RII Track-4:@NASA: Wind-induced noise in the prospective seismic data measured in the Venusian surface environment

RII Track-4：@NASA：金星表面环境中测量的预期地震数据中的风致噪声

• 批准号: 2327422
• 负责人: Il Sang Ahn
• 金额: $ 30万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-01-15 至 2025-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2327422&HistoricalAwards=false
• 关键词: RII; Track; NASA; Wind; induced

During the past 60 years of the nation’s space exploration, landers successfully touched down on the Moon, Mars, asteroid 433 Eros, and the Churyumov–Gerasimenko comet to collect data about their environment, structure, and history. In the future, more landers will be sent to other planetary bodies including Venus and will find themselves in a more hostile environment. While scientists and engineers have vigorously developed technologies for the Venus landers that can survive at a temperature of 450°C, a pressure of 90 bar, and an atmosphere filled with reactive gases, we still face technical challenges such as noise contamination in sensor signals. In particular, wind-induced noise (wind blows on Mars and Venus) in seismic data from seismometers has been a major concern from early Martian missions, and a similar issue is expected to occur in future Venus lander missions. We need reliable noise-cancelling techniques to hear clear seismic signal of Venus, which is a goal of this research. The research is designed to investigate nonlinear dynamic features in media that have natural discontinuities (such as cracks and gaps) under combined wind and seismic vibrations. In the case of nonlinearity in the natural ground of Venus, it is anticipated that the two vibrations can be coupled. The coupling of wind and seismic vibrations can generate significant interaction, which will be observed as wind-induced noises. The primary objective of the research is to acquire high-quality experiment data that can be used as hard evidence of nonlinear dynamic features. In the study of nonlinear dynamics where prediction based on theories usually fails, experimental data that reveal such complex behavior are critically important. Research activities are organized to collect seismic signals from a heat-shielded broadband seismometer on the simulated environment of the Venusian surface in the Venusian atmosphere. The NASA Glenn Research Center (GRC), the host institution, is equipped with the Glenn Extreme Environments Rig, where the Venusian atmospheric conditions can be accurately simulated. GRC is the best place to conduct this research, as it requires high precision simulation and measurement.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在过去60年的国家太空探索中，着陆器成功降落在月球，火星，小行星433爱神星和丘留莫夫-格拉西缅科彗星上，收集有关其环境，结构和历史的数据。未来，更多的着陆器将被送往包括金星在内的其他行星，并将发现自己处于更加恶劣的环境中。虽然科学家和工程师们大力开发了金星着陆器的技术，使其能够在450°C的温度，90 bar的压力和充满反应气体的大气中生存，但我们仍然面临着传感器信号中的噪声污染等技术挑战。特别是，来自地震仪的地震数据中的风引起的噪音（风吹在火星和金星上）一直是早期火星任务的主要关注点，预计未来的金星着陆器任务也会出现类似的问题。我们需要可靠的噪声消除技术来听到清晰的金星地震信号，这是本研究的目标之一。该研究旨在研究风和地震振动联合作用下具有天然不连续性（如裂缝和间隙）的介质中的非线性动力学特征。在金星自然地面的非线性情况下，预计两种振动可以耦合。风振和地震动的耦合作用会产生显著的相互作用，这种相互作用将被观测为风致噪声。研究的主要目的是获得高质量的实验数据，可以作为非线性动力学特性的铁证。在非线性动力学的研究中，基于理论的预测通常会失败，揭示这种复杂行为的实验数据至关重要。组织研究活动是为了在金星大气层中模拟金星表面环境，从隔热宽带地震仪收集地震信号。主办机构美国宇航局格伦研究中心（GRC）配备了格伦极端环境钻机，可以准确模拟金星的大气条件。GRC是进行这项研究的最佳场所，因为它需要高精度的模拟和测量。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。