SAP PURCHASE REQUISITION: 4200278284 STATEMENT OF WORK BACKGROUND THE ARMY AFDD AEROMECHANICS DIVISION REGU…

Public award description

SAP PURCHASE REQUISITION: 4200278284 STATEMENT OF WORK BACKGROUND THE ARMY AFDD AEROMECHANICS DIVISION REGULARLY REQUIRES THE USE OF SIGNAL ANALYSIS DEVICES TO BALANCE ROTATING SYSTEMS, TO PERFORM MODAL ANALYSES AND TO MONITOR AND DIAGNOSE VIBRATION ISSUES WHILE RUNNING ROTATING AND/OR OSCILLATING TESTS. THESE TASKS ARE CURRENTLY PERFORMED WITH EQUIPMENT THAT IS OUT OF DATE AND NO LONGER SUPPORTED BY THE MANUFACTURERS FOR UPDATES OR REPAIR. ONE OF THESE SYSTEMS HAS TWO CHANNELS AND IS OSTENSIBLY PORTABLE BUT AT ABOUT FORTY POUNDS, IT IS DIFFICULT TO USE IN MANY SITUATIONS. THE OTHER SYSTEM TAKES A RACK MOUNTED MAINFRAME AND A PC TO OPERATE AND HAS UP TO THIRTEEN CHANNELS BUT IS NOT AT ALL PORTABLE. BOTH OF THESE SYSTEMS ARE MADE AVAILABLE TO THE AEROMECHANICS DIVISION BY THE NASA ROTORCRAFT BRANCH AND MAY NOT ALWAYS BE AVAILABLE AT A GIVEN TIME. NEW SYSTEMS NOW EXIST WHICH CAN REPLACE BOTH OF THESE ITEMS IN A BATTERY POWERED HANDHELD PACKAGE. THE NEW SYSTEM OFFER MORE CAPABILITIES, HIGHER CHANNEL COUNTS AND THE SUPPORT OF THEIR MANUFACTURERS, WHO ARE STILL IN BUSINESS AND PUTTING OUT UPDATES. MODAL TESTING REQUIRES THE USE OF AN INSTRUMENTED DEVICE TO INPUT A FORCING FUNCTION. THE SIMPLEST AND MOST VERSATILE IS AN INSTRUMENTED HAMMER. THE INSTRUMENTED HAMMERS USED BY THE AEROMECHANICS DIVISION ARE BORROWED FROM THE NASA ROTORCRAFT BRANCH AND MAY NOT ALWAYS BE AVAILABLE AT A GIVEN TIME. REQUIREMENTS A REPLACEMENT SIGNAL ANALYZER MUST HAVE TWO BASIC CAPABILITIES, BALANCING AND MODAL ANALYSIS. BOTH FUNCTIONS REQUIRE AT LEAST TWO CHANNELS AND, MODAL ANALYSIS ESPECIALLY, BENEFITS FROM INCREASED CHANNEL COUNT SO THAT MODE SHAPES CAN BE OBTAINED WITH THE APPLICATION OF A SINGLE FORCING FUNCTION. BECAUSE THE NATURE OF TESTING IN THE DIFFERENT WIND TUNNELS, HOVER CHAMBER, LASER LAB AND OTHER LOCATIONS REQUIRES GREAT FLEXIBILITY, PORTABILITY IS OF GREAT BENEFIT. THE REPLACEMENT ANALYZER SHOULD BE A HAND HELD DEVICE AND SHOULD NOT REQUIRE A CONNECTION TO A COMPUTER OR MAINFRAME. THE SYSTEM SHOULD BE CAPABLE OF SAVING RAW INPUT DATA AS WELL AS ANALYSIS RESULTS TO FILES THAT CAN THEN BE TRANSFERRED TO OTHER SYSTEM FOR USE IN ANALYSIS AND DOCUMENTATION. AN INSTRUMENTED HAMMER SHOULD BE COMPATIBLE WITH THE SELECTED ANALYZER AND HAVE A CALIBRATED OUTPUT IN VOLTS PER POUND FORCE. THE INSTRUMENT SHOULD EMPLOY INTERNAL ACCELERATION COMPENSATION. SOFTWARE FOR SIGNAL ANALYSIS AND DISPLAY SHOULD BE INCLUDED WITH THE ANALYZER PURCHASE AND INCLUDE FFT SPECTRAL ANALYSIS, TRIGGER, WATERFALL, OCTAVE ANALYSIS, SPECTROGRAM DISPLAY AND GENERAL SIGNAL ANALYSIS FUNCTION AS WELL AS CALIBRATION CAPABILITIES.