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23 views

What should be the material and thickness of front pillars to stop car (~1,847kg and ~262 km/h) without killing the driver?

"Tesla Model 3 owner died in a tragic accident with a semi truck. The Model 3 went under the truck’s trailer resulting “in the roof being sheared off as it passed underneath,” which is known as a “...
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0answers
27 views

Nickel prices are skyrocketing, why?

Since the start of Juli the Nickel (Ni) prices are skyrocketing, can anyone explain why?
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0answers
7 views

The steps in photogrammetry pipeline

I am interested in photogrammetry and wanted to see if I had a good overview of the steps of the photogrammetry pipeline and can anyone help me expand on these steps, provide resources on how they are ...
0
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1answer
19 views

How to reinforce concrete over a circular span

Last year we poured a RC suspended slab according to designs of a structural engineer. (Note we are just DIY home builders but have taken professional advice throughout.) The slab was cast with three ...
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0answers
11 views

Wave train 200 m/s meaning

I ran a 60 m seismic line. Energization with hammer. 12 (10 hz vertical 5 m spaced) geophones and 5 shots (15 m spaced). Record length 0.5 s. Thanks to a borehole near a estrata of gravelly silt man-...
3
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0answers
15 views

Will a cyclic heat load transform my martensitic steel? How fast?

I have a plunger - that I'm using for glass forming - made out of a martensitic steel. Glass is at 1000°C and since martensite is a metastable phase, should I expect the properties of my plunger to ...
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0answers
5 views

What version of ANSYS is useful for simulation flow in a fin heat sink?

I'm interested in learning flow simulation in ANSYS and have found several tutorials. However, none say which version of ANSYS to download. The options are "Discovery Live Student", "Discovery AIM ...
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1answer
8 views

Emulate impact forces using pneumatic piston

I am trying to test a piece of furniture based on a particular code, the code states that i can either drop a bag (with a specific shape) of 57 kg 1.2 in above the seat or I can use other methods as ...
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0answers
21 views

How are the modern hydraulic cylinders very precisely controlled?

My guess is that they use brushless Motors that in turn powers the hydraulic pump. But there must be some kind of valve that could help in the process. Still the burning question is just by adjusting ...
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0answers
12 views

Lifting a Conveyor unit in an onion harvester

How to lift a digging and conveying unit of an onion harvester. The conveyor is attached to digging blade and is located at the center of the onion harvester tractor. It should not crash with ground ...
1
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1answer
21 views

Dependency between load capacity for reinforced concrete slab and thickness

How does the load capacity for a reinforced concrete slab depend on the thickness of the slab? Example: Let's suppose that we have the following constants: concrete quality (including the maximum ...
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0answers
27 views

How to choose the right gear ratio?

Let's say we have a system of gears. There is one in the middle, and it is surrounded by 4 other gears in order to rotate around an axis. There is no any kind of speed limit,etc. In this case which ...
1
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2answers
26 views

Parallel Axis Theorem for x and y Shift

I have a quick question about the parallel axis theorem. Let's say I have a box-like object rotated about the following pivot point I was wondering, by applying the parallel axis theorem, would the ...
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2answers
36 views

Why not a reverse bending in the slab?

When I'm looking at images / videos about the load supported by reinforced concrete slabs, I always see a compression at the top of the slab in every point that varies from the center to the edges: ...
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0answers
8 views

motion gesture and axis definition

I read something about defining hand gesture, which include mid-air hand gesture (e.g a peace sign with the two fingers moving one after another), touch-based gesture (e.g. on touch screen), and ...
0
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1answer
47 views

Why Nazi UFOs in WW2 never took off; why can't we still make an UFO flying vehicle? [on hold]

Is it possible to fly a UFO shaped vessel using thrust created by Coanda effect.
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1answer
41 views

Reinforced mesh at different distance in a concrete slab?

Trying to determine some information regarding the reinforced concrete slabs (reinforced with mesh) in an apartment, by looking through the holes in the middle of the rooms for lights, I've come ...
2
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0answers
17 views

Meaning of energy method in control theory

What qualifies a energy method in the context of control theory? Citing from a paper to give the context in which this expression came to my attention: One of the challenging problems of the double ...
1
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0answers
33 views

Crooked floor, but ceiling with no incline - could it possibly be a screed?

This question is related to the situation in an apartment in a reinforced concrete building that is approximately 30 years old. The ceiling is almost perfectly straight and level. However, the floor ...
2
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1answer
24 views

What is wrong with my ALU hdl code?

(nand2tetris course) Expected result: ...
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0answers
18 views

Estimating rate of drying by comparing identical process with different ambient humidity

We have a drying process where we take a thin bread product and cool it in a room at 11 C and 90% relative humidity. The product comes in at 80 C and comes out at 22 C. There is air blowing across the ...
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0answers
14 views

1) how to calculate the thickness of pressure vessel with eliptical cross section for certain amount of pressure

How to calculate the thickness of pressure vessel with eliptical cross section for certain amount of pressure Also how to find the same, if cross section is variable elipse (converging elipse)
1
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1answer
34 views

Could boiling water inside a semi-enclosed pipe be a low-cost method for a silent marine propulsion system? (redesigned)

I am wondering if boiling water that is trapped inside of a semi-enclosed pipe would be a low-cost method of creating an underwater thruster that would function as a silent marine propulsion system. ...
0
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0answers
22 views

How can i transmit video feed along with control signals in my wireless CCTV system? [on hold]

I am trying to build a wireless CCTV camera system. I want to use only one camera, with a live feed and camera must be rotatable. I intend to use an Android application on my tablet to view the video ...
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0answers
17 views

Calculation of reference vehicle speed using wheel speed sensors and longitudinal acceleration

I am curious why the speedometer in most passenger cars almost always uses the highest wheel speed, even if the rest of the wheels are stationary. Is this intended to be a safety feature of some sort? ...
0
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0answers
20 views

Want to modify my chainsaw, what things are most likely to break (or what things should I stick with first?) [on hold]

I'm very new to saws/2-strokes but have learned a ton and overhauled a few saws now, dissembled my new climbing saw, am wanting to eventually have all my saws performing as powerfully as possible (w/o ...
1
vote
1answer
32 views

Laminar flow hood/air straightener

I was looking at laminar flow filters to aid in my mycology work I'm doing. Most filters use an aluminum extrusion with fins. I figured the options out there are pretty expensive for what you get and ...
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0answers
3 views

Where to find spectral details like wavelength for hyperspectral GeoTIFF files?

I agree that GeoTIFF format doesn't store wavelength information. But for hyperspectral images spectral wavelength is important to know. I got to know that the GeoTiff files store these information in ...
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3answers
43 views

Steam cycle for a boiler / radiator system vs Rankine cycle

Everything I've read on the Rankine cycle indicates that the feedwater pump is necessary for the cycle to work. However the steam cycle used in traditional household boiler / radiator systems seems to ...
1
vote
1answer
34 views

Do you need to be a chartered engineer to submit structural calculations to building control in the UK?

I’m a graduate structural engineer with 4 years experience, working in the UK. A family friend is planning on doing a house extension which will require some structural calculations for steel beams. ...
1
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1answer
39 views

Where is the axis of bending for a box lifted by a crane?

A box is being lifted by a crane. Sometimes the box will be completely full, and sometimes it will only be partially full (indicated by the gray shaded regions). The question is, where is the axis of ...
1
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2answers
50 views

Does screed increase the slab tension capacity?

Does a screed applied over the slab increase the slab tension capacity? Somehow it's counter intuitive because adding weight on the slab should tension it, but do the slab and the screed behave as a ...
-1
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0answers
19 views

Heat transfer Chemical Engineering [on hold]

could anybody please help me with these two questions, i have been stuck on them for a very long time Many thanks]2
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1answer
25 views

What pressure drop is needed to get 15-20 gpm?

Scenario: There's a 1 inch, rubber hose, with fluid flowing in it at 75 psi. The density of the fluid changes (but I'll just be calculating with a specific known density, 8.35). So, I want to get the ...
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0answers
17 views

How to write the equilibrium stress equations for a hollow, rectangular beam?

I have a system consisting of a hollow, rectangular cantilever beam (pictured below). I'd like to write the equilibrium stress equations à la the Cauchy Stress notation. How do I account for the ...
0
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1answer
19 views

ANSYS Design Modeller more significant figures

I need to just get the volume from ANSYS Design Modeller but I would like a higher number of significant figures rather than just 5 (See picture). How do I do this? Thank you for your help!
0
votes
1answer
59 views

Looking to design a cantilever support to hold up an 80kg projector

I need to make a support (preferably metal) for a projector to be fixed on the wall. The projector size is: Width: 0.7m Length: 1.1m Weight: 80kg If anyone knows how i can solve this please let me ...
0
votes
1answer
75 views

Impact of having flexible electrical hose buried into the reinforced concrete slab

Given: a reinforced concrete two-way slab at about 160 mm (the edges are cantilevered between the concrete walls) the electricians buried the flexible electrical hose into the slab (red lines in the ...
0
votes
1answer
32 views

Can a horizontal foundation safeguard against earthquakes?

I have not taken any course in civil engineering. What I was taught was that a broad base would prevent something from toppling. So it makes me wondering instead of nailing the foundation of a ...
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0answers
15 views

Heating hot air within a 2 inch tube

Background So I am working on a project to where I am trying to heat up air within a 2 inch tube, with high air flow. I am using 2 inch tri clamp stainless steel tubes where I basically have a fan ...
0
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0answers
18 views

Auto-tuning PI controller with maximum sensitivity

I am trying to design an auto-tuning controller in matlab with the help of the paper from Astrom and Hagglund: Design of PI Controllers based on Non-Convex Optimization* (1998). They use the maximum ...
1
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0answers
31 views

Can I use a single stator coil to actuate/rotate two rotors inside and outside of the stator

I want to design a motor system where a single stator coil is responsible for two rotors of neodymium magnets on its outside and inside, will this work, and what are the downsides I should be ...
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0answers
19 views

CAD software recommendation for Aerospace [closed]

I am undergraduate in Aerospace engineering and I want to learn CAD so can you list some good CAD software (free and paid) helpful for airplane designing?
-1
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0answers
16 views

How to simulate the penetration of a liquid between two contact surfaces using Comsol Multiphysics?

I am facing a problem to simulate the penetration of a liquid inside a hyperelastic structure. I have used a predefined model of a water balloon based on FSI simulation I found on Comsol's website, ...
0
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1answer
48 views

Identify plant transfer function to design PID controller

I am trying to find the transfer function of a plant that contains numerous equipment including a heater, several tanks, pumps, membranes etc. I need to design 2 PID controllers: the first one to ...
0
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0answers
27 views

water pump problems

I am presently facing a problem in water plant . In a tank there are four pump placed at equal distance named A B C D .in this arrangement A and D positioned at near corner of the tank . I started ...
0
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1answer
51 views

Can an enclosure be water tight and NOT air tight?

I am trying to create an air tight cable exit system for a fuel tank. Basically, an instrument is to placed in the tank, with its cable exiting through the top of the tank. This exit point needs to ...
0
votes
1answer
22 views

off-scale torque measured - what is my torque arm?

I have assembled a benchtop torque measurement stand for evaluating electric motor and controller efficiency. The motor is 49kV , 5kW brushless outrunner. Input power reading is taken from motor ...
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0answers
14 views

Where to purchase a high pressure electrochemical cell [closed]

I want to purchase a high pressure cell that's corrosive resistant and can perform impedance spectroscopy tests. Is there any company out there that can make this cell? Specs: volume: 10ml pressure: ...
0
votes
1answer
52 views

Wire heating and heat transfer in a cylindrical pattern

I have a series of copper coils with ¼” cooling plates between each coil. The cooling plates will be manufactured from aluminum and cooled using copper tubing. There are seven in series, and a plate ...

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