Results 31 to 40 of about 1,261 (138)
Universal response of optimal granular damping devices [PDF]
, 2012 Granular damping devices constitute an emerging technology for the attenuation of vibrations based on the dissipative nature of particle collisions. We show that the performance of such devices is independent of the material properties of the particles ...
Bai +26 more
core +2 more sources
Analysis of Nonlinear Vibration of Hard Coating Thin Plate by Finite Element Iteration Method
Shock and Vibration, Volume 2014, Issue 1, 2014., 2014 This paper studies nonlinear vibration mechanism of hard coating thin plate based on macroscopic vibration theory and proposes finite element iteration method (FEIM) to theoretically calculate its nature frequency and vibration response. First of all, strain dependent mechanical property of hard coating is briefly introduced and polynomial method is ...
Hui Li +3 more
wiley +1 more source
Impact Force Magnitude Analysis of an Impact Pendulum Suspended in a Vibrating Structure
Shock and Vibration, Volume 19, Issue 6, Page 1359-1372, 2012., 2012 The purpose of this work is the experimental investigation and the mathematical modeling of the impact force behavior in a vibro‐impact system, where an impact pendulum is mounted on a cart that moves with a prescribed displacement. The dynamics of the system will be evaluated considering different excitation frequencies and changing the impact gap ...
R.R. Aguiar, H.I. Weber
wiley +1 more source
Laboratory-Scale Drillstring Vibration Analysis
MiningDrillstring vibrations are detrimental to drill bits and downhole equipment, affecting drilling efficiency and operational cost in severe drillstring vibration cases.
Eshan K. Maitra +1 more
doaj +1 more source
Reconstructed drill-bit motion for sonic drillstring dynamics
European Journal of Control, 2019 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Ammari, Kaïs, Beji, Lotfi
openaire +4 more sources
, 2009 In the oil and gas industry, an underreamer is a tool used to extend and enlarge the diameter of a previously-drilled bore. The problem proposed to the Study Group is to obtain appropriate mathematical models of underreamer dynamics, in forms that will ...
Barton, David +8 more
core
Ultrasonic Planetary Core Drill: Overview and Results from Field Trial [PDF]
, 2017 In the effort to explore the subsurface of terrestrial bodies, we seek to obtain better samples from ever greater depths. Many organisations are working towards technologies that can achieve this goal whilst ensuring compatibility with the likely ...
Harkness, Patrick +4 more
core
Effect of particle shape and fragmentation on the response of particle dampers [PDF]
, 2013 A particle damper (PD) is a device that can attenuate mechanical vibrations thanks to the dissipative collisions between grains contained in a cavity attached to the vibrating structure.
Carlevaro, Carlos Manuel +2 more
core +1 more source
Analysis of the nonlinear dynamics of a horizontal drillstring
, 2014 This work aims to analyze the nonlinear dynamics of a drillstring in horizontal configuration. A computational model, which uses a nonlinear beam theory with rotatory inertia and shear deformation of the beam cross section, as well as the coupling between longitudinal, transverse, and torsional vibrations is proposed. This model also takes into account
Cunha Jr, A. +2 more
openaire +2 more sources
A parametric study for the design of an optimized ultrasonic-percussive planetary drill tool [PDF]
, 2016 Traditional rotary drilling for planetary rock sampling, in situ analysis, and sample return are challenging because the axial force and holding torque requirements are not necessarily compatible with lightweight spacecraft architectures in low-gravity ...
Harkness, Patrick +4 more
core +1 more source