9 votes
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Units for rotational impedance

Radians and unit analysis The comment by MrYouMath is correct. For the purposes of dimensional analysis, the radian is considered a dimensionless quantity and therefore does not need to be included. ...
ConjuringFrictionForces's user avatar
7 votes
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Does any know what kind of pump "Colossus" used for saving the Notre Dame Cathedral?

This is not a definitve answer, but since I went to the trouble to look it up I thought i might as well post what I found: Pretty sure there's no onboard pump As you can see this is a normal firehose,...
mart's user avatar
  • 4,781
5 votes
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Are precision pneumatics possible?

While pneumatic systems can be controlled in a non-discrete manner as GisMofx mentioned, that is generally not the norm because the control system to achieve that movement is more expensive that ...
ericnutsch's user avatar
  • 8,136
4 votes

How to design a vacuum climbing robot

You do not need full vacuum to accomplish your goal. A small amount of vacuum pressure adds up really quick over a large surface area. Try to make the entire footprint of your robot under vacuum; your ...
ericnutsch's user avatar
  • 8,136
4 votes

How do robots maintain stability?

PID, LQR, and LQG feedback control laws are only small pieces of the solution. Alone, these methods generally cannot solve the problem of balanced bipedal walking. The reason why is because these ...
Paul's user avatar
  • 2,569
4 votes

How can I implement S-curve motion profile on mobile robotic platform / wheeled robot?

There are many ways to create a trajectory between two points using a sigmoid function. It's not a simple question, and the math is a little involved. Here's how I would do it. Short Answer You can ...
BarbalatsDilemma's user avatar
4 votes
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Torque Problems vs Motor Problem?

The motors have a rated speed of 2750rpm. It doesn't look like there's much of a gear ratio, so at the moment the motors spin at the same speed as the wheels. With 16" wheels, 2750rpm is about ...
sqek's user avatar
  • 156
3 votes

How to design a vacuum climbing robot

An important point in the fluid dynamics design is about control points. A simple experiment - hold your hand over a hose on the vacuum cleaner, you'll notice a light vacuum pulling on it, but hold ...
Mark's user avatar
  • 5,333
3 votes
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Artificial Intelligence in manufacturing machines

In general terms what you really want from CNC machines is to repeat the same actions exactly the same every time, while you may need to monitor and account for things like tool wear, temperature ...
Chris Johns's user avatar
  • 15.2k
3 votes

Are precision pneumatics possible?

Yes, it's possible. See here: Position Control of a Pneumatic Actuator and this youtube video here: Pneumatic Actuator With Position Control on YouTube Many solutions use a servo controlled ...
GisMofx's user avatar
  • 1,578
3 votes

Can CO2 produce energy to drive a bot

Potentially yes. There are a lot of homemade toys which use a reaction between vinegar and bicarbonate of soda to make simple CO2 jet engines. However if you want to use this sort of reaction to ...
Chris Johns's user avatar
  • 15.2k
3 votes
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4 Gears in a Circular Pattern - Calculating the Proper Distances for Meshing

Let’s consider gears as being represented by a pitch circle on which lie several equally spaced dots with a number equal to the number of teeth. These dots can either represent the teeth or the gaps ...
Involute's user avatar
  • 1,337
3 votes
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Kalman filter for sensor fusion — what is the advantage?

You can't just "average the two sensors" The acceleration readings are essentially meaningless unless you know their direction, you can't know their direction unless you have the platform ...
TimWescott's user avatar
  • 2,522
3 votes
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Small scale manufacturing

I believe the key here is not the material, but the manufacturing method. I would not recommend a small cnc machine, which seems to be what you're considering. Those are cool and fun, but you will ...
Drew's user avatar
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3 votes
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High pass filter and differential equation relationship

It can be noted that the high-pass filter can also be written as $$ \frac{s}{s + \omega} = 1 - \frac{\omega}{s + \omega}, $$ such that $$ \frac{s}{s + \omega} Y(s) = Y(s) - \underbrace{\frac{\omega}{s ...
fibonatic's user avatar
  • 1,653
3 votes

How can I calculate a robotic arm's maximum reach?

Total reach is usually the straight line length of each member added together, do work centre to centre. The manufacturer will specify the total load at a spcific configuration so check the detail.
Solar Mike's user avatar
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3 votes
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Are vacuum actuated artificial muscles as hard to control as the pneumatic ones?

With a vacuum you are limited to the pressure differential between zero and atmospheric (~100kPa or ~15PSI). With pneumatic you are limited to the pressure differential between atmospheric and ...
DKNguyen's user avatar
  • 5,491
2 votes

Steering wheel torque when car is turning

It heavily depends on the caster that the suspension is set at. Caster makes the wheels go back to neutral position. The more caster, the more torque is needed to keep the wheel at a position. Scrub ...
Bart's user avatar
  • 1,184
2 votes
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DC brush geared motor: coast vs brake effects on motor/gearhead lifespan

The forces of breaking a motor by shorting its electrical connections are the same as starting the motor with full voltage applied. Actually, they'd only be the same in a ideal motor. In any real ...
Olin Lathrop's user avatar
  • 11.4k
2 votes

How do robots maintain stability?

The robot likely has a body accelerometer & integrates it to use a velocity tracking controller with some sort of explicit or implicit proportional & integral control for the body. - This ...
KnotMoving's user avatar
2 votes

How do robots maintain stability?

Clearly there are a lot of different potential solutions to this depending on the application and design approach. Also, as is clear from the video, bipedal robots are still a long way from achieving ...
Chris Johns's user avatar
  • 15.2k
2 votes

Strength of human hand compared to robot

I find I have to make a pretty large device to have anywhere near the same power as the human hand. Is the human hand, cubic centimeter for cubic centimeter just really strong compared to a machine? ...
jpa's user avatar
  • 1,943
2 votes

Tug of war robot w/ max torque

I would like to commented this on the question (but I can't due to the 50rep requirement) I don't know if wheels are obligated or there a other options? Tracks should give more friction to the ...
Mech_Engineer's user avatar
2 votes

Angles Measurement to control (move) a robotic arm

The act of calculating the angles of a robot from the position of the end eflector is called inverse kinematics. Incidenttally the reverse, calculating end efflector position from angles is called ...
joojaa's user avatar
  • 3,597
2 votes

What is the difference between a bogie and a chassis

A chassis is the term commonly used to describe the overall structure or main structure of almost anything. The case for a computer can be described as the chassis, as it holds/supports/contains the ...
fred_dot_u's user avatar
  • 7,055
2 votes
Accepted

Purpose of normalization of Jacobian in a parallel manipulator

It is because you are using the trace of the matrix, which is equal to the sum of the singular values. The ideal $\mathbf{JJ^T}$ has singular values all equal to 1, but for an $n \times n$ matrix ...
TimWescott's user avatar
  • 2,522
2 votes

High pass filter and differential equation relationship

You can show it with Laplace transform. Let's say Y = ℒ[y], H = ℒ[η], and ω_p is the filter pole. (Let's not simply call it ω -- when omega is used as a parameter rather than a variable, a subscript ...
Pete W's user avatar
  • 1,526
2 votes
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Mechanically increase motor torque

Actually if you want to keep accuracy and increase the torque you can use a gearbox that reduces the input Rpm. So you will be Sacrificing the speed for the increased torque and precision. Its also ...
NMech's user avatar
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