Compensate for the displacement of an accelerometer measurement

In summary, the individual is seeking advice on how to measure lateral acceleration at the center of gravity of a vehicle, despite not being able to place the accelerometer there. They have placed it 75 cm to the left of the CG and are wondering if there is a way to compensate for this misplacement. They welcome any tips, hints, papers, or links on the topic. Additionally, they have found a basic dynamics equation that may be helpful in understanding the acceleration at a point.
  • #1
rabun
4
0
Hello
I want to measure the lateral acceleration at the center of gravity of a vehicle. I cannot place the accelerometer here since I cannot mount it properly so I have placed it 75 cm to the left of the CG. The longitudinal and and vertical placement is approximately correct.

It there som way to compensate for the misplacement of the sensor? so that the acceleration measured and corrected it the one experienced at the CG?

Tips, hints, papers, links and so on are more than welcome

Thank you kindly for any and all help
 
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  • #2
Basic dynamics sir:

[tex] a_p=a_{cg}+\dot{\omega}_B \times r_s + \omega_B \times \left(\omega_B \times r_s \right) + 2\omega_B[/tex]

Where

[tex] a_p[/tex] is the acceleration at the point in question
[tex] \omega_B [/tex] is the angular velocity of the body
[tex] r_s [/tex] is the position of the sensor in question

google dynamics for acceleration at a point for an explanation of each term
 
  • #3
Thank you:) Some times it's just a matter of not knowing how to phrase your search. It helped, thanks.
 

1. What is displacement in the context of accelerometer measurements?

Displacement refers to the change in position of an object over time. In the context of accelerometer measurements, it is the distance an object has moved from its original position, typically measured in meters.

2. Why is it important to compensate for the displacement of an accelerometer measurement?

It is important to compensate for displacement because it can affect the accuracy of the accelerometer reading. If displacement is not accounted for, the measured acceleration may include the effects of gravity or other external forces, leading to inaccurate results.

3. How is displacement compensated for in accelerometer measurements?

Displacement can be compensated for in accelerometer measurements by using advanced algorithms and techniques such as double integration or Kalman filtering. These methods take into account the acceleration and velocity of the object to calculate its displacement accurately.

4. What are some common sources of displacement in accelerometer measurements?

Some common sources of displacement in accelerometer measurements include vibration, movement of the sensor itself, and external forces such as gravity or magnetic fields. These factors can cause the sensor to detect acceleration even when there is no actual movement of the object being measured.

5. Are there any limitations to compensating for displacement in accelerometer measurements?

Yes, there are some limitations to compensating for displacement in accelerometer measurements. In some cases, the algorithms used may not be able to accurately account for all sources of displacement, leading to errors in the measurement. Additionally, the accuracy of the compensation may also depend on the quality and precision of the accelerometer itself.

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