Preview Questions NVH Engineer | Role Specific Skill

Question 1: In vibration analysis, what does the term "octave band analysis" refer to?

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The calculation of the energy level in the system

The measurement of vibrations at a single frequency

The averaging of vibration amplitudes over time

The division of the frequency spectrum into logarithmic bands for better resolution

Question 2: In active noise control (ANC) systems for vehicles, what is the primary function of the secondary source?

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Generate anti-noise signals to cancel out unwanted noise

Provide power to the ANC system

Detect unwanted noise

Amplify cabin audio for better sound quality

Question 3: In vibration analysis, what is the purpose of a fast Fourier transform (FFT)?

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To convert time-domain data into frequency-domain data for identifying vibration modes

To measure the total vibration energy of a system

To determine the damping ratio of a vibrating component

To isolate specific vibration frequencies in the system

Question 4: What is the significance of a power spectral density (PSD) plot in NVH testing, and how is it used?

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It is used to calculate the power consumption of the vehicle

It provides a graphical representation of the vibration amplitude across a range of frequencies, aiding in vibration source identification

It is used to measure the engine's torque output

It represents only the noise level inside the cabin

Question 5: What is the primary purpose of using a calibrated shaker table in automotive NVH testing?

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To isolate the vehicle from external vibrations

To measure sound pressure levels

To record vibration data from sensors

To generate controlled vibration inputs for component testing

Question 6: What is the significance of using a "compounding curve" in automotive sound quality analysis?

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It isolates specific sound frequencies for further study

It measures the sound level variations over time

It characterizes the spectral density of road noise

It quantifies the effect of multiple overlapping sound sources and their combined effect on perception