Searched for: subject%3A%22Static%255C+balance%22
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Tromp, Jos (author)
The range of motion of elastic energy sources is limited by the size of its transmission system. To enhance this range of motion without compromising the size, previous research introduced a frequency doubling mechanism with the intention to concatenate these mechanisms. This study serves to achieve higher numbers of frequency multiplication by...
master thesis 2023
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Klok, J.W.A. (author), Postema, R.R. (author), Steintorsson, Astor T. (author), Dankelman, J. (author), Horeman, T. (author)
In laparoscopic surgery, quality of haptic feedback is reduced compared to conventional surgery, leading to unintentional tissue damage during grasping. From the perspective of haptics, poor mechanical design of laparoscopic instrument joints induces friction and a nonlinear actuation-tip force relation. In this study, a novel laparoscopic...
journal article 2023
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Kok, Sjaak (author), Amoozandeh, A. (author), Radaelli, G. (author)
Elastic structures that can deflect without springback, known as neutrally stable structures, form a remarkable group within their field, since they require the energetic state to remain unchanged during elastic deformation. Several examples in the literature obtain this state of neutral stability by the application of pre-stress, either as a...
journal article 2023
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van Nes, Sjors (author)
In this work, the possibilities to approach various nonlinear moment-angle characteristics with a kinematically indeterminate rigid body balancer with torsion springs are examined. These torsion springs are mounted on the axes that intersect the rigid bodies. The rigid body balancer is coupled to an inverted pendulum. Although the kinematic...
master thesis 2022
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Numic, A. (author), Blad, Thijs (author), van Keulen, A. (author)
In this paper, a novel alternative method of stiffness compensation in buckled mechanisms is investigated. This method involves the use of critical load matching, i.e., matching the first two buckling loads of a mechanism. An analytical simply supported five-bar linkage model consisting of three rigid links, a prismatic slider joint, and four...
journal article 2022
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van Wijk, Edward (author)
The goal of this thesis is to look into the possibilities of making origami neutrally stable. This is wanted because the inherent stiffness of origami mechanisms introduces unwanted artifacts such as a higher actuation force, and the mechanism not following the theoretical kinematics. By making an origami mechanism neutrally stable the inherent...
master thesis 2021
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van de Wetering, Erik (author)
In the field of vibration energy harvesting, vibration energy is tranduced to electrical energy to power small, low powered devices. Many energy harvesters are produced in the form of a resonator, where resonant amplification enables efficient operation of the energy harvester. At low frequencies below 10 hz, input motions quickly increase for a...
master thesis 2021
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van de Wetering, E. (author), Blad, Thijs (author), van Ostayen, R.A.J. (author)
In this work, a stiffness compensated piezoelectric vibration energy harvester is modelled and tested for low-frequency excitations and large input amplitudes. Attracting magnets are used to introduce a negative stiffness that counteracts the stiffness of the piezoelectric beam. This results into a nearly statically balanced condition and...
journal article 2021
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Blad, Thijs (author), van Ostayen, R.A.J. (author), Tolou, N. (author)
In this paper a method is demonstrated for tuning the stiffness of building blocks for statically balanced compliant ortho-planar mechanisms. Three post-buckled mechanisms are proposed where the flexural rigidity can be manipulated over a part of their length in order to tune the ratio between the first two critical loads. A sensitivity...
journal article 2021
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van der Wijk, V. (author)
In this paper it is shown how a 2-DoF inherently force balanced spatial deployable Butterfly Linkage is found consisting of four entangled similar Bennett linkages moving synchronously and with the common center of mass in the central joint. This linkage is derived from the Grand 4R Four-Bar Based Inherently Balanced Linkage Architecture by...
book chapter 2021
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Kuppens, P.R. (author), Bessa, M.A. (author), Herder, J.L. (author), Hopkins, J. B. (author)
Stiffness in compliant mechanisms can be dramatically altered and even eliminated entirely by using static balancing. This requires elastic energy to be inserted before operation, which is most often done with an additional device or preloading assembly. Adding such devices contrasts starkly with primary motivations for using compliant...
journal article 2021
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Kuppens, P.R. (author), Bessa, M.A. (author), Herder, J.L. (author), Hopkins, J. B. (author)
We introduce two essential building blocks with binary stiffness for mechanical digital machines. The large scale fully compliant mechanisms have rectilinear and rotational kinematics and use a new V-shaped negative stiffness structure to create two extreme states of stiffness by static balancing. The use of a mechanical bistable switch...
journal article 2021
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Kok, Sjaak (author)
Elastic neutral stability involves elastic deformation without stiffness or loads. It is a remarkable appearance, since the deformation of materials is normally associated with an increase of potential energy and a resulting opposing reaction force or moment. Neutrally stable mechanisms can be used to overcome unnecessary actuation which makes...
master thesis 2020
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Barel, Marije (author)
At this moment there are more than 150 different designs of CMMA in existence. To aid the designer to develop a new or improved CMMA or choose what the design to use, a classification system is developed during the literature research. It is based on the geometrical advantage (GA) of the CMMA, and on the input and output port motion paths. Their...
master thesis 2017
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Radaelli, G. (author)
In this dissertation a collection of concepts to synthesise nonlinear springs is presented. Such springs can be useful in various application domains where, e.g., multi-stability or static balancing is desired. These behaviors are often sought to alleviate the effort required for actuation. The explored concepts are presented by showing the...
doctoral thesis 2017
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Neven, Job (author)
Nowadays, the number of robotic systems grows enormously. In order to execute their task, many of these robots need a fixturing gripper to grasp and hold objects. To reduce the environmental impact, the operational costs, the size of actuators and to improve the uptime of mobile robots, it becomes increasingly important to design robots for a...
master thesis 2017
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Overwijk, T.T. (author)
Static balancing is a technique to create static equilibrium in a mechanism for any configuration. Auxiliary links and many springs are usually added to achieve static balance for spatial parallel mechanisms. This increases inertia and complexity of the system. This paper first presents a theoretically perfect static balancing solution for a...
master thesis 2017
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Radaelli, G. (author), Buskermolen, R. (author), Barents, R (author), Herder, J.L. (author)
This paper presents a method for the design of a statically balanced inverted pendulum. The non-linear moment-rotation characteristic of the pendulum's weight is approximated by a piecewise linear characteristic. Each transition is realized by engaging or disengaging one or more torsion bars, by means of mechanical stops. The whole set of...
journal article 2017
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Radaelli, G. (author), Herder, J.L. (author)
The research on compliant shell mechanisms is a new and promising expansion of the well established compliant mechanisms research area. Benefits of compliant shell mechanisms include being spatial and slender, having organic shapes and their high tailorability of the load-displacement response. This work focusses on the design of a shell with...
journal article 2017
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Robertson, P.D. (author)
Reconfigurable mechanisms are a relatively recent contribution to the field of mechanism design and authors have only just been producing real-life applications of these mechanisms. This paper builds on the application of two categories of reconfigurable mechanisms by applying a generalised static balancing theory suggested in a previous review...
master thesis 2016
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