Abstract
This article is based on research results at the IPEK - Institute of Product Engineering. A method is presented using maneuver-based testing in a corresponding development environment. The use-case is the investigation of NVH-Phenomena in a conventional drive drain. The objective is a continuous use of the IPEK X-in-the-loop approach.
Therefore a high amount of data (maneuvers, evaluation criteria, information about test-setups, etc.) within the vehicle development process must be centrally managed. To handle this large number of vehicle test criteria and conditions an appropriated tool is needed. The first step is the development of a XiL-related tool that serves as a XiL-technique and supports the maneuver based development of vehicles.
This method is verified by the investigation of NVH phenomena in the vehicle powertrain. Vehicles equipped with combustion engine and a standard drive train composed of front-mounted engine and rear-wheel drive show derogations of comfort including vibrating seats and humming within definite engine speed range. Especially for exclusive high-performance vehicles this issue is customer sensitive. Using the XiL-validation framework it is shown that the described NVH-phenomenon is caused by torsional oscillation of the powertrain. Furthermore several countermeasures e.g. a dynamic vibration absorber, acoustic isolation, reduction of torsional oscillation by expanding the clutch slip and shift of the own frequency are defined. Finally these countermeasures are analysed in order to illustrate their suitability and efficiency. The interactions of the tested subsystems have strong influence on comfort issues as well as on longitudinal dynamics.
The presented method offers a development environment for vehicles that integrates appropriate XiL-techniques. Focus is the implementation of a XiL-related maneuver tool and specific tests for the identification of NVH phenomena such as humming noise. Furthermore several corrective actions are defined and analysed. Taking everything into account this approach provides an efficient maneuver based development tool for the effective investigation of vehicles.
KEYWORDS – Maneuver-based-testing, NVH, humming-noise, X-in-the-Loop, Validation