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Comm Diss 311-page34

# Comm Diss 311-page34 - other letters 8.3 Which frequency is...

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9 8. Impedance 8.1. The questions below pertain to a simple mechanical system with mass, compliance and resistance. On the complex plane of real and imaginary impedance, plot a single point corresponding to the total impedance for each of a combinations below (use one graph for all nine and use the letter of the problem to specify the point). Draw an arrow to each of the letters. All of the values below are in ohms. Resistance Mass Reactance Compliance Reactance a. 100 10 2560 b. 100 20 1280 c. 100 40 640 d. 100 80 320 e. 100 160 160 f. 100 320 80 g. 100 640 40 h. 100 1280 20 i. 100 2560 10 8.2. Assuming that the frequency for (a) above is 125 Hz, what is the frequency for each of the
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Unformatted text preview: other letters. 8.3. Which frequency is the natural frequency of the system? 8.4. What is the magnitude of the impedance at 2000 Hz? 8.5. What is the phase of the total impedance in at 2000 Hz? 8.6. What is the magnitude of the total impedance at 8000 Hz? 8.7. If the mass of the system were doubled without changing anything else, what would be the natural frequency of the system? 8.8. If the resistance was increased to 10,000 ohms without changing anything else, what would be the natural frequency of the system?...
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