Preview Questions NVH Engineer | Role Specific Skill

Question 1: Which standard is primarily used for conducting subjective noise, vibration, and harshness evaluations in the automotive industry?

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SAE J1455

IEC 60068

ISO 14001

ISO 7626

Question 2: In NVH testing, what does the term "coincidence frequency" refer to?

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The frequency at which structural resonances occur

The frequency at which the wavelength of sound matches the natural frequency of a structure, leading to increased vibration

The peak frequency of tire noise

The frequency of engine harmonics

Question 3: How do you ensure repeatability and consistency in NVH testing when dealing with varying test conditions?

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By running a single test and assuming the results are consistent

By focusing only on visual observation and ignoring sensor data

By performing tests in a non-controlled environment

By standardizing test procedures, ensuring proper calibration, and controlling environmental variables during testing

Question 4: How does "soundproofing glass" help reduce noise in automotive applications?

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By allowing sound waves to pass through easily

By enhancing the visual aesthetics of the vehicle

By reflecting noise back to the environment outside the vehicle

By blocking a wide range of sound frequencies from entering the cabin

Question 5: During the calibration of a microphone for cabin noise measurements, which parameter is most critical to ensure accurate frequency response?

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Impedance

Dynamic Range

Directionality

Sensitivity

Question 6: How is the "sharpness" of an automotive sound quantified, and why is it important in sound quality analysis?

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Sharpness is unrelated to the vehicle's performance

Sharpness quantifies the perception of high-frequency content and is used to assess discomfort or irritation caused by certain sounds

Sharpness quantifies the amount of vibration in the suspension

Sharpness measures only low-frequency noise