We present an updated model for estimating the lander mechanical noise on the InSight seismometer SEIS, taking into account the flexible modes of the InSight lander. This new flexible mode model uses the Satellite Dynamics Toolbox to compute the direct and the inverse dynamic model of a satellite composed of a main body fitted with one or several dynamic appendages. Through a detailed study of the sensitivity of our results to key environment parameters we find that the frequencies of the six dominant lander resonant modes increase logarithmically with increasing ground stiffness. On the other hand, the wind strength and the incoming wind angle modify only the signal amplitude but not the frequencies of the resonances. For the baseline parameters chosen for this study, the lander mechanical noise on the SEIS instrument is not expected to exceed the instrument total noise requirements. However, in the case that the lander mechanical noise is observable in the seismic data acquired by SEIS, this may provide a complementary method for studying the ground and wind properties on Mars.

中文翻译：

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InSight 着陆器的灵活模式建模和 SEIS 仪器的后果

考虑到洞察号着陆器的灵活模式，我们提出了一个更新的模型，用于估计洞察号地震仪 SEIS 上的着陆器机械噪声。这种新的灵活模式模型使用卫星动力学工具箱来计算由装有一个或多个动态附件的主体组成的卫星的直接和逆动态模型。通过详细研究我们的结果对关键环境参数的敏感性，我们发现六种主要着陆器共振模式的频率随着地面刚度的增加呈对数增加。另一方面，风强度和来风角仅改变信号幅度，而不改变共振频率。对于本研究选择的基线参数，SEIS 仪器上的着陆器机械噪声预计不会超过仪器总噪声要求。然而，在SEIS采集的地震数据中可以观测到着陆器机械噪声的情况下，这可能为研究火星地​​面和风特性提供了一种补充方法。