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Effect of Increasing Spring Stiffness in a Hartnell Governor:
Increasing the stiffness of the spring in a Hartnell governor will have a significant impact on its operation and performance.
1. Become more sensitive:
- When the spring stiffness is increased, the governor becomes more responsive to changes in speed.
- This increased sensitivity allows the governor to quickly adjust and maintain the desired speed, making it more efficient in regulating the engine.
2. Become less sensitive:
- Contrary to common belief, increasing the spring stiffness in a Hartnell governor does not make it less sensitive.
- Instead, it enhances the governor's ability to respond promptly to speed variations, ensuring better control over the engine's speed.
3. Remain unaffected as far as sensitivity is concerned:
- The sensitivity of a Hartnell governor is directly related to the spring stiffness and the centrifugal force acting on the balls.
- Increasing the spring stiffness improves the governor's sensitivity without compromising its overall performance.
4. Start hunting:
- If the spring stiffness is drastically increased beyond a certain point, the governor may start hunting.
- Hunting refers to the erratic oscillations of the governor due to excessive stiffness, leading to instability in speed regulation.
5. Become isochronous:
- In some cases, increasing the spring stiffness in a Hartnell governor can help achieve isochronous operation.
- Isochronous operation means maintaining a constant speed regardless of the load variations, which is ideal for certain applications requiring precise speed control.
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