CN102590878B - 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

The Level of Microgravity in tower or the well equipment decline cabin that falls of falling improves device

Technical field

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

Background technology

Due to the further requirement of space basis scientific experiment precision, such as high precision spatial attraction experiment (detection of spatial attraction ripple, space equivalence principle test etc.) and space microgravity experiment (relating to life science, fluid, burning, material science etc.); Need further to improve the Level of Microgravity of satellite platform or ground experiment platform.The method that provides microgravity environment mainly to adopt freely falling body on ground, the tower of falling is arranged major equipment or the well that falls, para-curve aircraft and rocket etc.

Fall the Level of Microgravity in tower or the well experimental facilities decline cabin that falls generally 10 ^-2～10 ^-6g ₀(g ₀for earth surface acceleration of gravity), experimental period is generally less than 10s.Wherein air resistance is the principal element that affects the cabin Level of Microgravity, 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 _xmean resistance coefficient, depend on to fall the planform design in cabin, the characteristic cross-section that S is falling direction is long-pending, and ρ is the density of cabin medium while falling in medium of falling, and v is the speed of related movement of cabin in medium that fall, and m is the quality in cabin of falling.Therefore the remaining acceleration of introducing in order to reduce air resistance, relatively effective method is to reduce the density that medium is atmosphere.Mainly contain at present two kinds of modes, the one, adopt the single cabin design that falls, freely falling body environment to single cabin carries out low vacuum treatment, and such as the fall vacuum steel pipe of tower of Bremen, Germany can reach the vacuum tightness of 1Pa, the Level of Microgravity that the cabin that now falls (single cabin) falls can reach 10 ^-5～10 ^-6g ₀; The 2nd, adopt two cabin designs that fall, only needing two of assurances to fall between cabin is that low vacuum gets final product, such as the tower that falls of Inst. of Mechanics, CAS's country's microgravity experiment chamber, its Level of Microgravity is estimated to reach 10 ^-5g ₀.But said method is to falling tower structural design and vacuum drawn and maintain higher requirement, and its best Level of Microgravity is 10 ^-6g ₀magnitude.

Summary of the invention

The object of the present invention is to provide a kind of Level of Microgravity that falls tower or the well equipment decline cabin that falls to improve device, without vacuum drawn and maintain under, effectively improve the Level of Microgravity in ground microgravity experiment equipment (tower or the well that falls fall) equipment decline cabin, better experimental situation is provided.

The Level of Microgravity in tower or the well equipment decline cabin that falls of falling improves device, comprises

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

Accelerometer 2, for measuring the remaining disturbance acceleration in the described cabin 1 that falls;

Controller 3, process and obtain the close-loop feedback control signal for the remaining disturbance acceleration that described accelerometer 2 is measured;

Thruster 4, for producing thrust under controlling in described close-loop feedback control signal in the described cabin 1 that falls, make the described cabin 1 that falls overcome the remaining disturbance of external environment.

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

Technique effect of the present invention is embodied in:

The fall Level of Microgravity in tower or the well equipment decline cabin that falls of the present invention improves device, without vacuum drawn and maintain under, in conjunction with the cabin that falls, it is free fall experimental device, accelerometer, controller and power execution machine or thruster are integrated, utilize closed-loop control system to carry out the compensation of remaining disturbance acceleration to the cabin that falls, particularly overcome the impact of air resistance, it can improve the microgravity environment of the inside, cabin that falls, and its Level of Microgravity 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 ₀for earth surface acceleration of gravity.

The accompanying drawing explanation

Fig. 1 is that the fall Level of Microgravity in tower or the well equipment decline cabin that falls improves the apparatus structure schematic diagram.

Embodiment

When experiment with falling objects is carried out on the ground in the cabin 1 that falls, utilize accelerometer 2 (need be placed on the barycenter in cabin to accelerometer to reduce the impact of fall cabin rotation or vibration, can place a plurality of accelerometer measures cabin attitude that falls simultaneously) measure the remaining disturbance acceleration (mainly be air damping) of cabin in the freely falling body process, and 3 the input signal using measurement result as controller, after the processing of controller 3, obtain feedback control signal, this signal power that imposes on carries out machine or thruster 4 (mainly is placed on vertical falling direction, also can carry out attitude compensation and control at fall a plurality of power execution machines of other local placements of cabin or thruster), power carries out machine or thruster 4 produces thrust 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 microgravity environment of the inside, cabin that falls by this device, improve its Level of Microgravity, be expected to reach 10 ^-6～10 ^-8g ₀.

Claims (3)

1. the Level of Microgravity in tower or the well equipment decline cabin that falls of falling improves device, comprises

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

Accelerometer (2), for measuring the remaining disturbance acceleration in the described cabin (1) that falls;

Controller (3), process and obtain the close-loop feedback control signal for the remaining disturbance acceleration that described accelerometer (2) is measured;

Thruster (4), for producing thrust under controlling in described close-loop feedback control signal in the described cabin (1) that falls, make the described cabin (1) that falls overcome the remaining disturbance of external environment.

2. the Level of Microgravity that falls tower or the well equipment decline cabin that falls according to claim 1 improves device, it is characterized in that, described accelerometer (2) is one, is placed in the barycenter in the described cabin (1) that falls.

3. the Level of Microgravity that falls tower or the well equipment decline cabin that falls according to claim 1 improves device, it is characterized in that, described accelerometer (2) is a plurality of, and one of them is placed in the barycenter in the described cabin (1) that falls, the position beyond other the barycenter that is distributed in the described cabin (1) that falls.

Images