This paper studies the excitation of torsional vibrations by electromechanical interaction after connection electrical loads. Electrical generation and power system in aircraft are becoming key importance, especially considering current roadmap for aerospace systems' electrification. However, since drivetrain which links generators to main engine is relatively flexible most structures, can be e...

Aircraft drivetrains connect the engine to electrical power system. In most cases, are relatively flexible and have vibration modes with values below 100 Hz reduce weight size. Therefore, loads’ connection disconnection may excite torsional vibrations in machine's shaft, reducing drivetrains’ lifespan. This interaction is known as electromechanical interaction. issue can be mitigated using an i...

Purpose. To formalize the dependence of eigenfrequencies translational and torsional vibrations structural elements vibrating machine articulated by connection node on their design parameters mechanical characteristics, as well regulatory requirements for vibration activity, strength accuracy. develop a method selecting elastic band element package, taking into account specified values amplitud...

Torsional vibrations are inherently present in every rotating powertrain. In resonant conditions, torsional can be significantly amplified. A typical method to reduce the vibration particularly at resonance is modify natural frequencies with component design. Commonly, a straightforward for modification adjustment of stiffness coupling. This study presents using coupling design continuously adj...

Abstract. Centrifugal pendulum absorbers are passive dampers mainly employed nowadays to attenuate torsional vibrations in modern drivetrains reduce fuel consumption and CO2 emissions. The absorber is linked the drivetrain by means of a higher kinematic joint composed slots rollers, termed caged-roller joint. This work aims investigate contact between rollers through multibody dynamics simulati...

Suspension bridges’ in-plane extended configuration makes them vulnerable to wind-induced vibrations. Vortex shedding is a kind of aerodynamic phenomenon causing bridge vibrate in vertical and torsional modes. Vortex-induced vibrations disturb the bridge’s serviceability limit, which not favorable, long run, they can cause fatigue damage. In this condition, vibration control strategies seem be ...

Very few reports have been presented to date on the noise and vibrational characteristics of oil injected screw compressors. This time. a series of extensive experimental analysis is performed. It includes the measurements and analysis of compressor casing vibrations. rotor shafts vibrations, torsional <rotational) vibrations. suction and discharge gas pulsations. pressure trans~ ient in one th...

We postulate that an equivalent continuum structure (ECS) of a single-walled carbon nanotube (SWCNT) is a hollow cylinder with mean radius and length equal to that of the SWCNT, and find the thickness of the ECS so that its mechanical response in free vibrations is the same as that of the SWCNT. That is, for mechanical deformations, the ECS is energetically equivalent to the SWCNT. We use MM3 p...