Force-Displacement Transfer Function You will be using an amplifier to condition

Question

Force-Displacement Transfer Function You will be using an amplifier to condition the voltage signal from the force transducer (the amplifier affects the signal from the force transducer, such that the voltage read at the RIO = VFT = Gain * VF, where VF is the voltage read at the force transducer). Below is some data gathered to characterize the gain of the amplifier. The input amplitude is 100 mV (pk-pk) and the output amplitude is 20 V (pk^pk) Amplifier Input/Output Voltage 0.2 0.15 S 0.1 0.05 -0.05 0.15 0.2 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 Time (s) Output Voltage (Right) -Input Voltage (Left) Figure 5: Characterization of an amplifier 9. What is the gain of the amplifier? In the VI, you make the following settings: Function Generator: Sine The "Voltage Input" sets the amplitude of the shaker vibrations. You test a series of frequencies, recording the voltage amplitude (at the myRIO) from the LDV and the force transducer. You gather the following data Voltage Input: 0.1 V 10. Using the data from the LDV, calculate the velocity amplitude and the displacement amplitude. Fill in the colum Remember that the conversion constant for the LDV is 0.025 7n 11. Using the data from the force transducer, calculate the force amplitude. Fill in the column 1. The conversion constant for the force transducer is 2. Remember to account for the amplifier that you characterized in question 1 11.214 mV

Explanation / Answer

Answer 9.

Input voltge is 100 mV , i.e. , 0.1V

Output is 10 V.

Gain is ratio of output to input voltage.

Gain=10/0.1=100.

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