Dynamic Vibration Absorber

About: Dynamic Vibration Absorber is a research topic. Over the lifetime, 4764 publications have been published within this topic receiving 49429 citations.

Gun barrel vibration absorber

Abstract: A weapon system includes a gun barrel and a vibration absorber fitted onto a free end of the gun barrel. The vibration absorber includes a compliant energy storage device, such as a spring, and a mass secured to the energy storage device. The potential energy stored in the spring and the kinetic energy stored in the mass inertia are dissipated in part as friction, and re-introduced in part to the gun barrel such that the re-introduced energy is out of phase relative to the gun barrel motion. As a result, the vibration absorber does not totally dissipate the stored energy, but rather reshapes the receptance of the gun system so as to significantly reduce the vibration energy that migrates into the gun structure from known disturbances. This improves the overall accuracy of the gun system. In addition, the vibration absorber reduces the load between the gun barrel and the projectile during launch, thereby reducing the gun barrel muzzle wear and the exit yaw rate of the projectile.

Identification and Retuning of Optimum Delayed Feedback Vibration Absorber

Abstract: A recursive system identification and retuning methodology is presented for a recently developed delayed feedback vibration absorber. The retuning is needed against the parametric variations in the system. It is performed to maintain optimal vibration suppression properties for wideband excitations. The optimized absorber offers minimum peak frequency response within the given wideband frequency range. A new scheme is introduced for the tuning of the absorber as the system experiences structural variations. The scheme suggests a nested procedure of two optimization steps, one for identification and the other for control. Feasibility of the proposed methodology is demonstrated through simulations. One of the examples deals with a single-degree-of-freedom system, and the second one is for a two-degree-of-freedom setting. Results show that with only three iterations used for the first example and five iterations used for the second example in the parameter identification part of the process, the frequency response peaks are reduced by 25%.

Active vibration absorber and method

Abstract: An active vibration absorber is provided for absorbing vibrations in a member (21). An inertial mass (22) is mounted on the member with a stiffness (24) between the member and the mass. A force actuator arrangement (23) applies a force between the inertial mass and the member. A damping arrangement provides for damping of a resonance of the active vibration absorber. A first sensor arrangement (29) provides at least one first signal indicative of at least one movement and/or stress related parameter for the member and a second sensor arrangement (25) provides for at least one second signal indicative of a reaction of the inertial mass. A control arrangement (30) is provided for controlling the force actuator arrangement using the at least one first signal and the at least one second signal.