Topic
Active vibration control
About: Active vibration control is a research topic. Over the lifetime, 6770 publications have been published within this topic receiving 76599 citations. The topic is also known as: active vibration damping.
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Patent•
24 Mar 1993
TL;DR: In this paper, the authors propose to reduce an arithmetic quantity and travel vibration by weighting plural pieces of travel vibration information as specified in advance and performing arithmetic operation for generating a control signal according to the respective pieces of specifically weighted travel vibrations information.
Abstract: PURPOSE: To effectively reduce an arithmetic quantity and travel vibration by weighting plural pieces of travel vibration information as specified in advance and performing arithmetic operation for generating a control signal according to the respective pieces of specifically weighted travel vibration information. CONSTITUTION: A 1st vibration detecting means 13 detects travel vibration information on wheels and a 2nd vibration detecting means 10 detects the travel vibration of the wheels at a specific position in the cabin. The output signals of those 1st and 2nd vibration detecting means 13 and 10 are inputted to a control means 25, which generates the control signal for reducing the travel vibration detected by the 2nd vibration detecting means 10 by the arithmetic operation. This control signal is inputted to a vibration generating means 11, which generates a noise; and this vibration and the travel vibration detected by the 1st vibration detecting means 13 cancel each other, and consequently the travel vibration detected by the 2nd vibration detecting means 10 at the specific position in the cabin is reduced, thereby obtaining reduction effects on the vehicle vibration. COPYRIGHT: (C)1994,JPO&Japio
48 citations
TL;DR: In this paper, the perturbation method is applied to a characteristic equation resulting in expressions for the derivatives of the pole eigenvalues with respect to the control gains and closed-loop sensitivities are expressed as linear functions of the control gain, thereby making accessible the assignment of the sensitivities to chosen values.
48 citations
TL;DR: In this article, a coupled piezoelectric circuit was proposed to solve the problem of small imperfections in a periodic structure, which could lead to large vibration in certain regions of the structure and could be harmful to the system.
Abstract: It is known that, when the mechanical coupling between the substructures is weak, small imperfections in a periodic structure can induce vibration localization. This phenomenon could lead to large vibration in certain regions of the structure and could be very harmful to the system. In this study, it is shown that the proposed coupled piezoelectric circuits can greatly relieve or even eliminate such localization problems. Part of the structural vibration energy will be transferred into electrical energy through the piezoelectric materials, and the newly created electro-mechanical wave/energy channel will sustain the energy propagation throughout the structure. The effectiveness and robustness of the coupled piezoelectric circuits on reducing vibration localization is demonstrated through analysis. Design guidelines are also established via approximation techniques and parametric studies.
48 citations
TL;DR: In this article, the authors proposed an optimized design of a voice coil motor (VCM) that can be used as an actuator to implement a suitable controller for active isolation using feedback control to attenuate the low frequency vibration of all six rigid body modes.
Abstract: To control the vibration transmitted from ground to the nano-precision measuring instruments has always been of great interest among the researchers. Vibration isolators typically reduce the vibration transmitted to the measuring instrument providing managed stiffness and damping through the transmitted path. Active isolators use control algorithms such as feedback or feed forward to provide the necessary control signal. In this paper, we propose optimized design of a voice coil motor (VCM) that can be used as an actuator to implement a suitable controller for active isolation using feedback control to attenuate the low frequency vibration of all six rigid body modes. Necessary force requirement has also been considered.
48 citations
TL;DR: In this article, an experimental setup consisting of a free-free uniform beam acted upon by four electromagnetic force actuators, with the motion being measured by nine displacement sensors, was designed to control the motion of a beam.
Abstract: This paper is concerned with an experiment conducted at the NASA Langley Research Center that was designed to control the motion of a beam. The experimental setup consists of a free-free uniform beam acted upon by four electromagnetic force actuators, with the motion being measured by nine displacement sensors. The entire assembly is linked to a digital computer permitting on-line real-time computation of the control forces. The control scheme is based on the independent modal-space control method in conjuction with a nonlinear, on-off control law for the modal forces. The actuator forces are then synthesized from the modal forces by means of a linear transformation, resulting in quantized forces. The sensors' data are processed by modal filters. It is observed that the independent controls are very effective in suppressing the motion of the beam, even though there is about a 50% difference between the actual and the analytically computed natural frequencies.
47 citations