Wind tunnel 2. measurement system utilized in sphere drag experiment: Schematic

Question

Wind tunnel 2. measurement system utilized in sphere drag experiment: Schematic of drag force Flow Channel multiplexer Amp Bridge Pyramid balance Strain·gauge. load. cell Lowpass filter Digital Voltmeters Strip-chart recorder Analog oscilloscope 29.8 Ch.2 Ch.2 2. (cont.) Label the functional instrument groups 1-3 in the diagram using our generic measurement system terminology. Considering the system as four equivalent linear instruments connected in series: a. b. Instrument 1, consisting of the sphere/stinger/strut, balance, load cell and bridge circuit, and having a composite sensitivity K, of 4.0 mV/N and composite DC zero offset O, of 27 mV; Instrument 2, the amplifier, with a gain G2 of 20dB and O2- -25 mV; Instrument 3, the lowpass filter, with unity gain G and O3-9.0 mV; Instrument 4, the voltmeter, with K4-1.03 (what units??) and O4 --1lmV; Draw a block diagram for the 4-instrument system, labeling the intermediate signals between instruments as x.y, and z respectively, with F the input and W the output Construct an analytical expression for each Instrument's response function Derive the svstem response function Determine the system sensitivity - evaluate the sensitivity at 1.0 N input force. Determine the force being measured if the voltmeter reads 0.72 volt ii. iii. iv. v.

Explanation / Answer

Function instruments:

wind tunnel

pryamid balance

strain guage load cell

amplifier

filter

strip chart recorder

analog osilloscope

note :post second question separately

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