Euler vs. Tait (steady precession vs... what?)

In summary, the two general approaches for studying body rotations are Euler angles and Tait-Bryan angles. The main difference is that Tait-Bryan angles represent rotations about three distinct axes while Euler angles use the same axis for both the first and third elemental rotations. In Tait-Bryan angles, the analogous case to steady precession in Euler angles is called "Steady Turn" or "Constant Turn." This refers to a scenario where the yaw rate is constant, the pitch rate is zero, and the roll rate is constant, with the object being banked or tilted to one side.
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TL;DR Summary
what is the analogue of steady precession when using the Tait -Bryan angles
Good Morning

When one studies body rotations, there are two general approaches one uses: Euler Angles vs. Tait-Bryan Angles.

The significant difference is that:
  • Tait–Bryan angles represent rotations about three distinct axes (e.g. x-y-z, or x-y′-z″): Yaw, Pitch, Roll
  • Euler angles use the same axis for both the first and third elemental rotations (e.g., z-x-z, or z-x′-z″): Precession, Nutation, Spin

With Euler angles, there is a special case of STEADY PRECESSION: precession rate is constant, nutation rate is 0, spin rate is constant.

Is there a NAME for the analogous case, when modeling with Tait? Yaw rate is constant, pitch rate is 0, roll rate is constant?
 
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Yes, there is a name for the analogous case in Tait-Bryan angles. It's called "Steady Turn," also known as "Constant Turn" or "Banked Turn." In this case, the yaw rate is constant, the pitch rate is zero, and the roll rate is constant. The term "banked turn" refers to the fact that the vehicle or object is banked or tilted to one side, like an airplane during a turn. This term is commonly used in aviation and aerospace engineering.
 
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1. What is the difference between Euler and Tait's theories?

Euler and Tait's theories both describe the motion of a spinning object, but they differ in their approach to explaining the phenomenon of precession. Euler's theory focuses on steady precession, where the axis of rotation remains fixed, while Tait's theory addresses precession with a changing axis of rotation.

2. Which theory is more widely accepted in the scientific community?

Both Euler and Tait's theories have been widely studied and accepted in the scientific community. However, Euler's theory is more commonly used in engineering and physics applications, while Tait's theory is often used in geophysics and astronomy.

3. What are the main assumptions of Euler's theory?

Euler's theory assumes that the spinning object is rigid, has a fixed axis of rotation, and is subject to a constant torque. It also assumes that the precession is steady and that there is no external force acting on the object.

4. How does Tait's theory account for a changing axis of rotation?

Tait's theory takes into account the effects of external forces on the spinning object, such as the Earth's gravitational pull. These forces can cause the axis of rotation to change over time, leading to precession with a varying axis.

5. Can both theories be applied to all spinning objects?

Both Euler and Tait's theories can be applied to most spinning objects, such as tops, gyroscopes, and planets. However, they may not accurately describe the motion of objects with irregular shapes or those subject to extreme external forces.

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