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Modeling and Validation of Thermal Radiation Acceleration on Interplanetary Spacecraft

机译:行星际航天器热辐射加速的建模与验证

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摘要

Precise modeling of nonconservative forces is becoming increasingly important for deep-space and interplanetary missions, especially those with strict targeting requirements. Apparent errors in the solar radiation pressure model are often corrected with estimated scale factors in the orbit determination process. For example, several European Space Agency deep-space spacecraft have estimated solar radiation pressure scale factors between 1.05 and 1.15. This work shows that including separate thermal acceleration models can account for many of these apparent errors in the solar radiation pressure modeling. Using the Rosetta spacecraft as an example, a steady-state thermal model that is applicable to the cruise phases of interplanetary missions is described. The surface temperatures on the spacecraft body are solved in closed form, whereas those on the solar panel front and rear surfaces are solved with an iterative numerical procedure. The thermal model is validated by comparing the predicted thermal radiation acceleration with the remaining unmodeled acceleration extracted from the operational orbit estimates. The solar array temperatures from this model also agree with finite element method results and thermistor telemetry to within several degrees.
机译:非保守力量的精确建模对于深空和星际任务,尤其是具有严格目标要求的任务,变得越来越重要。太阳辐射压力模型中的表观误差通常在轨道确定过程中用估计的比例因子进行校正。例如,一些欧洲航天局的深空航天器估计太阳辐射压力比例因子在1.05和1.15之间。这项工作表明,在太阳辐射压力模型中,包括单独的热加速度模型可以解决许多这些明显的误差。以罗塞塔号飞船为例,描述了适用于星际飞行任务巡航阶段的稳态热模型。航天器主体上的表面温度以封闭形式求解,而太阳能电池板正面和背面的表面温度通过迭代数值程序求解。通过将预测的热辐射加速度与从运行轨道估算中提取的其余未建模加速度进行比较,可以验证热模型。该模型的太阳能电池阵列温度也与有限元方法结果和热敏电阻遥测结果相吻合,误差在几度以内。

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