Torsional vibration
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Coupled transverse and torsional vibrations in a mechanical system with two identical beams Open
The paper aims to study a plane system with bars, with certain symmetries. Such problems can be encountered frequently in industry and civil engineering. Considerations related to the economy of the design process, constructive simplicity,…
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Analysis and Control of Stick-Slip Oscillations in Drilling Systems Open
This paper proposes feedback control strategies for the mitigation of torsional stick-slip oscillations in drilling systems using drag bits. Herein, we employ a model for the coupled axial-torsional drill-string dynamics in combination wit…
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Influence of longitudinal-torsional ultrasonic-assisted vibration on micro-hole drilling Ti-6Al-4V Open
As Ti-6Al-4V is a typical hard to machine material, especially in micro drilling aviation parts, chip breaking difficulty is of increasing interest to explore its further development. In this study, Longitudinal-Torsional Ultrasonic Assist…
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Time-Frequency Analysis of Torsional Vibration Signals in Resonance Region for Planetary Gearbox Fault Diagnosis Under Variable Speed Conditions Open
Translational vibration-based methods have been widely used for machinery fault diagnosis. However, because of the unique gear configuration and complex kinetics, planetary gearbox translational vibration signals have complex modulation fe…
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On the effect of multiple parallel nonlinear absorbers in palliation of torsional response of automotive drivetrain Open
Torsional vibrations transmitted from the engine to the drivetrain system induce a plethora of noise, vibration and harshness (NVH) concerns, such a transmission gear rattle and clutch in-cycle vibration, to name but a few. The main elemen…
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Mitigation of Torsional Vibrations in Drilling Systems: A Robust Control Approach Open
Stick-slip vibrations decrease the performance, reliability, and fail safety of drilling systems. The aim of this paper is to design a robust output-feedback control approach to eliminate torsional stick-slip vibrations in drilling systems…
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Proposal for quantum many-body simulation and torsional matter-wave interferometry with a levitated nanodiamond Open
Hybrid spin-mechanical systems have great potentials in sensing, macroscopic\nquantum mechanics, and quantum information science. In order to induce strong\ncoupling between an electron spin and the center-of-mass motion of a mechanical\no…
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Active control of stick-slip torsional vibrations in drill-strings Open
This paper presents active vibration control to reduce the stick-slip oscillations in drill-strings. A simplified two degrees-of-freedom drill-string torsional model is considered. The nonlinear interaction between the rock and the bit is …
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Axial and Torsional Free Vibrations of Elastic Nano-Beams by Stress-Driven Two-Phase Elasticity Open
Size-dependent longitudinal and torsional vibrations of nano-beams are examined by two-phase mixture integral elasticity. A new and efficient elastodynamic model is conceived by convexly combining the local phase with strain- and stress-dr…
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Stochastic modeling for hysteretic bit–rock interaction of a drill string under torsional vibrations Open
This paper aims at constructing a stochastic model for the hysteretic behavior of the nonlinear bit–rock interaction of a drill string under torsional vibrations. The proposed model takes into account the fluctuations of the stick–slip osc…
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Investigation on nonlinear lateral-torsional coupled vibration of a rotor system with substantial unbalance Open
Substantial unbalance may be caused by fan blade off during the operation period of gas turbine engines, and related dynamic problems are very critical to the safety design of rotor system in aero-engine. This article aims to understand la…
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Torsional vibrations in heavy-truck powertrains with flywheel attached centrifugal pendulum vibration absorbers Open
A nonlinear centrifugal pendulum vibration absorber (CPVA) with normal-force dependant friction loss is investigated in a torsional model of a downspeeded powertrain of a heavy-truck. The engine model includes gas-pressure excitation and t…
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Nonlinear output‐feedback control of torsional vibrations in drilling systems Open
Summary This paper considers the design of a nonlinear observer‐based output‐feedback controller for oil‐field drill‐string systems aiming to eliminate (torsional) stick–slip oscillations. Such vibrations decrease the performance and relia…
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Experimental investigations on longitudinal-torsional vibration-assisted milling of Ti-6Al-4V Open
In vibration-assisted milling (VAM), an additional high-frequency oscillation is superimposed on the kinematics of a conventional machining process. This generates oscillations of the cutting edge in the range of a few micrometers, thereby…
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Torsional vibration of a circular cylinder with an attached splitter plate in laminar flow Open
Splitter plates have been recognized as useful passive devices to reduce drag, mitigate flow-induced vibration, and enhance heat transfer efficiency of a circular cylinder. However, undesired torsional flow-induced vibrations due to splitt…
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Torsional stick-slip vibrations and multistability in drill-strings Open
This is the final version. Available on open access from Elsevier via the DOI in this record
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Optimization design of powertrain mounting system considering vibration analysis of multi-excitation Open
The stiffness of mounting system determines the vibration isolation ability of the transmitted path, which is the key factor that affects the vibration and noise of vehicle. In order to improve the vibration isolation ability of the powert…
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Coupled dynamic behaviour of a transmission system with gear eccentricities for a high-speed train Open
The transmission system of a motor car directly affects the operating reliability and running safety of a high-speed train. This study examines the coupled torsion vibration responses of a transmission system in a vehicle–track vibration e…
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Mathematical modelling of torsional vibrations of the three-layer cylindrical viscoelastic shell Open
The paper considers a circular cylindrical three-layer shell of arbitrary thickness from a viscoelastic material. It is believed that it consists of two outermost bearing layers and a middle layer between them, the materials of which are g…
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CONTINUOUS TUNING OF SHIP PROPULSION SYSTEM BY MEANS OF PNEUMATIC TUNER OF TORSIONAL OSCILLATION Open
Mechanical system drives consist of driving machines and gearing mechanisms interconnected by shafts and couplings. In terms of dynamics it is possible to say that every driving mechanism is able to oscillate. Especially piston devices can…
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Vibration Suppression of a Flexible-Joint Robot Based on Parameter Identification and Fuzzy PID Control Open
In order to eliminate the influence of the joint torsional vibration on the system operation accuracy, the parameter identification and the elastic torsional vibration control of a flexible-joint robot are studied. Firstly, the flexible-jo…
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Driveline Torsional Analysis and Clutch Damper Optimization for Reducing Gear Rattle Open
This paper describes a research work on driveline modeling, torsional vibration analysis, and clutch damper parameters optimization for reducing transmission gear rattle on the vehicle creeping condition. Firstly, major driveline component…
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Stick-Slip Vibration Suppression in Drill String Using Observer-Based LQG Controller Open
Hydrocarbon exploration and production activities are guaranteed through various operations including the drilling process, which is realized by using rotary drilling systems. The process involves crushing the rock by rotating the drill bi…
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Developments in the Design of Centrifugal Pendulum Vibration Absorbers Open
For over 60 years, the torsional vibration of reciprocating aircraft engines has been controlled by centrifugal pendulum vibration absorbers. Loose weights attached to an engine's crankshaft act as tuned-mass absorbers by oscillating at a …
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Numerical simulation of rock-breaking and influence laws of dynamic load parameters during axial-torsional coupled impact drilling with a single PDC cutter Open
Axial and torsional impact drilling technology is used to improve the drilling efficiency of hard rock formation in the deep underground. Still, the corresponding theory is not mature, and there are few correlative research reports on the …
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An analytical method for free vibration of multi cracked and stepped nonlocal nanobeams based on wave approach Open
Various discontinuities and boundary conditions affect natural frequencies of nanobeams. In this paper, free lateral vibration of Euler-Bernoulli nanobeam with multiple discontinuities is studied. The governing equations are developed by u…
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Additional Losses of Electrical Machines Under Torsional Vibration Open
| openaire: EC/FP7/339380/EU//ALEM
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TORSIONAL NATURAL FREQUENCY TUNING BY MEANS OF PNEUMATIC FLEXIBLE SHAFT COUPLINGS Open
This article deals with the use of pneumatic flexible shaft couplings as device for tuning torsional natural frequencies of mechanical systems. These couplings are using air bellows as flexible elements. Their torsional stiffness can be ch…
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The Effect of Torsional Vibration in Longitudinal–Torsional Coupled Ultrasonic Vibration-Assisted Grinding of Silicon Carbide Ceramics Open
Rotary longitudinal–torsional coupled ultrasonic vibration-assisted grinding (LTUAG) is a new manufacturing method that can improve the grinding ability of silicon carbide ceramics. However, compared with longitudinal ultrasonic vibration-…
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Research and development of resonant electromagnetic vibration screen for intensive vibration technologies Open
In the article the development and use of controlled electromagnetic vibration drives used in the field of intensive vibration technologies are considered. Method is proposed for adjustment of amplitude and frequency of vibration of workin…