VIBES RESEARCH

We work on the forefront of innovation with test-based techniques. At the Delft University of Technology VIBES facilitates the master degree course in Experimental Dynamics. Through in-house and joint research projects, we continuously expand our knowledge in the field of test-based techniques. This page shows all the relevant published works of VIBES and VIBES’ employees. If you are interested in a joint research project, please get in touch.

DYNAMIC SUBSTRUCTURING
EXPERIMENTAL MODELLING

General Framework for Dynamic Substructuring: History, Review, and Classification of Techniques

In this paper a vision on substructuring methods is proposed, by recalling important historical milestones that allow us to understand substructuring as a domain decomposition concept. Based on the dual and primal assembly of substructures, a general framework for the classification of the methods is presented. This framework allows us to indicate how the various classes of methods, can be derived from a clear mathematical description of substructured problems.

 Dennis de Klerk
 D. J. Rixen
 Sven N. Voormeeren

conference paper May 2008
READ FULL TEXT

DYNAMIC SUBSTRUCTURING
EXPERIMENTAL MODELLING

An improved methodology for the virtual point transformation of measured frequency response functions in dynamic substructuring

Crucial in Dynamic Substructuring is the correct definition of the interfaces of the subsystems and the connectivity between them. Although this is straightforward practice for numerical finite element models, the experimental equivalent remains challenging. One of the issues is the coupling of the rotations at the interface points that cannot be measured directly. This work presents a further extension of the virtual point transformation that is based on the Equivalent Multi-Point Connection (EMPC) method and Interface Deformation Mode (IDM) filtering.

 Maarten Van der Seijs
 Daniël van den Bosch
 D. J. Rixen
 Dennis de Klerk

conference paper June 2013
READ FULL TEXT

DYNAMIC SUBSTRUCTURING
EXPERIMENTAL MODELLING

Validation of Current State Frequency Based Substructuring Technology for the Characterisation of Steering Gear–Vehicle Interaction

This paper presents a validation study of several experimental Frequency Based Substructuring (FBS) techniques that were developed recently. Advances in the techniques up to 2009 were already applied and validated using the rear axle differential – vehicle interaction as a test case. Recent advances have only been tested on relatively simple academic problems. This validation study is conducted at BMW and focuses on the complex interaction between the steering gear and the vehicle.

 Maarten Van der Seijs
 Dennis de Klerk
 Daniel Rixen
 Siamand Rahimi

conference paper January 2014
READ FULL TEXT

DYNAMIC SUBSTRUCTURING
EXPERIMENTAL MODELLING

Wikipedia page on Dynamic Substructuring

This page provides an accessible overview of Dynamic Structuring, the interface conditions required and the applications of Dynamic Substructuring in different domains.

READ FULL TEXT

TRANSFER PATH ANALYSIS

General framework for transfer path analysis: History, theory and classification of techniques

Transfer Path Analysis (TPA) designates the family of test-based methodologies to study the transmission of mechanical vibrations. Since the first adaptation of electric network analogies in the field of mechanical engineering a century ago, a multitude of TPA methods have emerged and found their way into industrial development processes. Nowadays the TPA paradigm is largely commercialised into out-of-the-box testing products, making them more difficult to understand. The aim of this paper is to derive and review a wide repertoire of TPA techniques from their conceptual basics.

 Maarten Van der Seijs
 Daniel J. Rixen
 Dennis de Klerk

conference paper August 2015
READ FULL TEXT

TRANSFER PATH ANALYSIS

A Comparison of Two Component TPA Approaches for Steering Gear Noise Prediction

This paper presents a comparison of two component Transfer Path Analysis methods to predict the transmission of steering gear vibrations into the vehicle. The blocked-force TPA concept is used, allowing to measure the electric steering system on a test bench, separately from the car. Following up on an earlier study, a new test bench has been designed that is more compliant and therefore better suited for matrix-inverse force determination. Equivalent blocked forces are determined on this test bench using the in-situ method. A comparison is made with the blocked forces that were measured directly on the former stiff test bench.

 Maarten Van der Seijs
 Eric Pasma
 Dennis de Klerk
 Daniel J. Rixen

conference paper February 2015
READ FULL TEXT

TRANSFER PATH ANALYSIS

An indicator sensor criterion for in-situ characterisation of source vibrations

Component-based Transfer Path Analysis allows us to analyse and predict vibration propagation between an active source and passive receiver structures. The forces that characterise the active source are determined using sensors placed on the connected passive substructure. The success of the characterisation is not only dependent on the hammer skill of the experimentalist, but also relates to sensor placement, overdetermination and matrix conditioning. In this paper the effects of each of these influences are studied using theoretical approaches, numerical studies and measurements on a benchmark structure designed for in-situ source characterisation.

 Mathieu Wernsen
 Maarten Van der Seijs
 Dennis de Klerk

conference paper January 2017
READ FULL TEXT

TRANSFER PATH ANALYSIS

A robust Transfer Path Analysis method for steering gear vibrations on a test bench

This paper presents a Transfer Path Analysis (TPA) method to predict the transmission of steering gear vibrations of BMW vehicles in a multi-kHz range. The blocked-force TPA concept is used, allowing the active steering system to be measured separately from the vehicle. Compared to classical TPA methods, the blocked-force approach offers possibilities for component-wise optimisation and rapid evaluation of design changes. The presented methods are validated by means of a comparison with the acoustic levels that were measured directly in the car under the same operational conditions

 Maarten Van der Seijs
 Eric Pasma
 Dennis de Klerk
 Daniel J. Rixen

conference paper January 2017
READ FULL TEXT

TRANSFER PATH ANALYSIS

A benchmark structure for validation of Experimental Substructuring, Transfer Path Analysis and Source Characterisation techniques

This paper presents a practical study on popular Experimental Dynamic Substructuring topics. A series of substructures is designed of such complexity to fit in right between “real life” structures and “academic” structures. The designed benchmark structure comprises an active side with a vibration source, a passive side and a test rig for source characterisation. The connectivity is scalable in complexity and substructuring-compatible component models are obtained from impact measurements using the Virtual Point Transformation.

 Maarten Van der Seijs
 Eric Pasma
 Daniël van den Bosch
 Mathieu Wernsen

conference paper January 2017
READ FULL TEXT