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Transactions: WSEAS TRANSACTIONS ON APPLIED AND THEORETICAL MECHANICS
Transactions ID Number: 52-245
Full Name: Natalie Baddour
Position: Associate Professor
Age: ON
Sex: Female
Address: Department of Mechanical Engineering, University of Ottawa
Country: CANADA
Tel: +1(613)562-5800 X2324
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E-mail address: nbaddour@uottawa.ca
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Title of the Paper: Mathematical and Mechanical Analysis of the Design of Impact Absorbers
Authors as they appear in the Paper: Natalie Baddour
Email addresses of all the authors: nbaddour@uottawa.ca
Number of paper pages: 10
Abstract: This paper considers an analytical statement of the problem of designing a linear impact absorber in one dimension. The absorber design problem can be stated as choosing the absorber stiffness and damping properties so that a given mass with a certain initial velocity can be brought to rest within a maximum allowable distance while not allowing the maximum magnitude of linear acceleration to exceed a given quantity. A framework is presented to select the design parameters for the simple spring-damper impact absorber. The selection is based on a mathematical approach that starts with determining if the requested design criteria are even achievable. It is shown based on the application of Newton's second law that there is a lower limit on the achievable design problem, namely if the object can be brought to rest within a maximum displacement without exceeding a maximum acceleration. This lower limit is not material dependent and is based on the laws of mechanics!
. It is further shown that with the selection of a linear-spring damper combination that it is possible to come close to this theoretical lower limit only with an underdamped absorber. With the choice of an overdamped absorber, the theoretical lower limit is higher. Designing for deflection or acceleration considerations is also discussed. The scope of the material presented is general, however it is hoped that these results may be applicable to helmet design.
Keywords: Impact, Analysis, Design, Linear
EXTENSION of the file: .pdf
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How Did you learn about congress: Francine Bisson, fbisson@uottawa.ca, University of Ottawa, K1N 6N5, Ottawa, Canada
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