Parametric Transfer Path Analysis for Vibration Characterization
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Solution Overview
Problem
Current methods for Transfer Path Analysis (TPA) are time-consuming and prone to inaccuracies due to the need for extensive measurement efforts and the reliance on mount stiffness data, which is often unavailable, and suffer from ill-conditioning problems, especially in Operational Path Analysis (OPA).
Innovation Solution
A method and system that utilize parametric models to characterize vibrational and acoustic transfer paths by receiving in-situ input and response data, measuring system response functions, and applying these models to estimate loads, allowing for efficient and accurate characterization without requiring extensive mount stiffness data and minimizing ill-conditioning issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional TPA methods using coherence analysis or inverse force identification are used, then measurement accuracy can be improved, but measurement time and complexity increase significantly
Solution Approach 1:
The patent changes the mathematical parameters from full inverse force identification to a reduced set of transfer path analysis parameters. By focusing on identifying only the relevant transfer paths and their characteristics rather than complete force identification, the measurement process becomes faster while maintaining sufficient accuracy for practical applications.
Solution Approach 2:
The patent extracts and isolates only the essential transfer path information needed for practical analysis, separating it from the complete force identification process. This extraction approach removes unnecessary measurement steps while retaining the critical data needed for accurate transfer path characterization.
2Measurement precision
If mount stiffness data are used in Operational Path Analysis, then load identification accuracy improves, but the method becomes inapplicable when stiffness data are unavailable and ill-conditioning problems occur
Solution Approach 1:
The patent introduces transfer path functions as intermediary parameters that bridge the relationship between measured responses and source forces without requiring direct knowledge of mount stiffness. These intermediary functions allow load identification to proceed through alternative measurement paths that do not depend on unavailable stiffness data.
Solution Approach 2:
The patent changes the dependency from mount stiffness parameters to transfer path function parameters. By reformulating the analysis in terms of transfer path functions that can be directly measured or estimated from system responses, the method becomes applicable regardless of whether mount stiffness data are available.
3Measurement precision
If extensive measurement efforts are conducted to obtain complete system characterization, then analysis accuracy improves, but the complexity and resource requirements increase
Solution Approach 1:
The patent segments the complete system characterization into distinct transfer path components. Instead of measuring and analyzing the entire system as a single complex entity, the method divides the analysis into separate transfer paths that can be identified and characterized independently, reducing overall measurement complexity.
Solution Approach 2:
The patent applies partial action by measuring only the specific transfer paths and responses that are relevant to the analysis objective, rather than conducting exhaustive measurements of all possible system characteristics. This selective measurement approach achieves sufficient accuracy for practical purposes while reducing complexity.
Data Source
AI summary
A method (200) for the characterization of vibrational and/or acoustic transfer path related data of a physical system (100) where vibration or acoustics may play a role. The method (200) has a step of receiving (210) input data for at least one input point of the physical system and/or response data for at least one response point of the physical system (100). The method (200) further has a step of receiving (220) at least one system response function between the at least one input point and the at least one response point indicative of the transfer of vibration and/or acoustic signals. The method (200) also has a step of applying (230) at least one parametric model characterising at least one load on the physical system as a function of the input data, where the parametric models are identified from the input data and/or response data and the physical system response functions.