[in Japanese]

View full abstract

Recently concern for long period ground motion that has predominant period of more than a few seconds has been increasing. For example, a sloshing phenomenon of petroleum tanks in the Tokachi-oki earthquake (2003), resonance of high-rise buildings in the Great East Japan earthquake (2011) and so on were caused by the long period ground motion. In high-rise buildings, elevators are important vertical transportation equipment. However elevators for high-rise buildings have many components that have long natural period such as a main rope, and resonance of these kinds of components is apprehended. Therefore this paper deals with investigation regarding seismic response of elevators in high-rise buildings against long-period ground motion. The investigation is conducted from the viewpoint of response of rope, impact load by rope, strength of rails and gap between buildings.

View full abstract

Long-period earthquake ground motion may amplify the response of high-rise buildings. When elevator rope resonates with the response, the displacement will be large and equipment in the shaft may be damaged. Recently, rope analysis methods to simulate rope vibration with an earthquake ground motion have been developed. However, detailed simulation requires much time, actual displacement may exceed damaging level before the simulation concludes. In this paper, we discussed the threshold of rope displacement and the acceptable time for estimation and proposed some methods which simplify the analysis of building response and rope vibration. Comparing them regarding the accuracy and required time of estimation, it was revealed that simplification of building response simulation effectively reduces simulating time without crucial loss of accuracy.

View full abstract

Elevator ropes for a high-rise building are excited forcibly by the sway of the building caused by wind forces and long-period ground motion. This paper describes about effective damping method of the elevator ropes lateral vibration. The behavior of the elevator ropes is influenced by interaction between deflection of the elevator rope and the movement of a compensation sheave. By using the interaction, it is possible to damp the elevator ropes. Specifically, the lateral vibration of the elevator ropes is damped by attaching a damper to a compensation sheave and resisting vertical vibration of this sheave. In this research, we verified the effect of this damping method by performing experiments and simulations.

View full abstract

It is indispensable for vertical moving by an elevator installed in a low-rise building to a skyscraper. If the elevators were established near rooms, vibration of driving motors through floor or acoustic noise might not be endured for the habitants. The more downsize motor, that is increase of flux density from the motor, and lighter motor, that is lowering elasticity of construction, are, the more claim of nuisance by users have. We analyzed these phenomena focusing on mode of electro-magnetic force by FEM and modal analysis. And then we verified this theory by experimentation. We found the vibration mode 1,2 or 3, near-by natural frequency in elevator running against electro-magnetic mode 24or12. We will express our new standpoint of reduction to the electro-magnetic vibration in this paper.

View full abstract

This paper describes problems of sheave and rope caused by Pitch Circle Diameter (P.C.D.) difference. Traction sheave of elevator has P.C.D. difference between its grooves because of machining error, growth of uneven wear by elevator operation and so on. When traction sheave has P.C.D. difference, running radius of rope on each groove is different from each other, and it is suspected doing damage to sheave and rope. In this paper, we measure rope tension and rope slip etc. under several P.C.D. conditions that there are two grooves and two ropes on sheave, and we investigate the influence of traction sheave P.C.D. difference on sheave and rope.

View full abstract

By adopting liquid crystal to an elevator control panel information to be displayed increases, and the convenience of the elevator may improve. Furthermore, we balance it with the correspondence for the sense of color handicapped person by considering a tone of color in the display. To improve the operability of the control panel even though many floors exist in a high-rise building, we constitute it without reducing number of the button. we developed the horizontal button layout with the visually impaired coped with. On the other hand, we introduce the control panel in the cage that the convenience of the wheelchair user improves without reducing the effective area in the cage by reviewing a control panel for wheelchairs and the position relations of the handrail.

View full abstract

A review of laws and regulations about the safety of amusement ride is reported. In the failure analysis of roller-coaster's cone-bolt, in Osaka Exposition amusement park, the bolt of M36 is tough enough for 15 years operation. The police's assumption of fatigue failure has to be scrutinized again.

View full abstract

In this paper, we pay attention to fundamental mechanisms of the space elevator climber. We developed the mechanism that can ensure the stable ascent and descent of the climber. We also developed the experimental equipment similar to a treadmill which was used to examine the climber's operation. As a result, ascent and descent of the climber without slippage of the wheels was successfully achieved.

View full abstract

The more elevator in recent years, the more safety and efficiency are desired. The automatic probe climber is one solution. It replaces worker and do inspect lift and amusement attraction. In this study, we made the prototype model of the automatic probe climber and estimated its basic performance. And we found out the performance is influenced by pushing force we make new one from the experimental result.

View full abstract