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    Item type:Publication, Access status: with files ,
    On the origin of passive rotation in rotational joints, and how to calculate it
    (Wiley-VCH, 2019-11-18)
    Du, Shucen
    ;
    Schlattmann, Josef
    ;
    Schulz, Stefan
    ;
    Seibel, Arthur
    In this paper, a computation method for the output shaft’s rotation of a passive rotational joint, especially of one that is deployed on a parallel mechanism, is investigated. As an alternative to typical geometric or screw theory methods, we propose a new approach that is based on the comparison between any passive rotational joint with a reference spherical joint. As examples, we apply our method to a universal joint and a novel double joint whose passive rotation is difficult to calculate with traditional methods. c 2019 The Authors Proceedings in Applied Mathematics & Mechanics published by Wiley-VCH Verlag GmbH & Co. KGaA Weinheim
    Publicationtype: Conference Paper
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    Item type:Publication, Access status: without files ,
    Passive Rotation of Rotational Joints and Its Computation Method
    (Springer, 2019)
    Du, Shucen
    ;
    Schlattmann, Josef
    ;
    Schulz, Stefan
    ;
    Seibel, Arthur
    This paper discusses the equivalence condition of the input and output rotation of a passive rotational joint and provides a general method to compute the output rotation angle. In a Stewart-Gough platform, the fixed base platform is usually connected to the moveable manipulator platform by six identical kinematic chains consisting of rotational joints and linear actuators. When using lead screws for the linear actuators, possible passive rotations of the rotational joints can be harmful because they may lead to additional length variations of the linear actuators or cause extra stresses if the rotations are obstructed. This paper provides a for computing these passive rotations by using vector comparison and demonstrates its application on the examples of a universal joint, a Rzeppa joint, and a Tracta joint.
    Publicationtype: Conference Paper
      209
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    Item type:Publication, Access status: with files ,
    Friction-induced vibrations during tightening of bolted joints : analytical and experimental results
    (Multidisciplinary Digital Publishing Institute (MDPI), 2018-12-05)
    Baramsky, Nicolaj
    ;
    Seibel, Arthur
    ;
    Schlattmann, Josef
    Bolted joints are one of the most used machine elements. Holding together structures of all sizes, the integrity rests on their shoulders. Thus, an accurate and reliable assembly of the joint is crucial. While it is the aim to not experience friction-induced vibrations at all, at some situations, it is unavoidable. These cases, however, have yet been out of the focus of control algorithms due to the volatile nature of the process. This contribution delivers analytical and experimental results for the occurrence of friction-induced vibrations during tightening of bolted joints. Previous findings of system characteristic constants could be validated, which can be used to monitor the tightening process even while strong vibrations during the tightening process occur. Additionally, a real-time algorithm is presented which allows for an advanced process monitoring and control by identifying process characteristics based on which predictions of the process can be made. These measures significantly improve the capabilities to reach the target values of the tightening process.
    Publicationtype: Journal Article
      281  364