Piezoelectric ceramics in a robotic limb

In summary, piezoelectric ceramics are being considered as a potential substitute for muscles in robotic limbs. However, there is a lack of practical use due to the small amount of motion and low work density provided by these devices. Other technologies, such as hydraulic systems, are currently being used to power robotic limbs with sufficient force and speed.
  • #1
TheCuts
4
0
piezoelectric ceramics, are they a good substitute for muscles in a robotic limb, and would they make it move in a similar manner to a real limb
 
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  • #2
That is such a vague question. You're asking if some type of material that gains charge due to deformation can replicate muscles for a robotic arm. There is no answer to that unless there's some kind of setup that you're just replacing the material with a ceramic. Or am I missing something?
 
  • #3
The reason I asked this is because they expand upon being subject to an electric current. This is like a muscle that can expand and contract to move our limbs.
 
  • #4
Though I may be missing some information too.
 
  • #5
Notice, please, that mechanical deformation of a piezoelectric crystal is not caused by “an electric current”. It is caused by the application of an external electric field.

“Lead zirconate titanate crystals will change about 0.1% of their static dimension when an external electric field is applied to the material.”

See section on “Actuators” especially:

http://en.wikipedia.org/wiki/Piezoelectricity#Actuators

Since the amount of motion is Very Small, we could not just substitute a p. crystal for a bicep, for example.
 
  • #6
I don't think piezoelectric devices would provide sufficient displacement+force to be of any practical use in robotic devices. The work density is too low. Look at all of the various devices being developed by DARPA...they are still constructed with umbilicals pumping hydraulic fluids to provide sufficient power to move links fast enough, and with enough force.
 
  • #7
Thanks that's all I needs to know.
 

Related to Piezoelectric ceramics in a robotic limb

1. How do piezoelectric ceramics work in a robotic limb?

Piezoelectric ceramics are materials that generate an electric charge when subjected to mechanical stress, such as pressure or vibration. In a robotic limb, these ceramics are strategically placed to convert the mechanical movement of the limb into electric signals, which can then be used to control the movement of the limb.

2. What are the benefits of using piezoelectric ceramics in a robotic limb?

Piezoelectric ceramics offer several benefits in a robotic limb, including their small size, lightweight nature, and high sensitivity. They also have the ability to generate precise and quick responses, making them ideal for use in delicate and precise movements required in a robotic limb.

3. How are piezoelectric ceramics integrated into a robotic limb?

Piezoelectric ceramics are typically integrated into a robotic limb through a process known as bonding, where the ceramics are attached to the limb's surface. They can also be embedded within the limb's structure, depending on the design and purpose of the limb.

4. Are there any limitations to using piezoelectric ceramics in a robotic limb?

While piezoelectric ceramics offer many benefits in a robotic limb, there are some limitations to consider. These ceramics have a limited range of movement and require a high voltage to generate a significant amount of electric charge. They are also sensitive to high temperatures and can be damaged if exposed to extreme heat.

5. How do piezoelectric ceramics compare to other types of sensors in a robotic limb?

Piezoelectric ceramics have several advantages over other types of sensors commonly used in robotic limbs. They are smaller, lighter, and more sensitive, making them ideal for use in precise movements. However, they may not be suitable for all types of movements, and other sensors, such as strain gauges and accelerometers, may be more appropriate in certain situations.

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