scholarly journals Application of a Thermo-Hydrodynamic Model of a Viscous Torsional Vibration Damper to Determining Its Operating Temperature in a Steady State

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5234
Author(s):  
Wojciech Homik ◽  
Aleksander Mazurkow ◽  
Paweł Woś
Keyword(s):  
Torsional Vibration ◽  
Hydrodynamic Model ◽  
Operating Temperature ◽  
Operational Reliability ◽  
Point Of View ◽  
Model Verification ◽  
Torsional Vibrations ◽  
Vibration Damper ◽  
Drive Unit ◽  
Angular Velocities

The problem of damping torsional vibrations of the crankshaft of a multi-cylinder engine is very important from the point of view of the durability and operational reliability of the drive unit. Over the years, attempts have been made to eliminate these vibrations and the phenomena accompanying them using various methods. One of the methods that effectively increases the durability and reliability of the drive unit is the use of a torsional vibration damper. The torsional vibration damper is designed and selected individually for a given drive system. A well-selected damper reduces the amplitude of the torsional vibrations of the shaft in the entire operating speed range of the engine. This paper proposes a thermo-hydrodynamic model of a viscous torsional vibration damper that enables the determination of the correct operating temperature range of the damper. The input parameters for the model, in particular the angular velocities of the damper elements as well as the geometric and mass dimensions of the damper were determined on a test stand equipped with a six-cylinder diesel engine equipped with a factory torsional vibration damper. The damper surface operating temperatures used in model verification were measured with a laser pyrometer. The presented comparative analysis of the results obtained numerically (theoretically) and the results obtained experimentally allow us to conclude that the proposed damper model gives an appropriate approximation to reality and can be used in the process of selecting a damper for the drive unit.

Temperature as a Source of Information about the Technical Condition Viscous Torsion Damper

2015 ◽  
Vol 236 ◽  
pp. 78-84
Author(s):  
Wojciech Homik ◽  
Tadeusz Markowski
Keyword(s):  
Torsional Vibration ◽  
Technical Condition ◽  
Point Of View ◽  
Technical State ◽  
Torsional Vibrations ◽  
Vibration Damper ◽  
Drive Unit ◽  
Acceptance Criterion ◽  
Source Of Information

The problem of damping of torsional vibrations of the crankshaft in a multi-cylinder engine is very important from the point of view of durability and reliability of the drive unit of the vessel or ship. Mostly dependent on the technical state of the torsional vibration damper that is located at the free end of the crankshaft. The paper presents selected results of the research that led to the acceptance criterion for assessing the technical condition of the viscous torsion damper.

Application of Four-Pole Parameters to Torsional Vibration Problems

1962 ◽  
Vol 84 (1) ◽  
pp. 21-34 ◽  
Author(s):  
C. T. Molloy
Keyword(s):  
Equivalent Circuit ◽  
Torsional Vibration ◽  
Natural Frequencies ◽  
Distributed Parameter Systems ◽  
Distributed Parameter ◽  
Torsional Vibrations ◽  
Electrical Circuits ◽  
Angular Velocities ◽  
Vibration Problems ◽  
Pole System

This paper deals with the application of the method of four-pole parameters to torsional vibrations. Results are developed from fundamental principles. The four-pole parameters for the basic rotational elements are derived. These include shafts (both lumped and distributed-parameter cases), disks, dampers, and gears. The equations which must be obeyed, when these elements are connected, are presented. The application to construction of equivalent electrical circuits is given and in particular a method for constructing the equivalent circuit of distributed-parameter systems is put forth. The torsional analogs of Thevenin’s and Norton’s theorems are given for rotational sources. The fundamentals mentioned above are then applied to the following problems: (a) The effect of substituting one four-pole for another in a torsional system. (b) The effect of opening a four-pole system and inserting a new four-pole between the separated four-poles. (c) Calculation of all the torques and angular velocities in a tandem system. (d) Calculation of natural frequencies of undamped four-pole systems.

Development of a model predictive controller for an active torsional vibration damper to suppress torsional vibrations in vehicle powertrains

2021 ◽  
pp. 095440702110147
Author(s):  
Alişan Yüceşan ◽  
Ata Mugan
Keyword(s):  
Torsional Vibration ◽  
Internal Combustion Engines ◽  
Vibration Isolation ◽  
Fuzzy Logic Controller ◽  
Prediction Models ◽  
Exhaust Emission ◽  
Torsional Vibrations ◽  
Vibration Damper ◽  
Model Predictive Controller ◽  
Predictive Controller

The pressure of exhaust emission regulations on automotive manufacturers to reduce environmental pollution and fuel consumption of internal combustion engines (ICEs) have stimulated the works on the downsizing, downspeeding, and turbo supercharging concepts which result in boosted engine torsional vibrations. Despite significant momentum in the implementation of those concepts in modern ICEs in recent decades, similar progress has not taken place in parallel at torsional vibration isolation systems. To this end, this article centers on the development and implementation of a model predictive controller (MPC) on a novel active torsional vibration damper (ATVD) in which inertia, stiffness rate, and damping rate parameters can be varied to minimize torsional vibration transmission to the vehicle powertrain. Dynamic response of the ATVD is examined using an MPC inside a closed-loop control architecture with predicted variables. The MPC structure, state-space plant model, and physical constraint definitions are composed to be utilized in prediction models at various engine operating points. The MPC performance is evaluated in a co-simulation environment using Simcenter Amesim, NX Motion, and Matlab Simulink software, and are compared with that of the fuzzy logic controller (FLC). The simulation results clearly indicate that the MPC applied to the ATVD system has certain advantages over the FLC and is able to provide satisfactory isolation of the powertrain from engine-borne torsional vibrations while satisfying the physical constraints.

Transient and Unstable Torsional Vibrations on a 4-Stroke Marine Diesel Engine

2003 ◽  
Author(s):  
D. C. Lee ◽  
J. D. Yu
Keyword(s):  
Diesel Engine ◽  
Torsional Vibration ◽  
Marine Diesel Engine ◽  
Torsional Vibrations ◽  
Steady State Condition ◽  
Marine Propulsion ◽  
Friction Clutch ◽  
Marine Diesel ◽  
Noise Measurements ◽  
Unstable Vibration

Under steady state condition, unstable torsional vibration normally does not occur in shafting systems using 4stroke diesel engine due to hysteresis damping of shafting system and relative damping of standard fitted damper. However, the unstable torsional vibration occurs on marine propulsion shafting systems due to slippage of a multi-friction clutch installed between increasing gear box and shaft generator. To identify this unstable vibration and make proper counter measure, the simulation for transient torsional vibration using the Newmark method is introduced in this paper. The mechanism of this unstable vibration is verified by vibration and noise measurements of the shafting system.

Effect of Axial and Torsional Vibrations on Tapping Performance

2016 ◽  
Vol 826 ◽  
pp. 88-92
Author(s):  
Swapnil Pawar ◽  
Sandip Patil ◽  
Pravin Pawar ◽  
Rajkumar Singh
Keyword(s):  
Titanium Alloys ◽  
Torsional Vibration ◽  
Torsional Vibrations ◽  
Taguchi Approach ◽  
Maximum Torque ◽  
Degree Of Reduction

Abrupt breakage of the taps is frequently encountered during tapping threads, especially when tapping on ‘difficult-to-cut’ material like titanium. This work therefore presents an extensive experimentation with the Taguchi approach to investigate maximum torque in tapping on titanium alloys while performing axial and, axial and torsional vibration-assisted tapping (AVAT and ATVAT). The experimentation shows that both AVAT and ATVAT reduce the tapping torqueduring tapping as compared to that of in conventional tapping process. However, ATVAT process had exhibited a higher degree of reduction in torque when compared to AVAT process.

scholarly journals An unconventional rubber torsional vibration damper with two degrees of freedom

2017 ◽  
Vol 13 ◽  
pp. 136-141
Author(s):  
Václav Píštěk ◽  
Pavel Kučera ◽  
Olena Nozhenko ◽  
Kostiantyn Kravchenko ◽  
David Svída
Keyword(s):  
Torsional Vibration ◽  
Degrees Of Freedom ◽  
Vibration Damper ◽  
Two Degrees Of Freedom
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