Machine Components

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Friedrich M. Wahl - One of the best experts on this subject based on the ideXlab platform.

  • ICRA - Joint actuation based on highly dynamic torque transmission elements - concept and control approaches
    2011 IEEE International Conference on Robotics and Automation, 2011
    Co-Authors: Daniel Kubus, David Inkermann, Thomas Vietor, Friedrich M. Wahl
    Abstract:

    Electric motors clearly constitute the most common drive principle in robotics and mechatronics. Smart materials, however, offer considerably higher power-to-mass ratios than electric motors. If mechanical energy instead of electrical energy can be distributed through a system, highly dynamic and efficient torque transmission elements based on smart materials, e.g. piezoceramics, can be used to transmit torque from an input to an output element. Just like electric motors, they can thus provide position, velocity, and force-torque control of the output element. This paper introduces Machine Components, called adaptronic couplers, which can transmit variable torques highly dynamically from an input element to an output element employing static and/or dynamic friction. In the long run, systems (e.g. robots) based on these Machine Components are envisaged to compete with systems based on classic drive principles - especially electric motors - w.r.t. dynamics and power-to-mass-ratio. Apart from the concept itself, this paper addresses different control approaches and discusses their influence on energy consumption and wear. Moreover, various experimental results proving the basic concept are presented.

  • Joint actuation based on highly dynamic torque transmission elements - concept and control approaches
    Robotics and Automation (ICRA), 2011 IEEE International Conference on, 2011
    Co-Authors: Daniel Kubus, David Inkermann, Thomas Vietor, Friedrich M. Wahl
    Abstract:

    Electric motors clearly constitute the most common drive principle in robotics and mechatronics. Smart materials, however, offer considerably higher power-to-mass ratios than electric motors. If mechanical energy instead of electrical energy can be distributed through a system, highly dynamic and efficient torque transmission elements based on smart materials, e.g. piezoceramics, can be used to transmit torque from an input to an output element. Just like electric motors, they can thus provide position, velocity, and force-torque control of the output element. This paper introduces Machine Components, called adaptronic couplers, which can transmit variable torques highly dynamically from an input element to an output element employing static and/or dynamic friction. In the long run, systems (e.g. robots) based on these Machine Components are envisaged to compete with systems based on classic drive principles - especially electric motors - w.r.t. dynamics and power-to-mass-ratio. Apart from the concept itself, this paper addresses different control approaches and discusses their influence on energy consumption and wear. Moreover, various experimental results proving the basic concept are presented.

B Buecken - One of the best experts on this subject based on the ideXlab platform.

  • wear resistance of prenitrided hardcoated steels for tools and Machine Components
    Surface & Coatings Technology, 1997
    Co-Authors: K Hock, H J Spies, B Larisch, G Leonhardt, B Buecken
    Abstract:

    Abstract Hardened and tempered low-alloy steel 31CrMoV9 and the high-alloy tool steels S 6-5-2 and X155CrMoV121 were nitrided to form a varied structure of the substrate for the subsequent hardcoating. The tool steels were nitrided and hardcoated in a continuous process in a modified commercial PVD plant. The duplex treatment of the low-alloy steel was realized by separate nitriding and hardcoating in different plants. The TiN and CrN were deposited with a thickness of approx. 3 μm by hollow cathode discharge evaporation. The composition and structure of the nitrided case, the interstage treatment before deposition, as well as the deposition parameters influence the properties of the composite. The adhesion can be improved essentially by prenitriding and deposition of a gradient interlayer system. The resistance of the tool steels to metal cutting and forming increases due to the production of an application-specific duplex layer. The resistance to sliding wear and contact fatigue was investigated on various duplex-treated low-alloy steel by nitriding the substrate. Whereas the nitrided case has a very high influence on the contact fatigue limit, the hardcoating reduces the wear by sliding and abrasion, which is of special interest for Machine Components with higher slip.

Adam Nieslony - One of the best experts on this subject based on the ideXlab platform.

  • determination of fragments of multiaxial service loading strongly influencing the fatigue of Machine Components
    Mechanical Systems and Signal Processing, 2009
    Co-Authors: Adam Nieslony
    Abstract:

    Abstract The paper presents a method for determination of multiaxial load segments from original service histories, where the loaded Machine part is meaningfully subjected to fatigue damage. These load segments are directly separated from a service-loading history, which can be of a random character. Typical procedures used for fatigue life assessment under multiaxial random loading are implemented to perform this task. While reduction from the multiaxial stress state to the equivalent uniaxial one, application of the linear multiaxial fatigue failure criteria was proposed. The equivalent stress history is subjected to the rainflow cycle-counting method, which allows to determine the amplitudes and mean values of counted cycles, their occurrence moment and time of duration. Influence of the stress mean value was taken into consideration with the Morrow's model. On the assumption of the linear Palmgren–Miner hypothesis of damage accumulation and the stress–life fatigue characteristics of the material, the damage-time function was determined. The load segments, where the influence on the material fatigue was significant, were determined on the basis of the fixed damage-intensity level and the proposed damage-intensity function. The presented method was studied on a hook loaded with two independent forces. FEM program which has the possibility to perform fatigue analysis was used during the computation for determining the expected place of crack initiation. The service-loading course was compressed to shorter one, so that only a small decrease of the fatigue damage in comparison with full length of the original service loading was observed. The proposed method seems to be right for preparing multiaxial loading histories in order to cut down the fatigue tests, especially in the case when the correlation between particular loading channels is very important.

V Sugumaran - One of the best experts on this subject based on the ideXlab platform.

  • Machine learning approach for automated visual inspection of Machine Components
    Expert Systems With Applications, 2011
    Co-Authors: S Ravikumar, K I Ramachandran, V Sugumaran
    Abstract:

    Visual inspection on the surface of Components is a main application of Machine vision. Visual inspection finds its application in identifying defects such as scratches, cracks bubbles and measurement of cutting tool wear and welding quality. Machine learning approach to Machine vision helps in automating the design process of Machine vision systems. This approach involves image acquisition, preprocessing, feature extraction and classification. Study shows a library of features, and classifiers are available to classify the data. However, only the best combination of them can yield the highest classification accuracy. In this study, images with different known conditions were acquired, preprocessed, and histogram features were extracted. The classification accuracies of C4.5 classifier algorithm and Naive Bayes algorithm were compared, and results are reported. The study shows that C4.5 algorithm performs better.

Mirko Rinchi - One of the best experts on this subject based on the ideXlab platform.

  • wear resistance of blades in planetary concrete mixers design of a new improved blade shape and 2d validation
    Tribology International, 2016
    Co-Authors: Maria Cristina Valigi, Silvia Logozzo, Mirko Rinchi
    Abstract:

    Abstract Wear of Machine Components is one of the main phenomena to control and limit in order to improve the performance and reduce the production costs. In this paper, the optimization of a planetary concrete mixer in terms of wear resistance of blades is proposed and a new design of the mixing blades’ shape is shown and discussed. Experimental tests performed with two stars planetary concrete mixers are described and achieved experimental results are shown. Those results display the progress of blades’ wear over time and prove that the proposed modified blade’s geometry improves the wear resistance and extends the useful-life.