The Shock and Vibration Bulletin PDF Download
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Author:
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ISBN:
Category : Shock (Mechanics)
Languages : en
Pages : 246
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Book Description
Author:
Publisher:
ISBN:
Category : Shock (Mechanics)
Languages : en
Pages : 246
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Book Description
Author:
Publisher:
ISBN:
Category : Shock (Mechanics)
Languages : en
Pages : 708
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Book Description
Author:
Publisher:
ISBN:
Category : Shock
Languages : en
Pages : 0
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Book Description
Many items of equipment in a variety of vehicles are subjected to both shock and short (nonstationary) bursts of random excitation. It is common practice to analyze these latter events as though they were stationary and measure their severity in terms of spectral density of acceleration. The errors involved and difficulties of doing this are reviewed. Actually, short bursts of random vibration are similar to random shocks, particularly when the failure, if any, is due to the single highest peak (SHP) of the response, rather than to fatigue. The importance of the SHP as a measure of damage is also discussed. When it is the correct damage criterion, we should attempt to control it and not spectral density. Since the SHP is a random variable, we cannot control it using random excitation, but we can with shock tests. For systems with a single degree of freedom, or those whose sensitivity to damage is known to be confined to a narrow frequency band, the solution is simple, once the statistical distribution of the SHP is known. Available experimental and theoretical data are reviewed. Using the prescribed percentile of the SHP distribution, the shock test as severe as the random excitation is derived. In certain cases, when both stationary random and shock tests are prescribed, the former can be eliminated by deriving a shock test whose highest response peaks at each frequency envelop those of both original tests. The Situation with multidegree of freedom systems is shown to be significantly more difficult and not amenable to one method of solution. A technique is introduced for extending the results to these situations. Preliminary results obtained on a analog computer for the two degree of freedom system are presented to illustrate certain trends.
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Languages : en
Pages : 0
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Book Description
The report presents a series of reports on the general subjects of shock and vibration. Stress and vibration effects on such structures as airframes, railroad cars and ships are discussed.
Author:
Publisher:
ISBN:
Category : Shock (Mechanics)
Languages : en
Pages : 908
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Book Description
Author: Shock and Vibration Information Center
Publisher:
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Category :
Languages : en
Pages : 0
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Book Description
Author:
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ISBN:
Category : Shock (Mechanics)
Languages : en
Pages : 656
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Book Description
Author: Christian Lalanne
Publisher: John Wiley & Sons
ISBN: 1118618998
Category : Technology & Engineering
Languages : en
Pages : 479
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Book Description
Mechanical Vibration and Shock Analysis, Second Edition Volume 3: Random Vibration The vast majority of vibrations encountered in a real-world environment are random in nature. Such vibrations are intrinsically complicated, but this volume describes a process enabling the simplification of the analysis required, and the analysis of the signal in the frequency domain. Power spectrum density is also defined, with the requisite precautions to be taken in its calculation described together with the processes (windowing, overlapping) necessary for improved results. A further complementary method, the analysis of statistical properties of the time signal, is described. This enables the distribution law of the maxima of a random Gaussian signal to be determined and simplifies calculation of fatigue damage to be made by the avoidance of the direct counting of peaks. The Mechanical Vibration and Shock Analysis five-volume series has been written with both the professional engineer and the academic in mind. Christian Lalanne explores every aspect of vibration and shock, two fundamental and extremely significant areas of mechanical engineering, from both a theoretical and practical point of view. The five volumes cover all the necessary issues in this area of mechanical engineering. The theoretical analyses are placed in the context of both the real world and the laboratory, which is essential for the development of specifications.
Author:
Publisher:
ISBN:
Category : Shock (Mechanics)
Languages : en
Pages : 274
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Book Description
Author: Christian Lalanne
Publisher: John Wiley & Sons
ISBN: 1118931149
Category : Science
Languages : en
Pages : 464
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Book Description
This volume considers the shock response spectrum, its various definitions, properties and the assumptions involved in its calculation. In developing the practical application of these concepts, the forms of shock most often used with test facilities are presented together with their characteristics and indications of how to establish test configurations comparable with those in the real, measured environment. This is followed by a demonstration of how to meet these specifications using standard laboratory equipment – shock machines, electrodynamic exciters driven by a time signal or a response spectrum – with a discussion on the limitations, advantages and disadvantages of each method.
