The invention discloses an operating mechanism for liquid-nitrogen-cooled heat sinks in vacuum low-temperature environment The operating mechanism mainly consists of guide rail and supporting systems, driving systems, heat sink movable frameworks, heat sink liquid inlet hoses and heat sink liquid outlet hoses, wherein opening and closing movement of large-scaled movable heat sinks in the vacuum low-temperature environment is realized; a heat sink operating mechanism adopts an upper track driving manner, and is driven to operate by a step motor through a double-reduction gearbox; a motor, a driving device, a decelerator and a circular guide rail are all hung on the supporting system of a container, and the weight of the framework and the weight of the heat sinks are borne by an upper side guide rail According to the operating mechanism disclosed by the invention, the motion law of the heat sink movable frameworks adopts a trapezoid motion law of accelerating, decelerating and accelerating, so that the stage of starting and the stage of stopping have a good shock-absorbing property; and a long accelerating time and a long decelerating time exist in the whole operating process, so that the acceleration and a dynamic load of the operating mechanism are reduced when the operating mechanism is operated

Operating mechanism of liquid-nitrogen-cooled heat sinks in vacuum low-temperature environment

The present invention provides an adjustable diaphragm in a space environment. The adjustable diaphragm comprises two cold plates employing a two-way semi-circular structure; each cold plate comprises a substrate, a liquid nitrogen pipeline and a diaphragm installation support, wherein the size of the substrate is [Phi]2.7m and is calculated according to the size of the effective light spots of a solar simulator and the distance of the diaphragm relative to a collimating mirror, and different surfaces of the substrate have different emission rates according to the requirement; the liquid nitrogen pipeline is filled with flowing liquid nitrogen to cool the substrate to have the low temperature of lower than 100k, the liquid nitrogen pipeline is an internal pipeline reserved in the processing of the substrate, the diameter and the density of the pipeline are obtained according to the hot-fluid density supported by the diaphragm; and the diaphragm installation support provides support points and a rotation shaft for the diaphragm. The adjustable diaphragm in space environment ensures the heat sink coverage rate, and is opened at the period of requiring the irradiation of the solar simulator to permit the light ray of the solar simulator to pass through and filter the surrounding stray light.

Adjustable diaphragm in space environment

The invention relates to a multi-angle dynamic simulation test method and system of a geometric scene for spatial optical detection. The method comprises the steps that a three-dimensional motion simulator installed in a spherical container bears a target and simulate pitching, yawing and spinning posture motions of the target; a light radiation source installed at the top of the spherical container simulates light radiation in a space environment where the target is located; a measurement device installed on the meridian plane of the spherical container acquires multi-angle optical property data of the target, is installed on an all-around testing track of the meridian plane of the spherical container and moves in the meridian direction. The multi-angle optical property data of the targetis acquired through the light radiation source installed at the top of the spherical container, the three-dimensional motion simulator and the measurement device installed on the meridian plane of the spherical container, and multi-angle dynamic simulation of the geometric scene for spatial optical detection is achieved.

Multi-angle dynamic simulation test method and system of geometric scene for spatial optical detection

Momentum wheel component performance testing device

The invention discloses a motion simulator for simulation experiments on the target characteristic ground, in particular to a motion simulating mechanism for working in high vacuum and deep cooling environment. The invention achieves the simulation of different relative positions of a target and a light source under different states in one experiment, and belongs to the field of motion simulators. The motion simulator for simulation experiments on the target characteristic ground comprises a supporting system, a motion system, a measurement and control system and an auxiliary system, wherein the motion system solves the problem of moving in different axial directions by adopting a plane four bar mechanism, an inner gearing incomplete gear mechanism and a symmetric axis automatically rotating mechanism; the supporting system comprises dismountable platforms which are arranged among different motion mechanisms and are respectively positioned at the connecting part of each discrete motion mechanism; and simultaneously, a fixed heat sink and a movable heat sink are used for shielding the influence of the motion simulator on target radiation, and all lubrication in the motion simulator adopts vacuum oil-free lubrication which can not bring pollution sources to the vacuum environment.

Motion simulator for simulation experiments on target characteristic ground

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Motion simulator for simulation experiments on target characteristic ground