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Technical Paper

Self-Tuning Torsional Vibration Dampers for V8 Engines

2017-06-05
2017-01-1819
The problem of crankshaft torsional vibrations for heavy car engines is important for the V8 engines. The paper describes the results of the dynamical study of the new patented Torsional Vibration Dampers mounted on a crankshaft in V8 engines. Design and structure of Torsional Vibration Damper is based on author’s US Patent 7,438,165 having the control system with instantaneous frequencies tuner for all frequencies of running engine. Analysis and disadvantages of conventional rubber and viscous Crank Dampers are shown. The focus of the study is on Torsional Vibration Damper having the mechanical self-tuning structure applicable for V8 engines. Mathematical model based on the system of ordinary differential equations describing the rotation and vibration of mechanical components has been used for the analysis of the dynamic behavior of V8 engine crankshaft system having proposed Torsional Vibration Damper.
Technical Paper

Engine Noise Reduction Using Self-Tuning Torsional Vibration Damper

2016-04-05
2016-01-1063
Up to 30% of engine noise is delivered by front end pulley combined with torsional vibration damper, and technically it is the main contributor to recorded engine noise level. So the novel solutions in terms of improving the design and performance of torsional vibration damper would help to reduce radically this component of engine noise. The results of dynamical study of patented torsional vibration damper combined with pulley are presented. Design and structure of torsional vibration damper is based on author’s US Patent 7,438,165 having the self-tuning control system for all frequencies in running engine in all operational regimes. Mathematical model has been used for the analysis of the emitting noise of engine having proposed torsional vibration damper. Attention is paid to mitigation of the sound power levels contributing by engine subsystem “end of crankshaft - torsional vibration damper - pulley”.
Technical Paper

Flywheel with tuned damping

2014-04-01
2014-01-1685
The study of dynamical performance of new Flywheel for any type of engine is presented. Design and structure of proposed Flywheel is based on George Nerubenko US Patent 7,464,800 having the control system with instantaneous frequency tuner and variable damping device adjusted for all operational frequencies in running engine. The patented scheme would be applied for a design of Flywheels successfully replacing the conventional and dual mass flywheels. A description, structural details and mathematical model of considered Flywheel are presented. The model based on the system of differential equations describing the rotation and vibration of mechanical components combined to Coulomb dry friction equations reflecting the contacts in variable damping device has been used for the analysis of the dynamic behavior of engine crankshaft system having proposed Flywheel. The analysis is presented for semi-controlled version of Tuned Flywheel equipped with variable damping device.
Technical Paper

Torsional Vibration Damper with Micro-channel Tuners

2014-04-01
2014-01-1691
The results of dynamical study of new patented Torsional Vibration Damper for an engine crankshaft are presented. Design and structure of Torsional Vibration Damper is based on author's US Patent 7,438,165 having the control system with instantaneous frequencies tuner for all frequencies in running engine. Basically the tuner should be designed in three optional manners: having mechanical structure, electromechanical structure with control system and micro-channels filled by electrolyte solution. The focus of the study is on Torsional Vibration Damper equipped with micro-channels filled by electrolyte solution.
Technical Paper

Tuned Torsional Vibration Damper

2013-05-13
2013-01-1897
The study of dynamic performance of new patented Torsional Vibration Damper for an engine crankshaft is presented. Design and structure of Torsional Vibration Damper is based on author's US Patent 7,438,165 having the control system with instantaneous frequencies tuner which allows implementing exact tuning strategy for all frequencies in running engine. The same scheme would apply for a design of perfectly tuned Flywheels which could successfully replace the conventional and dual mass flywheels. A description and structural details of proposed solution are shown. Mathematical model based on the system of second order differential equations and experimentation techniques have been used for establishing of the dynamic behavior of engine crankshaft system. Main attention is paid to mitigation of the torsional vibrations; some suggestions are made for elimination of the variations of instantaneous value of rotational speed and coefficient of fluctuation of rotational speed.
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