| Autor: |
Sahu, Govind N., Deora, Pankaj, Law, Mohit, Wahi, Pankaj |
| Předmět: |
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| Zdroj: |
Journal of Vibration Engineering & Technologies; Oct2022, Vol. 10 Issue 7, p2799-2808, 10p |
| Abstrakt: |
Purpose: Chatter can damage parts. It must hence be avoided and/or suppressed. This paper discusses the use of active vibration control to suppress chatter in a milling process. To apply only as much force as is necessary to stabilize the process, a novel adaptive and model-free gain tuning method is proposed in which gains are adapted to the level of unstable vibrations detected during machining. Methods: Vibrations during the cutting process are monitored using an accelerometer. If/when instabilities are detected, an active damper that is mounted on a flexure is supplied an appropriate control signal based on a velocity feedback control law. The actuator then applies a suitable compensatory force on the flexure to damp the vibrations. Since the amount of force to be applied is governed by the actuator type and by the level of instability detected, efficacy of proposed adaptive gain tuning scheme is tested for its dependence on the time required to update the gain and for its dependence on the levels of gain increments. Results: For slot milling of steel, active damping of unstable vibrations is shown to stabilize the process and improve productivity by up to ~ 300%. With the adaptive gain tuning scheme, higher gain increments with shorter updating times are observed to result in the process being stabilized quicker. Conclusions: Since the proposed scheme is model-free and much simpler to implement than other previous adaptive gain updating schemes found in the literature, and efficacy of the scheme is demonstrated experimentally, it has great potential for industrial use. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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