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Do utilities ever disconnect solar panels in cases of low demand?

This question asked something that was predicated on "solar roof installations [being] disconnected from [the] grid" for low demand. Do utilities ever disconnect solar installations for low ...
user1683793's user avatar
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8 views

Unable to calculate Thevenin resistance and Norton's current

I have to solve for the Thevenin voltage, Thevenin Resistance and Norton's current for the two following questions. For question C, I am able to calculate the Thevenin Voltage and Norton's current, ...
Nathan Johnson's user avatar
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13 views

Static approach in fluctuating load please help

I came across a question which was asked last year in the university exam. A cantilever beam made of cold rolled steel ultimate tensile strength= 540 Mpa and yield tensile strength= 360 Mpa expected ...
user47882's user avatar
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1 answer
18 views

"Increasing the water pressure" in the old pipes in the Palace of Knossos

In the Palace of Knossos, Crete, Greece there is an old piping system partially preserved, with the following commentary: Series of clay pipes with one end narrower than the other so that they could ...
Honza Zidek's user avatar
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12 views

Seeking Advice: Improving Resin Application in Honeycomb Lamination for a Sustainable Project

I am trying to laminate a honeycomb structure with a fiberglass and resin reinforcement. However, I have problems because a large amount of resin falls through the holes of the honeycomb and the final ...
BeeSwell's user avatar
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9 views

Method to calculate required gear size and teeth size for a rack system for a certain amount of travel?

high school amateur engineer- and first-time poster- here. I'm making a Nerf automatic springer system, and I want to model it. However, I don't know what size rack and gear system I need. I need 60 ...
Tom Foolery's user avatar
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1 answer
16 views

Can I use logarithmic decrement to get damping ratio when given data is acceleration?

Since I was going to get the damping ratio from time domain, the first thought was using logarithmic decrement method. But I'm not sure if I can use it when the given data is acceleration-time. Can I ...
KIM's user avatar
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1 vote
1 answer
16 views

Flow control valve understanding

I am trying to get a more intuitive understanding of incompressible fluid flow in valves. I understand the basics of Bernoulli's priciple and the energy involved with incompressible flows through ...
Austin Fox's user avatar
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0 answers
22 views

Constructive examples for heat transfer into pivoted components

Hello fellow engineers, i have a question for anyone who knows about the constructive elements of wind power plants. In certain wind power plants there is a rotor lockout disk (see picture), where the ...
Tybald's user avatar
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0 answers
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Flow in vent of a pipe

I have a horizontal pipe of diameter 2000mm (uniform cross section), the pressure of gas flowing in the pipe is 1.2bar and the flow velocity is 15m/sec. there is a 100mm diameter vertical vent ...
lakkadaayush's user avatar
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0 answers
12 views

Confusion in deriving von Karman equation for strip rolling

In the derivation for von Karman equation for metal strip rolling, an infinitesimal element is chosen as shown in the picture above. The equilibrium equation for the element is as follows: Upon ...
Utility ZC's user avatar
-1 votes
0 answers
28 views

How to shoot things with springs?

I am a just begining self-taught in the art of engineering and I am trying to make a thing that shoots things like a gun, but instead of a chemical reaction, I want to shoot it with something ...
Something to shoot's user avatar
-2 votes
0 answers
16 views

Anything about Linear Modules? [closed]

We produce the linear modules and we can talk any about this here. does anybody need this product?
Zoe's user avatar
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-1 votes
0 answers
19 views

High Temperature Conductive Wire (2000 degrees F)

I'm trying to find a wire that I can heat to 2000 degrees F in standard atmosphere without turning into a pile of dust. And then, once cooled to room temperature, have it carry current (24V and 1A) ...
Ted Bradford's user avatar
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0 answers
12 views

Charging a Battery Energy Storage System (BESS: 600MW/ 1200MWh) with a Higher rated Power Plant (1200MW)

A project mentions requirement of setting up a 1200MW solar power plant with atleast 600MW/1200MWh BESS system. The BESS is to be charged exclusively with solar power. My confusion is what if the ...
SankyEngg's user avatar
0 votes
1 answer
23 views

Unknown abbreviation

I am looking at P&IDs from a nuclear plant built in 1978. I have run across the letter "Y" in instrument descriptions i.e.PCT-, LCY-, FCY-, LY-, etc. Does anyone know what they ...
William Taylor's user avatar
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16 views

Inline thickness measurement by optical transmission (Beer-Lambert law)

I am wondering how effective would be an inline system for thickness measurement of diffuse plastic samples based on light attenuation. Sample thickness woud be in the order of a few mm. I know that ...
gioarma's user avatar
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Temperature profile in a pipe flow with Matlab pdepe solver

I’m currently trying to solve the heat equation for the Ohmic heating of a pipe flow using the MATLAB pdepe solver. The problem is described in the following paper: https://doi.org/10.4236/ojmsi.2021....
arnaud2547's user avatar
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2 answers
44 views

Estimating Weight of Rocks from Quarry without Weighbridge

We have this process where large rocks are broken down in crushers before clients pick them up. However, we're having trouble accurately estimating the weights of the materials coming in from the ...
Hex Heager's user avatar
-2 votes
0 answers
41 views

Do you know technology solutions to pick up and consume 1TWh energy from 100,000 solar roof installations disconnected from grid at noon hours? [closed]

Do you know technology solutions to pick up and consume 1TWh energy from 100,000 solar roof installations disconnected from the national grid at noon hours on weekends ? Join my 1TWh #PV energy for ...
a a's user avatar
  • 1
1 vote
0 answers
26 views

Cryogenic pump - why is this part slotted?

What is the purpose of that slotted area? In my opinion it is done that way in order to prevent it (the impeller) from sticking to the pump body in case it is not properly cooled down. Some people say ...
Gabriel Zitterspiller's user avatar
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0 answers
11 views

COMSOL multipysics - thermal stress for cubeSat in low earth orbit eigenvalue slover error

I'm using COMSOL version 6.2 for my simulation work. I'm dealing with Heat Transfer involving Radiation and Thermal Stress in solids phisics only after inserting all the constants and boundry ...
Abo Ayman's user avatar
0 votes
1 answer
21 views

Shaft undergoes torsion and centrifugal stress

I use this model to get the tangential and radial stress formulas but I want to examine a system also undergoes a torsion under constant speed. I'm a little confused at this point, do I need to point ...
Enes's user avatar
  • 1
2 votes
3 answers
54 views

How did mechanical punched tape readers work?

How can a purely mechanical mechanism distinguish between holes and non-holes in the tape, without deforming/ripping the paper, and then effect a larger difference depending on the sensed bit with ...
2080's user avatar
  • 111
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0 answers
7 views

Index notation for the generalized form of the velocity field dependance on shear and rotation

Good day guys, I was studying fluid dynamics and came across the following equations (shown in the image): When we have both shear and and rotation, they each contribute to the change in velocity ...
RMS's user avatar
  • 275
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0 answers
30 views

Calculating deflection of a cantilever beam using Young's modulus

I have looked at a lot of deflection questions on here and I didn't see anything that quite matched what I needed to know. I am working through some curriculum for students and I am working through ...
Jesse's user avatar
  • 101
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0 answers
32 views

Resistance of a pressure sensor from Wheatstone bridge

How do you get the resistance value from a calibrated Wheatstone bridge circuit? I want to build a Wheatstone bridge to get the resistance of a pressure sensor. The unknown resistance in the ...
Acrobatic-Ad-168's user avatar
0 votes
0 answers
23 views

Some questions at interpreting FRF from vibration test

Currently going through impact hammer test of cantilever beam(200mmx20mmx2mm) which is made of particulate composite(Epoxy/PZT/CB). Hammer sensitivity is 2.25mV/N and accelerometer sensitivity is ...
KIM's user avatar
  • 1
0 votes
1 answer
17 views

Characteristic scales in Thin Shear Layers Equations (Aerodynamics)

I am struggling to understand what characteristic scales mean in the context of thin shear layer equations. I am referring mostly to the following paragraph from the book "Turbulent Shear Layers ...
Bogdan's user avatar
  • 3
0 votes
0 answers
17 views

H-Bot Pulley Assembly - 'Normalizing' Diagonal Movement Speed

Given a traditional H-Bot pulley assembly with 2 stepper motors, how would I calculate the RPM's needed to limit diagonal movement speed to that of comparable horizontal/vertical speed? Would I simply ...
jcm999's user avatar
  • 1
2 votes
1 answer
125 views
+50

Push-to-lock & a button pressing mechanism to release

I need a secure attachment mechanism for a robot arm tool changer that can snap one part into place by pushing it in and release it by pressing a button. This mechanism must reliably handle around 25 ...
John Doe's user avatar
0 votes
1 answer
38 views

How powerful would a laser need to be to melt through an iron girder from a distance of ~260m?

Merely a curious fool contemplating how plausible it would be to cut the Eiffel Tower in half with a massive laser (you know, for fun). What kind of laser would it take to cut an iron girder from ...
Ariadne's user avatar
0 votes
0 answers
11 views

Why does a Laser Welder or Cutter require different coolant temperatures for the Laser Source and Optics?

I recently purchased a laser welder and found that the chiller has two temperature set-points; one for the optics and one for the laser source. Any ideas on why this is the case? To me it seems that ...
ericnutsch's user avatar
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0 votes
0 answers
35 views

How to calculate the material and thickness I need for a certain force on it?

I am trying to figure out how to design how thick a material has to be so that the bar shown in picture 1 stays intact when a user is running on it. Background: The project is a treadmill and the user ...
Bob Valencia's user avatar
1 vote
1 answer
37 views

Converting string vibration to electricity

Is there a device that can use the energy from a vibrating string (i.e. guitar string, etc.) to produce enough electricity to power a small LED?
Matthias's user avatar
1 vote
0 answers
101 views
+50

Mechanical mechanism to store and update state of fixed state transition table

Given a state transition table like this: 1->3 2->1 3->4 4->2 (If the system is in state 1, next change to state 3 etc.) In my actual use case there ...
2080's user avatar
  • 111
1 vote
1 answer
53 views

Can I perform a hard reset of a USB flash drive?

I don't typically post to engineering but I need help with a USB drive. First off, I have a USB, a Sahara 128mb, that once became unusable on windows machines, and I thought it was dead. Yet I kept it ...
Phume's user avatar
  • 11
1 vote
0 answers
20 views

If building a DIY screw jack, would it be beneficial to add a gimbal to the jack nut, and/or to the screw attachment?

The screw jack will be used twice daily. It will be made out of M24 8.8 grade threaded rod and nut. The nut will travel 300mm, to raise a weight of 50kg by 800m, via a pivoting lever arm. The parts ...
Russel Walker's user avatar
-2 votes
0 answers
27 views

Solving Water Demand: Utilizing a New Calculator for Average Domestic Demand Given Total Storage Capacity

I recently found a calculator that helps determine the average domestic water demand given the total storage capacity of a system. I believe this tool could be beneficial for civil engineers working ...
ANKUSH SHIVHARE's user avatar
0 votes
1 answer
76 views

Are Apple Airpods capable of producing 165 decibels of sound?

Inspired by this article, where a Texas family claim that an "Amber Alert" on their son's Airpods caused his eardrum to rupture. https://www.dailymail.co.uk/news/article-10830803/Boy-...
user47776's user avatar
0 votes
1 answer
14 views

Can I increase the field of view of a lens+camera system by placing a meniscus lens in front of it?

Let's say I have a camera + lens system. The lens is a standard focal length, let's say 25 mm on a 1/2" sensor, so not wide angle. Instead of mounting a wide angle lens on the camera, would it be ...
gioarma's user avatar
  • 103
1 vote
2 answers
58 views

How do lifts remain steady as passengers embark/disembark?

I'm referring to the kind of lift that takes people up and down floors. I notice lifts are very stable as people get on or off. Since the lift is presumably stationary because the tension in the cords ...
Allure's user avatar
  • 145
0 votes
0 answers
5 views

Help Needed: Looking for Sample Phase Change Material (PCM) Calculations

I am working on implementing a Phase Change Material (PCM) system for a cold storage facility. While I'm familiar with traditional refrigeration systems, I'm relatively new to PCM technology and would ...
Neo Mech Eng's user avatar
1 vote
1 answer
30 views

Conductive Materials

When one measures the resistance of a highly conductive material, like graphite (I am not sure how conductive it is actually - in comparison to other conductive materials); would it matter what is the ...
Acrobatic-Ad-168's user avatar
1 vote
0 answers
23 views

Parameters to characterize heat dispersion

I'm working in a team to model some production machinery in a factory. They ask me to find a way to describe and quantify the heat loss to be able to make an initial and approximate comparison between ...
M4rc0txt's user avatar
0 votes
1 answer
49 views

Wind Pressure on Chimney

I have this question that I am trying to solve. I cannot put diagram up to show problem because it is over file size limit of 2 MegaBytes, but I will explain problem as best as I can. A brick chimney ...
Rob Wilkinson's user avatar
0 votes
0 answers
11 views

What are the advantages of using partial pivoting in Gaussian elimination compared to rounding off in solving systems of equations?

What's the advantage of using partial pivoting (alternative Gaussian elimination)? In this case, I can use it because if I approximate the result x2 to 1, I'll get strange solutions... But... what's ...
Gjhdby5 Vjfhu's user avatar
0 votes
0 answers
17 views

What components to use to build rocking bench?

I want to build a bench that a user would lie face down on, like a weights bench, however this bench should be able to rock to each side around 30degrees. So I need the bench top to sit on some kind ...
Andy S's user avatar
  • 1
0 votes
0 answers
26 views

What would be a good way to connect parts that would be replaced on a training model?

I'm trying to work on a training model for neurosurgery. Residents will be operating on the posterior part of the model, and it needs to be replaced after each training session. While the anterior ...
Bilal Bahadır Akbulut's user avatar
0 votes
0 answers
11 views

Calibrating the commercial bar-type load cell for measuring weight at tilt

The commercial hobbyist bar-type load cell you buy at ebay for about 3 dollars or so has 4 strain gauges (two at the top and two at the bottom) for measuring weight that is perpendicular to the load ...
DailyReader's user avatar

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