected to suppress vibration using the existing stability criteria. Finally, the effect of vibration suppression is confirmed through several experiments changing these parameters, and the stability conditions of these parameters are quantified. The result of this study provides design method for suppressing vibration of the sliding guide in the elevator system.

This paper presents an analytical model using Statistical Energy Analysis (SEA) to estimate noise at the interior of the car. SEA is a method that calculates the transfer of energy using the average value of energy at a frequency band. In the SEA model, since the calculation is performed with energy, the sound field and eigenmode cannot be taken into account. Therefore, an error may occur when comparing with the measurement point. In order to consider the influence of the sound field and the natural mode generated in the car, the interior air of the car was modeled by Finite Element Method (FEM). The frequency of the mode obtained from FEM coincided with the frequency of the mode actually measured in the car. The model with SEA and FEM could simulate the non-resonant mode at the center of the car, and it was found the proposed model matched the experimentally obtained car interior noise better than the SEA model.

Users in an elevator hall have no way to confirm the crowded degree in an elevator car, so they might be discouraged when a full elevator arrived. In order to improve this situation, we developed an indication system for indicating the crowded degree in an elevator car. In this research, we clarified how to indicate the crowded degree without mismatch between the users feeling about the real crowded and the indication. As a result, since the users in an elevator hall can appropriately grasp the crowded degree in an elevator car, the convenience and comfort of an elevator can be improved by this system.

A conventional system based on a photoelectric sensor could prevent that an elevator door hits against the passenger. The system can make the door reverse from closing direction when it detects the passenger. However, the system has some problems such as the detection area is narrow. In order to solve the problem, a new system constructed with a camera and image analysis algorithm has been developed. But, the new system has a problem of misjudging the elevator door as a passenger while it is affected by ambient light. In this study, a measure to discriminate between the door and the passenger is established.

Discovering regularities from a single species of time-series data used in the abnormality detection technique, it is difficult to perform the identification of discrimination and deterioration degree of the damage factor of the wire rope is a technique for performing fault detection and prediction. In this study focused on correlation of time series data obtained from the plurality of kinds of sensors, the continuous wavelet transform (CWT) and principal component analysis (PCA) from the detected values at the wire rope flaw detector according to experiments using a multi sensor the feature amount extracted, by performing classification by kernel support vector machine (K-SVM), and consider the possibility of an abnormally detection technology and soundness evaluation method of the wire rope.

In elevator industries, there is a demand for technologies for shortening work period. In this paper, we examined the weld-less construction method to couple the rail brackets by drilling screw. The calculation methods of the shear load to the drilling screw were studied. Since the load on the drilling screw varies depending on the bracket designs for each model, it is necessary to calculate for each models so that the load does not exceed the allowable shear strength. In addition, the static shear and fatigue tests of drilling screw were carried out. The actual shear strength of drilling screw is approximately twice the permissible shear strength. If the load to drilling screws are less than the permissible shear strength, it will not be broken by an earthquake load. Even if a load equivalent to the long-term permissible shear strength is repeatedly applied, the drilling screw will not be fatigued or loosened.

Several modelings of the elevator rope sway have been proposed by elevator makers. However, the modelings rely on elevator makers’ specific information. Therefore a generalized rope sway model has been required especially for the seismic operation against long-period ground motions or the strong wind operation. In this paper, a difference equation against the wave propagation equation of the string vibration is applied for the resonance evaluation of the elevator suspension rope. By the simulation results, it is concluded that the resonance behavior is not linear but affected by the car vertical motion induced by the rope sway. As the resonance behavior of the rope sway is influenced by several physical parameters, the effect of the rope length is evaluated as a first step.

The elevator car is suspended by ropes to move vertically along the elevator shaft. When the car stops at a specific floor in the building, the car might receive a large rope sway due to the enforced motion of the building during a strong wind or a big earthquake. In general, the rope sway motion doesn’tshow a linear vibration characteristic, but the resonance peak shows softening stiffness or hardening stiffness. In this paper, simplified equations of rope motion are derived against the horizontaland vertical direction. Each equationis expressed as 1-DOF modeland the both vibration modes are coupled with each other. It is found that the coupled vibration induces the nonlinear vibration behavior.

Elevators are essential for means of vertical transportation. In recent year, elevators to be installed in high-rise buildings are long stroke, thus the elevator ropes are longer. High-rise buildings have longer natural period than conventional buildings. As elevator ropes become longer, the natural period of the elevator ropes become longer as well, and get closer to the natural period of the building. Consequently, the elevator ropes are hooked to the equipment in hoistway when the elevator ropes vibrate by an external force, such as a strong wind and earthquake. Secondary damage such as containment of passengers and elevator service stop may occur. It has become a problem. For example, The 2011 off the Pacific coast of Tohoku Earthquake, 2215 cases such as catch and damage of elevator ropes have been reported. However, operations of elevators after earthquakes are required. Therefore, in this research, we aim to design elevator that can be operated even after the earthquakes. Conventional research has confirmed that dividing lift stroke install multiple elevators is effective for reducing the response of the rope. An index, which is suitable for risk assessment, is required. In this paper, we examine the evaluation index of the fragility curve.