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Showing 1 to 20 of 28 for “"Vibration Absorbers"”.
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A Study of Distributed Active Vibration Absorbers (DAVA)
DAVAs are distributed active and passive devices that can be numerically modelled to provide optimum control of low frequency (< 1000 Hz) mean square velocity and sound power radiation. A numerical model of a multi-DAVA system was developed using the Rayleigh-Ritz method coupled to a hierarchical …
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Nonlinear vibrations: a comparative study with applications to centrifugal pendulum vibration absorbers ; Nonlinear aspects of the performance of centrifugal pendulum vibration absorbers
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1963.
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A Hierarchical Noise Control System Using Adaptable Tuned Vibration Absorbers
… system is developed using adaptable tuned vibration absorbers (ATVA) to interact with a vibrating host structure in such a way as to reduce radiated acoustic energy. ATVA's are single-degree-of-freedom resonant devices that can change their resonant frequency and damping over a range. This …
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Vibration analysis of a beam structure attached with two dynamic vibration absorbers
… load primarily in flexure that may experience vibration as it does carry vertical loads and gravitational forces. Its exposure to vibration can lead to excessive deflections and failure of to the structure. The aim of this research is to develop the application of dynamic vibration absorber on …
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Using Magneto-Rheological Dampers in Semiactive Tuned Vibration Absorbers to Control Structural Vibrations
Since their invention in the early 1900s, Tuned Vibration Absorbers (TVAs) have shown to be effective in suppressing vibrations of machines and structures. A vibration absorber is a vibratory subsystem attached to a primary system. It normally consists of a mass, a spring, and a damper. Mounted to …
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Control of sound transmission into payload fairings using distributed vibration absorbers and Helmholtz resonators
… new solution is composed of optimally damped vibration absorbers (DVA) and optimally damped Helmholtz resonators (HR). A fully coupled structural-acoustic model of a composite cylinder excited by an external plane wave is developed as a first approximation of the system. A modal expansion …
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Multi-Degree of Freedom Passive and Active Vibration Absorbers for the Control of Structural Vibration
… of freedom (MDOF) passive and active vibration absorbers for the control of structural vibration as an improvement to conventional single degree of freedom (SDOF) vibration absorbers. An analytical model is first used to compare passive two degree of freedom (2DOF) absorbers to SDOF …
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Internal Resonances in Vibration Isolators and Their Control Using Passive and Hybrid Dynamic Vibration Absorbers
… they only discussed this problem in terms of vibration based on single degree-of-freedom (SDOF) models. These studies did not reveal the importance of the IRs, especially from the perspective of the noise radiation. This dissertation is novel compared to previous studies in the following ways: …
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Utilizing Distributed Vibration Absorbers to Reduce Noise Transmission Through the Windshield of a Cessna 150
… contradicts the original assumption that engine vibration contributed to large noise transmission into the cabin of the aircraft via the firewall. Airborne noise and some exhaust noise transmit through the firewall, but not near as much as noise that transmits through the windshield. Reducing …
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Performance of Nonlinear Mechanical, Resonant-Shunted Piezoelectric, and Electronic Vibration Absorbers for Multi-Degree-of-Freedom Structures
Linear vibration absorbers are a valuable tool used to suppress vibrations due to harmonic excitation in structural systems. Limited evaluation of the performance of nonlinear vibration absorbers for nonlinear structures exists in the current literature. The state of the art is extended in this …
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Design and development of advanced vibration and noise control devices using finite element analysis
… Numerous experiments conducted on the advanced vibration absorbers such as the distributed vibration absorbers (DVA's) and the heterogeneous blankets (HG blankets) have shown great potential in reducing the vibration levels and the SPL's inside the payload fairings. Despite their good …
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Computer-Aided Design Software for Torsional Analysis
… mass, viscous and structural damping, vibration absorbers, and gear meshes with gear tooth flexibility. The analysis capabilities of the program include forcedresponse and free-vibration analyses. The forced-response analysis module is capable of determining a system’s response to a …
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Design methodologies for controlling vibrations in buildings
Although vibration absorbers have been employed in mechanical equipment mounting for over 100 years, they have only recently been used for isolating large-scale structures such as bridges and buildings. Their applications range from acoustic to seismic isolation of structures. Virtually any …
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The Uniformly Tapered Circular Beam as a Dynamic Vibration Absorber.
… treat in detail the lumped parameter dynamic vibration absorber. Typical examples are the translating mass vibration absorber, the pendulum vibration absorber, and the bifilar pendulum vibration absorber. The common characteristic of these single degree-of-freedom subsystems is that their …
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Modeling a Semi-Submersible Floating Offshore Wind Turbine With Tuned Inerter Dampers Within the Platform
… arguably better performance than traditional vibration absorbers, and the configuration proposed in this paper also offers the ability to use a generator as an element in the structural controller. This allows extra energy to be generated along with the improvement in vibration absorption. …
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Vibration suppression in finite length marine cable systems
The vibration suppression effectiveness of a flexible in-line marine cable vibration absorber is studied. The transfer matrix method is used to build various numerical models of vibration absorbers in marine cable systems. The models determine cable system natural frequencies, mode shapes and modal …
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Novel Lightweight Noise and Vibration Control Treatments for Marine Structures
… the development and testing of distributed vibration absorber designs with specific application to heavy plates for the reduction of vibration and sound radiation. Two particular designs, already under investigation for use on thin panels or composite materials, were adapted to passively …
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Acoustic prediction and noise control of a refrigeration compressor
… to various locations on the shell, (b) dynamic vibration absorbers (DVAs) are added to the mounts, and (c) low modulus materials are inserted between the mounts and the springs to create an impedance mismatch. For all three approaches, efficient analytical methods to compute the radiated …
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Investigation of a Mobile Damping Robot for Electric Transmission Lines
… suffer from many hazards, including wind-induced vibrations (WIV), which can lead to fatigue failure of the transmission conductors. Current vibration mitigation methods do not adequately address WIV because they overwhelmingly rely on narrow-band fixed absorbers. A mobile damping robot (MDR) can …
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