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Table Instruments NI USB Dynamic Signal Acquisition Module, Model NI-USB 9234 Single axial accelerometer with ceramic shear ICPⓇ accel. Data analyzer Description Number of channels: 4 ADC resolution: 24 bits Max Sampling Rate: 52kHz Sensitivity: 100 mV/g Equip with DASYLab Software
a) In Fast Fourier Transform analysis, explain the role of windowing function, and justify the criteria in selection of the type of window. b) A microphone with sensitivity of 30 mV/Pa is used to measure the sound pressure. If the output of the measurement is measure in the unit of voltage, construct the mathematical relationship to measure the sound intensity in Decibel (dB) unit. Consider the pressure reference, Pref= 1 x 10³ Pa. c) As a vibration analyst, you were assigned to perform vibration measurement on a pipeline system for turbo machinery equipment. Early measurement shows the significant frequencies for this system is less than 2 kHz. With the equipment listed in Table design a measurement layout using DASYLab software to fulfill the following outcomes: The display of time waveform for displacement, velocity and acceleration. i. The value of vibration level in root mean square of velocity, Vrms in mm/s unit. 11. 111. iv. The display of frequency spectrum in velocity with 0.2 Hz of frequency resolution. Store all the outputs in (i-iii) into ASCII format. Note: You just need to draw and name the box to represent the block module in DASYLAB and detail out the parameter's setup for each block module. Suggest the sampling rate and block size based on the given conditions.