Mission Mars ENTRY, DESCENTAND LANDING

What are we going to Talk about? ?

History of Landers History of Landers

What are we going to Talk about? History of Landers History of Landers How do these Landers work? How do these Landers work?

What are we going to Talk about? History of Landers History of Landers How do these Landers work? How do these Landers work? Primary Lander Configuration Primary Lander Configuration

What are we going to Talk about? History of Landers History of Landers How Do these Landers work? How Do these Landers work? Primary Lander Configuration Primary Lander Configuration Emphasis on the Aero shell design, using MER. Emphasis on the Aero shell design, using MER.

History of Mars Landers SOVIET UNION SOVIET UNION Lander Aero shell Design Aero braking to 600 m/s Deployment of Parachutes Descent with Retro rockets Failure

History of Mars Landers United States United States Orbital Entry Aero shell Design Aero braking Parachute Deployment Retrorocket Soft landing on Legs( On Mission)

Science Behind the Landing Type of entry procedures Type of entry procedures 1. Ballistic Entry 2. Double Dip Entry 3. Aero – braking

Ballistic Method Thick Heat Shield Thick Heat Shield Steep angle of flight, greater deceleration with high accuracy. Steep angle of flight, greater deceleration with high accuracy. The disadvantage The disadvantage

Double Dip Method Double Dip entry, takes advantage of the lift of the vehicle to make two decelerating dips into the atmosphere Double Dip entry, takes advantage of the lift of the vehicle to make two decelerating dips into the atmosphere the heat transferred is more gradual, allowing the use of a thinner heat shield that relies on radiating the heat the heat transferred is more gradual, allowing the use of a thinner heat shield that relies on radiating the heat

Aero Braking Multiple passes through the atmosphere to gradually slow the vehicle. Multiple passes through the atmosphere to gradually slow the vehicle. the dynamic nature of planetary atmospheres, resulting in uncertainty about the state of the atmosphere at the time of entry. the dynamic nature of planetary atmospheres, resulting in uncertainty about the state of the atmosphere at the time of entry.

Entry Vehicle Aeroshell Aeroshell

Aeroshell

The Aeroshell Heat Shield Heat Shield The Backshell The Backshell

Heat Shield Protects the ship from intense heat from entry. Protects the ship from intense heat from entry.

Backshell a parachute (stowed at the top of the backshell) a parachute (stowed at the top of the backshell) an Inertial Measurement Unit (IMU) an Inertial Measurement Unit (IMU) three large solid rocket motors called RAD (Rocket Assisted Descent), three large solid rocket motors called RAD (Rocket Assisted Descent), three small solid rockets called TIRS three small solid rockets called TIRS

Composition of Backshell the aeroshell is made out of an aluminum honeycomb structure sandwiched between graphite-epoxy face sheets. the aeroshell is made out of an aluminum honeycomb structure sandwiched between graphite-epoxy face sheets. Outside covered with a layer of phenoic compound. Outside covered with a layer of phenoic compound.

Albator It is specially formulated to react chemically with the Martian atmosphere during entry and essentially take heat away, leaving a hot wake of gas behind the vehicle. It is specially formulated to react chemically with the Martian atmosphere during entry and essentially take heat away, leaving a hot wake of gas behind the vehicle. instead of being painted, the backshell will be covered with a very thin aluminized mylar blanket to protect it from the cold of deep space. instead of being painted, the backshell will be covered with a very thin aluminized mylar blanket to protect it from the cold of deep space.

I.M.U IMU Inertial Measurement Unit IMU Inertial Measurement Unit Northrop Grumman Northrop Grumman LN200S LN200S

Parachute Mission Requirements (Load) Mission Requirements (Load) System Composition System Composition System Operation System Operation (Automatic Deployment) (Automatic Deployment)

Rocket Assisted Descent Pathfinder Manufacture: Zirkol Pathfinder Manufacture: Zirkol MER Manufacturer MER Manufacturer ATK. ATK. 1 ton thrust in 3 sec 1 ton thrust in 3 sec feet feet atmospheric hover. atmospheric hover.

Transverse Impulse Rocket System Implementation: Implementation: Trajectory correction in flight during descent. Trajectory correction in flight during descent. ATK manufactured.

Airbags Robust Design Robust Design Multi-bladder Multi-bladder Material Material

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Questions Pics: Nasa.gov