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1answer
28 views

How to calculate airflow in m3/min on a gas turbine outlet?

I'm currently trying to figure out the airflow of a gas turbine in m3/min. I thought that i would be able to measure the windspeed over a known cross section on the intakte of the turbine and then ...
2
votes
4answers
69 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 ...
3
votes
1answer
36 views

What's the most practical way to measure angular velocity for small rotations?

I'm looking to measure the angular velocity of an arm as it moves. It seems to be a difficult thing to research, since the term 'angular velocity/frequency' is usually reserved for other areas of ...
2
votes
0answers
35 views

How do old wind turbine towers pickup magnetism overtime?

I was conducting some robotics tests on a old wind turbine today, and noticed strong magnetic fields around the steel tower. This magnetic field does not exist on other modern wind turbines at the ...
0
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0answers
8 views

Custom User Models in Aspen Plus

I'm trying to simulate a purifier in Aspen Plus in a cryogenic system. This purifier is just meant to change the pressure of the outlet stream based on the inlet flow and pressure (we are using the ...
0
votes
2answers
30 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 ...
0
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0answers
16 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 ...
0
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0answers
12 views

Facing problem in simulating Combustion in ANSYS IC Engine Fluent

I am working on the project of Modelling of Combustion Process of Internal Combustion Diesel Engine Using Ansys ICE Fluent, in Which I am facing problem to obtain the Desired Result. My Objective: ...
0
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0answers
21 views

How to detect milk spillage or milk boil?

In my country we generally boil milk before we drink. Often the milk heats up and spills from the pot. I want to detect milk boil before it spills off.I am thinking of a thermal camera solution that ...
1
vote
2answers
103 views

What does it mean that the mass of a propellant tank is at premium?

I am reading the rocket propulsion elements book by sutton and I came across the following statement: "Because the propellant tank has to fly. its mass is at a premium and the tank material is ...
0
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0answers
8 views

How does Milkor MGL Granade Launcher's trigger and cylinder mechanism work

I want to know how does Milkor MGL's trigger and cylinder work. In particular, I am interested in how exactly the trigger action switches the cylinder among the cartridge chambers. As far as i know, ...
0
votes
2answers
51 views

Designing a 1-button system allowing for a differentiated control of 2 different valves?

I'm in the processes of building something which requires I'll be able to control the independent opening/closure of two (small, ~10mm in diameter) different adjacent holes using one finger, and I'm ...
0
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0answers
16 views

How does a digital controller's sampling period dictate the system's actuation requirements?

When selecting an actuator for a controls application - e.g. choosing a servo motor for a self-balancing robot - I understand that it's important for the actuators to have fast enough dynamics that ...
0
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0answers
17 views

How to calculate compressive yield strength of a composite material or a fgm?

I know the volume fractions of HAP and titanium in a functionally graded material. How can I find yield strength of it?
0
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0answers
18 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
3answers
56 views

Fastening a Nut on threaded rod from the middle

Does there exist any type of Nut, that can be screwed on a threaded rod that can slipped in without having to go to the ends of the threaded rod? I can sort of imagine a Nut that was a ...
1
vote
2answers
31 views

How do maglev trains turn given that they seem to have more than two bogies per car?

All of the images of maglev trains that I've seen seem to have a continuous drive mechanism along the entire length of each car: I assume this must be articulated some how, or the train wouldn't be ...
1
vote
0answers
15 views

How to minimize temperature increase caused by compression of a cryogenic liquid in a multistage high pressure turbopump?

The cryogenic fuel I'm using is methane at 100 K and 300,000 Pa. Based on my calculations, after compression, the pressure is 55 MPa and using the ideal gas equation the temperature is approx. 800 K. ...
0
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0answers
37 views

Why does DSG have low torque capacity?

Why does DSG have low torque capacity? They are very simillar to manuals but manual transmissions can handle greater torque. Why js that? What determines the torque capacity of transmission?
1
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0answers
20 views

Generating random samples for some concrete structural characteristics [closed]

I want to test a program that performs FRP concrete structural strengthening calculations according to a particular design code. As inputs for these calculation, there is existing concrete cross ...
0
votes
0answers
27 views

Software to find the common volume of intersecting cylinders?

I would like to find the common volume between cylinders for different radii and at different angles (3-D). Can I do this using ANSYS design modeller? Or what can I use (preferably a free download for ...
0
votes
1answer
40 views

Simple Thermal Analysis for sealed Aluminum box with 3.7 Watts of heat generation internally

I am looking for a starting back of the envelope calculation to determine if an aluminum box with just free convection can dissipate 3.7W of internal heat generation or if I need to think about adding ...
3
votes
0answers
32 views

What kind of professional(s) build/design factories? [closed]

I have a small self-built food processing unit (500sqft) but it is very labor-intensive. I want to make a larger unit (45,000sqft) with 100x more output using factory machinery (automation, conveyor ...
0
votes
1answer
26 views

Stopping Force of Irregularly Shaped Object

I have a quick question about the force needed to accelerate/decelerate an irregular object. Lets say I have a 3D object with the following general shape, This system is in general a gripper (gray) ...
-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
0answers
8 views

Heat press of vinyl on 100% polyester fabric

I want to customise a piece of fabric that is 100% polyester (exclusive of decorations, wash at 30º) with vinyl. My idea is to use a vinyl cutter (such as Silver Bullet) to cut a pattern on the sheet, ...
0
votes
1answer
17 views

mould for boring enclosures

For an electronics device that I make I use a standard plastic (I think polystyrene) enclosure. This enclosure needs to be precision-drilled, ant I lack the dedicated equipment. What I think would ...
0
votes
0answers
15 views

BLDC motor - stator

Can someone help me with this stator? I need to know the relevance of the bump up the side of the stator highlighted in yellow as well as slots. Is it to do with startup? Also can you clarify written ...
0
votes
2answers
46 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
2answers
32 views

Extendable apparatus

Is there a kind of "handbook" for general engineering ideas and possible applications? I vaguely remember a machinist friend mentioning some standard book to glean ideas from... I'm in need of an ...
3
votes
1answer
61 views

How do Salad Spinners work?

I am curious as to how pump salad spinners work: not in terms of how they spin and use centripetal forces to get rid of water. I mean in terms of how the pump itself works. How does the 2D motion of ...
0
votes
1answer
31 views

What is the type of this connector?

Can someone tell me what the type of connector is??
1
vote
1answer
54 views

Is there a rule of thumb to construe a screw

When your first idea is drafted you calculate which forces/pressures and so on are working on your system. And then you break the forces down into the single screws which are built in your device. ...
0
votes
0answers
11 views

Stepper motor synchronization

What approaches there are for multiple stepper motor synchronization when I'm building software for two axis CNC machine. I could think of two: event loop always step one motor and conditionally ...
2
votes
1answer
39 views

Closed loop guidance and control: how to tune a system with multiple feedback controllers?

I'm trying to design a closed-loop guidance system for rockets - something that can be implemented in Kerbal Space Program, for example. To do this, I'm following the design process described in ...
0
votes
0answers
17 views

Are there impulse turbines operating on hot exhaust gas?

Are there impulse turbines that operate efficiently on hot exhaust gases rather than water as the working fluid? Im thinking about something analogous to a water wheel, since it seems that bucket/...
1
vote
2answers
35 views

In static equilibrium body, how can an applied moment about an axis contribute to reaction moment to another point away from the axis?

Determine the resultant internal loadings acting on the cross section at B of the pipe shown in Fig. 1–7a. End A is subjected to a vertical force of 50 N, a horizontal force of 30 N, and a couple ...
0
votes
2answers
38 views

What kind of mechanism can be used to rotate a part in 180 degrees (Ψ (yaw)) and 30degrees in 𝜃 (pitch) direction?

Let's say we have a flat object. We are asked to create some mechanism so that the part can rotate in the shown angles above. What mechanisms can be used?
0
votes
1answer
41 views

How can I connect F=ma to Drag=1/2*Cd*(rho)*V^2*A?

I previously posted a different question that was very vague. I have kept working on the problem, and now I have a different question. Please let me know if I should have just added it to the old ...
0
votes
1answer
31 views

What are the different methods to join 2 parts so that one can rotate 180 degrees around the other?

Let's say we have one simple box and its bottom has been cut in a circular shape. We want to attach another box to this box that can rotate 180deg around the first one. What mechanism can be used to ...
0
votes
1answer
16 views

In a warmer/sunnier climate, window (or roller shutters) superior to curtains?

When -on a hot day- the sun is incident on a window covered from the outside by a closed window shutter, the resulting heat is absorbed by the layers of air surrounding the shutter, subsequently ...
1
vote
1answer
49 views

Kinetic energy of a balloon

How do I quantify how much kinetic energy would be released from popping a balloon? I believe that any additional kinetic energy that results from the balloon will come from it being pressurized, but ...
0
votes
1answer
19 views

Material for filling small air leaks

Often beeswax is used to seal small air leaks on some musical instruments. One of the disadvantages of beeswax is that it has a melting point of around 140 degrees Fahrenheit and can therefore flow to ...
0
votes
0answers
16 views

Generally speaking are inrunner motors better generators than outrunner motors or vice versa?

Using a motor as a generator but looking to test something I understand that outrunners have a higher torque but would that be neccesarily good for generating electricity or not?
2
votes
1answer
60 views

Is it possible to move gear on a shaft in one moment and in the other allow it to rotate freely?

Before I describe the problem I would just like to say that I'm no engineer this is my hobby, all I know is from google or if someone told me or from books. Something obvious to you may not be obvious ...
1
vote
1answer
42 views

What is the purpose of colour code for telephone wires?

I'm trying to understand how telephone wires work. I've stumbled upon this kind of identification method with colours. I can't manage to understand the reasons why is used and if it's still common to ...
0
votes
1answer
13 views

Relationships among turbo jet rpm and compression ratio and thrust

A question about performance of a turbojet. Why are compression ratio and thrust are not in linear but increase exponentially with RPM?
0
votes
1answer
19 views

Master/Slave Gear Mechanism for Navball

I am designing a functional replica of the Apollo FDAI (aka 8 ball). See pics Real FDAI Another view From the Apollo 8 Flight Journal: The FD/AI (Flight Director/Attitude Indicator) or "8-ball" ...
0
votes
0answers
12 views

BLDC Controller recommendations [closed]

Any suggestions for high voltage BLDC controllers i.e. 350VDC (rectified mains). Is it a case of just using lower voltage controllers and upping the output stage to handle the higher voltage and ...
0
votes
0answers
16 views

Designing Block Diagrams For Control Systems

I'm looking for good software to design control systems, and more specifically to neatly design "block diagrams" for control systems. Is there something like that?

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