Temat: active tool - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Controlled turning process for the production of friction-reduced cylinder liners with a defined free-form geometry
Autorzy:: Denkena, Berend
Bergmann, Benjamin
Handrup, Miriam
Schmidt, Christopher
Powiązania:: https://bibliotekanauki.pl/articles/1833769.pdf
Data publikacji:: 2021
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: free-form turning
active cutting tool
friction reduction
Opis:: Friction in the piston-cylinder system of combustion engines has a great influence on fuel consumption. To reduce the friction of combustion engines, free-form cylinder liners and microstructured cylinder liners have proven to be advantageous. However, the combination of both processes is not industrially realized today because of an increased manufacturing effort due to a higher number of process steps. To save resources in form of honing oil in the production, the free-form can be machined by a dry turning process instead of form honing. A combination with the microstructuring process in a single manufacturing step would furthermore reduce non-productive time. This paper presents a piezo-actuated hybrid tool that can carry out both processes. The tool wear and the behavior during free-form fine machining of cylinder liners are investigated. A process control system is introduced that controls the cylinder liner geometry by adapting the process parameters during free-form turning.
Źródło:: Journal of Machine Engineering; 2021, 21, 3; 47--59
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A study of active vibrations damping with the application of active tool
Analiza aktywnej kontroli tłumienia drgań z zastosowaniem aktywnego narzędzia
Autorzy:: Parus, A.
Kasprowiak, M.
Powiązania:: https://bibliotekanauki.pl/articles/94142.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:: vibrations damping
active tool
LMS
piezo actuator
external modulation
tłumienie drgań
aktywne narzędzie
piezo siłownik
regeneracja śladu
Opis:: The article represents a short overview of solutions available on the market, which allow for vibrations damping during the machining process. The description also provides information on the essence of chatter vibrations. The next part of the following paper includes the model of active machine tool based on piezoelectric actuator with work piece and the model of machining process. Next, the results of simulation research are presented for two control systems. All simulations were carried out in Matlab Simulink Software.
Artykuł stanowi krótki przegląd rozwiązań dostępnych na rynku, pozwalających tłumić drgania w trakcie obróbki skrawaniem. W opisie można również znaleźć informacje dotyczące istoty drgań samowzbudnych. Kolejną cześć artykułu stanowi model aktywnego narzędzia na bazie piezoelektrycznego siłownika wraz z przedmiotem obrabianym oraz modelem procesu skrawania. Następnie zaprezentowane zostały wyniki badań symulacyjnych dla dwóch układów sterowania (LQG, LMS). Całość symulacji przeprowadzona została w środowisku Matlab Simulink.
Źródło:: Archives of Mechanical Technology and Materials; 2015, 35; 61-69
2450-9469
Pojawia się w:: Archives of Mechanical Technology and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Potential of Manipulating the Damping Properties of Parallel Kinematic Machine Tools
Autorzy:: Wabner, M.
Grzejszczyk, S.
Neugebauer, R.
Powiązania:: https://bibliotekanauki.pl/articles/971111.pdf
Data publikacji:: 2008
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
parallel kinematics
simulation
active damping
Opis:: Parallel kinematics with a higher end-effector degree of freedom such as hexapods and pentapods consist of a large number of joints and slender struts. However, it is only possible to create comparably low levelsof bearing and strut bending stiffness atreasonable expense due to the limited construction space. That means that these structures are very susceptible to vibration. Even in the low-frequency range they have a large number of relevant eigenmodes that are only dampened slightly. Simultaneously, it is difficult to analyze vibrational properties due to coupled eigenmodes, which also makes it difficult to discover ways to remedy this situation. This article will take the example of a pentapod to analyze the dynamic properties of slightly dampened parallel kinematics by simulation to study potential means of manipulating it. This will include a description of the model formation of the mechanical system. The article will also address ways of reducing model size and using various simulation environments to boost analysis efficiency. Finally, both passive and active strategies will be studied and evaluated for boosting damping. Amongst others it could be shown that it is not necessary to damp every of the five kinematic chains to achieve effective improvement of the system damping behaviour.
Źródło:: Journal of Machine Engineering; 2008, 8, 1; 63-76
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Investigation of local and modal based active vibration control strategies on the example of an elastic system
Autorzy:: Peukert, Christoph
Pöhlmann, Patrick
Merx, Marcel
Müller, Jens
Ihlenfeldt, Steffen
Powiązania:: https://bibliotekanauki.pl/articles/99432.pdf
Data publikacji:: 2019
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: modal control
active vibration control
machine tool
inertial actuator
Opis:: Nowadays, feed axes are often equipped with multiple parallel-acting actuators in order to increase the dynamics of the machine tool. Also, additional actuators for active damping are widely used. Normally, the drives or actuators are controlled independently without consideration for the impact on each other. In contrast, by using the modal space control, the system can be decoupled and the modal control loops can be adjusted independently. This control approach is particularly suitable for motion systems, such as machine tools, which have more drives or actuators than degrees of freedom of movement. This paper deals with the pre-investigation of the modal-based vibration control for machine tools with additional actuators. The object of investigation is an elastic system with a movable saddle. The modal-based control is compared with a local control approach. The results obtained experimentally on the test rig are presented. The modal control is superior since, with the modal approach, each control loop corresponds to a specific vibration mode, and the control law for this loop is designed to provide the desired performance of the control system at the corresponding resonance frequency. The parameterisation of the control loops is simplified by modal control, since the modes can be controlled independently.
Źródło:: Journal of Machine Engineering; 2019, 19, 2; 32-45
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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