Study on a Drop Tower with the Linear-Motor Driving System

直线电机驱动系统落塔的研究

• 批准号: 01850040
• 负责人: NANBU K
• 金额: $ 9.66万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B).
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01850040/
• 关键词: Electromagnetic Force; Linear Motor; Non - Gravity; Drop Tower; Vacuum; 電磁推進; 自由落下

The drop tower is the facility for doing non-gravity experiments. It consists of a tube and a dropping laboratory, which is called capsule. If no aerodynamic drag acted on the capsule, non-gravity field would prevail inside the capsule. Actually, acceleration of the capsule is necessary to compensate the drag. In the present work a new idea for the drop tower is tested experimentally. That is, the tube in which the capsule is let fall is evacuated and the drag thus diminished is canceled by the driving force of a linear induction motor.The non-gravity condition can be realized by adjusting both the pressure in the tube and the frequency of the field coil. The details are as follows.(1) Since the drag rapidly increases with the pressure, the pressure is desirable to be less than 1 Torr.(2) When the pressure is less than 1 Torr, the frequency of 100 Hz is enough to realize the non-gravity condition.(3) If the linear motor with 1.5 m pole pitch is used, the non-gravity period of 10 sec may be realized by controlling the frequency in the range 0-100 Hz.(4) The linear motor is found to be useful also for braking the falling capsule.

降落塔是做无重力实验的设备。它由一根管子和一个被称为胶囊的滴管实验室组成。如果没有空气动力阻力作用于太空舱，太空舱内部就会形成非重力场。实际上，胶囊的加速度是补偿阻力所必需的。本文对一种新的落塔设计思路进行了实验验证。也就是说，让胶囊下落的管子被抽走，从而减少的阻力被线性感应电动机的驱动力所抵消。通过调节管内压力和场线圈频率，可以实现无重力状态。具体情况如下。(1)由于阻力随压力的增大而迅速增大，因此希望压力小于1torr。(2)当压力小于1 Torr时，100 Hz的频率足以实现无重力状态。(3)如果使用1.5 m螺距的直线电机，通过控制频率在0-100 Hz范围内，可以实现10秒的无重力周期。人们发现直线电机也可用于使坠落的胶囊制动。

项目成果

K.Nanbu,Y.Shoji,I.Warabioka,S.Igarashi,T.Yokoi,and J.Tani: "Linear Drive of an Aluminum Copsule Felling in an Evacuated Tube" Proc.Intern.Symp.Application of Electramagnetic Forces. (1991)

K.Nanbu、Y.Shoji、I.Warabioka、S.Igarashi、T.Yokoi 和 J.Tani：“真空管中铝胶囊落入的线性驱动”Proc.Intern.Symp.电磁力的应用。

K. Nanbu, Y. Shoji, I. Warabioka, S. Igarashi, T. Yokoi and J. Tani: "Linear Drive of an Aluminum Capsule Falling in an Evacuated Tube" Proc. Intern. Symp. Application of Electromagnetic Forces.

K. Nanb​​u、Y. Shoji、I. Warabioka、S. Igarashi、T. Yokoi 和 J. Tani：“铝质胶囊在真空管中的线性驱动”Proc。

南部・松田・庄子・五十嵐・谷・横井: "両端開放の管内を落下する物体の電磁加速" 日本機械学会論文集. 57. 74-78 (1991)

Nambu、Matsuda、Shoko、Igarashi、Tani、Yokoi：“物体落入两端开放的管道中的电磁加速度”，日本机械工程师学会汇刊 57. 74-78 (1991)。

K.Nanbu,Y.Shoji,I.Warabioka,S.Igarashi,T.Yokoi,and J.Tani: "Linear Drive of an Aluminum Capsule Falling in an Evacuated Tube" Proc.Intern.Symp.Application of Electromagnetic Forces. (1991)

K.Nanbu、Y.Shoji、I.Warabioka、S.Igarashi、T.Yokoi 和 J.Tani：“铝胶囊落入真空管中的线性驱动”Proc.Intern.Symp.电磁力的应用。

K. Nanbu, H. Matsuda, Y. Shoji, S. Igarashi, J. Tani and T. Yokoi: "Acceleration of a Dropping Capsule in an Open Tube by a Ronderomotive Force" Trans. Japan Soc. Mech. Engrs. 57-533, Ser. B. 74-78 (1991)

K. Nanb​​u、H. Matsuda、Y. Shoji、S. Igarashi、J. Tani 和 T. Yokoi：“通过旋转动力加速开管中掉落的胶囊” Trans。