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Tuesday, July 14, 2020 | History

2 edition of Study of active vibration isolation systems for severe ground transportation environments found in the catalog.

Study of active vibration isolation systems for severe ground transportation environments

Peter C. Calcaterra

Study of active vibration isolation systems for severe ground transportation environments

by Peter C. Calcaterra

  • 251 Want to read
  • 10 Currently reading

Published by National Aeronautics and Space Administration; for sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Va. in [Washington] .
Written in English

    Subjects:
  • Ground-effect machines -- Vibration.,
  • Vibration (Aeronautics) -- Damping.

  • Edition Notes

    Statementby Peter C. Calcaterra, Richard D. Cavanaugh, and Dale W. Schubert.
    SeriesNASA contractor report, NASA CR-1454, NASA contractor report ;, NASA CR-1454.
    ContributionsCavanaugh, Richard D., joint author., Schubert, Dale W., joint author., Barry Wright Corporation., Langley Research Center.
    Classifications
    LC ClassificationsTL521.3.C6 A3 no. 1454
    The Physical Object
    Paginationvi, 155 p.
    Number of Pages155
    ID Numbers
    Open LibraryOL4854629M
    LC Control Number75605020

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    In today`s world of nanotechnology, optimal vibration isolation is absolutely essential for creating and analysing very small structures. Active vibration isolation is the most effective solution to isolate high-resolution measurement equipment from disturbing vibrations. Element and system design for active and passive vibration isolation it is difficult to construct passive isolation systems compliant enough to achieve specifications on low-frequency ground transmission without introducing hysteresis as well as high-frequency transmission resonances. We develop and test a compliant support that employs a Cited by:

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Study of active vibration isolation systems for severe ground transportation environments by Peter C. Calcaterra Download PDF EPUB FB2

Study of active vibration isolation systems for severe ground transportation environments. [Washington] National Aeronautics and Space Administration; for sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Va.

Improvement of a vibration isolation table's characteristics is attained by the use of a control system. In addition to the natural cushioning propert Cited by: 2. Study on Vibration Isolation Systems for Sensitive Equipment.

In major earthquakes there are some buildings which should stand functionally after main shock, like hospitals, relief and fire centers and so on, where sensitive devices should work properly after vibrations even if the structure faces severe damage.

Six degree of freedom active vibration isolation. system is required for these kinds of vibration. this system, control algorithms are very. important factors of performance improvement. The system of this sort has coupling and system.

uncertainties due to changing of environment. An active force actuated vibration isolation system uses a velocity sensor in the form of a velocity-sensitive geophone to sense payload velocity and modifies the geophone signal to control the force applied to oppose the vibration.

The modified signal effectively reduces the inherent resonant frequency of the geophone and avoids by: The aim of this thesis about active isolation vibration system for the bed of ultra-precision turning machine is to introduce the active vibration isolation to the ultra-precision isolation system.

This report, Optimal Switching in Active Vibration Isolation Systems (AVIS), covers the internship study of the author, who is studying within the System and Control master program at the Eindhoven Technical University, under the supervision of Prof.

Henk Nijmeijer. x_rel is the motion of the mass/equipment relative to the perturbing motion of the base. The Impact of Damping on Vibration Isolation.

The impact of isolator damping of performance of a vibration isolation system is illustrated using the isolation scheme shown in Figure Size: KB.

However, some studies have been done for the vibration isolation of the components in IMU; hence protecting the whole system [8,11]. The second class of solutions can be used in the isolation of an IMU which is about mitigating vibrations along the path from the source to the receiver system.

39 Isolation of buildings from ground vibration: a review of recent progress D E Newland, MA, ScD, FEng, FIMechE, FIEE and H E M Hunt, PhD, CEng, MIMechE Department of Engineering, University of Cambridge Many buildings near railways are mounted on rubber springs to isolate them from ground vibration.

The solutions to most isolator problems begin with consideration of the mounted system as a damped, single degree of freedom system.

This allows simple calculations of most of the parameters necessary to decide if a standard isolator will perform satisfactorily or if a custom design is Size: KB. The principles involved in both vibration and shock isolation are similar.

However, differences exist due to the steady state nature of vibration and the transient nature of shock. This paper discusses the basic properties of vibration and shock isolators, the requirements for designing successful isolation systems and offers practicalFile Size: KB.

An active force actuated vibration isolation system uses a velocity sensor in the form of a velocity-sensitive geophone to sense payload velocity and modifies the geophone signal to control the force applied to oppose the vibration.

will be able to analyze an isolation system and optimize design variables considering various types of optimization problem scenarios. Keywords: Passive vibration isolation analysis, multi-degree-of-freedom system, elastomeric isolators, location and parameter optimization, hybrid optimization, Monte Carlo Size: 3MB.

LOW FREQUENCY VIBRATION ISOLATION AND ALIGNMENT SYSTEM FOR ADVANCED LIGO a dissertation submitted to the department of electrical engineering and the committee on. For a vibration isolation system, it may represent the total transfer function for a sensor which monitors the plant’s output (an accelerometer), some electronic filters, amplifiers, and, lastly, an.

With the rapid development of subway systems, the negative environmental impacts of vibration induced by subways has gradually become a research hotspot.

For the purpose of developing predictive models of vibration and designing effective vibration mitigation systems, continuous field dynamic measurements were conducted simultaneously in a subway tunnel, ground, and building in eastern Cited by: 2.

An active strut technique for micro-vibration isolation has been developed for a long time. In order to suppress micro-vibration of multi-degree-of-freedom systems, active isolation platforms have also been designed.

Download: Download full-size image; Fig. Typical diagram of active vibration isolation systems: System stiffness Cited by: Combined with the coordinate transformation, the dynamic governing equations for elastic foundation under a moving load are established by using the reverberation ray matrix method, and the isolation effect of a graded wave impeding block is studied.

The displacement and the stress are obtained in the time domain by using numerical inverse Fourier : Qiang Ma, Feng-xi Zhou. In this dissertation, an analytical investigation on active, semi-active and passive vibration control mechanisms is presented in order to achieve improved shock and vibration isolation of mechanical systems, especially ground vehicle applications.

A hybrid active vibration isolation system, incorporating an electro-magnetic force generator along with passive damping and spring elements, is Cited by:. SoftRide Vibration Isolation Systems Typical vibration isolation systems work by connecting the isolated structure (payload) to the base structure (launch vehicle) by means of a resilient mount or mounts.

The resilient mounts have low relative stiffness as compared to the base and payload, and some degree of structural Size: 2MB.In some applications, active isolation systems like the Table Stable systems available from Herzan can deliver the required performance, while passive isolation systems are adequate for applications which are not so sensitive.

Low Frequency Resonance. Low frequency resonance problems are common in all passive vibration isolation : Herzan LLC.ambient vibration and the dimensions of investigated or manufactured structures fall in the same range.

Despite of all the constructional differences, the essence of vibration isolation systems is identical. The passive vibration isolation system consists of a spring and damper (dash-pot). The spring is File Size: KB.