Wave-absorbing device with high temperature-low temperature simulation capability

Abstract

The invention discloses a wave-absorbing device with a high temperature-low temperature simulation capability, mainly including a wave-absorbing wedge, a wedge installation substrate, an electric heater unit, a sealing plate, a liquid nitrogen outlet pipeline, a sealing nut, a liquid nitrogen inlet pipeline and a metal sealing ring. The front surface of the installation substrate is provided with wedges distributed in an array mode. The back surface of the installation substrate is provided with a liquid nitrogen channel, the outer side of the channel is provided with a groove of a diameter as same as that of a heating rod, the electric heater unit is embedded in the groove, the sealing plate is welded on the outer side of the channel of the back surface, and the channel forms a closed space. The liquid nitrogen outlet pipeline and the liquid nitrogen inlet pipeline are installed at two ends of the liquid nitrogen channel, so that the liquid nitrogen flows from the liquid nitrogen inlet pipeline through the channel and out of the liquid nitrogen outlet pipeline. The invention can obviously improve the authenticity of the external heat flow simulation of the antenna during the vacuum thermal test, improve the effectiveness of the thermal test verification and provide the hot and cold simulation environment.

Description

technical field [0001] The invention belongs to the technical field of spacecraft ground thermal tests, and in particular relates to a wave-absorbing device with high-temperature-low-temperature simulation capability for spacecraft thermal tests. Background technique [0002] Before the spacecraft is launched, it is necessary to conduct a space environment simulation test on the spacecraft on the ground to verify the reliability of the spacecraft's in-orbit operation, and the vacuum thermal test is an important part of the spacecraft environmental test. In the vacuum thermal environment test of some communication satellites, the main load antenna needs to be modified to adapt to the vacuum thermal test state before the vacuum thermal test, and then restored after the test is over. During this process, the components of the antenna need to be modified. In particular, the cables of the antenna are plugged and unplugged multiple times. In this process, the plugging status of th...

AI Technical Summary

Problems solved by technology

In the vacuum thermal environment test of some communication satellites, the main load antenna needs to be modified to adapt to the vacuum thermal test state before the vacuum thermal test, and then restored after the test is over. During this process, the components of the antenna need to be modified. In particular, the cables of the antenna are plugged and unplugged multiple times. In this process, the plugging status of the modified antenna cables is likely to be inconsistent with the status during the test process, which cannot effectively verify the communication performance of the satellite in a vacuum and low temperature environment.

[0003] During the routine thermal test of communication satellites, the microwaves emitted by the antenna are absorbed by a special load. During the process of absorbing microwaves, the temperature of the load will rise. Generally, circulating water is used for cooling. The introduction of a new system complicates the test process and increases the risk of the test; the emergence of a new type of silicon carbide ceramic wedge-shaped absorbing box solves the problem of microwave absorption during the thermal test, but due to the The wave box is generally designed as an enveloping type. The existence of the wave absorbing box blocks the heat exchange between the antenna and the heat sink, which is very unfavorable for the antenna test under low temperature conditions. Microwave, its own temperature is also rising continuously, and it is also distributed around the antenna as a huge heat source, which is also very unfavorable to the cooling of the antenna

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