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FEA meshing of irregular geometry

I work on the simulation of sand particles and usually use tetrahedral free-meshing to represent their complex geometries for finite element analysis. I have recently spent some time looking into ...
Jacob Wilson's user avatar
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0 answers
9 views

Helicoil-Screw Torque Spec

My project incorporates the use of various metals and plastics to include ABS, G10, aluminum, titanium, and brass, and we drill and helicoil all mounting screw holes. I'm having a bit of difficulty ...
Jedi Engineer's user avatar
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0 answers
10 views

Velocity value in a pipe junction when we're applying the energy equation

I'm trying to understand how to apply the energy equation at a junction of 3 pipes. For example, when we are considering points A and D, should we consider that velocity at point D just before the ...
Simion I.'s user avatar
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0 answers
29 views

Kindly explain this graph which is related to internal combustion engines

Hello, I am not getting this graph which is related to the Internal Combustion Engine.
ABDUL SABOOR KHAN's user avatar
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0 answers
36 views

Can the volume of fluid flow affect a strain gauge's measurement accuracy?

I have two machines for testing solenoids, one new and one old. When a bypass is connected to both hoses (the input hose is connected to the output hose), I get ~1:1 for the input output pressure; the ...
ninjaboy667's user avatar
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0 answers
10 views

Complete classification of lower kinematic pairs

During research I keep seeing the statement saying that all possible lower kinematic pairs can be classified into one of 6 types, those being: Revolute Prismatic Screw Cylindric Spheric Planar While ...
Jakob 's user avatar
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1 answer
35 views

How do I perform a lead of helix cut?

In this old blueprint from 1944, it calls for a lead of helix, 1 turn in .2" on red arrow: No other info is provided. This is a top view of the part. Here's ...
user5507535's user avatar
2 votes
1 answer
149 views

How do I relate tongue weight to weight x distance?

The specification for car hitches routinely state the tongue weight, but do not specify how far that weight can/should be applied. What am I missing? Shouldn't the maximum bending moment be the one to ...
Sam7919's user avatar
  • 411
2 votes
0 answers
35 views

Are two solars panels more efficient than only one of twice the power output?

Is there any advantage to use two 50 W solar panels in parallels instead of one 100 W panel? As we know, the effect of partial shadow on a solar panel can make the whole panel ineffective. We want to ...
Charles's user avatar
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0 votes
1 answer
34 views

Do cheap, low pressure (~0.25psi) pneumatic components exist?

I am working a design project (a bubble CPAP machine) for one of my classes and though the device is pretty simple, finding components for it is a nightmare. Essentially, a pump feeds air through a ...
user62783's user avatar
0 votes
1 answer
23 views

Deformation Due to Material Removal and Residual Stress

Suppose I have a piece of metal (of arbitrary geometry) with some residual stress profile. I then remove a chunk of the metal and the piece of metal deforms (due to the residual stress). For ...
yl0l's user avatar
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Checking if a Residual Stress Field Achieves Mechanical Equilibrium

Suppose I told you the Cauchy Stress Tensor at every point inside a chunk of metal. And, yes, I know this means that I would need to tell you about an infinite number of points - let's ignore that ...
yl0l's user avatar
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0 answers
11 views

Shaft Nominal Diameter for M16 thread

I am looking to machine a M16 thread with a pitch of 2mm on a shaft, but I am unsure about what diameter should that shaft be in order to achieve the desired M16 thread. Does this change depending on ...
Marco Luís's user avatar
-1 votes
0 answers
23 views

Steam turbine powered by hydrogen movement

Steam turbines already exist that generate power from the heat generated by the combustion of gases. Gas turbines and combustion engines also exist that can generate electricity from the combustion of ...
Anon's user avatar
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0 votes
0 answers
27 views

Are double universal (Cardan) joints exactly constant velocity?

Some double universal joints use a centering joint to ensure that the angle of the input and output are equal to maintain a constant velocity through the joint. From what I can tell, this centering ...
Ryan's user avatar
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0 answers
22 views

List of engineering jobs where particular attention to heat and heat hazards need to be kept in mind [closed]

I was wondering whether anyone can give me a complete list of jobs, whereby, people would be working, near, things, with extreme heat conditions, or next to things having extreme heat conditions. Here ...
Joselin Jocklingson's user avatar
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0 answers
19 views

Creating a Multi-SIM Cellular Connectivity Solution for Raspberry Pi Zero 2 W

I'm looking to set up my Raspberry Pi Zero 2 W so it can use various SIM cards from different telecom providers. While this might sound unusual, it's actually quite practical. In some areas, certain ...
Jay Gatsby's user avatar
0 votes
1 answer
28 views

What's the best way to mount many clock hands on a custom clock?

I'm building a custom clock that requires 4-5 clock hands that need to move individually. I've designed it so the hand are to be mounted on telescoping brass axles (that have press fit gears ...
James's user avatar
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0 answers
8 views

Is there a formula to calculate the dynamic factor Kv for a single stage helical gear set?

I want to optimise my gearbox for dynamic factor Kv=< 1.1 Is there any equation to do so in excel from the power input, the macro geometry, etc.?
Gui's user avatar
  • 1
1 vote
2 answers
42 views

Division symbol in welding proceedure

I am dealing with a European contractor, and often I see a division symbol (÷) in their documents, screenshot below. Could somebody explain what that means? P.S. Hope this is the right stack for it. ...
Jek's user avatar
  • 13
0 votes
2 answers
60 views

Connect two motors to different planes and rotate them on the same center point

I am trying to design a kinetic art sculpture. I want to rotate two independent planes at the same center point and control both their speed and direction independently. So I've found that having two ...
Harmeet Singh's user avatar
1 vote
0 answers
39 views

How to calculate Power Factor capacitors for welder

I have a 200 Amp AC welder and I am trying to figure out what the power factor correction capacitor should be. I ran some numbers but they do not sound right and I was wondering if I anybody could ...
user1683793's user avatar
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1 vote
1 answer
22 views

Pumping water from under concrete slab basement

I have this situation, and wanted someone's opinion. Info: Concrete foundation basement, slab floor Weeping tiles and a sump pump is present / operational The house is near a pond. Grading is alright,...
CrazyFox01's user avatar
0 votes
1 answer
41 views

Profile and pressure angle definition in gear geometry

In gear geometry there are 3 main angles, which can be misleading: Profile angle Pressure angle Operating pressure angle Further for simplicity I would restrict the area of interest to "spur ...
Richard's user avatar
0 votes
1 answer
42 views

One way bearings

I want to use one way bearings for a project, but there are some things I just can't figure out about them. So I know that a one way bearing restricts rotation of an axle in one way and allows ...
Jelle Lansbergen's user avatar
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0 answers
26 views

6” hole in basement slab near fundation wall

Is it okay to drill 6” hole in basement slab 4-6” from the wall? Will I hit footing and is that an issue?
Maxior's user avatar
  • 1
0 votes
0 answers
47 views

The triangle of forces - Lami's rule

Hello there, In this question, I have to draw the shape so that I can solve the problem. I looked at the answer book and did not understand how to draw it. Can someone help me? Note that the answer is ...
Youssef Soliman's user avatar
0 votes
0 answers
19 views

Are "Tresca yield surface" a type of failure mechanism?

A non-rigid solid was given a x-direction point load, and von Mises yield criterion is used to check whether the solid would fail or not. I was also asked: "(the previous question asks us to ...
Faito Dayo's user avatar
1 vote
3 answers
56 views

Self Locking Brake Question

I've been staring at this problem for statics for quite a while now and I just don't understand it. The question states: "The brake is to be designed to be self locking, that is, it will not ...
Bob Flinn's user avatar
0 votes
0 answers
8 views

Maximizing Energy Efficiency : A Comprehensive Fluent Simulation Study for Optimizing Foster Wheeler ESD Boilers (I-IV) - A B.Sc. Thesis Proposal

How can Fluent simulation software be effectively utilized in optimizing the Foster Wheeler ESD boiler for my B.Sc. thesis proposal, and what simulation parameters and methodologies are recommended ...
Zain Ul Abedin's user avatar
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0 answers
9 views

Justification for choice of beam stiffness at pinned far-end member

I’m reading off an example provided by the ICE structural analysis book, specifically example 4.7 (moment distribution method) I dont seem to understand why the stiffness from member D-C is 4EI/L ...
EduartR's user avatar
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0 answers
23 views

How to determine minimum and maximum value of lateral displacement in Railway Equivalent Conicity Calculation

I am trying to calculate the Equivalent Conicity for railway application by referring to ...
you_know_who's user avatar
-2 votes
0 answers
26 views

get the side view shape and the isometric view [closed]

get the side view shape and the isometric view from the plan shape and elevation
mohamed wahid's user avatar
0 votes
0 answers
11 views

How to add compressor curve in Aspen HYSYS for a centrifugal compressor with IGV and only one efficiecy 65% is given in data sheet at 400rpm

I am trying to check the adequacy of existing centrifugal compressors in a gas train. The adequacy check is required due to a new tie-in in an existing gas train inlet, from a new source of "...
Ahsan Usman Rashid's user avatar
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0 answers
15 views

Controls architecture for stepper drivers

I am working on a project which deals with a large number of stepper motors and other devices. A key feature I want to achieve is create a modular/ expandable system, so that new devices can be easily ...
rob's user avatar
  • 1
0 votes
0 answers
10 views

Inductor calculations helper script and motor idea

I have an idea for a motor involving the use of a flyback transformer to recycle EMF in a custom designed pole-to-pole repulsion-attraction DC motor. I wrote a script to help with setting design ...
Instrumentation-Tech's user avatar
-1 votes
0 answers
49 views

What jet aircraft has the longest flight range? [closed]

What jet airplane has the longest flight range (without aerial refueling)? There are four categories: Special aircraft (e.g. experimental jets or unique airplanes (like the giant Antonov An-225 which ...
Triceratops's user avatar
-3 votes
0 answers
24 views

material strength, [closed]

a hard steel cone having a semi angle of 82 degrees is drawn across the surface of a hard steel plate, having a hardness of 2000 MPa under a constant normal load of 120 N. Estimate the width of the ...
aswin's user avatar
  • 1
1 vote
1 answer
79 views

Benefits of a steel ball in janka hardness test

The Janka hardness test is a test used to measure wood's resistance to denting. The test involves pressing a steel ball that is 0.444" in diameter halfway into a piece of wood and measuring the ...
jesse_b's user avatar
  • 317
0 votes
1 answer
24 views

In a lead screw mechanism with a fixed travelling nut, will the screw and its driving mechanism move instead?

https://www.youtube.com/shorts/tUkkOStjz8o Imagine this but upside down. Since the platform bolted to the travelling nuts will be pressed against the ground and will have nowhere to go, I reckon the ...
Ojasvi Srivastava's user avatar
-4 votes
0 answers
16 views

How do you ensure controls are put into place once a product is no longer a prototype [closed]

What will be the best way to ensure that controls are put into place once the product prototype has been approved.
Nadia's user avatar
  • 1
0 votes
0 answers
18 views

Impact on high frequency radial forces on ball bearings

Dear Stackexchange forum, Do high frequency radial forces (e.g. 6kHz) do significantly increase wear and reduce the life span of ball bearings? I am looking for an expert in ball bearing research ...
MikeK's user avatar
  • 1
0 votes
0 answers
12 views

A transfer function relating jet engine thrust to pitch angle during a phugoid motion

I am doing a school project that requires me to find a transfer function that relates the thrust of a jet engine (which could change with time in one way or another) and the aircraft's pitch angle ...
Faito Dayo's user avatar
0 votes
1 answer
48 views

What is this kind of drill-bit-like tool called?

I've seen a video with a tool I had never seen before but in the mean time this video has been removed, So I will try to describe instead: The general machine is a kind of CNC saw. It looks like a ...
Camion's user avatar
  • 127
-1 votes
2 answers
35 views

So even though the raw materials of semiconductors are cheap why is their cost so high and why don't we use conductor for the same job?

The materials used in making semiconductor are cheap and readily available then does the cost of processors so high can't we use metals like copper and iron which very good conductor for manufacturing ...
Sidheswara Sahoo's user avatar
0 votes
1 answer
8 views

Two-Ray Ground-Reflection Model: Understanding the Difference in Phase Offsets at the Receiver

Currently, I'm trying to understand the Two-Ray Ground-Reflection Model. During my research, I came across the following simplification expressing the received power as follows (taken from Wikipedia): ...
Henerii's user avatar
-1 votes
2 answers
61 views

Will a lid hovering above bursting air bubbles catch smog particles

The bubble bursting phenomenon goes like the above describes: At 1, the air bubble is under water. At 2, the bubble emerges above the surface, with a thin film of water rising to keep it from bursting....
El Flea's user avatar
  • 98
0 votes
3 answers
39 views

How to design safely collapsing buildings?

Background—Currently, buildings seem to be designed to be strong enough to not fall upon dangerous events, such as earthquakes. This makes them expensive, and out of the reach of poor places. Poor ...
caveman's user avatar
  • 117
0 votes
0 answers
27 views

Does anyone manufacture 1/4-28 STI hex cap bolts?

At our shop, we make parts with 1/4-28 STI threads that will later accept a helical insert. The threads are cut on the first side and then used to bolt down to the pallet to run the second side. We ...
Woody's user avatar
  • 21
0 votes
1 answer
31 views

Continuous swinging machine

I'm making art piece that is hanging from roof and I would like to have it in continuous swinging motion. What kind of mechanism could be used in this case? info about the art piece about 16kg shape ...
tihnik's user avatar
  • 1

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