detection system is employed in sub 40 within sub wall 44 as described hereinabove and shown in fig6 this first vibration detection system is positioned above the bit for the measurement of vibrational forces on the exterior of the drillstring in accordance with a preferred embodiment of this invention a second system is mounted within the pressure housing 28 see fig2 and 6 within the computerized directional service module or cds this pressure housing retains and supports the measurement while drilling microprocessor and electronics and a vibrational system mounted thereon will measure vibrations transmitted to the suspension system which supports the measurement while drilling microprocessor and electronics so as to determine performance of said suspension system as shown in fig6 the three accelerometers a 1 a 2 and a 3 in drill collar segment 40 are disposed in a 60 u00b0 arc 30 u00b0 apart from one another in accordance with the embodiment of fig4 while the three accelerometers a 39 1 a 39 2 and a 3 in the electronic pressure housing 28 are disposed 120 u00b0 apart in accordance with the embodiment of fig3 by having two independent systems one in the sub wall and one in the cds the present invention provides information on the transmissibility of vibratory excitations from the drill collar.