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Classification and analysis of common simplifications in part-scale thermal modelling of metal additive manufacturing processes

Ranjan, R. (author), Langelaar, Matthijs (author), van Keulen, A. (author), Ayas, C. (author)

Computational process modelling of metal additive manufacturing has gained significant research attention in recent past. The cornerstone of many process models is the transient thermal response during the AM process. Since deposition-scale modelling of the thermal conditions in AM is computationally expensive, spatial and temporal...

journal article 2023

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Reliability of System Identification Techniques to Assess Standing Balance in Healthy Elderly

Pasma, J.H. (author), Engelhart, D. (author), Maier, A.B. (author), Aarts, R.G.K.M. (author), Van Gerven, J.M.A. (author), Arendzen, J.H. (author), Schouten, A.C. (author), Meskers, C.G.M. (author), Van der Kooij, H. (author)

Objectives System identification techniques have the potential to assess the contribution of the underlying systems involved in standing balance by applying well-known disturbances. We investigated the reliability of standing balance parameters obtained with multivariate closed loop system identification techniques. Methods In twelve healthy...

journal article 2016

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A novel ultrasound technique for detection of osteochondral defects in the ankle joint: A parametric and feasibility study

Sarkalkan, N. (author), Loeve, A.J. (author), Van Dongen, K.W.A. (author), Tuijthof, G.J.M. (author), Zadpoor, A.A. (author)

(Osteo)chondral defects (OCDs) in the ankle are currently diagnosed with modalities that are not convenient to use in long-term follow-ups. Ultrasound (US) imaging, which is a cost-effective and non-invasive alternative, has limited ability to discriminate OCDs. We aim to develop a new diagnostic technique based on US wave propagation through...

journal article 2015

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Robust Hand Motion Tracking through Data Fusion of 5DT Data Glove and Nimble VR Kinect Camera Measurements

Arkenbout, E.A. (author), De Winter, J.C.F. (author), Breedveld, P. (author)

Vision based interfaces for human computer interaction have gained increasing attention over the past decade. This study presents a data fusion approach of the Nimble VR vision based system, using the Kinect camera, with the contact based 5DT Data Glove. Data fusion was achieved through a Kalman filter. The Nimble VR and filter output were...

journal article 2015

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Fabrication and characterization of suspended beam structures for SiO2 photonic MEMS

Peters, T.J. (author), Tichem, M. (author)

This paper proposes a microfabrication process for the reliable release of SiO2 beam structures. These structures are intended to be utilized in SiO2 photonic MEMS. A major fabrication challenge is the release of thick (>10 ?m) SiO2 structures with high yield. A single mask process is developed based on temporary reinforcement of the SiO2...

journal article 2015

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Time-Varying Scheme for Non-Centralized Model Predictive Control of Large-scale Systems

Nunez Vicencio, A.A. (author), Ocampo-Martinez, C. (author), Maestre, J.M. (author), De Schutter, B.H.K. (author)

The Non-Centralized Model Predictive Control (NC-MPC) framework refers in this paper to any distributed, hierarchical, or decentralized model predictive controller (or a combination of them) the structure of which can change over time and the control actions of which are not obtained based on a centralized computation. Within this framework, we...

journal article 2015

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Mechanics of Biological Tissues and Biomaterials: Current Trends (editorial)

Zadpoor, A.A. (author)

Investigation of the mechanical behavior of biological tissues and biomaterials has been an active area of research for several decades. However, in recent years, the enthusiasm in understanding the mechanical behavior of biological tissues and biomaterials has increased significantly due to the development of novel biomaterials for new fields...

journal article 2015

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What quantitative mechanical loading stimulates in vitro cultivation best?

Natenstedt, J. (author), Kok, A.C. (author), Dankelman, J. (author), Tuijthof, G.J.M. (author)

Articular cartilage has limited regeneration capacities. One of the factors that appear to affect the in vitro cultivation of articular cartilage is mechanical stimulation. So far, no combination of parameters has been identified that offers the best results. The goal is to review the literature in search of the best available set of...

journal article 2015

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Additively Manufactured Open-Cell Porous Biomaterials Made from Six Different Space-Filling Unit Cells: The Mechanical and Morphological Properties

Ahmadi, S.M. (author), Yavari, S.A. (author), Wauthle, R. (author), Pouran, B. (author), Schrooten, J. (author), Weinans, H. (author), Zadpoor, A.A. (author)

It is known that the mechanical properties of bone-mimicking porous biomaterials are a function of the morphological properties of the porous structure, including the configuration and size of the repeating unit cell from which they are made. However, the literature on this topic is limited, primarily because of the challenge in fabricating...

journal article 2015

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Thermo-Hydrodynamic Analysis of a Plain Journal Bearing on the Basis of a New Mass Conserving Cavitation Algorithm

Alakhramsing, S. (author), Van Ostayen, R.A.J. (author), Eling, R.P.T. (author)

Accurate prediction of cavitation is an important feature in hydrodynamic bearing modeling. Especially for thermo-hydrodynamic modeling, it is crucial to use a mass-conservative cavitation algorithm. This paper introduces a new mass-conserving Reynolds cavitation algorithm, which provides fast convergence and easy implementation in finite...

journal article 2015

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Effect of Alkali-Acid-Heat Chemical Surface Treatment on Electron Beam Melted Porous Titanium and Its Apatite Forming Ability

Bsat, S. (author), Yavari, S. (author), Munsch, M. (author), Valstar, E.R. (author), Zadpoor, A.A. (author)

Advanced additive manufacturing techniques such as electron beam melting (EBM), can produce highly porous structures that resemble the mechanical properties and structure of native bone. However, for orthopaedic applications, such as joint prostheses or bone substitution, the surface must also be bio-functionalized to promote bone growth. In the...

journal article 2015

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A microfluidic AFM cantilever based dispensing and aspiration platform

Van Oorschot, R. (author), Perez Garza, H.H. (author), Derks, R.J.S. (author), Staufer, U. (author), Ghatkesar, M.K. (author)

We present the development of a microfluidic AFM (atomic force microscope) cantilever-based platform to enable the local dispensing and aspiration of liquid with volumes in the pico-to-femtoliter range. The platform consists of a basic AFM measurement system, microfluidic AFM chip, fluidic interface, automated substrate alignment, external...

journal article 2015

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3D Printing with Biomaterials: Towards a Sustainable and Circular Economy

Van Wijk, A.J.M. (author), Van Wijk, I. (author)

Additive manufacturing or 3D printing, manufacturing a product layer by layer, offers large design freedom and faster product development cycles, as well as low startup cost of production, on-demand production and local production. In principle, any product could be made by additive manufacturing. Even food and living organic cells can be...

book 2015

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Non-invasive control interfaces for intention detection in active movement-assistive devices

Lobo-Prat, J. (author), Kooren, P.N. (author), Stienen, A.H.A. (author), Herder, J.L. (author), Koopman, B.F.J.M. (author), Veltink, P.H. (author)

Active movement-assistive devices aim to increase the quality of life for patients with neuromusculoskeletal disorders. This technology requires interaction between the user and the device through a control interface that detects the user’s movement intention. Researchers have explored a wide variety of invasive and non-invasive control...

journal article 2014

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Simultaneous capture of the color and topography of paintings using fringe encoded stereo vision

Zaman, T. (author), Jonker, P.P. (author), Lenseigne, B.A.J. (author), Dik, J. (author)

Introduction: Paintings are versatile near-planar objects with material characteristics that vary widely. The fact that paint has a material presence is often overlooked, mostly due to the fact that we encounter many of these artworks through two dimensional reproductions. The capture of paintings in the third dimension is not only interesting...

journal article 2014

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Scanning Probe Microscope-Based Fluid Dispensing

Ghatkesar, M.K. (author), Perez Garza, H.H. (author), Heuck, F. (author), Staufer, U. (author)

Advances in micro and nano fabrication technologies have enabled fabrication of smaller and more sensitive devices for applications not only in solid-state physics but also in medicine and biology. The demand for devices that can precisely transport material, specifically fluids are continuously increasing. Therefore, integration of various...

journal article 2014

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The influence of water jet diameter and bone structural properties on the efficiency of pure water jet drilling in porcine bone

Den Dunnen, S. (author), Tuijthof, G.J.M. (author)

Using water jets in orthopedic surgery to drill holes in bones can be beneficial due to the absence of thermal damage and the always sharp cut. To minimize operating time and the volume of water that is used, the efficiency (volume of removed bone per added volume of water) of the water jet should be maximized. The goal was to study the effect...

journal article 2014

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A novel self-aligning mechanism to decouple force and torques for a planar exoskeleton joint

Schorsch, J.F. (author), Keemink, A.Q.L. (author), Stienen, A.H.A. (author), Van der Helm, F.C.T. (author), Abbink, D.A. (author)

The design of exoskeletons is a popular and promising area of research both for restoring lost function and rehabilitation, and for augmentation in military and industrial applications. A major practical challenge to the comfort and usability for exoskeletons is the need to avoid misalignment of the exoskeletal joint with the underlying human...

journal article 2014

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Examination of historical paintings by state-of-the-art hyperspectral imaging methods: From scanning infra-red spectroscopy to computed X-ray laminography

Legrand, S. (author), Vanmeert, F. (author), Van der Snickt, G. (author), Alfeld, M. (author), De Nolf, W. (author), Dik, J. (author), Janssens, K. (author)

The development of advanced methods for non-destructive selective imaging of painted works of art at the macroscopic level based on radiation in the X-ray and infrared range of the electromagnetic spectrum are concisely reviewed. Such methods allow to either record depth-selective, element-selective or species-selective images of entire...

journal article 2014

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Quantification of Blood Flow and Topology in Developing Vascular Networks

Kloosterman, A. (author), Hierck, B. (author), Westerweel, J. (author), Poelma, C. (author)

Since fluid dynamics plays a critical role in vascular remodeling, quantification of the hemodynamics is crucial to gain more insight into this complex process. Better understanding of vascular development can improve prediction of the process, and may eventually even be used to influence the vascular structure. In this study, a methodology to...

journal article 2014