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NASA installs new landing sensor components for Mars 2020 rover to improve safety

via:cnBeta.COM     time:2019/8/11 10:00:31     readed:144

medli2-install-1.jpg

The placement of an autonomous spacecraft in an alien world full of unknowns involves consideration of various factors at the landing site of the spacecraft and the performance of the spacecraft itself. Therefore, the landing task has a large error built in. Specifications must be over-engineered, the system is doubled or even tripled, and the landing area is defined as being safely landed on a relatively safe area.

“The uncertainty in our ability to simulate and predict the performance of incoming vehicles and associated thermal protection systems means that we need to include a large amount of difference (100% to 200%) in our forecasts to ensure that the entry vehicle can survive in the worst conditions. “MEDLI2 project manager Henry Wright said. “Flight data will allow the uncertainty in the model to be further reduced to more accurately predict load and performance.”

The original MEDLI was used in the mission of the Mars Science Laboratory to send the Curiosity Mars to the surface of Mars. The more advanced MEDLI2 package consists of three types of sensors - thermocouples, heat flux sensors and pressure sensors. They input data acquisition and signal conditioning sensor support electronics to record calorie and pressure data measured during atmospheric entry and parachute deployment. Unlike previous versions, MEDLI2 includes sensors connected to aeroshell and a heat shield.

The idea is that the instrument will begin collecting data five hours before the Mars 2020 Mars enters the red planet's atmosphere at a speed of about 12,500 mph (20,120 km/h). They will continue to do so during entry, descent and parachute deployments, which takes approximately six minutes. At this point, the aircraft will drop at a rate of 2 miles per hour.

It is hoped that this new data will enable engineers and mission planners to create lighter sun visors for the next lander, which will allow for heavier scientific payloads. In addition, the task is allowed to explore more interesting areas. So far, MEDLI2 has completed vibration and thermal vacuum testing at NASA's Langley Research Center in Hampton, Virginia. In addition, the hardware has passed the high temperaturedisinfectionTo ensure that the lander has a very low probability of contaminating Mars and its terrestrial microorganisms.

NASA expects the installation work to be completed in November this year.

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