A new TPA (Transfer Path Analysis) approach was developed combining the speed of the operational path method (OPA) and the effectiveness of the conventional TPA methods. The key is to use parametric load models to characterize the operational forces and acoustic loads estimated based on measured path inputs such as mount accelerations and pressures. The parametric load models are estimated from (i) in situ measured operational path inputs and target response signal(s) and from (ii) transfer path FRF's using mathematical techniques. Extra acceleration and/or pressure indicators can be included in the set of equations to obtain more robust parameter estimations. The proposed TPA method has several advantages: 1. The method is fast and accurate. 2. It allows balancing between speed of execution and path accuracy. The more extra indicators used, the more robust the estimations and the better the path accuracy, but the higher the FRF measurement efforts and time. 3. The measurement efforts are small in comparison to the existing inverse load identification technique. Next to the operational measurements of path inputs and target(s), the new method requires in many cases only one reciprocal FRF measurement per target point. Adding extra indicators for improving robustness requires extra FRF measurements, but this is still a small effort compared to the huge measurement efforts to build the full FRF matrix for inverse load identification. 4. The method does not require mount stiffness data, which are seldom available and not always accurate. 5. The estimation of the parametric load models is numerically stable. Ill-conditioning problems like those in Operational Path Analysis (OPA) hardly ever occur. 6. The estimated model parameters may allow determining additional interesting information of the system. For example, the ability of estimating the mount stiffness characteristics from TPA measurement data is an interesting additional feature of the method.
Balancing speed and accuracy of test based NVH troubleshooting using an advanced path contribution method
Abgleichgeschwindigkeit und Genauigkeit der testbasierten Fehlersuche nach Störgeräuschen im Kraftfahrzeug mit Hilfe einer fortgeschrittenen Path-Contribution-Methode
2008
12 Seiten, 4 Bilder, 17 Quellen
Aufsatz (Konferenz)
Englisch
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