Searched for: contributor%3A%22Herder%2C+J.L.+%28mentor%29%22
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Stavenuiter, R.A.J. (author)
Underactuated graspers are known for their self-adaptability. The final configuration of the grasper in which it obtains a stable grasp relies on the static equilibrium of the grasper and object. Any external or inertial force that acts on the object disturbs this static equilibrium and causes a change in the configuration of the grasper. The...
master thesis 2013
document
Oortwijn, P.T. (author)
Vibration in moving mechanisms and manipulators is almost always present due to manufacturing tolerances, assembly errors and non-uniform density of materials. Small errors in parameters such as mass and length may result in a non-balanced mechanism producing shaking forces. Normally a mechanism would be balanced using a trial and error method,...
master thesis 2013
document
Van Leeuwen, L.J. (author)
Fatigue tests are a very time consuming process in engineering, in which also a lot of energy is required. Speeding up fatigue tests and making them less energy consuming, would lead to major profits. The aim of this study is to obtain these profits by the development of a new bending fatigue test. In addition, the objective is to apply this new...
master thesis 2013
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Lassooij, J. (author)
The Minimally Invasive Manipulator (MIM) copies the movements of the hands of the surgeon to the tip of the instrument inside the operating area. The movement is mechanically copied using cables and pulleys. When the surgeon grasps and holds an object, the friction inside the MIM increases and distorts the force feedback in the remaining degrees...
master thesis 2012
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De Paula Pellegrini, S. (author)
This thesis brings together, for the first time, the fields of energy harvesting and static balancing. The proposal of two new architectures for the design of mechanical oscillators is supported by an extensive review on the existing energy harvesters. For the first one, a statically balanced oscillator, an analytically study proved it to be...
master thesis 2012
document
Pluimers, P.J. (author)
Precision engineering impacts every one, every day, by enabling the fabrication techniques and functions required for 21st technological revolutions. Various applications, from display technologies to sensor systems to optical networks make use of so called microelectromechanical systems (MEMS). Motions at micro level with monolithic structures...
master thesis 2012
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Bijlsma, B.G. (author)
A gravity equilibrator is a statically balanced system which is designed to counterbalance a mass such that any preferred position is eliminated and thereby the required operating effort to move the mass is greatly reduced. Current spring-to-mass gravity equilibrators are limited in their range of motion as a result of design limitations. An...
master thesis 2012
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Arkenbout, E.A. (author)
master thesis 2012
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Dunning, A.G. (author)
This paper presents the first zero stiffness six degrees of freedom (DoF) compliant precision stage. To deal with problems like backlash, friction and lubrication for performing ultra-precise positioning in a vacuum environment, a novel compliant structure is proposed. All six degrees of freedom are statically balanced (i.e. near zero stiffness)...
master thesis 2011
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Broeze, W.H. (author)
Lifting patients is a demanding task for care providers. In addition, the number of patients is rising and the number of people with obesity is expanding. Current lifting aids are single purpose and time consuming to use. Exoskeletons can fulfill the demand for a versatile and easy to use lifting aid. A drawback of a typical exoskeleton is that...
master thesis 2011
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Van Osch, F.J.C. (author)
Static balancing is a useful concept to reduce operating effort in mechanisms. A statically balanced system which is designed to counterbalance a mass, is referred to as a gravity equilibrator. The potential energy in a gravity equilibrator is constant, which in most of the times is achieved by mechanical springs. Often helical springs are used,...
master thesis 2011
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Rijff, B.L. (author)
A gravity balancer is a mechanism that compensates the weight of a mass over a range of motion. When no friction is present, this gives an energy efficient mechanism and little effort is required to move an object. Conventional mechanisms have drawbacks due to the use of conventional rigid joints. Compliant joints do not have these disadvantages...
master thesis 2010
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Chang, Y.T. (author)
The particular category of the underactuated grippers is chosen for the automation of the item picking in distribution centers. The underactuated grippers have fewer degrees of actuation than degrees of freedom, so they are mechanically simpler than the fully-actuated grippers, and they are able to adapt to objects regardless of their shapes....
master thesis 2010
document
Appels, M.J. (author)
In this paper a new friction model for the pre-sliding regime of dry friction is proposed. Current highly accurate friction models that incorporate analysis of the pre-sliding friction regime are all dynamic models. In these models the pre-sliding regime seems to be underdeveloped. The main focus of the models lies upon the analysis of the...
master thesis 2010
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Nai, T.Y. (author)
Meniscectomy is a medical procedure where ruptured meniscal tissue is removed within the knee joint. The con- ventional cutters fail to reach the entire meniscus. Therefore, the focus of this study is to create a cutter with a steerable tip, which allows sideway steering to increase the reacha- bility within the knee joint. Additionally, this...
master thesis 2010
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Steutel, P. (author)
The majority of existing problems within conventional prosthetic fingers are related to the use of conventional rigid links and kinematic joints and to the lack of adaptability of the finger. In this paper these problems are solved by the design of a fully compliant under-actuated prosthetic finger. At first a basic structure was defined....
master thesis 2010
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Van Drunen, A. (author)
master thesis 2008
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Euwe, F.E. (author)
Patients with foot deformation, cartilage wear or a badly healed calcaneus fracture often suffer from severe pain in the foot. After fixation of the subtalar joint, which stabilizes motion, most patients can walk without pain again. Because the curtent operation is an open approach, it is difficult to reach the entire joint space and to remove...
master thesis 2007
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Schenk, M. (author)
The fields of static balancing and tensegrity structures are combined into statically balanced tensegrity mechanisms. This combination results in a new class of prestressed structures that behave like mechanisms: although member lengths and orientations change, they can be deformed into a wide range of positions, while continuously remaining in...
master thesis 2006
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