Test device for simulating weightlessness ejection of cubesat

Abstract

The invention provides a test device for simulating the weightless ejection of a cubesat. With the device provided by the invention adopted, human influence can be avoided, a good initial state of a free falling body can be ensured, the synchronization of falling starting time of a catapult and the power-up time of the catapult can be ensured, or the time difference between the falling starting time and power-up starting time can be strictly controlled according to the power-up unfolding time of the catapult; meanwhile, when the catapult is unfolded and pops out of the cubesat, a Pod is restrained in a separation direction, so that it can be ensured that the ejection speed of the cubesat and a real in-orbit separation speed can be the same. The test device comprises a catapult, a vertical frame and a sliding rod installed in the frame, the catapult can be used for containing the cubesat and catapulting the cubesat, the catapult is installed on the sliding rod in a sliding mode through a sliding sleeve and is guided through the sliding rod; The test device further comprises an iron block installed at the top of the catapult, a suction cup magnet assembly capable of being attracted to the iron block is installed at the top of the frame, and the catapult is suspended at the top of the frame through attraction of the suction cup magnet assembly and the iron block.

Description

technical field [0001] The invention relates to the technical field of auxiliary devices for cubesat testing, in particular to a testing device for simulating weightless ejection of cubesats. Background technique [0002] At present, the in-orbit release of cubesats is usually achieved by a special catapult (Pod). The outside of the pod is fixed on the launch vehicle, and the inside of the pod can accommodate the cubesat and the spring energy storage unit. When the cubestar needs to be released, the Pod end cover is opened, and the cubestar is ejected under the release of the spring energy storage unit. Pods are comparable in volume and weight to cube stars. [0003] Since the CubeSat is released in orbit under the condition of vacuum weightlessness, in order to ensure the reliability of the catapult, it is necessary to conduct ground tests during the Pod development stage to test all aspects of the performance of the catapult. [0004] If the ejection test is carried out ...

AI Technical Summary

Problems solved by technology

[0006] 1. The initial attitude cannot be guaranteed: Due to human manipulation, the attitude level of the Pod when it starts to fall cannot be guaranteed, and even a small horizontal initial velocity may be artificially generated;

[0007] 2. It is difficult to guarantee the coordination time: because the design deployment time of the Pod is fixed, generally on the millisecond level, and the greater the height of the cubesat from the ground when it pops up, the farther the pop-up distance will be when it lands, and the higher the landing speed will be. Consider the test site And the safety of the equipment, the test height is generally about 2m, which requires that the Pod starts to fall and the Pod is powered on must be synchronized. Due to the limited ability of people to respond, it is easy to appear out of sync. Letting go too early may cause the Pod to fall before it lands. Opening, letting go too late may cause the pod to be ejected too high from the ground, and the device will land too fast, increasing the possibility of device damage;

[0009] To sum up, although the currently commonly used free-fall test of artificial hand throwing can simulate the condition of weightlessness, it cannot truly simulate the in-orbit ejection of the Pod.

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