Damped propshaft assembly and method for fabricating a damped propshaft assembly

A method for manufacturing a shaft assembly for a driveline system, the driveline system including a first driveline component and a second driveline component, the shaft assembly being adapted to transmit torque between the first driveline component and the second driveline component, the method comprising:

• providing a hollow shaft;
• providing a tuned damper, the tuned damper comprising an intermediate damper and a damping member, the intermediate damper comprising at least one liner whose mass and/or a stiffness is tuned to attenuate one or more of a bending moment vibration and a torsion mode vibration that occurs at a first predetermined frequency, the at least one liner not being configured to substantially damp shell mode vibration that occurs at a frequency that is not equal to the first predetermined frequency, the damping member being coupled to the intermediate damper to form the tuned damper, the damping member being configured to primarily attenuate shell mode vibration at one or more desired frequencies, the tuned damper attenuating the at least one of the bending moment vibration and the torsion mode vibration at the first predetermined frequency and also attenuating shell mode vibration;
• and
• installing the tuned damper into the hollow shaft.

A method for manufacturing a shaft assembly for a driveline system, the driveline system including a first driveline component and a second driveline component, the shaft assembly being adapted to transmit torque between the first driveline component and the second driveline component, the method comprising:

• providing a hollow shaft;
• providing a tuned damper comprising at least one liner and a damping member, the at least one liner forming a tuned reactive absorber for attenuating at least one of bending mode vibrations and torsion mode vibrations at a first predetermined frequency, the tuned reactive absorber not being configured to substantially damp shell mode vibration that occurs at a frequency that is not equal to the first predetermined frequency, the damping member being coupled to the at least one liner to form the tuned damper, the tuned damper being the tuned reactive absorber that is configured to attenuate the at least one of the bending mode vibrations and the torsion mode vibrations, the tuned damper also being a multi-mode, multi-frequency resistive absorber that is configured to attenuate shell mode vibrations;
• and
• inserting the tuned damper into the shaft member.