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1answer
60 views

Installing satellite dish to point to local zenith

After receiving help on my previous post (Stopping/reducing wobbliness in threaded rod), I've decided to come back and ask another question: how can I actually hold the satellite dish into place? I ...
0
votes
1answer
50 views

What type of bearing used in swivel arm?

To model a swivel arm on column that rotates by hand What type of bearing should i use Should it support radial and axial load or just supporting axial load is enough ?
0
votes
3answers
30 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 ...
0
votes
0answers
11 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
votes
0answers
7 views

How can i transmeat video feed along with control signals in my wireless CCTV system?

I am try to build wireless cctv camera system. in here, i want to use only one camera. and camera give live feed and camera must be rotatable.suppose, i intend to use android application that ...
0
votes
1answer
43 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 ...
4
votes
2answers
156 views

Six-Wheeled Mousetrap Car [Concept]

My classmates are making mousetrap cars to go 10 feet, and whoever goes the fastest wins. How a mousetrap car works is by attaching a lever arm to the snapper (the part of the mousetrap that shoots ...
11
votes
3answers
1k views

Schematic Diagrams for Mechanical Systems

Is there some sort of equivalent standardized schematical (topological) diagram -such as Piping and Instrumentation Diagram, Electrical Schematics, Process Flow Diagrams, etc.- for the realm of ...
0
votes
3answers
21 views

Design of Gating & Runner system in Gravity Die Casting

How to design gating and runner system in permanent dies so that material flows smoothly throughout the design without spilling back from the gating channel. What should be the shape of gating system ...
0
votes
1answer
44 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
27 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 ...
0
votes
1answer
57 views

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

Given: a reinforced concrete two-way slab at about 160 mm (supported in 4 edges) the electricians buried the flexible electrical hose into the slab (red lines in the image below) and then covered the ...
0
votes
0answers
18 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 ...
0
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0answers
8 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 ...
0
votes
0answers
2 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 ...
0
votes
1answer
24 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. ...
0
votes
1answer
20 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 ...
0
votes
1answer
27 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 ...
0
votes
1answer
22 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 ...
-1
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0answers
12 views

Heat transfer Chemical Engineering

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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0answers
12 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
votes
1answer
15 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!
1
vote
1answer
31 views

Locations of max stresses in a circular beam?

If a torque and axial force is applied to a beam with a circular cross section, where along the cross section of the circular beam is the location of the max shear stress, max bending moment, max ...
1
vote
2answers
67 views

How can I calculate the amount of heat my copper water trap can dissipate?

My small (1.5hp) air compressor is connected to a water trap made of 8mm copper of about 4 metres length. The idea is that you push the compressed air through the piping which cools it, condensing the ...
0
votes
1answer
19 views

Bonding PVC Cables To Metal Housing

I have thin, variable diameter PVC wires that run along a metal housing. Problem being, they can get pulled on and disconnect. I want to bond them down to the metal housing as a sort of strain relief ...
0
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0answers
15 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 ...
0
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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
votes
1answer
21 views

How to get element coordinate system information (location, angle) for each element using ANSYS Mechanical APDL

We can get local coordinate system information (location and rotation angle (in degrees) relative to the global Cartesian coordinate system.) by using ...
1
vote
0answers
29 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 ...
16
votes
8answers
20k views

How to stop water flow in a siphon?

I have assembled a small DIY drip-irrigation system for my terrace garden. Please have a look at the attached image. I switch on a small pump to start the drip-irrigation system and then switch it off....
10
votes
1answer
1k views

Calculate force to lift piston from a given closing pressure

I am trying to calculate the force required to close the valve on an annular blow-out preventer. A rubber ring (called a packing unit) closes around the pipe when a force is applied from underneath, ...
2
votes
4answers
62 views

When reaming a hole to fit a bearing, can I get an underfit by icing the workpiece?

It's my first time working with bearings, but this is a necessary part of my robotic arm project. I have some $10 bearings that are 24mm OD. I want to fit these tightly in a hole, ideally getting a ...
0
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0answers
17 views

Robotics Performance Requirements - Autonomous Vehicle [closed]

Say we are developing an autonomous vehicle. Our vehicle must detect and respond to stop signs. How do we define performance requirements for this safety critical task in regards to correctness?
0
votes
1answer
43 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
votes
1answer
60 views

How do I calculate the force coming from the centrifugal compressor exhaust?

Let's say I have a centrifugal compressor as shown in the figure and I know the following parameters----1 Thrust Inlet and outlet pressure Power required to operate the compressor Inlet and outlet ...
-1
votes
1answer
47 views

Is the core of an RBMK reactor submersed in coolant?

I have looked at many diagrams of the Chernobyl reactor and am wondering where the coolant comes from that enters the control rod channels when the control rods are raised. All the diagrams show ...
0
votes
2answers
29 views

Would a cross correlation between vibrations in the X and Y directions help determine vibrations in the Z direction?

I have a 2D vibration sensor that can only measure in the X and Y directions, and it is mounted on top of a motor that is fixed into place, as shown in a rough sketch below. Would I be able to work ...
4
votes
3answers
143 views

Why is a cart with swiveling casters in front stable, but not if the swiveling casters are in back?

Consider a four-wheeled cart that has swiveling casters for the two front wheels, and has wheels that don't swivel in back. For example, a common shopping cart, or trolley if you prefer. If such a ...
10
votes
5answers
1k views

How is a mechanical system designed and tested without building a physical model?

I am new to mechanical engineering, although I have a scientific background (postgrad in Mathematics), and I (mostly) code for a living. I have an idea about creating a mechanical device; I envisage ...
0
votes
0answers
16 views

CAD software recommendation for Aerospace [on hold]

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
votes
0answers
14 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
votes
2answers
43 views

How is the flow work PV?

I am reading thermodynamivs from cengel and boles.I am currently studying flow work.Following image contains text of the book. (https://i.stack.imgur.com/eCGXR.png) The workdone is calculated by ...
0
votes
0answers
23 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 ...
1
vote
3answers
40 views

How to calculate properties of a thread?

I have a simple thread joint between two objects: and want to find a size of those threads so that after rotating male part it stands at the specific angle. For those who is curious I made it in ...
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 ...
0
votes
1answer
18 views

Fusion 360 animation , contact sets

I was designing a whit-worth quick return mechanism, I have provided the contact sets but they fail when I try to animate. The contact set is defined for the crank and slotted link.
2
votes
2answers
636 views

Is there an equivalent to the 'equal' constraint from solidworks in fusion 360?

I used to use Solidworks a few years back and am now trying to learn Autodesk Fusion 360. So far I'm pretty impressed but one thing I've not found is something like the ...
0
votes
1answer
50 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
0answers
13 views

Where to purchase a high pressure electrochemical cell [on hold]

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
0answers
15 views

How to calculate the temperature rise in a PCB with 24 DIMMs?

I've designed a motherboard sized PCB (.8sqft) with 24 DDR2 DIMM modules running on it. I'm having trouble figuring out how to calculate the temperature rise. My calcs come out to 128F temp rise over ...

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