High frequency torsional oscillation
WebLater, the tool was tested in the field in a BHA configured to log the vibration below and above the tool at sufficiently high sample rates to validate the isolation effect of the tool. … WebTorsional vibrations can be excited in the shaft trains of large steam turbine gen-erators by electrical disturbance torques occurring in the active part of the generator with 1 and 2 times the grid frequency. The torque amplitudes can be high, eg during short-time faults, or remain low over long operating periods. Natural torsional frequencies ...
High frequency torsional oscillation
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WebEspecially in hard and dense formations, high-frequency torsional oscillations are found in the bottom-hole assembly (BHA). [1] This paper reports the development of and the results of high frequency torsional oscillation (HFTO) tests performed on full-sized PDC drill bits and single cutters in a drilling laboratory. [2] WebHigh-frequency oscillations (HFOs) are fast local oscillatory field potentials of frequency > 80 Hz, commonly subdivided into ripples (80–250 Hz) and fast ripples (> 250 Hz).HFOs …
Web27 de set. de 2016 · The oscillation frequency is a function of the drillstring length and stiffness, and is typically less than 0.5 Hz for all drillstrings ( SPE 21945 ). LFTO is characterized by a maximum revolutions per minute (RPM) of up to twice the average drillstring RPM and a bit that may stop, but only instantaneously. Web1 de ago. de 2024 · This paper first analyzes several typical multi-frequency oscillation events caused by large-scale wind power integration in domestic and foreign projects, then studies the multi-frequency oscillation problems, including wind turbine's shafting torsional oscillation, sub/super-synchronous oscillation and high frequency resonance.
Web摘要： This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 193313, "Simulation and Testing of an Isolator Tool for High-Frequency … Webhigh-frequency torsional oscillation SPE Disciplines. Highlight matches. Any in SPE Disciplines (7) Conference. Offshore Technology Conference (1) SPE Annual Technical Conference and Exhibition (1) SPE Middle East Oil & Gas Show and Conference (1) SPE/IADC International Drilling Conference and Exhibition (3)
Web7 de mar. de 2006 · First, it is to be shown that high-frequency torsional oscillations, generated by the motor drive, are transmitted through the motor shaft. Second, a torsional vibration model is developed that will better approximate high-frequency torsional response. The torsional vibration of induction machines has received considerable …
WebHowever, increasing the amplitude also increases the restoring force. The increase in force proportionally increases the acceleration of the mass, so the mass moves through a greater distance in the same amount of time. Thus, increasing the amplitude has no net effect on the period of the oscillation. fly to italy from uk covidWeb7 de mar. de 2006 · High-frequency torsional oscillations of a 50 horsepower (hp) induction motor are investigated up to approximately 30 kHz. It is experimentally … fly to istanbul from dublinWeb4 de mar. de 2024 · High frequency torsional oscillation (HFTO) has gained considerable attention over the past several years due, in large part, to the continued use of motor … greenport congress and cruiseWeb1 de jul. de 1993 · A sinusoidal high frequency signal with a frequency equal to the system resonance frequency o)o is generated in a voltage controlled oscillator (VCO) and serves as the input for the power amplifier. The maximum power output of the conventional high frequency amplifier is about 300 W. fly to jamaica from torontoWebAbstract Bit and bottom hole assembly (BHA) rotational speed oscillation is often encountered in North America land drilling applications. One common type of rotational speed oscillation is the well-known stick-slip, with speed variation at a frequency that is close or lower than the fundamental torsional natural frequency of the drillstring … fly to jamaicaWeb5 de nov. de 2024 · Energy in the simple harmonic oscillator is shared between elastic potential energy and kinetic energy, with the total being constant: (15.S.30) E T o t a l = … fly to japan from brisbaneWebn is the natural torsional frequency of the system. k t is the torsional stiffness of the shaft, and ζ t is the torsional damping ratio. An amplified frequency in the drivetrain torsional response can be due to a significant excitation amplitude or coincidence of excitation frequency with natural frequencies. fly to ivory coast