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288 views

Mechanical Linkage Question - Velocity Diagram

Can someone confirm the velocity of B, given point C has velocity of 3 units/s down and point A has a velocity of 5 units/s upwards? My approach has been to resolve for the tangent velocity component ...
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1answer
52 views

Daylighting, how to improve coverage

I am doing this daylighting project for which we must bring the light far down into a bunker. I have found . I have heard and read that the quantity of light that you bring in a cable decreases, 60% ...
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1answer
650 views

Finding mass flow rate and exit temperature in heat exchanger stream

I'm working on a heat exchanger design project and I'm stuck at one of the first steps - energy and rate balance. In the problem, we have a hydrocarbon stream getting cooled by a water stream. We are ...
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2answers
375 views

Control the rotation of multiple discs along the same axis

I have an engineering background, I'm an EE, but I know almost nothing about mechanics and that's why I'm writing here. This is the challenge: how to control the rotation of multiple discs along the ...
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1answer
47 views

Thermosiphon System

I am working on a project and I have some questions about setting up a passive heating system (thermosiphon) with a heat exchanger. I will have a main boiler with a coil of copper tubing inside. This ...
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1answer
50 views

What is the analytical approach for a fiber cutting machine?

Folks, so today in the Lab I came up with this problem (see picture). It shows a cross section of a cutting machine. There's a blade moving with a constant speed $\frac{dx}{dt}$ towards the center of ...
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1answer
2k views

How to calculate temperature rise on AC induction motor in an evaporative cooler centrifugal blower?

A neighbor recently asked me if his evaporative air conditioner was running correctly because he felt the blower drive motor and it was too hot to leave his hand on it for long. I was surprised to ...
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1answer
308 views

How is RF data encoded in WAV files?

I have tried recording RF data using several different software packages: SDR Console, SDR# and HDSDR. They all seem to produce WAV files. When I open the HDSDR file in Mathematica, it says the file ...
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1answer
116 views

What is the most cost efficient way to cool a tank of oil with water?

I have a tank of oil which I plan to heat 24/7 with constant 15 kW. I want to dissipate this energy using water as a coolant. I have the outside unit of an out of order split type air conditioner that ...
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1answer
576 views

Vibration absorber design: free body diagram of a mass-spring system [closed]

Trying to draw the free body diagram of this, any help would be appreciated. The $y$ is the amplitude of vibration of ground. Up is the positive direction.
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1answer
943 views

Car Suspension Force Equations

So I have found this equation: $F_\mathrm{suspension} = Kx + F_\mathrm{damper}V_\mathrm{contact}$ Where: $K$ = spring stiffness $x$ = the contact depth of spring(also known as spring compression) $...
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1answer
82 views

Would this be a practical way to convert tidal energy into electrical energy? [closed]

Imagine a structure that is held above the water by pylons that are grounded on the ocean floor. In between these pylons is a pontoon that, when tides are rising holds and lifts a heavy weight. When ...
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2answers
163 views

Most non-sound-conductive materials, especially when abutting conductive material

I was wondering what the most non-sound-conductive materials are, especially where those materials are abutting materials that are sound conductive. For example, imagine a long bar or block, and ...
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1answer
183 views

Reduction of a simple distributed loading (correct question)

I am not yet at the chapter of equations of equilibrium, plus it says the couple moment is not 0, so I assume it just about the loadings and not including the reactive forces and reactive moment. So ...
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1answer
338 views

Refrigerator temperature - compartment gas volume exchange, time to equilibrate?

I open the door for 30s of a 140L capacity 80W (240VAC, 0.8A) barfridge with a 20L freezer compartment (partition open to main compartment at one end) at a temperature of -5℃ with an internal main ...
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votes
1answer
1k views

Rubber Band for Belt in Belt Drive system

Looking to drive a series of belts for lateral translation using a series of pallet bands (92" rubber bands about 1" wide). Approximately 16 bands would be driven by a singular band as illustrated (...
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1answer
23 views

Solubility Data

I am trying to obtain solubility data for a polymer in sc-CO2 and the data is reported at each T and P as $$w \ \ \times \ 10^6$$ Does anyone know what this means?
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1answer
305 views

Air flow dissipation rate

Consider two streams of air flowing through the nozzles to an unlimited volume with atmospheric pressure. The flow is the same, but the cross section areas of the circular nozzles and the speeds ...
0
votes
1answer
132 views

Fast and quitet linear actuator for lifting less than a kilo

I'm looking for a linear actuator that can lift a microphone of about 700 grams. It's for a goose-neck microphone (together with shock-mount) that will pop out of a small pulpit. Only the top part is ...
0
votes
1answer
61 views

Continuation of learning CAD/CAM/CAE packages [closed]

Don't know about you but here in Spain, in the practice lessons we use some software related to the field (for example, ADAMs for Multibody Systems in MechE, right now). Then when the course ends, we ...
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votes
1answer
537 views

How far can my FM transmitter signal reach?

I have a working FM transmitter on a raspberry pi2. I'm running my FM raido at 103.3MHz, and the antenna that I connected to the GPIO4 is a 70cm copper wire. More data:(checked with a multimeter ...
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votes
2answers
161 views

Using compression screw as air engine

Can a screw such as the one below be used as an air engine in pressure range between 700 kPa and 2500 kPa on other words Can I reverse compression process with a screw to work as air engine
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votes
1answer
227 views

Mass Transfer Question

Predict the diffusion coefficient for nitrogen through a mixture containing 50% hydrogen, 30% ammonia, 15% nitrogen, and 5% water at 25°C and 1 atm. This was my thought process on which equation to ...
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1answer
62 views

beam cross section modeling by extrusion on proe

I would like to create beam models having various cross sections on ProE tool. Can I create a beam model like below by only extrusion? Can anyone explain what is the best way to model various cross ...
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votes
1answer
565 views

What options are available to create a vacuum with hydraulics? [closed]

What options are available to create a vacuum using hydraulics? I am working on constructing a small planter which needs a vacuum to operate. Planters operate best at a pressure of 10 PSI. I ...
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1answer
100 views

how to calculate the time for retransmission in slotted Aloha

I need to configure my code to make retransmission in slotted Aloha in case of collision, how to choose the timer ?
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votes
1answer
2k views

C15 Equivalent material in IS standard

I am need to match DIN C15 steel with an Indian steel but I don't know the equivalent grade in the Indian standard. For example, DIN C40 steel is known as EN8 under the IS standard; similarly, what is ...
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votes
1answer
167 views

How to choose an insulating material for a heated metal rod

I have a rod heater mounted in a brass rod and I need to coat the rod with a solid thermal insulator. I have the following options: PTFE Teflon Polyurethane foam However, I doubt that the foam would ...
0
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1answer
84 views

How are electronics hardened against extreme accelerations?

How does one protect electronics against extreme accelerations/impacts? I mean accelerations of at least 2000g, possibly an order of magnitude more; essentially "payload" of an artillery shell. The ...
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votes
1answer
57 views

Are super-batteries theoretically possible? [closed]

Is it theoretically possible and/or economically viable to construct batteries capable of supplying an entire city with electricity for a day or two? One of the big problems with power plants of any ...
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votes
1answer
304 views

At what cold ambient air temperature will power lines fail?

I'm wondering just how cold it would have to be before electric power can no longer flow through overhead power lines. I know power lines generate a certain amount of heat just as a side effect from ...
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1answer
668 views

What is the numerical diffusion?

I studied many papers and I face with concept of numerical diffusion,but I don't understand it. Can someone explain briefly about numerical diffusion?
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1answer
5k views

Why is there reverse flow in Fluent?

I am simulating a axial turbine and number of cell are about 3000000. Under relaxation factors are as follows: Pressure: 0.1 momentum:0.1 Turbulent kinetic energy: 0.5 Turbulent dissipation rate: ...
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1answer
70 views

Required mass of wood to produce 20 Watts/Hour

Requirements: I need to produce $20\ \mathrm{W}\,\mathrm{hr}^{-1}$ by burning wood. The specific energy of wood is $21\ \mathrm{MJ}\,\mathrm{kg}$ Find the required mass of wood to produce $20\ \...
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1answer
65 views

Find optimal configuration for Stirling Engine

I'm trying to figure out the theoretical calculations for a Stirling Engine system so I can determine optimal piston size, optimal piston displacement and number of pistons. I want to calculate which ...
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1answer
761 views

Exact procedure to mount a blanking spade near a butterfly valve

This is a follow on to my previous question about blanking spades. There's a gas pipeline with a butterfly valve mounted between to flanges. I want to work on one side (call it the inert side) and ...
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2answers
158 views

How can electrical noise be isolated in an Embedded System?

An input device sends a 20ms positive signal to perform an action. The signal is captured using an interrupt triggered on the rising edge of the positive signal. It appears that there might be some ...
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votes
1answer
68 views

Identification of Foundry equipment

Good day! We (undergraduates w/o prior foundry experience) inspected a foundry for its health hazards, our problem is we are not permitted to be accompanied by a laboratory assistant, so we don't have ...
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votes
2answers
206 views

The Horizontal Force of Water as it turns 180 degrees

For a National Board Exam Review: A uniform area jet travels to $600 \frac{ft}{s}$ and a $100\frac{ft^3}{s}$. What is the horizontal force acts on the water jet if it undergoes a $180^\circ$ ...
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2answers
1k views

Height Increase by a Floating Cylinder Over a Larger Cylinder

For a National Board Exam Review: A floating cylinder 8cm in diameter and weighing 950 grams is placed in a cylindrical container 20cm in diameter and partially full of water. The increase in ...
0
votes
2answers
149 views

Live motion simulation with respect to electromagnetic field software

Totally numb question from non-engineer, so sorry about that. For my little home project I need to create a matrix of solenoids, so I need some kind of simulation. I wish to be able to create metal ...
0
votes
1answer
725 views

Guidelines for motor shaft length and pulley engagement

Searched, but didn't find this discussed here previously. I'm upgrading a hobby-level CNC router (a Shapeoko 3) to have wider belts (it came w/ 6 mm GT2 (2 mm)), I'm going up to 9 mm (otherwise same ...
0
votes
1answer
4k views

Calculating the heat energy supplied by a superheater

I am answering this question: Steam enters the superheaters of a boiler at a pressure of 25 bar and dryness of 0.98% and leaves at the same pressure at a temperature of 370 °C. Calculate the ...
0
votes
1answer
628 views

How to create Embedded System Program from Scratch using Keil µVision? [closed]

I have been learning the program embedded systems using Keil µVision 4.7 free version from Mentor graphic. So far all the learning has be using projects that have been already pre-defined. This has ...
0
votes
1answer
186 views

Px26-015 pressure sensors output

I had a PC Mountable Wet/Wet Differential Pressure Sensor I used it to measure a pressure difference , I don't know how to convert its output to pressure !
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0answers
7 views

Modelling a rough surface of Ti6Al4V alloy in LAMMPS

I am trying to use LAMMPS molecular dynamics software to model the surface topography of a Ti6Al4V alloy that was created using a selective laser sintering process. This is to model the asperity and ...
0
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0answers
10 views

How to accurately use the approximation formula in a ritz approximation?

I have been able to do all the steps required in the question poised in the problem below to get to The issue I am running into is trying to use to actually obtain values to obtain numbers for my ...
0
votes
0answers
8 views

Low temperature flexible polymers

I'm working on a design project that will require a flexible component that will be operating at temperatures from $0^{\circ}$C to $-200^{\circ}$C. Are there any thermoplastic polymers that remain ...
0
votes
0answers
10 views

Sutherland's law for other gasses

Sutherland's Law seems to be a fairly well-accepted relationship between dynamic viscosity and temperature and was originally created to work for ideal gases, though it is often extended to be used ...
0
votes
0answers
15 views

Effect of wind on ultrasound sensor

For example, if I have an ultrasoundsensor 1 m above the ground while there is a wind speed of 5 m/s, a rough estimate of the horizontal displacement of the beam would be $$ t \approx 2 \frac{1}{343} =...

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