Results 31 to 40 of about 8,385,794 (295)
Advances in Mechanical Engineering, 2018 Stick-slip vibration is a big problem that the drilling of deep wells has to face, especially for drilling of tough formations. This type of vibration leads to failure problems, reduces the rate of penetration, and lowers the borehole quality ...
Liping Tang, Xiaohua Zhu
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Dynamic Behavior of Shafts, Couplings and Working Body of the Machine under Torsional Impact Moment [PDF]
Journal of Applied and Computational MechanicsIn this study, the influence of the torsional rigidity of the connected shafts, couplings and the working body of the machine, as well as the damping capacity of the coupling, on the torsional impact moment generated in the machine transmission is ...
Isa Khalilov, Abdullah H. Sofiyev
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Energy Reports, 2021 In the present study, a 3D FEM of compound percussive system considering a loading–unloading cycle was employed to simulate the dynamic single-cutter-rock interaction.
Yumei Li +4 more
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Impact of Aggregated PV on Subsynchronous Torsional Interaction [PDF]
2020 47th IEEE Photovoltaic Specialists Conference (PVSC), 2020 This paper investigates induced oscillation (specifically subsynchronous torsional interactions) in power systems arising from photovoltaic (PV) power modulation. Time domain simulations of a modified IEEE first-benchmark system are presented and analyzed.
Rasel Mahmud, Andy Hoke, Jonathan White
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Flexural–torsional behavior of thin-walled composite space frames [PDF]
, 2009 A general analytical model based on the first-order shear deformable beam theory applicable to thin-walled composite space frames with arbitrary lay-ups under external loads is presented.
Lee, Jaehong, Vo, Thuc
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Development and Field Test of the Same-Frequency Different-Phase Compound Impact Tool
Shiyou jixie, 2023 A same-frequency different-phase compound impact tool was developed to improve the rock-breaking efficiency of PDC bits in hard formations, increase the penetration depth of cutters, and eliminate the “stick-slip” phenomenon of the downhole bit.The ...
Ye Daohui +5 more
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Long-wavelength torsional modes of solar coronal plasma structures [PDF]
, 2010 Aims. We consider the effects of the magnetic twist and plasma rotation on the propagation of torsional m = 0 perturbations of cylindrical plasma structures (straight magnetic flux tubes) in the case when the wavelength is much longer than the cylinder ...
V. M. Nakariakov +8 more
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On the scattering of torsional elastic waves from axisymmetric defects in coated pipes [PDF]
, 2012 This is the post-print version of the Article - Copyright @ 2012 ElsevierLong range ultrasonic testing is now a well established method for examining in-service degradation in pipelines.
Mudge, P, Zlatev, Z, Kirby, R
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Applied Sciences, 2022 The precision rotary vector reducer with involute variable tooth thickness (PRVT) is a high-performance precision transmission device, which is very suitable for aerospace, medical machinery, industrial robots, automation equipment, and other fields, and
Le Chang +5 more
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Torsional ultrasound mode versus combined torsional and conventional ultrasound mode phacoemulsification for eyes with hard cataract [PDF]
, 2011 Mohamed A Fakhry1,2, Malak I El Shazly11Department of Ophthalmology, Kasr El Aini Hospital, Cairo University, Cairo, Egypt; 2Cataract and Refractive Consultant, International Eye Hospital, Cairo, EgyptPurpose: To compare torsional versus combined ...
El Shazly MI, Mohamed Fakhry, Fakhry MA
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