Has the impeller been replaced?
If so, have both resonated at the same rotational speed?
Have both been balanced, both statically and dynamically?
Same shaft for both impellers?
Could you explain a little more about the fluid being transferred?
Is it a gas carrying no solids or mist?
Welcome, @ArnoVonck !
How have you determined the 18.1 Hz impeller frequency?
Should not this value be equal to the control frequency if motor and fan are directly linked?
How would you describe the resonance of the system?
What is the direction of the greatest oscillation?
Could it be that...
Thinking of the consequences of failure only robs the precious energy and determination that help you overcome the challenge.
Negative thinking induces paralyzing fear; resolution and positive action can and should replace it.
Move your feet from the brake pedal onto the accelerator. :smile...
It seems to be a simple test for someone who is well rested, worry-free and knows the principles.
Your competitors will not be as...
Welcome, @kingsbishop !
It is different for wings because they don't have the solid connection to Earth that your bar for chin-ups has.
Wings need to move through air quick enough to create a semi-solid support from the surrounding air.
That semi-solid cushion of air can't sustain the wings...
Yes, fresh fluid will greatly help.
It seems that your tube is suffering a pitting corrosion.
If so, many more pin-holes are currently developing.
You can look up "Rust remover jelly" for local options.
Loctite has good...
Rust may be working its way out, since brake fluid is highly hygroscopic.
Also, when one branch fails, most cars lose pressure in one front brake and the opposite rear brake (rather than both front or both rear calipers).
There are commercial products that stop the rust without the need for...
Then, for the second part of the video you were referring to the sucking effect between hose end and flat lid.
This happens because the Bernoulli effect, as the fluid velocity under the hose nozzle is greater than the one above.
Welcome, @byarble !
Friction is the main thing to overcome in that case, unless your stake hits solid rock.
Power actuated pins into steel beams are also hold in place by friction.
The normal force comes from the elasticity of the deformed metal into which the pin is forced.
The weld is calculated based on its cross-area times length besides yield stress.
If we are still discussing two plates of Aluminum, both being 2" tall, and 1/2" thick, please consider how small this cross-section, which resists bending is.
Any welding or drilling will weaken the main 2" tall...
I worked with an old engineer (80 years old!) who could do relatively simple calculations mentally and tell me the proper result before I could do the same with a hand calculator.
He always finished first and never made a mistake.
He did not have any special job, but while working together, he...
By clicking on the link located at the bottom right corner of each page of that first link, you will be taken to the next page, which has some explanation and comparison of resistance to bending between beams formed by attached and detached layers of material.
The welding creates a path for the...
Apologies about the delayed response.
Your work looks good, but your value of Dx is incorrect.
Member DE acts as a beam supported at both ends, not like a cantilever beam.
That is because pivot E can't provide any reactive moment.
Simultaneously, pin D is not free to rotate around pivot E under...
What other way could it be?
But you would greatly increase the area moment of inertia to resist bending.
If heat is a problem, you could resort to mechanical fastening using rivets or bolts or even self-drilling metal screws.
Filling the hollow interior with a solid would prevent the walls to be deformed and less stress on...
I would say yes.
The coefficient modifies the product of area and temperature difference to produce a value of thermal energy flow.
That flow rate is greatly affected by the conditions of the film of fluid located closest to the walls, like velocity, turbulence, viscosity, hard deposits on the...
That difference of temperatures, if substantial and continuous due to good heat transfer on both halves of the loop, may help your pump.
If most thermal energy does not remain in the fluid, something else is needed to stablish and keep a flow, overcoming friction and turbulence.
There is phase...
Note that support A is of a type that is unable to take horizontal loads.
Link BD is working under compression, while link BE is working under tension.
Therefore, there are two x-component forces acting on B in opposite directions.
Yes, in centrifugal pumps, blowers and steam turbines, but not at those rpm's.
Vibration and heat may be a problem in your application.
Turbochargers for combustion engines spin very fast and need to be very carefully balanced.
I don't believe that grease will help in your case.
Using an accelerometer would be the most precise test to perform.
You can at least estimate a reasonable maximum distance the floor and body will deform during impact.
”After a free fall from a height followed by deceleration over a distance...
Or just for understanding the principle on which the system works, you could disregard the little mass.
The little mass induces a CCW moment that is 24.5 times smaller than the CW moment that the big mass induces.
Then, you have a mass oscillating about a pivot after being released from a...
Perhaps the issue is that you have not considered the surface of the water to be 8 m above the floor or bottom of the tank and 2 m below the apex?
I find this statement a little confusing: “empty the tank by pumping all of the water to the top of the tank.”