AMB literature survey notes 0400:600

 18122025

1. When shaft stiffness is less than the bearing stiffness, equivalent stiffness is positive and the poles will occur in the stable complex pairs. This can be checked only with the integrated flexible model
2. Uses 5.15 to check the static values of rotational poles
3. Cant use 5.17 to check the rotating case. It is only for free free system.

Applications of modern gyro technology, The RAS , 12 Jan 1977

 The effect of modern tech on Gyros , S G Smith

Gyroscope can be strapped down gyro or gimbaled gyro

Strap down gyros are rigidly mounted to aircraft, it requires digital computers to solve for the roll

Accuracy requirement for gyros:

• 0.01° per hour drift is allowed in the presence fo  400° per sec rolls
• Dynamic range must be 1x10^8,no units given

Single axis rate sensor : Spring restrained, single gimbal mounted rotating wheel.

Types of rate sensors:

1. gyroscope
2. gas jet rate sensor
3. vibrating wire sensor
4. tuning fork
5. magneto hydrodynamic sensor

Gas jet rate:

• deflection of a laminar flow of gas when  the case of the instrument is rotated
• jet is maintained by the piezo pump
• gas jet rate is measured by hot wire
• extreme rugged ness, low cost
• major disadvantage: transit time of the gas causes low frequency of response
• has onlyt 0.1°/s sensitivity and 1% linearity