IRS (AE og kafli 19)

Question 1

nefndu tvennt sem IRS hefur fram yfir INS og eitt sem er verra.

Answer 1

Betra: Shorter spin up time, more reliable
Verra: suffers laser lock.

Question 2

An IRS consists of a ___, generating two _____.

Answer 2

Laser, light waves

Question 3

IRS measures rotation motion about sensitive axis. Measures ____ and angular ____.

Answer 3

measures accelerations and angular rates.

Question 4

Til að koma í vegn fyrir lock-in (sem getur gerst í low input rotation) í IRS kerfi þá er notuð aðferð sem kallast

Answer 4

Dithering

Question 5

Í IRS, eru accelerometers og platform strapped down?

Answer 5

já

Question 6

Alignment of an IRS consists of searching for the local ___, searching for true north, searching for the ___tude, comparison between the computed ___tude and the one entered by the pilot

Answer 6

vertical, latitude, latitude

Question 7

Output data of an IRS is..

a) satellite number
b) Mach number
c) GS
d) true track

Answer 7

c) GS

d) true track

Question 8

Hvaða mode selectors eru í boði í IRS frá vinstri til hægri?

Answer 8

OFF - ALIGN - NAV - ATT

Question 9

Output úr Accelerometers í INS/IRS er integreitað einu sinni til að fá X og tvisvar til að fá Y.

Answer 9

X: Velocity (til að reikna velocity þarftu held ég initial speed)
Y: Distance (til að reikna distance þá þarftu held ég initial distance).

Question 10

Strapdown IRS mælir hvað? (tveir hlutir)

Answer 10

Accelerations og Angular rate.

Question 11

Hvað er strap down system?

Answer 11

Gyros og accelerometers are a part of the units fixture to the aircraft structure.

Question 12

A ring laser gyro can measure rotation about it’s

Answer 12

sensitive axis

Question 13

The alignment of a strapdown inertial system consists in measuring the _____ and local gravitation to position the reference ____.

Answer 13

earth rotation, trihedron.

Question 14

In an IRS, accelerations are measured in relation to the ____.

Answer 14

aircraft axis.

Question 15

Þegar þú ert í mid-latitudes, getur þú alignað INS/IRS í bæði ALIGN og NAV mode?

Answer 15

já

Question 16

Eru accelerometers/gyroscopes/flow inductors að taka þátt í local vertical alignment of an inertial strap-down unit?

Answer 16

accelerometers

Question 17

A laser gyro can measure

Answer 17

rotation motion.

Question 18

Alignment time at mid latitudes for an inertial reference system using laser ring gyros is approx.

Answer 18

10 minutes. INS tekur 20 mín.

5 min at equator, 17 minutes 70°N - 78°N

Question 19

A laser gyro can measure

a) rotation
b) acceleration
c) both

Answer 19

a) rotation

Question 20

Hvað tekur alignment time í mid latitudes langan tíma fyrir IRS?

Answer 20

10 mínútur

Question 21

Dither is used in a laser gyro in order to:

a. enhance the accuracy of the gyro at all rotational rates
b. increase the maximum rotational rate that can be sensed by the gyro
c. stabilize the laser frequencies at peak power output
d. break the frequency lock which would prevent small rotational rates from being sensed by the gyro

Answer 21

d. break the frequency lock which would prevent small rotational rates from being sensed by the gyro

Question 22

The IRS can be a central source of information for which of an aircraft’s other systems?

1. stability augmentation system
2. weather radar
3. air conditioning
4. anti-skid auto brake system
5. hydraulic accumulators
6. vertical speed indication

Answer 22

1. stability augmentation system
2. weather radar
3. anti-skid auto brake system
4. vertical speed indication

Question 23

Which facilities of an IRS were not normally available from the earlier INS?

a. pitch and roll
b. windspeed and drift
c. true heading and groundspeed
d. magnetic data base and a vertical channel

Answer 23

d. magnetic data base and a vertical channel

Question 24

What of the following are the inputs required for an IRS?

1. 3 ring laser gyros
2. radio height
3. 3 inertial accelerometers
4. VHF communications
5. initial present position
6. barometric altitude
7. TAS

Answer 24

1. 3 ring laser gyros
2. 3 inertial accelerometers
3. initial present position
4. barometric altitude
5. TAS