Recent content by tbader

I honestly don't have any specifics as I am just learning and still trying to determine the best sensor around my constraints (price, range, and enclosure size). Either an audible alarm or visual light would be ideal. The power would be batteries as it is outside and often would be moved. From...

Its for sensing large objects at a construction job. Looking for a range of 16-18ft and just for proximity purposes (not distance measuring). One of the constraints is making it very low profile which requires a small sensor. Dimension of the encasing is cylindrical with rough dimensions of 55 x...

I am open to any type of proximity device. The main constraints are price and range. Considering a lot of proximity sensors do not work through a solid medium, maybe a laser sensor would be better + I could conceal

They all have very low detection ranges (~cm), I am looking for 'long distance' (16-18ft).

I am new to sensors and am looking for an ultrasonic sensor with a range up to 16-18 feet for very low costs (<$10). Most sensors I have found for this project are pricey relative to the cost I imagined. Are these type of sensors the best option if I am looking for low cost/long distance...

So if I set up the piezo in a circuit to determine the power and at let's say 15Hz the output is 50mW. Does that mean per actuation (every 66ms [1/15Hz]), the output would be 3.33 mW (50mW/15Hz). Does this make sense on how you would characterize output power based on a single actuation?

How would you propose going about this? I am looking to achieve about 10mW per actuation with about 20Hz. Obviously the force is going to impact the overall power as a larger force yields a larger output. Most achieve the most power at resonance which is the problem I am currently dealing with.

So wouldn't you characterize this by just taking the input energy to the cap bank? The electrical contribution equation that I have seen in terms of material properties is; We = V/2 * k332*s33D*P2 What other equation would be needed? K33 = Mechanical coupling factor s33=elastic compliance...

What about for storage purposes like a small cap bank or battery?

Many of the searches use numerous different variables to characterize the output power. I am looking for more of a concise equation relative to my specific component of a ceramic multi-layer rectangular generator. I essentially am looking to find the error of the theoretical and calculated...

Thank you but I am looking for more specific information on the power output. The max deflection and voltage equation is useful but not applicable to what I am looking for

What are the governing equations to determine the output energy of a ceramic rectangular multi-layer piezoelectric component after one actuation? I am familiar with most of the properties and looking to characterize a piezo component from the direct piezo effect.

Just as a comparison to conventional cars, not looking for very specific numbers as each EV is different as well

Electric vehicles convert about 60% of the electrical energy from the battery to power the wheels—conventional gasoline vehicles only convert about 20% of the energy stored in gasoline to power the wheels I was curious about the losses in an EV relative to a conventional car

yes, only operating energy costs. I guess my question is what are the percentage losses at various systems within an EV like the picture displays above for a conventional vehicle.