Bert Pluymers

Bert Pluymers
KU Leuven | ku leuven · Department of Mechanical Engineering

About

179
Publications
30,966
Reads
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1,657
Citations
Additional affiliations
October 2008 - present
KU Leuven
Position
  • Industrial Research Manager
June 2006 - September 2008
KU Leuven
Position
  • PostDoc Position
August 2000 - May 2006
KU Leuven
Position
  • PhD Student

Publications

Publications (179)
Article
Full-text available
A novel resonant metamaterial solution is designed and applied to a vehicle in order to reduce the structure-borne noise in the interior compartment due to the first acoustic tyre resonances around 230 Hz. This noise control solution consists of metal 3D printed resonant elements applied to the rear wheel arches of a vehicle and is designed as a po...
Preprint
Full-text available
A novel resonant metamaterial solution is designed and applied to a vehicle in order to reduce the structure-borne noise in the interior compartment due to the first acoustic tyre resonances around 230Hz. This noise control solution consists of metal 3D printed resonant elements applied to the rear wheel arches of a vehicle and is designed as a pot...
Article
The cylindrical cup geometry, an archetype model, used to analyze the dimensional stability of the deep drawing process, is employed to study the vibro-acoustic performance subsequent to the forming simulations. Cylindrical cups are manufactured with a depth of 24 mm, thicknesses (0.97 mm & 1.21 mm) and using two different blank holder force (BHF)...
Article
Full-text available
This paper presents the state-of-the-art technologies and development trends of wind turbine drivetrains – the system that converts kinetic energy of the wind to electrical energy – in different stages of their life cycle: design, manufacturing, installation, operation, lifetime extension, decommissioning and recycling. Offshore development and dig...
Conference Paper
Full-text available
To comply with stringent environmental and noise standards in the automotive sector, a resonant metamaterial solution is applied to a vehicle to reduce the interior structure- borne noise due to the acoustic tyre resonances around 220 Hz. This novel solution consists of metal 3D printed resonant elements applied on the rear wheel arches of a vehicl...
Conference Paper
Experimental modal analysis (EMA) is a measurement technique to assess the dynamical properties of mechanical components and systems in various phases of their life cycle, e.g. for design, end-of-line testing and health monitoring. The most common EMA uses accelerometers, which provide high frequency acceleration measurements at a few discrete loca...
Preprint
Full-text available
This paper presents the state-of-the-art technologies and development trends of wind turbine drivetrains – the energy conversion systems transferring the kinetic energy of the wind to electrical energy – in different stages of their life cycle: design, manufacturing, installation, operation, lifetime extension, decommissioning, and recycling. Offsh...
Article
Full-text available
The steady-state vibro-acoustic behavior of a plate-cavity system under harmonic excitations and static temperature loads is investigated using a Wave Based Method (WBM). The solutions of the governing equations of the vibro-acoustic problem considering thermal effects are derived. The coupled wave based model is constructed based on wave functions...
Chapter
Due to environmental and economic requirements, lightweight design is increasingly used in automotive applications. However, the use of lightweight design typically comes at the cost of impaired NVH performance. Classic solutions to improve the NVH performance usually rely on adding mass or volume, conflicting with lightweight design. In the search...
Article
Full-text available
Multi-material topology optimization has become a popular design optimization discipline since it allows to go a step further in topology optimization of the design of lightweight components and structures. However, it also presents additional challenges in terms of managing a higher complexity in the optimization problem, reliably estimating the m...
Conference Paper
Cup-shaped components, besides being basic forming objects, are also important for investigating the complex real-time behaviour of sheet metal components. Initial experimental investigations of cylindrical cups of same geometrical dimensions but produced with different blank holding forces (BHF) revealed significantly altered dynamic behaviour. Th...
Article
This paper presents a framework for condition monitoring of large non-linear electro-mechanical systems. Faults are assessed in different subsystems by means of model-based virtual sensors obtained through joint state-input estimation algorithms. Two outputs of the estimation are used as indicators of the condition of the system: (i) the estimated...
Article
Full-text available
The Digital Twin (DT) is a promising concept which aims at creating a virtual replica of an individual system, that can provide information otherwise not available. This paper presents a DT of a vertical transportation system, focusing on how to model this DT, and using it to evaluate the system condition and potential corrective solutions. Exploit...
Article
This study used the wave based method (WBM) to investigate the optimum layout of an absorbing material on a vibrating surface. The structural dynamic behavior was examined using the finite element model, and the acoustic response was computed using the WBM. The thickness of the absorbing material on each structural element was considered as the des...
Conference Paper
Full-text available
A numerical and experimental investigation on the effects of axial and circumferential periodically distributed stiffeners on shells is conducted in this work. The Inhomogeneous Wave Correlation (IWC) method is used to characterize the dynamic behavior and the wave propagation in the structures. The dispersion curves are calculated in two orthogona...
Article
Full-text available
The efficient Wave-Based Method (WBM) is extended to predict the bending vibration response of thin-walled rectangular plates under thermal load. Governing equations of dynamic plate bending problems considering thermal effects are first introduced. The general solution and particular solution of governing equation are derived by the separate varia...
Article
A non-destructive testing strategy is proposed that combines microphone measurements and structural measurements in one array. The aim is to lower the total inspection time by reducing the number of structural sensors. This is possible by making use of the easier and faster installation of microphones as compared to structural sensors. Structural s...
Conference Paper
Over the past decades, automotive companies have sought lightweight and performant noise, vibration and harshness (NVH) solutions to comply with stringent regulations for CO2 emissions and noise pollution. Combining lightweight design with improved NVH solutions is often a challenging task: low mass and high stiffness materials are generally charac...
Conference Paper
Full-text available
The physical characteristics of periodic structures are employed to analyze the vibro-acoustic response of several complex structures in the wavenumber domain. This work is focused on the analysis of elastic periodic structures, designed in order to obtain a wave attenuation in certain frequency bands, generating the so-called band-gaps (mainly rel...
Conference Paper
Stringent regulations for CO2 emissions and noise pollution reduction demand lighter and improved Noise, Vibration Harshness (NVH) solutions in automotive industries. Designing light, compact and, at the same time, improved NVH solutions is often a challenge, as low noise and vibration levels often require heavy and bulky additions, especially to b...
Article
This paper investigates a metamaterial solution for efficient vibration attenuation and acoustic radiation reduction of an aluminum pipe. To this end, using unit cell predictions, locally resonant structures are designed to have a pronounced flexural resonance frequency at the vicinity of a dominant vibration mode of the pipe. A direct approach of...
Article
This paper presents a model-based approach for the condition monitoring of guiding rails in vertical transportation systems. A physics-based model of the system is used to estimate friction forces by means of an augmented Extended Kalman Filter (EKF). This estimation is compared to the friction forces predicted by a more detailed model of the syste...
Article
Room acoustics parameters are typically predicted using some form of geometrical acoustics for large rooms. For smaller rooms, phased geometrical acoustics improves results for lower frequencies. The use of a spherical wave reflection coefficient improves the results further, yet the exact impact on room acoustics parameters is not fully known. Thi...
Article
In acoustical spaces, room acoustic parameters are often predicted using energy-based geometrical acoustics. For smaller rooms, interference among coherent reflections is taken into account by phased geometrical acoustics, which improves results for lower frequencies. The use of a spherical wave reflection coefficient improves the results further,...
Article
Viscoelastic materials are mostly used to passively suppress structural vibrations. The theoretical analysis and design of such system require the knowledge of damping properties which are highly frequency-dependent and proper mathematical models for this dependency. The fractional derivative model is attractive as very few empirical parameters are...
Chapter
This paper presents a framework for the condition monitoring of large non-linear electro-mechanical systems. Faults are assessed in different subsystems by means of joint state-parameter estimations. The different estimations are interconnected by a Digital Twin of the system, which provides background information for the physics neglected in the e...
Conference Paper
The vibration and noise amplitude levels at resonance frequency depends on the amount of damping present in the component. In this work, damping enhancement is achieved through a cold working process like shot peening. The residual stress measurements—using X-ray diffraction technique—and vibro-acoustic property measurements of a sheet metal plate...
Conference Paper
Full-text available
This paper investigates the broadband vibro-acoustic and dynamic behavior of different structures, such as flat and curved panels and cylindrical shells. The aim of this work is to investigate propagation and dispersion features through the analysis of the wavenumber domain. The technique used to investigate the vibro-acoustic behavior is a wave pr...
Conference Paper
Full-text available
In this paper, we focus on multi-layer core topology systems which consists in piling up layers made by different kind of cores and offers innovative solutions to periodic structures design. The main objective of this study is to analyze the phenomena occurring in these multilayer core topologies, and then compare the numerical models with experime...
Article
An Equivalent Substructure Modeling (ESM) approach of laminated composite plates with integrated macro-fiber composite (MFC) transducers is described. The proposed approach generates structure-preserving low-order system models for dynamic applications such as vibration suppression and energy harvesting. The direct piezoelectric effect of MFC trans...
Conference Paper
The oil pan of an automobile is a thin, complex sheet metal component and it is manufactured through deep drawing process. Manufacturing processes like deep drawing and multi-state forming are often used to produce this kind of thin sheet metal components with high draw ratios. Generally, multi-state forming is preferred in order to avoid geometric...
Article
The combination of lightweight design and performant Noise, Vibrations Harshness (NVH) solutions has gained a lot of importance over the past decades. Lightweight design complies with the ever more stringent environmental requirements, however conflicts with NVH performance, as low noise and vibration levels often require heavy and bulky systems, e...
Conference Paper
Full-text available
This paper introduces the setup of the European network ITEAM aimed at the training of early-stage researchers (ESR) in the field of multi-actuated ground vehicles (MAGV). A network concept includes three main domains, where fifteen interconnected individual research projects are allocated: MAGV Integration, Green MAGV, and MAGV Driving Environment...
Article
Full-text available
This paper presents a theoretical study of active control of turbulent boundary layer TBL induced sound transmission through the cavity-backed double panels. The aerodynamic model used is based on the Corcos wall pressure distribution. The structural-acoustic model encompasses a source panel (skin panel), coupled through an acoustic cavity to the r...
Article
In many engineering problems, it is customary to use viscoelastic materials in the passive control of structural vibration and noise radiation. The most commonly used numerical tool to obtain detailed information on the performance of complex structures is the finite element (FE) method. However, structures with viscoelastic materials often require...
Article
The vibration response of a component or system can be predicted using the finite element method after ensuring numerical models represent realistic behaviour of the actual system under study. One of the methods to build high-fidelity finite element models is through a model updating procedure. In this work, a novel model updating method of deep-dr...
Article
This paper introduces the setup of the European network ITEAM aimed at the training of early-stage researchers (ESR) in the field of multi-actuated ground vehicles (MAGV). A network concept includes three main domains, where fifteen interconnected individual research projects are allocated: MAGV Integration, Green MAGV, and MAGV Driving Environment...
Article
Full-text available
Recently, it has been shown that a Time Reversal MUltiple Signal Classification (TR-MUSIC) algorithm can be employed to detect defects in samples, which are both challenging in terms of material and in terms of geometrical complexity. This can be achieved by lowering the detection frequency as compared to most other TR and TR-MUSIC applications. In...
Article
Full-text available
This paper describes a technique to magnify the scattering of a wave at a defect by using the natural behavior of a structure. The fundamental physical principle of the detection strategy as well as the way to exploit this principle for detecting defects are explained. The influence of the parameters defect location, defect size and natural frequen...
Article
Smart structures with integrated macro fiber composite (MFC) piezoelectric transducers have been increasingly investigated in engineering. A simple but elaborate system model of such smart structure not only can predict system dynamics, but also can reduce challenges in application. Therefore, the equivalent force (EF) modeling approach is presente...
Article
Joined structures are of great industrial relevance. The dynamic effects of joints are, however, often practically difficult to accurately account for in numerical models, as they often lead to local changes in stiffness and damping. This paper discusses the comparison between measurements and simulations of joined panels considering four different...
Conference Paper
Full-text available
Structural waveguides involving heterogeneous cross-sections or based on periodic patterns are often subjected to wave conversion phenomena. This paper is concerned with a specific type of conversion observed in sandwich structures called bending-to-shear conversion. It occurs in the " transition " bandwidth, where the flexural wave is partially lo...
Conference Paper
Full-text available
The main aims of this paper are the description of the vibroacoustic response of a structure, in particular a periodic structure, subjected to an aerodynamic excitation, the modelling optimization and numerical models validation. A literature review on the response of simple structures, 1-D and 2-D, beams and panels, is reported. The state of the a...
Article
Full-text available
In this paper free vibrations of rotating cylindrical shells with both ends free are studied. The model used also allows for considering a flexible foundation supporting the shell in the sense of a radial and circumferential distributed stiffness. Furthermore, a circumferential tension (hoop stress) which may be due to pressurisation or centrifugal...
Article
In aerospace industries, on-board electronics are carried during flight, and such equipment must be qualified to withstand the loads to which they are exposed. In this fashion, the knowledge of the different dynamic aspects of excitations and the behavior of structures, components and/or acoustic enclosures are crucial to have controlled and perfor...
Article
Full-text available
The European Green Vehicle project ENLIGHT aims to advance highly innovative lightweight material technologies for application in structural vehicle parts of future volume produced Electric Vehicles (EVs) along four axes: performance, manufacturability, cost effectiveness and lifecycle footprint. The main target is to develop viable and sustainable...
Article
Geometrical acoustics provides a correct solution to the wave equation for rectangular rooms with rigid boundaries and is an accurate approximation at high frequencies with nearly hard walls. When interference effects are important, phased geometrical acoustics is employed in order to account for phase shifts due to propagation and reflection. Erro...
Conference Paper
This work investigates phased geometrical acoustics using a low frequency reflection coefficient. This reflection coefficient, which is derived from an exact solution to a half-space problem, consists of an integral of image sources located at complex coordinates and is valid for any position of the source and receiver above the reflecting plane an...
Chapter
Full-text available
Gearbox failure is among the highest causes of downtime in a wind turbine, causing a significant loss to the wind energy sector, especially in the complex offshore environment. Quite often, the cause of these gearbox and drivetrain errors, as well as other undesired noise and vibrations issues, is premature bearing failure. Therefore, developing mo...
Chapter
Full-text available
As wind turbines continue to grow in size and offshore installations become more and more attractive for investors, the design of reliable drivetrains and gearboxes is becoming very critical. One key element is represented by the challenging environmental conditions, which are significantly different and harsher than those experienced by onshore ma...
Conference Paper
In high speed automotive, aerospace, and railway transportation, the turbulent boundary layer (TBL) is one of the most important sources of interior noise. The stochastic pressure distribution associated with the turbulence is able to excite significantly structural vibration of vehicle exterior panels. They radiate sound into the vehicle through t...
Article
Full-text available
In high speed automotive, aerospace, and railway transportation, the turbulent boundary layer (TBL) is one of the most important sources of interior noise. The stochastic pressure distribution associated with the turbulence is able to excite significantly structural vibration of vehicle exterior panels. They radiate sound into the vehicle through t...
Article
Combining lightweight characteristics with favourable noise and vibration behaviour, locally resonant metamaterials with vibro-acoustic stopband behaviour are gaining increasingly more attention. In view of applicability of metamaterials, this paper investigates the effects of curvature on stopband behaviour. Through derivation of curved unit cell...
Article
The NVH performance of conventional panels and structures is mainly driven by their mass. Silence often requires heavy constructions, which conflicts with the emerging trend towards lightweight design. To face the challenging and often conflicting task of merging NVH and lightweight requirements, novel low mass and compact volume NVH solutions are...
Conference Paper
During last decades the scientific community focused its attention on energy efficiency solutions. Materials have been developed or improved to avoid energy dispersions and new strategies have been developed in order to exploit at best renewable and non renewable energy sources. Other paths are currently followed to pursue the same goal, for instan...
Article
The effect of the damping insertion due to viscoelastic material (VEM) on the dynamic behavior of aluminum panels is assessed in this work. Dynamic mechanical analysis tests are carried out, aiming at characterizing the rheological behavior of a VEM compound. The time–temperature superposition principle is applied and the VEM compound master curve...