Zobrazeno 1 - 10
of 41
pro vyhledávání: '"M. H. Kahrobaiyan"'
Publikováno v:
Journal of Mechanical Design. 142
The most important property for accurate mechanical time bases is isochronism: the independence of period from oscillation amplitude. This paper develops a new concept in isochronism adjustment for flexure-based watch oscillators. Flexure pivot oscil
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bc4eb4c3ff54073431cc8a6f6eb93a6d
https://doi.org/10.1115/1.4045388
https://doi.org/10.1115/1.4045388
Publikováno v:
Volume 5A: 42nd Mechanisms and Robotics Conference.
Flexure pivot based oscillators can advantageously replace the hairspring and balance wheel, the time base used in mechanical watches, by drastically reducing friction. However, flexure pivots have drawbacks including gravity sensitivity and restorin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ad8da5e27cbff8d8ab7e6347de1e694
https://doi.org/10.1115/detc2018-85863
https://doi.org/10.1115/detc2018-85863
Publikováno v:
Journal of Mechanical Design
Journal of Mechanical Design, American Society of Mechanical Engineers, 2018, 140 (7), pp.075002-1-075002-9. ⟨10.1115/1.4039887⟩
Journal of Mechanical Design, 2018, 140 (7), pp.075002-1-075002-9. ⟨10.1115/1.4039887⟩
Journal of Mechanical Design, American Society of Mechanical Engineers, 2018, 140 (7), pp.075002-1-075002-9. ⟨10.1115/1.4039887⟩
Journal of Mechanical Design, 2018, 140 (7), pp.075002-1-075002-9. ⟨10.1115/1.4039887⟩
International audience; Classical mechanical watch plain bearing pivots have frictional losses limiting the quality factor of the hairspring-balance wheel oscillator. Replacement by flexure pivots leads to a drastic reduction in friction and an order
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc6d5839cba27096de1c5ba7f323376e
https://hal.archives-ouvertes.fr/hal-02089613
https://hal.archives-ouvertes.fr/hal-02089613
Publikováno v:
Volume 5A: 41st Mechanisms and Robotics Conference.
Short beams are the key building blocks in many compliant mechanisms. Hence, deriving a simple yet accurate model of their elastokinematics is an important issue. Since the Euler-Bernoulli beam theory fails to accurately model these beams, we use the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f8432815c05a04f5776abb827d3de07
https://doi.org/10.1115/detc2017-67512
https://doi.org/10.1115/detc2017-67512
Autor:
Lennart Rubbert, Ilan Vardi, Roland Bitterli, Nicolas Ferrier, M. H. Kahrobaiyan, Simon Henein, B. Nussbaumer
Publikováno v:
Precision Engineering
Precision Engineering, Elsevier, 2017, ⟨10.1016/j.precisioneng.2017.10.005⟩
Precision Engineering, 2017, ⟨10.1016/j.precisioneng.2017.10.005⟩
Precision Engineering, Elsevier, 2017, ⟨10.1016/j.precisioneng.2017.10.005⟩
Precision Engineering, 2017, ⟨10.1016/j.precisioneng.2017.10.005⟩
In previous work, we showed that two degree of freedom oscillators can be advantageously applied to horological time bases since they can be used to eliminate the escapement mechanism. We subsequently examined planar two degree of freedom oscillators
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c61e4e4c578090e1ec1267b864b4f92
https://hal.archives-ouvertes.fr/hal-03511469
https://hal.archives-ouvertes.fr/hal-03511469
Publikováno v:
Acta Mechanica. 226:505-525
The classical continuum theory not only underestimates the stiffness of microscale structures such as microbeams but is also unable to capture the size dependency, a phenomenon observed in these structures. Hence, the non-classical continuum theories
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41591d2db05f4744ab044b7944c065f8
https://doi.org/10.1007/s00707-014-1188-z
https://doi.org/10.1007/s00707-014-1188-z
Publikováno v:
International Journal of Mechanical Sciences. 79:75-83
Since the classical continuum theory is neither able to evaluate the accurate stiffness nor able to justify the size-dependency of micro-scale structures, the non-classical continuum theories such as the modified couple stress theory have been develo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a263962b656bb6d55b27fe8c99907a60
https://doi.org/10.1016/j.ijmecsci.2013.11.014
https://doi.org/10.1016/j.ijmecsci.2013.11.014
Publikováno v:
Engineering Fracture Mechanics. 116:80-91
The modified couple stress theory is employed in this paper in order to formulate the size-dependent strain energy release rate of Euler–Bernoulli and Timoshenko notched beams. As a case study, the normalized energy release rate of the aforemention
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3bc3e9b65c7de64c25547ac28bed05e6
https://doi.org/10.1016/j.engfracmech.2013.12.001
https://doi.org/10.1016/j.engfracmech.2013.12.001
Publikováno v:
International Journal of Engineering Science. 74:151-161
In this paper, a size-dependent non-classical yield criterion is introduced on the basis of the modified couple stress theory in order to capture the size-dependency of the micro-scale structure yielding loads where the attempts of the classical yiel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::75a3323b4a8b2365facea1bc35b8a7a6
https://doi.org/10.1016/j.ijengsci.2013.09.004
https://doi.org/10.1016/j.ijengsci.2013.09.004
Publikováno v:
Applied Mathematical Modelling. 37:8363-8382
In this paper, the strain gradient theory, a non-classical continuum theory able to capture the size effect happening in micro-scale structures, is employed in order to investigate the size-dependent nonlinear forced vibration of Euler–Bernoulli mi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::76ce3ede1878d7fa02f103e1b21000ca
https://doi.org/10.1016/j.apm.2013.03.046
https://doi.org/10.1016/j.apm.2013.03.046