Marposs Corp The leading-edge technology for gear NVH analysis NVH G-EAR

DESCRIPTION Marposs NVH G-EAR tester, that works on the Single Flank testing principle of one master gear meshing with the component under inspection, is able to detect macro-geometry (nicks, runout etc.) and micro-geometry (gear mesh excitation, ghost orders) defects that are responsible of gear whine and noise phenomena. The ability of achieving high values of torque and rotational speed and the possibility to adjust them at will during testing, is one of the major benefits of the application, which guarantees a great level of correlation with the End Of Line test unit. A robust granite base frame to become non-sensitive to external interferences and disturbances and a highly configurable software make Marposs NVH gear tester at the forefront of technology in the sector, capable of performing accurate Single Flank and NVH analyses. The output parameter is the angular acceleration (rad/s2) evaluated instantaneously and in the long run. The signal of the sensor is broken down into its frequency components. The final elaboration reports the amplitude values of each frequency component = FFT Spectrum. The spectrum normally shows a range of frequencies related to the gear meshing frequencies and relevant sidebands, whose amplitude is usually related to the transmitted load. Unexpected high amplitudes are related to ripples and are defined as ghost orders. BENEFITS CHALLENGING TESTING CONDITIONS The machine has the capability to measure gears at highly demanding testing conditions. As a matter of fact, the system offers the possibility to set the operating conditions in the range 0-2000 rpm (rotational speed) and 0-25 Nm (torque). WIDE OPERATIONAL RANGE The system has the capability to measure gears and shafts with maximum part length 400 mm and maximum diameter 250 mm, offering to our customers the opportunity to accommodate in one single piece of equipment the regular gear production range. ADAPTABILITY TO PROCESS NEEDS Design protect for both manual and automatic (in-line) part loading. QUICK CYCLE TIME A very quick cycle time, in the range of 20-30 seconds, is perfect for in-line 100% check integration. INSENSITIVE TO EXTERNAL VIBRATIONS A granite base frame allows to insulate the machine from environment and other external disturbances. HIGH LEVEL OF ACCURACY Noise data are consistent with End of Line test rigs and analytical laboratory inspection.