Mr. Leopoldo R. O. Pisanelli Profile

Leopoldo R. O. Pisanelli

at Univ. of São Paulo

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Proceedings Article | 11 June 2021 Open Access

Application of TPA techniques to identify operational forces in optical payloads interfaces

Alexandre C. R. Ramos, Leopoldo R. O. Pisanelli

Proceedings Volume 11852, 118524O (2021) https://doi.org/10.1117/12.2599802

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The transfer paths analysis (TPA) is a useful tool to solve noise and vibration problems, since it helps in the study of sources and propagation paths, allowing proposing efficient modifications to minimize vibration in the regions of interest even at early stages in the process of build physical payloads prototypes. In classical TPA, the operational forces are characteristic of the complete system, active subsystem more passive subsystem, this implies that, with each modification in one of the subsystems, it is necessary to redo all tests for the correct determination of noise or vibration at the points of interest of the object under test, constituting one of the obstacles to the widespread use of classical TPA in the product development process. For this reason, in recent years, interest in the development of faster and simpler techniques for analyzing energy transfer paths has been renewed, aiming to bypass the operational limitations of classical TPA. In this scenario, the set of methods called component-based TPA stands out, which is a set of methods that characterizes the excitation of vibration or a noise source through a set of equivalent forces or speeds inherent only to the active subsystem. In this way, the responses, at points of interest located in the passive subsystem, can be calculated using these forces and the FRF of the complete system. The main methods of this class of TPA are the blocked force, freevelocity, hybrid interface and in situ. This work presents a review of component-based TPA methods and proposes the use of these methods in the process of determining equivalent forces in spatial payloads of the active subsystem that, combined with the dynamics of the passive subsystem, allows to predict vibration at points of interest located in the passive subsystem, without having to analyze the complete system.

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