Setting Up a Mechanical/Electrical Inertia Measurement of Propellerarm

In summary, George P. is seeking advice on how to set up a test stand to measure the relationship between rising thrust and inertia in a propellerarm for a flight robot. They are considering using a forcespring, pendulum, or camera with a timer, but are unsure of the best setup. They are also seeking clarification on the definition of "inertia" in this context and are designing a drone.
  • #1
Ginorizz0
2
0
TL;DR Summary
how to setup a teststand for rotating propellerarm with rising rpm of the propeller.
Hello Everybody
I'd like to set up a mechanical or electrical inertiameasurement of a Propellerarm that is in rotation, while the thrust (rpm of propeller) is rising.
Maybe with a forcespring, a pendulum, camera (timer)...
Not sure how to set it up nicely. Any suggestions?
Best
George P.
 
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  • #2
Welcome to PF. :smile:

Ginorizz0 said:
TL;DR Summary: how to setup a teststand for rotating propellerarm with rising rpm of the propeller.

Hello Everybody
I'd like to set up a mechanical or electrical inertiameasurement of a Propellerarm that is in rotation, while the thrust (rpm of propeller) is rising.
Maybe with a forcespring, a pendulum, camera (timer)...
Not sure how to set it up nicely. Any suggestions?
Best
George P.
Can you say more about what you are wanting to do? Is this for some sort of wind farm turbine, or for a wind tunnel, or for some other application? The more details you can provide, the better we can help you.
 
  • #3
Ty:)
The general question is: Does the rising thrust of the propeller change the inertia of the whole propellerarm.
Its about a flightrobot with omnidirectional abilities, but first i'll need to show experimentally the thrust to inertia-relation. In the end i'll actuate the arm with the right drive.
 
  • #4
Sorry, I'm still not clear on what you want to do. When you say the "thrust is rising", is it rising because you are increasing the motor power to the propeller? Or are you modulating the pitch of the propeller to increase the thrust? (or both?)

Also, can you please give a mathematical definition of what you mean by "inertia" in this context? I'm guessing you mean something other than the traditional definition of the Moment of Inertia...

Are you designing a drone?

Drones-strategy-2.0-FEATURED-image-LIGHT_0.png

https://www.easa.europa.eu/en/light/topics/drones
 

FAQ: Setting Up a Mechanical/Electrical Inertia Measurement of Propellerarm

What equipment do I need to set up a mechanical/electrical inertia measurement of a propeller arm?

To set up a mechanical/electrical inertia measurement of a propeller arm, you will need a high-precision gyroscope, accelerometers, a data acquisition system, a power supply, a calibration rig, and mounting fixtures to secure the propeller arm during measurement. Additionally, software for data analysis is essential to interpret the measurements accurately.

How do I calibrate the sensors for accurate inertia measurement?

Calibration of sensors involves using known reference standards to ensure that the measurements are accurate. This typically includes placing the sensors in a controlled environment where the actual values are known and adjusting the sensor outputs to match these values. For gyroscopes and accelerometers, you might use a precision turntable or a vibration table with known characteristics to perform the calibration.

What are the common sources of error in inertia measurements and how can I minimize them?

Common sources of error in inertia measurements include sensor noise, misalignment of sensors, external vibrations, and temperature variations. To minimize these errors, ensure that the sensors are properly aligned and securely mounted, use low-noise sensors, isolate the measurement setup from external vibrations, and perform measurements in a temperature-controlled environment.

How do I interpret the data collected from the sensors?

Interpreting the data involves converting the raw sensor outputs into meaningful physical quantities such as angular velocity and acceleration. This typically requires the use of specialized software that can process the data, apply necessary calibrations, and compute the inertia properties. The data is often analyzed in the frequency domain to identify any resonant frequencies and to understand the dynamic behavior of the propeller arm.

Can I automate the data collection and analysis process?

Yes, the data collection and analysis process can be automated using a combination of data acquisition hardware and software. Modern data acquisition systems often come with software that can be programmed to control the measurement process, log data, and perform real-time analysis. Automation not only improves efficiency but also reduces the potential for human error in the measurement process.

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