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Question 4 1.00000 points Save Answer Identify from the list below what are the benefits of laser torsional vibrometry Insensitive to variations in rotating target cross-section Insensitivity to translational vibration component All of the above Non-contact in operation, therefore limited installation overhead (compared to traditional tecchniques) Sensitive to laser speckle noise which leads to components at rotation frequency and harmonics Low sensitivity and poor frequency range Reliable and robust and can therefore be operated in extreme conditions and harsh environments None of the above Question 2 1.00000 points Save Answer Two alternative methods for evaluating the measured response of a system are the use of peak-peak readings and root mean square (RMS) measurements. For non-harmonic measurement data (i.e. white noise) select each of the correct statements below. There can be more than one correct answer Peak-peak measurements are more consistent than RMS measurements over multiple readings. Peak-Peak measurements rely on only two readings from measured data and are therefore more consistent across multiple sets of measurement. Peak-Peak measurements are influenced strongly by outliers in a data set RMS measurements are collated from larger data sets and should be more consistent than Peak-Peak measurements. RMS measurements will vary more than Peak-Peak measurements when taking multiple readings of the same apparatus. All of the answers are correct. Question 5 1.00000 points Save Answer For the experimental arrangement you are familiar with from the lab, calculate the rotational LDV sensitivity (in rad/s/V) for the following scenario (which might be different to that which you observed) Accelerometer sensitivity 20 mV/m/s2 A measured (by the accelerometer) peak-to-peak translational vibration acceleration of 400 mV A translational vibration frequency of 40 Hz A gear pitch diameter of 12 mm A measured (by the laser torsional vibrometer) peak-to-peak angular vibration velocity of 70 mV

Answer 1

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