CN102590878A - Device for improving microgravity level of falling cabin of falling tower or well equipment - Google Patents

Abstract

The invention provides a device for improving the microgravity level of a falling cabin of falling tower or well equipment, comprising the falling cabin, an accelerometer, a controller and a propeller. The falling cabin does free-fall motion on the ground; the accelerometer is used for measuring the residual disturbance acceleration of the falling cabin; the controller is used for processing the residual disturbance acceleration measured by the accelerometer to obtain a closed-loop feedback control signal; and the propeller is used for propelling the falling cabin under the control of the closed-loop feedback control signal so that the falling cabin overcomes the residual disturbance of the outside environment. Under the condition of not vacuumizing and maintaining, the falling cabin, namely the free-fall experiment device is used, the accelerometer, the controller and the force executer or propeller are combined together, and the closed-loop control system is used to compensate the falling cabin for the residual disturbance acceleration, particularly to overcome the air resistance effect, thus the microgravity environment in the falling cabin is effectively improved, and the microgravity level of the falling cabin is expected to increase to 10<-8>-10<-6>g0.

Description

Tower or the microgravity level in well equipment decline cabin of falling of falling improved device

Technical field

The invention belongs to microgravity environment experiment field, be specifically related to a kind of microgravity level that falls the tower or the well equipment decline cabin that falls and improve device, this device can be used for improving the fall microgravity level in the tower or the well experimental facilities decline cabin that falls of ground.

Background technology

Because the further requirement of space basis scientific experiment precision, for example high precision space gravity experiment (space gravitational wave detection, space equivalence principle test etc.) and space microgravity experiment (relating to life science, fluid, burning, material science etc.); Need further to improve the microgravity level of satellite platform or ground experiment platform.The tower of falling is arranged for the method that provides microgravity environment mainly to adopt freely falling body on the ground, major equipment or the well that falls, para-curve aircraft and rocket etc.

Fall the microgravity level in the tower or the well experimental facilities decline cabin that falls generally 10 ^-2～10 ^-6g ₀(g ₀Be earth surface acceleration of gravity), experimental period is generally less than 10s.Wherein air resistance is the principal element that influences cabin microgravity level, and the acceleration expression formula that introduce at freely falling body process air resistance in the cabin that falls is:

$a=\frac{1}{2}\frac{C_{x}S{\mathrm{\&rho;v}}^2}{m}---\left(1\right)$

C wherein _xThe expression resistance coefficient depends on to fall the planform design in cabin, and S is that the characteristic cross-section of falling direction is long-pending, density of medium when ρ falls in medium for the cabin that falls, and v is the speed of related movement of cabin in medium that fall, m is the quality in cabin of falling.So in order to reduce the remaining acceleration that air resistance is introduced, relatively effective method is to reduce the density that medium is an atmosphere.Mainly contain dual mode at present; The one, adopt the single cabin design that falls; The freely falling body environment in single cabin is carried out low vacuum handle, can reach the vacuum tightness of 1Pa such as the fall vacuum steel pipe of tower of Bremen, Germany, the microgravity level that the cabin (single cabin) that falls this moment falls can reach 10 ^-5～10 ^-6g ₀The 2nd, adopt two cabin designs that fall, promptly only needing two of assurances to fall between the cabin is that low vacuum gets final product, such as the tower that falls of country of Inst. of Mechanics, CAS microgravity experiment chamber, its microgravity horizontal estimated can reach 10 ^-5g ₀But said method to fall tower structural design and vacuum drawn with kept higher requirement, its best microgravity level is 10 ^-6g ₀Magnitude.

Summary of the invention

The object of the present invention is to provide a kind of microgravity level that falls the tower or the well equipment decline cabin that falls to improve device; Extract and keep down at needing no vacuum; Effectively improve the microgravity level in ground microgravity experiment equipment (tower or the well that falls fall) equipment decline cabin, better experimental situation is provided.

Tower or the microgravity level in well equipment decline cabin of falling of falling improved device, comprises

The cabin 1 that falls is used for doing on the ground the movement of falling object;

Accelerometer 2 is used to measure the remaining disturbance acceleration in the said cabin 1 that falls;

Controller 3 is used for the remaining disturbance acceleration that said accelerometer 2 is measured handled obtaining the close-loop feedback control signal;

Thruster 4 is used under said close-loop feedback control signal controlling producing thrust in the said cabin 1 that falls, and makes the said cabin 1 that falls overcome the remaining disturbance of external environment.

Further, said accelerometer 2 is one or more, and one of them is placed in the barycenter in the said cabin 1 that falls, the position beyond other the barycenter that is distributed in the said cabin 1 that falls.

Technique effect of the present invention is embodied in:

The fall microgravity level in the tower or the well equipment decline cabin that falls of the present invention is improved device; Extracting and keep down at needing no vacuum, is the experiment with falling objects device in conjunction with the cabin that falls, and integrates accelerometer, controller and power execution machine or thruster; Utilize closed-loop control system that the compensation of remaining disturbance acceleration is carried out in the cabin that falls; Particularly overcome the influence of air resistance, it can improve the inner microgravity environment in cabin that falls, and its microgravity level is expected to bring up to 10 ^-6～10 ^-8g ₀, (specifically depending on the systematic parameter in the resolution of accelerometer, angle of rake thrust size and the cabin that falls etc.), g ₀Be earth surface acceleration of gravity.

Description of drawings

Fig. 1 is that the fall microgravity level in the tower or the well equipment decline cabin that falls is improved the apparatus structure synoptic diagram.

Embodiment

When experiment with falling objects is carried out on the ground in the cabin 1 that falls; (barycenter that needs to be placed on the cabin to accelerometer is to reduce the influence that the cabin that falls is rotated or vibrated to utilize accelerometer 2; Can place simultaneously a plurality of accelerometer measures cabin attitude that falls) measure the remaining disturbance acceleration (mainly be air damping) of cabin in the freely falling body process, and the input signal of measurement result as controller 3, through after the processing of controller 3; Obtain feedback control signal; This signal power that imposes on is carried out machine or thruster 4 (mainly be placed on the vertical falling direction, also can carry out attitude compensation and control at fall a plurality of power execution machines of other place placements of cabin or thruster), and power execution machine or thruster 4 generation thrust are on the cabin 1 that falls; Its resultant effect makes cabin 1 to overcome the remaining disturbance of environment (such as air resistance, cabin vibration etc. falls).Can improve the inner microgravity environment in cabin that falls through this device, improve its microgravity level, be expected to reach 10 ^-6～10 ^-8g ₀

Claims (2)

1. tower or the microgravity level in well equipment decline cabin of falling of falling improved device, comprises

The cabin (1) that falls is used for doing on the ground the movement of falling object;

Accelerometer (2) is used to measure the remaining disturbance acceleration in the said cabin (1) that falls;

Controller (3) is used for the remaining disturbance acceleration that said accelerometer (2) is measured handled obtaining the close-loop feedback control signal;

Thruster (4) is used under said close-loop feedback control signal controlling producing thrust in the said cabin (1) that falls, and makes the said cabin (1) that falls overcome the remaining disturbance of external environment.

2. the microgravity level that falls the tower or the well equipment decline cabin that falls according to claim 1 is improved device; It is characterized in that; Said accelerometer (2) is one or more, and one of them is placed in the barycenter in the said cabin (1) that falls, the position beyond other the barycenter that is distributed in the said cabin (1) that falls.

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