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10 views

Is there a standardized file format for parametrised solid modelling?

Is there a standardized file format for parametrised solid modelling? I am familiar with STEP and IGES file formats for saving solid models, but AFAIK they don’t store information regarding parameters,...
0
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1answer
21 views

Wall Humidity Condensation

Imagine you are in the mountains and it is very cold. The walls are colder than the air, so air close to the wall will lose heat to the wall, and by losing heat it might lose its humidity (water ...
0
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0answers
34 views

Motor shaft mounting with clamps and bushings

If I'm in the wrong section of stack exchange, please help me go to the right place. I am trying to find out if this combination of motor shaft and clamps will work out. I found these clamps/...
0
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0answers
5 views

Assign a name to surface in CAD STEP file

I have a CAD model designed in FreeCAD and need to export it to a STEP file (neutral CAD format) to be used in numerical anaysis software. I would like to assign names to selected surfaces in order to ...
0
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0answers
10 views

Why does my DaVinci IQ vaporizer often boot up to a “frozen” state?

I have a "DaVinci IQ" vaporizer. Although it normally works, it has happened multiple times now that I start it as normal (clicking five times on the main button) and it just shows the "battery mode" ...
0
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0answers
21 views

By approximately what ratio does power steering (on a car) amplify the torque applied?

Power steering on a car is a form of torque amplifier: the driver applies X Nm (or ftLb) of torque, and the power steering adds Y torque - but maintaining the same angle of turn. But what's the ...
0
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1answer
30 views

Do kids under a certain age not hear the warning beeps that smoke detectors make when they are running out of battery power?

I've always been very annoyed by those regular single beeps that smoke detectors start doing increasingly often as the batteries start to run out, to warn the user to replace the batteries. Lately, I'...
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0answers
8 views

gas regulator exhaust gas during diaphragm adjustment?

On my air tool compressor or scuba gear you can see or hear a diaphragm regulator sloughing off a tiny amount of gas to the atmosphere when you adjust the regulator down. Does a natural gas regulator ...
0
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0answers
9 views

Determining work envelope of spherical parallel manipulator?

I am designing a spherical parallel manipulator. I require a work envelope that is a cone, with 360° of full rotation and an opening of 90°. I am attempting to calculate using this work envelope what ...
0
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1answer
40 views

Stopping force on wire rope from a falling object

Okay, bit of a weird one. Imagine an object of known mass in free fall, tethered by a wire rope to an infinitely stiff sky hook. When that wire rope eventually tightens, what will be the stopping ...
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0answers
19 views

Repeating linear motion to extend/retract

I'm trying to figure out a way to have a repeating linear motion to extend/retract a yoke/piston. Something like a ratcheting rack actuating a scotish yoke. So sliding the rack one length would rotate ...
0
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0answers
22 views

What purpose do the “angled tabs” on a PCIe bracket serve?

In the PCIe specification (see page 75), the "short arm" of the bracket has two cutouts; one for the slot that the retaining screw fits in, and another square cutout that has additionally had the ...
-1
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1answer
12 views

Nyquist stability criterion for positive feedback

it is known that the stability of a system with negative feedback may be analized through the Nyquist stability criterion, which is based on observing the number of turns around the point (-1;0) in ...
1
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1answer
17 views

Designing RLC circuits at specific frequencies for teaching use

I need help designing simple circuits that resonate around specific frequencies. Basically I am looking for recommendations as to what size capacitor, inductor, and resistors I should get. Sorry if ...
1
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2answers
35 views

Calculating the torque required to move and hold an arm parallel to the floor

I'm a computer scientist doing a dissertation in robotics and I'm designing a mechanical arm that mirrors a humans, as such I am wanting to pivot the entire arm from a "shoulder" using a stepper motor ...
0
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1answer
12 views

Joining the negative PV wires of 3 solar arrays for 3 MPPT controllers in an inverter?

My Inverter has 3 MPPT inputs. For some design simplifications (Involving ATS), i would like the three arrays to have separate PV+ but join the PV- wires together at a bus-bar and take the Inverter ...
-1
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1answer
23 views

Elastic waves in very thin plate

Elastic waves in structural elements are described by \begin{align} \rho \frac{\partial^2 u}{\partial t^2} &= (2 \mu + \lambda) \frac{\partial^2 u}{\partial x^2} + \mu \left( \frac{\partial^2 ...
2
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1answer
35 views

Torque between concentric gears

First time asking question here. I'm not a mechanical engineer! I have a simple question that I can't explain the answer to it. I have a double gear (2 concentric gears with different radius) and I ...
1
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0answers
30 views
+50

How do I add unmodeled dynamics to the system?

I am considering the following paper: Stability‐and performance‐robustness tradeoffs: MIMO mixed‐µ vs complex‐µ design and I am having troubles understanding how to handle the unmodeled dynamics of ...
0
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0answers
13 views

Determine gas orifice size based on factory sea level orifice (range oven)

I have a natural gas unit that is being used at a non sea level application. It comes with #36 orifice size, and gas is at 5"WC. With that information, how would one determine the proper orifice size ...
1
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1answer
26 views

The best foundation type?

What are the best foundation type for a construction in the city and earthquake prone area? If bored pile foundation is the best, which type is the best, square, circle? what are the considerations of ...
0
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0answers
10 views

Assigning different thicknesses to single part - ABAQUS

I am trying to validate the results of linear analysis from RSTAB (structural analysis tool) with ABAQUS. The model comprises of approximately 800 members. Each member is composed of built-up sections ...
3
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1answer
87 views
+50

Calculation of the stored energy for a heat storage tank

There is a heat storage tank that is directly loaded from the top and the heat is also taken from the top. The colder water from the heating circuit return flow enters the heat storage tank at the ...
0
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1answer
22 views

Nickel Chromium Wire for high temperatures

I've been trying for months to find a way to heat moving air inside a tube to high temperatures. The closest to success I ever had was using an element from a heat gun. It would achieve the desired ...
0
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1answer
13 views

Simple negative ion detector circuit?

There are the "consumer" negative ion detectors which are about 50 USD, reviews appear to indicate that they are not measuring very much at all. Then there are the professional ones which are $800 ...
1
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0answers
15 views

Oil pressure inside copper tube?

**Background ** I'm struggling finding how to calculate the pressure that occurs within my system and then once calculated I need to reduce that pressure. My system I have a 1 inch copper pipe ...
1
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0answers
16 views

Differentiating between Two Orthographic Projections

I came across the infamous control handle assembly in two different books, referencing the views differently. One of the had it like the following photo The other book labelled the side view in this ...
1
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3answers
35 views

what to learn to design mechatronics device that move [closed]

I want to design an artificial leg for disabled people. The idea is design of a Device for patients with problems on one side of the leg from the knee down. This device first detects intent to move ...
1
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1answer
37 views

Raised plywood false floor for heavy equipment usages

I have a electronics assembly company, and we run two assembly lines. They consist of several machines, with the heaviest being around 4000lbs, on 6 metal casters. We currently have the line on a ...
1
vote
2answers
23 views

Deflection and stress in a freely rotating beam

How do I calculate the deflection and stress of a beam that is rotating freely (for example in space) when a moment is being applied to it, for example by rocket motors at the ends of the beam?
1
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1answer
15 views

For arc-length method in nastran, how to analyse post-buckling behaviour with load decrease

I am currently trying to model the buckling behaviour of a cylinder using sol 400 nonlinear static analysis using Nastran. I am using the arc-length (modified Riks) method as apparently it can ...
-1
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0answers
23 views

How to calculate the thickness and arrangement reinforcement bar? [closed]

A concrete culvert (inner size: 3.0 m ✕ 3.0 m) shown in the figure on the right side is planned to be embedded in soft sandy soils 2.0 m beneath the surface of a road. Calculate and determine and the ...
-1
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0answers
14 views

What kind of surveys and tests necessary? [closed]

A transformer (weight 200 ton, contact area on the ground 8 m ✕ 5 m, height 4 m) is planned to be installed on the flat ground of soft cohesive soils. Answer the following questions for the sake of ...
-1
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0answers
14 views

How to calculate the flow rate?

The water is flowing in a wide rectangle section shown as following figure. Given: the width of B = 20 m and the water depth of h = 1 m, calculate the flow rate. Assuming: the roughness coefficient ...
-1
votes
1answer
31 views

Aerodynamics - How can you solve for mass when velocity & chord are not given?

My prof is the type who makes up his own questions (rather than pulling them from textbooks). This is his latest work... Anyone got any ideas on how to solve this? He assures me that you don't need ...
1
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0answers
26 views

How can I find the length of 12 gauge wire needed for a cone of if I know it's surface area

So I'm working on a personal project, and I need to figure out how much 12 gauge wire (which is ~2mm thick) I would need to cover a cone shaped rubber core, which has a surface area of roughly 3,417,...
1
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0answers
11 views

(Mechanics/Electronics) Anybody know DTC code for asking Air flow measurement on OBD2?

(Sorry if there's a better place for this. It's my first question) I'm doing a final work for a Bachelor in Electronics and my work consists in making a fuel meter for a car. Its connected via OBD2 ...
1
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0answers
17 views

Moisture sensor for Mixers

I'm looking for alternatives to measure the moisture content in a concrete mixer machine. The ones on the market are expensive, like Hidro-Mix for apparent reasons; mixers are a hostile environment ...
0
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0answers
18 views

Autocad start drawing away from the Z=0 (non-coplanar)

I'm having an issue when I draw some elements. They are been drawn away from the Z=0, is causing to be non-coplanar with other elements. So, I cannot make fillets or can find crossing points. I don't ...
1
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1answer
28 views

Are ceramic materials suitable for making locking lugs for guns?

Since ceramics are resilient to shear loads, could one make locking lugs in a gun out of them or will tensile loads also be present leading to failure of such lugs? Also, could those tensile loads be ...
-1
votes
1answer
14 views

how can I solve this error in c++: Exception Unhandled? [closed]

I am new in learning C++. I have used this code to show an image, but there is an error that I do not understand! This is the simple code: include iostream include conio.h include opencv2/core....
3
votes
1answer
30 views

Question about flow temperature and storage temperature in a cogeneration plant

Let's assume I have a cogeneration plant that produces heat with a nominal output. The heat is given into a heat storage tank, which is filled from above. The maximum flow temperature of the ...
1
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0answers
21 views

Is it possible to have the load cell signal as feedback to the servo drive of the servo motor?

In my project, I have to control the linear motion in one of the two modes. It will be either in position control or load control. for the displacement control, The servo motor takes the quadrature ...
0
votes
0answers
49 views

First millennium BC Egyptian rudder systems

Hello I am researching first millennium BC Nile freighter rudders. They sailed upstream and came back down with the current. The Greek writer Herodotus tells us that going downstream they were towed ...
-1
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0answers
14 views

Finding exit velocity from a compressed CO2 canister

I’m trying to find P3 and v3 (exit velocity and pressure) to plug into a CFD simulation, but I’m having trouble finding v2 and P2 (velocity and pressure before the valve). I’ve looked online and many ...
-1
votes
2answers
30 views

Where can I find a list of building codes to put on a set of blueprints for a addition

Most architectural companies have a template of blueprints they reuse for every project. As an owner-builder, I need to make these blueprints from scratch On page 1, I have to list all applicable ...
-1
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0answers
18 views

Linear Motion Ratio on Eccentric Cam Pulley

If you have an eccentric pulley wheel and attach a rope to the top most vertical position and pull downward, the point at which the rope is fastened inscribes a circle with the radius of the distance ...
-1
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0answers
17 views

Calculating flow rate of compressed air to push another liquid out of a tank at a desired flow rate

I am working on a system for a university project which uses pressurised air to eject the contents of a tank through a pipe into the atmosphere. I am working on figuring out the flow rate and pressure ...
1
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1answer
21 views

Bendable flaps on sheet metal

I'm trying to cut some bendable flaps on aluminium sheets for hooking/clipping onto some fabric. The flaps I have in mind look like this: Are these common features? Does anyone know the geometry of ...
2
votes
1answer
22 views

Drained and undrained shear strength of clay correlated?

When we measure the undrained strength of clay via CPT or triaxial test for instance, is there a way to correlate this to drained strength? How? I ask because measuring drained strength takes very ...

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