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Thermal balance testing of the Envisat payload module

机译：envisat有效载荷模块的热平衡测试

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The Envisat spacecraft has a launch mass greater than 8.0 tons and external dimensions of 10.0 meters x 2.8 meters x 2.1 meters. Due to its large size, it was necessary to perform the thermal balance and thermal vacuum testing in two stages. Firstly, there was the testing of the Service Module and, secondly, the testing of the Payload Module (PLM). This paper discusses the thermal balance testing of the PLM. The PLM, itself, is 7.5 meters tall; too large to fit into a test facility solar beam. Originally, it was intended to conduct two solar beam tests; one for the upper part and the second for the lower part. Following a revision and re-scheduling within the program, it was decided to perform a single, non-solar beam, thermal balance test. The thermal balance test would be performed using test specific, electrical, heaters and test facility shroud control. The Envisat PLM supports a complement of 10 earth observation instruments and was successfully tested in July/August 1999 at the Large Space Simulator (LSS), at ESTEC, The Netherlands. The objectives of the thermal balance test were to provide correlation data for the thermal mathematical models and to demonstrate the Thermal Control Subsystem (TCS) performance. Test data, taken from the test, is compared with the test predictions and a correlation performed. The resultant thermal model will be utilized to provide the final flight predictions. The paper outlines the rationale behind the selection and definition of the test, discusses technical aspects of the test set-up and shows the achieved, thermal mathematical model, correlation.
机译：Envisat SpaceCraft的发射质量大于8.0吨，外部尺寸为10.0米x 2.8米x 2.1米。由于其尺寸大，有必要在两个阶段进行热平衡和热真空测试。首先，存在对服务模块的测试，其次，测试有效载荷模块（PLM）。本文讨论了PLM的热平衡测试。 PLM本身，高7.5米;太大，无法适合测试设施太阳束。最初，它旨在进行两个太阳梁测试;一个用于上部和下部的第二部分。在程序中修订并重新调度后，决定执行单个非太阳束，热平衡测试。热平衡测试将使用测试特异性，电气，加热器和测试设施护罩控制进行。 Envisat PLM支持10个地球观测仪器的补充，并于1999年7月/ 8月在荷兰Estec的大型空间模拟器（LSS）成功测试。热平衡测试的目的是为热数学模型提供相关数据，并展示热控制子系统（TCS）性能。从测试中获取的测试数据与测试预测和执行的相关性进行比较。所得到的热模型将用于提供最终的飞行预测。本文概述了测试的选择和定义背后的理由，讨论了测试设置的技术方面，并显示了实现，热数学模型，相关性。

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