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34 Cards in this Set
- Front
- Back
Velocity
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-The result of acceleration when integrated, with respect to time
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Gyroscope
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-A mechanical device containing a spinning mass universally mounted so it can assume any position in space
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Gyrosope components
-Rotor |
-A heavy wheel mounted so its spin axis is free to turn in any direction and can assume any position in space
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Rigidity
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-The ability of a gyro to keep its axis fixed in space
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Factors effecting Rigidity
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-Rotor Weight
-Weight Distribution -Rotor Spin Speed |
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Precession
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-The rotation of the spin access of a gyro in response to an attempt to move its spin access
-The direction of precession is always PERPENDICULAR to the direction of the applied force |
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The direction of precession will be 90 degrees... and...
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-clockwise from the applied force if the rotor is spinning clockwise
-counterclockwise if the rotor is spinning counterclockwise |
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Forefinger points in direction of...
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-spin vector
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Degrees of freedom
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-number of axiis the rotor is free to precess
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A gyroscope with 2 gimbil rings has... and is considered...
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-2 degrees of freedom
-universally mounted |
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Newton's 2nd Law
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-Acceleration is proportional to the resultant force and is in the same direction as this force
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The purpose of an INS
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-to keep track of present position
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The INS continuously measures aircraft accelerations to compute...
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-Aircraft velocity and change in present position
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INS measurements are made by...
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-precision inertial devices mounted on a 3-axis stable element which is part of a 4 gimbil structure
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Acceleration due to gravity can be eliminated by placing the...
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-accelerometer on the 3-axis stable platform
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Alpha Angle
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-Alpha is the angular difference between Platform Heading and True North
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Schular Tuning
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-The method used to maintain the stable platform in a horizontal position relative to the Earth's surface
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Kalman Filtering
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-The method used to align an INS
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INS outputs
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-Pitch
-Heading -Acceleration |
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Power Supply
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-Provides regulated and unregulated operating voltages
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Platform Assembly
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-Provides sensors to detect aircraft acceleration and altitude
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Platform components
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-4 Gimbils
-3 Accelerometers -2 Gyros |
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Digital Computer
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-A GENERAL PURPOSE 24-BIT PARALLEL FRACTIONAL MACHINE used to perform integration of platform signals to obtain aircraft velocity, distance traveled, and THE MONITORING OF SYSTEM DISCRETES FOR MALFUNCTION DISPLAY
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Air Data Computer
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-Provides barometric altitude, true air speed, and magnetic heading to INV
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Mission Computer
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-Performs user input of present position, elevation, and magnetic variation data to the INS
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Gyro Bias
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-The on-aircraft calibration mode for INS
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INS Mode Switch - GND
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-WP6 P2
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Setting the INS mode switch to any operating mode produces an... which initiates the...
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-on/off discreet
-turn on sequence |
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GND Alignment PUB location
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-WP12 P2 Para4
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Ground Alignment starts when the INS switch is set to...
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-GND
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After reset...
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-the digital computer initializes the program
-the platform is heated -the gyros are spun up -a COURSE LEVEL is performed |
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If the PARK BRK is not set...
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-The INS produces an aligned hold signal
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When the parking break is reset...
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-the INS waits 20 seconds for motion to stop and then continues the align sequence
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Alpha Angle is added with the platform heading to produce...
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-INS True Heading
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