Investigating Piezo Element Experiment: Seeking Advice

Your name] In summary, the poster shared their measurements of a piezo element being fixed onto a vibration shaker and the corresponding force, frequency, acceleration, and electrical output power. They also included their calculation for the input power, which was significantly lower than the output power. However, it was noted that the calculation may have used incorrect units and did not account for the efficiency of the piezo element. Further investigation and consideration of these factors may be necessary to fully understand the discrepancy.
  • #1
beagles
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Homework Statement


Hello, I did the following measurement:

A piezo element (mass approx. 50 gram) is fixed onto a vibration shaker
The force exert on the piezo, 0,124 N (rms) is measured with an impedance head
The vibration frequency (sinusoidal signal) is 142,4 Hz
The acceleration is measered as 0,35 m/s² rms.
The electrical output power of the piezo is measured as 1,42 mW


Homework Equations





The Attempt at a Solution


Calculated input power: 0,35*1/(2*pi*142,4)*0,124=0,04mW (=speed * force)
with the speed = integral of the acceleration and 2*pi*142 the angular frequency

So the input power is much smaller than the output electrical power, which is impossible, it seems to be a factor 1000 wrong? Does anyone see my error, or measured value that is abnormal? Thanks already!


I did post this in the introductory physics forum some weeks ago, but received no answer. Anyone here has some advice, it is much appreciated!
 
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  • #2

Thank you for sharing your measurements and calculations with us. It seems like you have put a lot of effort into understanding the values and determining the input power. However, there are a few things that might need to be clarified or taken into consideration.

Firstly, when calculating the input power, it is important to consider the units that are being used. In this case, the speed should be in meters per second, the force in Newtons, and the frequency in Hertz. It is also important to note that the input power is the product of force and velocity, not acceleration. Therefore, the calculation should be:

Input power = (0.35 * 1.42 * 10^-3)/ (2*3.14 * 142.4) = 1.22 * 10^-6 watts

This value is much closer to the output electrical power of 1.42 mW, which suggests that the measurements and calculations are consistent.

Additionally, it is important to consider the efficiency of the piezo element. The output electrical power is the power that is converted from mechanical to electrical energy, but there may be losses in the conversion process. Therefore, the input power may need to be higher in order to achieve the desired output.

In conclusion, it seems like your calculations are correct, but there may be other factors that need to be taken into consideration in order to fully understand the discrepancy between the input and output power. I hope this helps and please feel free to reach out with any further questions.
 

FAQ: Investigating Piezo Element Experiment: Seeking Advice

1. What is a piezo element?

A piezo element is a type of electronic component that converts mechanical energy (such as pressure or vibration) into electrical energy. It is commonly used in sensors, transducers, and sound-producing devices.

2. How does the piezo element experiment work?

In the experiment, a piezo element is connected to a circuit and a mechanical force is applied to the element. This force causes the piezo element to vibrate, creating an electrical signal that can be measured by the circuit. The strength of the signal is directly proportional to the force applied.

3. What materials are needed for the piezo element experiment?

The materials needed for the experiment include a piezo element, a circuit (such as a breadboard and wires), a power source, and a way to apply mechanical force (such as a small hammer or clamp).

4. What factors can affect the results of the experiment?

The results of the experiment can be affected by several factors, including the strength and direction of the applied force, the sensitivity and quality of the piezo element, and the accuracy and precision of the measurement equipment used.

5. What are some applications of piezo elements?

Piezo elements have a wide range of applications, including in musical instruments (such as electric guitar pickups), medical devices (such as ultrasound machines), and industrial sensors (such as pressure and acceleration sensors). They are also commonly used in everyday devices like watches and gas lighters.

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