2. Schematic of drag force measurement system utilized in sphere drag experiment

Question

2. Schematic of drag force measurement system utilized in sphere drag experiment: Wind tunnel multiplexer Amp Bridge Pyramid balance Lowpass filter Digital Voltmeters Strip-chart recorder Ch.1 Ch.2 Analog oscilloscope Ch.1 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 I, 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 G, of 20dB and 0--25 mV Instrument 3, the lowpass filter, with unity gain G, and 0,-9.0mV; Instrument 4, the voltmeter, with K, 1.03 (what units2) and 0--11mV Draw a block diagram for the 4-instrument system, labeling the intermediate signals between instruments as xy. and z respectively, with F the input and W the output. i. ii. Construct an analytical expression for each Instrument's response function. ii. Derive the system response function. iv. Determine the system sensitivity-evaluate the sensitivity at 1.0 N input force. V Determine the force being measured if the voltmeter reads 0.72 volt.

Explanation / Answer

Functional intstruments: wind tunnel

                                    pyramid balance

                                    strain gauge load cell

                                    amplifier

                                   filter

                                  strip chart recorder

                                 analog oscillosocpe

note: post second question separately

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