Unlocking insights | Discovering new methods

We work on the forefront of innovation with test-based techniques. VIBES facilitates the master degree course in Experimental Dynamics at the Delft University of Technology. 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.

Blocked ForcesTransfer Path AnalysisVirtual Point

Many OEMs use dedicated test bench setups for testing and developing of components separately from their vehicle platforms. Relating these results to full-vehicle assemblies is not immediately possible, because of the difference in boundary conditions and incompatibility between test bench and vehicle measurement points. This study focuses on the use of tire noise test benches in the engineering of full-vehicle NVH. We show how virtual points, easily obtained using DIRAC, ensure compatibility between various test assemblies.

15 September 2021

Blocked ForcesTransfer Path Analysis

The goal of this paper is to provide a method for airborne source description of the EC and to determine the airborne sound contribution at the driver’s ear. The radiation of the EC was approximated by six acoustic monopoles emitting a volume acceleration. The characterization was conducted with the help of noise transfer functions (NTFs) and operational measurements in an anechoic chamber. Volume acceleration sources were used to measure the NTFs. The validation of the source identification was performed in a changed environment and a vehicle.

01 September 2020

Blocked ForcesVirtual Point

Before performing a transfer path analysis (TPA), the engineer needs to think about the right modeling of the source’s interface with the receiver. In practice, the vibration transfer from the source to the receiver is often modeled with three translational forces in each connection point. Mechanically this corresponds to a ball joint connection, which cannot transfer any moments. This study compares different complexities of interface descriptions on the industrial example of an electro-magnetic roll control (ERC) in a passenger car.

01 September 2020

Blocked ForcesDynamic SubstructuringTransfer Path Analysis

This thesis is the result of a 4-year collaboration between the Technical University of Munich and the BMW Group. The goal was to apply substructuring methods to the Noise Vibration Harshness (NVH) engineering needed for integrating electric climate compressors in upcoming vehicles. Specifically, the aim was to simulate the compressor noise in the cabin for different, virtual design variants of the isolation concept. Therefore, the methods from two broader fields were applied: First, the excitation of the compressor was modeled with component transfer path analysis (TPA) methods. Second, the full transfer path from the compressor to the driver’s ear is assembled from multiple subcomponent models, via dynamic substructuring (DS).

01 June 2020

Dynamic SubstructuringVirtual Point

Hydraulic testing machines can be used to obtain frequency dependent dynamic stiffnesses of rubber isolators in translational degrees of freedom (DoF). Alternatively, dynamic substructuring based methods can be used. Results of two substructuring methods will be compared to those from a hydraulic machine.

01 March 2020

Blocked ForcesTransfer Path AnalysisVirtual Point

Due to the lack of masking noise from combustion engines in electric vehicles, the noise of auxiliary components is becoming a relevant topic. One of these components is the electric refrigerant compressor (ERC). This paper addresses the airborne sound transmission of the compressor, using the methods of component-based transfer path analysis (TPA).

01 November 2019

Blocked ForcesTransfer Path AnalysisVirtual Point

Currently two ISO standards are proposed for source characterisation. In this paper it is shown how the different approaches can be derived and compared using the general framework for Transfer Path Analysis (TPA).

01 June 2019

Blocked ForcesTransfer Path AnalysisVirtual Point

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.

01 January 2017

Blocked ForcesTransfer Path AnalysisVirtual Point

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.

01 January 2017

Blocked ForcesTransfer Path AnalysisVirtual Point

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.

01 January 2017

Blocked ForcesDynamic SubstructuringTransfer Path AnalysisVirtual Point

Sound and vibration have a defining influence on our perception of product quality. They are especially well-known aspects in the automotive industry. While traditional combustion engines are gradually getting replaced by hybrid or full-electric drive-lines, other electromechanical (so-called mechatronic) systems make their entrance. As a consequence, the sound experience shifts from low-frequent engine roar to high-frequent humming and whining – a yet unfamiliar experience that calls for redefinition of the soundscape. This thesis presents techniques that aim to implement measurements of structural dynamics and active vibration sources into development processes. This simulation is facilitated by use of Experimental Dynamic Substructuring: a methodology that determines structural dynamic aspects of complete products based on individually measured components.

16 June 2016

Blocked ForcesDynamic SubstructuringTransfer Path AnalysisVirtual Point

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.

01 August 2015

Blocked ForcesDynamic SubstructuringTransfer Path AnalysisVirtual Point

This paper presents a comparison of two component Transfer Path Analysis methods to predict the transmission of steering gear vibrations into the vehicle.

01 February 2015

Dynamic Substructuring

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

01 August 2014

Dynamic SubstructuringVirtual Point

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.

01 January 2014

Dynamic SubstructuringVirtual Point

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.

01 June 2013

Blocked ForcesDynamic Substructuring

This thesis deals with new methods, which can determine the dynamic response of a complex system identified in operation, based on the knowledge of its subsystem dynamics and excitation.

18 March 2009

Dynamic Substructuring

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.

01 May 2008

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