Stinger mass compensation problems occur when the force transducer is mounted on the stinger's exciter end. These problems are investigated theoretically and numerically. It is found that the measured frequency response function (FRF) can be underestimated if mass compensation is based on the stinger exciter-end acceleration and can be overestimated if the mass compensation is based on the structure-end acceleration due to the stinger's compliance. A new mass compensation method that is based on two accelerations is introduced and is seen to improve the accuracy considerably.

by ASL