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Showing 1 to 20 of 71 for “"vibration isolation"”.
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Active vibration isolation for flexible payloads
… a flexible payload to low frequency sinusoidal vibration disturbances, (2) damp the transient response of a flexible payload to step disturbances, and (3) eliminate isolator static deflections under conditions of gradually changing steady acceleration levels. An active vibration isolation system …
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Active vibration isolation for controlled flexible structures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Active vibration isolation for precision space structures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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Experimental testing of LIGO vibration isolation system
… will be achieved in part by improved seismic isolation one component of which is an active vibration isolation platform. Currently, research and development is being conducted at MIT on a prototype of this vibration isolation system. The work described in this thesis focuses on the Internal …
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Dynamics and Control for Vibration Isolation Design
… (SDOF) system is the most widely used model for vibration isolation systems. The SDOF system is a simple but worthy model because it quantifies many results of an isolation system. For instance, a SDOF model predicts that the high frequency transmissibility increases when the isolator has passive …
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A substructure synthesis formulation for vibration isolation
… stiffness of the structure. This increases the isolation between substructures. The ability to improve isolation using this unique type of feedback is demonstrated. The concept of structural modification through substructure constraint alteration 1s applied to systems using a multivariable …
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Active vibration isolation with a distributed parameter isolator
Conventional vibration isolators are usually assumed to be massless for the purpose of modelling. This simplification tends to overestimate the isolator performance because of neglecting the internal resonances (IRs) due to the distributed mass effects in the isolator, which is especially important …
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Development of Magnetorheological Elastomer System for Adaptive Vibration Isolation
ABSTRACT: This main objective of this study was focused on a proof-of-concept study of the performance of an adaptive bearing (AB) system under traffic and wind loadings, featuring magnetorheological elastomers (MREs). MREs were utilized to generate adaptability (variable stiffness) to the AB …
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A low cost, DC-coupled active vibration isolation system
In this thesis, I designed and implemented an isolation system that interfaces with traditional air mounts for improved force disturbance rejection relative to passive optical tables.Force disturbance rejection and position alignment are two major functional requirements of vibration isolation …
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Active microgravity vibration isolation using PVDF polymer piezoelectric actuators
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Semi-active damping control for vibration isolation of base disturbances
… concerned with semi-active damping control for vibration isolation of base disturbances. The aim is to investigate the effectiveness and suitability of semi-active damping control strategies for improving steady-state vibration isolation. A single-degree-of-freedom (SDOF) system, comprising a …
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Vibration isolation systems using hysteretic multiple tuned mass damper oscillators
The subject of this study is the vibration isolation effect of linear and nonlinear hysteretic single degree of freedom oscillators attached to a structure. The system of oscillators, attached to the main structure, reduce the amplitude of its structural response, over a wide frequency band …
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Element and system design for active and passive vibration isolation
This thesis focusses on broadband vibration isolation, with an emphasis on control of absolute payload motion for ultra-precision instruments such as the MIT/Caltech Laser-Interferometric Gravitational Wave Observatory (LIGO), which is designed to measure spatial strains on the order of 10-²¹. We …
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Application of adaptive trusses to vibration isolation in flexible structures
… techniques for using adaptive trusses for active vibration isolation in flexible structures. Passive methods have been used almost exclusively in the past for vibration isolation, although in the more recent literature active techniques have been proposed in an attempt to achieve greater isolation …
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A Single-Stage Passive Vibration Isolation System for Scanning Tunneling Microscopy
… surface, the device is prone to noises due to vibrations from the surroundings. To minimize the random noises and floor vibrations, passive vibration isolation is a commonly used technique due to its low cost and simpler design compared to active vibration isolation, especially when the entire …
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Active narrow band vibration isolation of machinery noise from resonant substructures
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Adjustable Frequency Bandgap for Seismic Vibration Isolation of MRE-Based Metamaterial Foundations
… of their geological variations. The seismic vibration caused by earthquakes can damage the structure, leaving it unrectifiable and unusable. Different types of seismic isolation are used underneath the structure to prevent the structure from seismic damage. Conventional seismic isolators will …
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Vibration Isolation of a Horizontal Rigid Plate Supported by Pre-bent Struts
… of this research is to analyze a new type of vibration isolator consisting of two pre-bent struts which are clamped at both ends and intermediately bonded with a viscoelastic filler. The proposed isolation device has the ability to support a relatively large static load with little deflection …
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Six degree of freedom active vibration isolation using quasi-zero stiffness magnetic levitation.
Vibration is recognised as one of the most significant disturbances to the operation of mechanical systems. Many traditional vibration isolator designs suffer from the trade-off between load capacity and isolation performance. Furthermore, in providing sufficient stiffness in the vertical direction …
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A Hybrid Adaptive and Robust Control Methodology With Application to Active Vibration Isolation
… of new approaches to achieve broad-band active vibration isolation with electrohydraulic actuation. Two new methods, the velocity-tracking approach and the position-tracking approach, are proposed and implemented in a custom-built multiple degree-of-freedom active vibration isolation testbed. …
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