How to find spring constant & damping coef of speaker flexure

In summary, Ivan is looking for information on the two parameters needed for his transfer function in his final year project involving an audio speaker. The two parameters are the spring constant and damping coefficient of the speaker flexure. Berkeman suggests using a small force-measuring device to measure displacement for the k value and tapping the center of the speaker's cone and using an oscilloscope to calculate the damping coefficient. Ivan expresses his gratitude for the help.
  • #1
ivan6496
2
0
Hi anyone,

I'm doing my final year project requires to use audio speaker. I need to know the two parameters for my transfer function. They are spring constant and the damping coefficient of the speaker flexure. Can anyone give me some idea?

Best Regards,
Ivan
 
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  • #2
Just use a small force-measuring device to measure the displacement for a range of forces. That will give you the k value. You could even just turn the speaker vertical and set small weights on it and measure the displacement with calipers.

As for the damping coefficient, maybe you can tap it (the center of the cone) and measure the output from the speaker with an oscilloscope. Capture the damped sinusoid output (probably fairly small for light taps), and calculate the damping coefficient from that waveform.
 
  • #3
Speaker K & b (thank you)

Hi Berkeman,

Thanks for the help. Appreciated.

Best Regards,
Ivan:smile:

berkeman said:
Just use a small force-measuring device to measure the displacement for a range of forces. That will give you the k value. You could even just turn the speaker vertical and set small weights on it and measure the displacement with calipers.

As for the damping coefficient, maybe you can tap it (the center of the cone) and measure the output from the speaker with an oscilloscope. Capture the damped sinusoid output (probably fairly small for light taps), and calculate the damping coefficient from that waveform.
 

1. What is the purpose of finding the spring constant and damping coefficient of a speaker flexure?

The spring constant and damping coefficient of a speaker flexure are important parameters that determine the behavior and performance of a speaker. They help in understanding the flexibility and stability of the speaker's suspension system, which affects the sound quality and efficiency of the speaker.

2. What is the process of finding the spring constant and damping coefficient of a speaker flexure?

The process of finding the spring constant and damping coefficient of a speaker flexure involves performing a series of tests and measurements on the speaker. This usually includes measuring the displacement of the speaker cone under different loads, as well as measuring the resistance and reactance of the speaker's voice coil. These measurements are then used to calculate the spring constant and damping coefficient of the speaker flexure.

3. What factors can affect the accuracy of the measurements for spring constant and damping coefficient of a speaker flexure?

The accuracy of the measurements for spring constant and damping coefficient of a speaker flexure can be affected by various factors, such as the quality of the equipment used, environmental conditions, and the skill of the person performing the tests. It is important to use precise and calibrated equipment, conduct the tests in a controlled environment, and follow proper measurement techniques to ensure accurate results.

4. What are the units of measurement for spring constant and damping coefficient of a speaker flexure?

The spring constant is typically measured in units of N/m (newtons per meter), while the damping coefficient is measured in units of Ns/m (newton-seconds per meter). In some cases, the damping coefficient may also be expressed in the unit of ohms (Ω) as it represents the resistance to the movement of the speaker cone.

5. Can the spring constant and damping coefficient of a speaker flexure change over time?

Yes, the spring constant and damping coefficient of a speaker flexure can change over time due to various factors such as wear and tear, temperature changes, and environmental conditions. Regular maintenance and calibration of the speaker can help in maintaining the accuracy of these parameters over time.

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