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Jürgen Hesselbach

Bio: Jürgen Hesselbach is an academic researcher from Braunschweig University of Technology. The author has contributed to research in topics: Parallel manipulator & Robot. The author has an hindex of 16, co-authored 73 publications receiving 899 citations.


Papers
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Journal ArticleDOI
TL;DR: A new methodology to synthesize hybrid robots as a whole structure is presented based on Assur groups as the simplest basic blocks to build kinematic chains, which results in hybrid robots whose structures are as simple as possible.

66 citations

Journal ArticleDOI
TL;DR: In this paper, the main part of the micro-assembly station consists of a spatial parallel structure with three translational degrees of freedom, and an additional rotational axis is integrated into the working platform.
Abstract: This paper presents a concept for a micro‐assembly station and shows different possibilities for increasing the positioning accuracy. The main part of the station consists of a spatial parallel structure with three translational degrees of freedom. An additional rotational axis is integrated into the working platform. This structure is constructed with low friction joints, which are nearly free of backlash. The construction of these high precision joints is presented and the characteristics of the robot such as workspace and resolution are discussed. After this an approach for increasing the accuracy of parallel robots by integrating flexure hinges into the structure is described.

54 citations

Journal ArticleDOI
TL;DR: A new kinematic model describing the motion of the human forearm bones, ulna and radius, during forearm rotation is introduced and the model is enlarged to include angulations of the forearm bones.

51 citations

Journal ArticleDOI
TL;DR: An axial torsional deformity of the radius of >30° causes a statistically significant loss of forearm rotation in fresh cadavers.
Abstract: Objective The aim of this experimental study was to measure the exact influence of isolated torsional deformities at the middle third of the radial shaft on the rotation of the forearm. Design Biomechanical study in cadavers. Setting Trauma Surgery Research Laboratories at the Medical School of Hannover, Hannover, Germany. Intervention Fourteen intact and fresh cadaver specimens were fixed in a newly developed apparatus that allowed free pronation and supination. A ring fixator was applied to the radial shaft with K-wires that allowed us to stabilize torsional deformities in steps of 10 degrees. The middle of the radial shaft was osteotomized via a small soft tissue window, leaving the other soft tissues, including the interosseous membrane, intact. Main outcome measurement Supination and pronation were measured using a goniometer in a standardized fashion. Results The mean (standard deviation) supination value before osteotomy of the radius was 71.6 degrees (15.2 degrees), and the mean (standard deviation) pronation value was 64.5 degrees (12.4 degrees). Radial osteotomy caused no significant difference in the range of motion before creation of torsional deformities. Supination torsional deformities >30 degrees showed a significant loss of pronation. In turn, pronation torsional deformities >30 degrees resulted in a significant loss of supination. The amount of mean rotational loss was approximately the same in the respective pronation and supination torsional deformities. Conclusion An axial torsional deformity of the radius of >30 degrees causes a statistically significant loss of forearm rotation in fresh cadavers.

41 citations


Cited by
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Journal ArticleDOI
TL;DR: A systematic overview of the state of the art in energy and resource efficiency increasing methods and techniques in the domain of discrete part manufacturing, with attention for the effectiveness of the available options is provided in this paper.
Abstract: A B S T R A C T This paper aims to provide a systematic overview of the state of the art in energy and resource efficiency increasing methods and techniques in the domain of discrete part manufacturing, with attention for the effectiveness of the available options. For this purpose a structured approach, distinguishing different system scale levels, is applied: starting from a unit process focus, respectively the multi-machine, factory, multi-facility and supply chain levels are covered. Determined by the research contributions reported in literature, the de facto focus of the paper is mainly on energy related aspects of manufacturing. Significant opportunities for systematic efficiency improving measures are identified and summarized in this area. 2012 CIRP.

936 citations

Journal ArticleDOI
TL;DR: In this paper, the authors provide a general overview of the current and most innovative uses of food supply chain waste, providing a range of worldwide case-studies from around the globe.
Abstract: Increasing demand for fuels and chemicals, driven by factors including over-population, the threat of global warming and the scarcity of fossil resources, strains our resource system and necessitates the development of sustainable and innovative strategies for the chemical industry. Our society is currently experiencing constraints imposed by our resource system, which drives industry to increase its overall efficiency by improving existing processes or finding new uses for waste. Food supply chain waste emerged as a resource with a significant potential to be employed as a raw material for the production of fuels and chemicals given the abundant volumes globally generated, its contained diversity of functionalised chemical components and the opportunity to be utilised for higher value applications. The present manuscript is aimed to provide a general overview of the current and most innovative uses of food supply chain waste, providing a range of worldwide case-studies from around the globe. These studies will focus on examples illustrating the use of citrus peel, waste cooking oil and cashew shell nut liquid in countries such as China, the UK, Tanzania, Spain, Greece or Morocco. This work emphasises 2nd generation food waste valorisation and re-use strategies for the production of higher value and marketable products rather than conventional food waste processing (incineration for energy recovery, feed or composting) while highlighting issues linked to the use of food waste as a sustainable raw material. The influence of food regulations on food supply chain waste valorisation will also be addressed as well as our society's behavior towards food supply chain waste. “There was no ways of dealing with it that have not been known for thousands of years. These ways are essentially four: dumping it, burning it, converting it into something that can be used again, and minimizing the volume of material goods – future garbage – that is produced in the first place.” William Rathje on waste (1945–2012) – Director of the Tucson Garbage project.

879 citations

Journal ArticleDOI
TL;DR: An estimation of the global electricity usage that can be ascribed to Communication Technology between 2010 and 2030 suggests that CT electricity usage could contribute up to 23% of the globally released greenhouse gas emissions in 2030.
Abstract: This work presents an estimation of the global electricity usage that can be ascribed to Communication Technology (CT) between 2010 and 2030. The scope is three scenarios for use and production of consumer devices, communication networks and data centers. Three different scenarios, best, expected, and worst, are set up, which include annual numbers of sold devices, data traffic and electricity intensities/efficiencies. The most significant trend, regardless of scenario, is that the proportion of use-stage electricity by consumer devices will decrease and will be transferred to the networks and data centers. Still, it seems like wireless access networks will not be the main driver for electricity use. The analysis shows that for the worst-case scenario, CT could use as much as 51% of global electricity in 2030. This will happen if not enough improvement in electricity efficiency of wireless access networks and fixed access networks/data centers is possible. However, until 2030, globally-generated renewable electricity is likely to exceed the electricity demand of all networks and data centers. Nevertheless, the present investigation suggests, for the worst-case scenario, that CT electricity usage could contribute up to 23% of the globally released greenhouse gas emissions in 2030.

644 citations

Journal ArticleDOI
TL;DR: In this article, the authors tried to read modelling and control of robot manipulators as one of the reading material to finish quickly, and they found that reading book can be a great choice when having no friends and activities.
Abstract: Feel lonely? What about reading books? Book is one of the greatest friends to accompany while in your lonely time. When you have no friends and activities somewhere and sometimes, reading book can be a great choice. This is not only for spending the time, it will increase the knowledge. Of course the b=benefits to take will relate to what kind of book that you are reading. And now, we will concern you to try reading modelling and control of robot manipulators as one of the reading material to finish quickly.

517 citations

Journal ArticleDOI
20 Nov 2019-Joule
TL;DR: In this article, the authors show that the necessity for EOL recycling is underpinned by leveraging fluctuating material costs, uneven distribution and production, and the transport situation, and suggest potential improvements in the process through mutual efforts from academia, industry, and governments.

428 citations