A Braking System for Tests with a Prescribed Deceleration Pulse |
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Authors: | V Giavotto M Anghileri L-M L Castelletti A Milanese D M Manganini |
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Institution: | (1) Dipartimento di Ingegneria Aerospaziale, Politecnico di Milano, Via La Masa 34, 20156 Milan, Italy;; |
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Abstract: | Tests with a prescribed deceleration pulse are fundamental to the development and certification of crashworthy structures.
At the Politecnico di Milano Laboratory for the Safety of Transports these tests are carried out using a horizontal impact-sled
facility. Test articles are mounted on a trolley which is launched down a rail and then arrested by means of a braking system
that allows prescribed deceleration pulses to be obtained. The oleo-pneumatic braking system customarily used in these tests
is difficult to use and user-defined time-histories of the deceleration pulse cannot be obtained. In an effort to overcome
these limits, a new braking system was developed. The idea was to arrest the trolley by means of a number of beams that varied
in length and that were positioned at variable distances from each other. Experimental tests and numerical simulations were
carried out in parallel to verify the feasibility of the new system and improve on the initial design. A mathematical model
and genetic algorithm were also developed and used as part of a method to find the test set-up that allowed user-defined deceleration
pulses to be obtained. A full-scale test with the deceleration pulse prescribed for small airplane seat certification was
carried out to assess the performance of the braking system. The test revealed a weakness of the braking system that was then
further developed before being put into full operational service. |
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