Wim Desmet

Wim Desmet
KU Leuven | ku leuven · Department of Mechanical Engineering

PhD

About

805
Publications
158,923
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9,760
Citations
Citations since 2016
318 Research Items
6137 Citations
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201620172018201920202021202202004006008001,000

Publications

Publications (805)
Chapter
Full-text available
In the wind energy industry, wind turbines are subject to enormous mechanical loads and extreme environmental conditions during operation, which is why damage detection methodologies play a vital role in their operation. In order to reduce costs and guarantee the integrity and longevity of such structures, the use of a reliable Structural Health Mo...
Article
A novel approach is presented for the time-domain system identification of structural dynamic components exploiting the high spatial density of vision-based measurements. By using spatially dense measurements, the number of spatial measurement points is much larger than the dimensionality of the underlying dominant dynamics (i.e., the number of mea...
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...
Article
In the search for lightweight and compact structures with favorable vibro-acoustic performance, periodic structures such as phononic crystals and locally resonant metamaterials have shown potential. Recently, these periodic structures are included between two panels in a sandwich configuration to combine the interesting vibro-acoustic performance o...
Chapter
Full-text available
In recent years, periodic structures such as metamaterials and phononic crystals have come to the fore in the search for innovative lightweight and compact noise and vibration solutions. The vibro-acoustic performance of these structures is often analyzed by means of dispersion curves and/or sound transmission loss calculations, using unit cell mod...
Article
Full-text available
Metamaterials have recently emerged and shown great potential for noise and vibration reduction in specific frequency ranges, called stop bands. To predict stop bands, their often periodic nature is exploited and dispersion curves are calculated based on a single representative unit cell, typically modeled using the finite element method. Since the...
Article
Full-text available
At present, black-box and simulation-based optimization problems with multiple objective functions are becoming increasingly common in the engineering context. In many cases, the functional relationships that define the objective and constraints are only known as black-boxes, cannot be differentiated accurately, and may be subject to unexpected fai...
Article
Locally resonant metamaterials (LRMs) have recently emerged and shown potential in the field of noise control engineering, given their superior noise and vibration reduction performance in tunable frequency ranges, referred to as stop bands. This paper aims to experimentally assess the potential of LRMs to suppress flow-induced noise and vibration...
Article
Full-text available
Over the years, metamaterials have shown their potential in a wide range of different disciplines, e.g. optics, electromagnetics, dynamics etc. Metamaterials are, often periodic, engineered structures made of conventional materials but which exhibit properties not encountered in nature. In the field of noise and vibration, metamaterials have receiv...
Article
In the original publication, the captions of Figures 4 and 5 are correct, but the graphs have been erroneously switched between both figures. In the corrected version below, Figure 4 correctly shows the result of the lattice-based UC in which the computation times of the ROMs exceed the computation time of the FOM, while Figure 5 correctly shows th...
Conference Paper
Full-text available
In the search for lightweight and compact partitions with both favorable vibro-acoustic characteristics and load-carrying capacity, an increasing trend towards double-leaf panels with structural metamaterial cores is emerging. Generally, these partitions are designed and analyzed by only considering the attenuation along the structural path, disreg...
Article
The frequency response of vibro-acoustic systems can be improved by using various forms of damping materials. Their material properties are typically varying with the excitation frequency and are introduced by one or multiple complex-valued functions. Numerical models of such systems are typically large and require efficient solving strategies. In...
Article
In recent years, a wide variety of inhomogeneous periodic structures including locally resonant metamaterials and phononic crystals have come to the fore in the search for innovative noise and vibration solutions which are lightweight and compact. With the often intricate design of these periodic cells, noise and vibration attenuation is achieved i...
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
Modeling and simulation of mechatronic systems require a multi-disciplinary approach as several physical domains interact with each other. Due to this heterogeneity, each domain can benefit from a dedicated time integration strategy as well as modeling formalism to control the error in simulation and reduce computational overhead. Current multi-rat...
Article
Frequency response functions (FRF) are valuable structure characterizations that are used for the study of noise and vibration, load identification, modal analysis or model updating. They are usually estimated as mobilities by exciting the structure and measuring the normalized response for each frequency. However, rotational degrees of freedom (DO...
Article
Full-text available
In cementless Total Hip Arthroplasty (THA), achieving high primary implant fixation is crucial for the long-term survivorship of the femoral stem. While orthopedic surgeons traditionally assess fixation based on their subjective judgement, novel vibration-analysis fixation-monitoring techniques show promising potential in providing the surgeon with...
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
New applications, such as material characterization, auralization and virtual sensing, have renewed the need and interest in efficient transient time-domain simulations of dynamical systems. However, the typical required numerical simulations for these applications are cumbersome to compute due to the high computational burden involved in the calcu...
Conference Paper
Full-text available
Individual Head Related Transfer Functions (HRTFs), necessary for the realistic audio rendering of a virtual scene, can be efficiently computed using numerical methods on three-dimensional scans of the ears and head of a subject. However, accurate geometries are required to obtain perceptually valid HRTFs. The most precise scanning techniques gener...
Article
This paper presents a numerical analysis of the aeroacoustic instabilities in a slit-type Helmholtz resonator subjected to a low Mach number grazing flow. This configuration can be susceptible to nonlinear feedback phenomena due to the mutual coupling between the aerodynamic and acoustic fields in the proximity of the slit. The aeroacoustic flowfie...
Article
Full-text available
Torsional vibrations play a critical role in the design and operation of a mechanical or mechatronic drivetrain due to their impact on lifetime, performance, and cost. A magnetic spring allows one to reduce these vibrations and improve the actuator performance yet introduces additional challenges on the identification. As a direct torque measuremen...
Article
Full-text available
A numerical approach to predict broadband trailing-edge noise for low Mach number flows is presented. It is based on the combination of a Helmholtz solver to propagate sound waves with a sound source term computed stochastically. The sound propagation is performed in the frequency domain using a high-order finite element solver. The stochastic appr...
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...
Article
Transient responses impose additional restrictions concerning model order reduction of acoustic finite element systems. Time-stable model order reduction methods achieve model compaction while guaranteeing frequency domain models transform in a physically meaningful way. Efficiency and stability are of course of little consequence if the model is r...
Conference Paper
In the search for lightweight solutions with favourable noise and vibration attenuation, locally resonant vibro-acoustic metamaterials have emerged as a promising candidate due to their stop band behaviour. When used in a sound transmission context, vibro-acoustic metamaterial panels allow to greatly improve the acoustic insulation in a targeted fr...
Article
The current trends in the automotive industry toward electric vehicles are creating increasing interest on methods to quantify and predict the noise, vibration and harshness (NVH) behavior caused by road noise, as well as secondary noise sources. In this regard, component-based TPA (Transfer Path Analysis) has been recently explored. It is a powerf...
Article
Full-text available
Objective: The level of primary implant fixation in cementless total hip arthroplasty is a key factor for the longevity of the implant. Vibration-based methods show promise for providing quantitative information to help surgeons monitor implant fixation intraoperatively. A thorough understanding of what is driving these changes in vibrational beha...
Article
Full-text available
To comply with the increasing complexity of new mechatronic systems and stricter safety regulations, advanced estimation algorithms are currently undergoing a transformation towards higher model complexity. However, more complex models often face issues regarding the observability and computational effort needed. Moreover, sensor selection is often...
Article
The direct measurement of the external loads acting on a mechanical component represents often a challenge in many engineering applications. In this context, the attention of many researchers is focused on the field of inverse load identification. Several techniques are proposed in literature to address this problem by means of experimental methodo...
Conference Paper
Metamaterials have recently emerged and shown great potential for noise and vibration reduction in specific frequency ranges, called stop bands. To predict stop bands, their often periodic nature is exploited and dispersion curves are calculated based on a single representative unit cell, typically modelled using the finite element method. Since th...
Article
Full-text available
In general, multibody models are described with a set of redundant coordinates and additional constraints. Their dynamics is thus expressed through differential algebraic equations. As an alternative, the minimal coordinate formulation permits to describe a rigid system with the minimal number of variables leading to ordinary differential equations...
Conference Paper
In this paper we study the application of high-speed cameras for the measurement of the acoustic radiation of (baffled) plates and plate-like structures, independent of their mechanical boundary conditions. High-speed cameras offer contact-less, transient and spatially dense displacement measurements. We use the measured displacement as boundary co...
Conference Paper
View Video Presentation: https://doi.org/10.2514/6.2021-2148.vid The noise emissions from lightweight duct systems are influenced by the aero-acoustic field and the induced vibrations of the duct walls. Therefore, accounting for the interaction between acoustics, structural dynamics, and aerodynamics is crucial for the design of performant noise mi...
Conference Paper
View Video Presentation: https://doi.org/10.2514/6.2021-2274.vid In the search for novel Noise, Vibrations and Harshness (NVH) solutions, vibro-acoustic locally resonant metamaterials (LRMs) have recently emerged, combining a good NVH behavior and a lightweight design in desired frequency regions, referred to as stop bands i.e.\ frequency zones of...
Conference Paper
View Video Presentation: https://doi.org/10.2514/6.2021-2268.vid By downsizing perforation dimensions to the sub-millimeter range, micro-perforated panels exhibit high enough acoustic resistance to be used without the addition of porous damping material. As a result, they can be used to design more compact acoustic wall treatments for flow duct app...
Conference Paper
Full-text available
Metamaterials, i.e. artificial structures with unconventional properties, have shown to be highly potential lightweight and compact solutions for the attenuation of noise and vibrations in targeted frequency ranges, called stop bands. In order to analyze the performance of these metamaterials, their stop band behavior is typically predicted by mean...
Article
Resonant metamaterials have recently emerged as lightweight and performant noise and vibration solutions for the hard-to-address low-frequency ranges. These engineered materials are made by an assembly of resonant elements onto a host structure. Their interaction leads to tuneable frequency ranges, known as stop bands, in which they can outperform...
Article
Full-text available
Recently, the potential of metamaterials and phononic crystals to cope with conflicting requirements of obtaining lightweight structures with desirable noise and vibration properties has been demonstrated. These, often periodic, structures are commonly studied based on their representative unit cell of which the vibro-acoustic performance is examin...
Article
Full-text available
Model-based force estimation is an emerging methodology in the mechatronic community given the possibility to exploit physically inspired high-fidelity models in tandem with ready-to-use cheap sensors. In this work, an inverse input load identification methodology is presented combining high-fidelity multibody models with a Kalman filter-based esti...
Conference Paper
Full-text available
The industrial application of lightweight materials is increasing across many industries such as the automotive, the aerospace and the renewable energy sector. This growth brings new challenges for efficient and reliable damage detection. The advancements of both Machine Learning (ML) algorithms and Non-Destructive Testing (NDT) techniques offer th...
Article
This paper presents a way to obtain angle-dependent reflection, transmission and absorption coefficients of a sample based on the modal decomposition method in a rectangular waveguide. Microphone locations are optimized to ensure that the modal decomposition can be applied. The method is subsequently validated both numerically and experimentally.
Article
Full-text available
Measuring the operational torques during the lifetime of a wind turbine gearbox offers a valuable source of information for design, monitoring, predictive maintenance and control, and can help reduce operational expenses and downtime. In this paper we investigate indirect sensing as a valuable alternative to direct sensing, which is costly and intr...
Article
Full-text available
In this paper, a Floquet Model Order Reduction (MOR) method is proposed for the modelling of finite periodic structures subjected to harmonic or transient loads. This Floquet MOR generates frequency-independent projection matrices of the full-scale structure using a Floquet expansion of the local state-vectors computed on a single unit-cell with th...
Article
Full-text available
The optimization problems arising in modern engineering practice are increasingly simulation-based, characterized by extreme types of nonsmoothness, the inaccessibility of derivatives, and high computational expense. While generating set searches (GSS) generally offer a satisfying level of robustness and converge to stationary points, the convergen...
Conference Paper
Full-text available
Virtual sensing procedures have gained increased adoption to combine sensor data with simulation models to estimate physical quantities for which the direct measurements are not feasible, due to cost, accessibility or other restrictions. This is achieved by means of state estimator technology based on linear or non-linear versions of Kalman filters...
Article
Multibody systems [1] are the state‐of‐the‐art tool to model complex mechanical mechanisms. However, they typically include redundant coordinates plus constraints, leading to differential algebraic equations for the dynamics which require dedicated integration schemes and control/estimation algorithms. In the deep learning field, autoencoders are a...
Article
This work presents the design, optimization and combination of fully parameterized Archimedean spiral cavities (ASCs) as acoustic resonators, in order to achieve perfect absorption at frequencies below 1000 Hz while using a completely modular design. The assembly of two ASCs in the same system is also presented. An optimization is performed and res...
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
Among the proposed formulations for rigid multibody dynamics, the minimal coordinates approach permits to parametrize the system motion with the minimal amount of degrees of freedom without the need of additional constraints equations. This leads to a system of ordinary differential equations to describe the motion which enables a straightforward c...
Chapter
Virtual sensing is an emerging technology with a wide application potential for the industry. The combination of sensor measurement data with simulation models allows the estimation of physical quantities, of which a direct measurement is not feasible, for reasons of, e.g., cost and accessible space. The estimated physical quantities can be system...
Conference Paper
Full-text available
Due to the increasing vehicle variants, shorter development cycles, and limited availability of prototypes, the automotive industry is seeking for alternative technologies to predict the contribution of vehicle components (engine, intake, exhaust, tyres, etc.) upfront, early in the development process. Component-based TPA is a relatively new TPA ap...
Book
Full-text available
An increasing complexity of models used to predict real-world systems leads to the need for algorithms to replace complex models with far simpler ones, while preserving the accuracy of the predictions. This three-volume handbook covers methods as well as applications. This third volume focuses on applications in engineering, biomedical engineering,...
Conference Paper
The characterization of poroelastic materials typically requires various dedicated tests to estimate all necessary material parameters. Therefore, a characterization is linked with a lot of effort and usually it is not possible to perform in a standard acoustic laboratory. However, for designing vibro-acoustic systems that include poroelastic mater...