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10 views

How to use a specific list of components in a stream in ASPEN-HYSYS?

In HYSYS it is possible to create multiple lists of components using their proper fluid package to better calculate the properties of very different molecules. Here I defined two lists: List 1 List ...
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1answer
17 views

Create Bezel-like ring mechanism

I'm designing a 3d print model of a ring that you can wear, but the outer surface of the ring can be dialed like a watch bezel. Check this video to see how the bezel moves in grades so it stops on ...
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1answer
58 views

PC Controllable DC Power supply (0-30V)

I have a Proportional solenoid valve that uses a 0-30VDC for control (opening the orifice) I only have capability to provide 0-5V or 0-10V. I need to control the valve using my PC. Is there any DC ...
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0answers
20 views

Is it possible to simulate the electric power output of a linear alternator using finite element analysis software?If yes, which?

We need to build a small (1-2W) linear alternator for a project in engineering school. Is it possible to use finite element software to finetune our design instead of actually building real life ...
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1answer
53 views

How to Find Drag Force from Skin Friction

Just wondering if someone can please can give me some idea, as to how I can solve this question that is not related to current study. I haven't been able to work out where to start with it just yet. ...
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1answer
17 views

Effect of step pulse shape on stepper motor function

I am using Nema17 12 v motors with A4988 drivers for a project that drives an XY stage. I am programming the pulses to the STEP pin of the drivers in C and I can control the frequency and the shape of ...
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1answer
34 views

What is causing a pulsating, low-frequency vibration in an induction motor?

I have this old squirrel cage induction motor (nameplate below) that I just replaced the bearings on. When it runs, there is a rattling noise that gradually gets louder and then softer, repeating ...
1
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1answer
19 views

Gear switching for simple differential steering

I'm rather new to the field of gear systems, and to the field of RC models to which this case applies. I'm trying to design a system where a single variable speed engine would drive two different ...
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0answers
11 views

DC-DC Non-isolated Converter

I have been reading the difference between isolated & non-isolated converters. How can I find out what the standard for CSA or UL for DC to DC converters is?
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2answers
62 views

Design a part to straighten moment and reduce torsion

I have a configuration with two bolts and a point of force application (see figure). I understand that, if perfectly rigid, the two parts depicted in the figure will behave identically in how they ...
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1answer
33 views

Why stagnation temperature doesn't change in stator

I was going through a review of rotary compressor and i understood that the stagnation pressure and stagnation temperature both change in the rotor stage (as energy is being added).I also read that in ...
1
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1answer
33 views

Calculating mass flow rate of a scramjet engine?

First post here. I'm an undergraduate ME interested in fluid mechanics. I came across scramjets and I was interested about the engine. I want to calculate the mass flow rate of the engine and I made ...
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2answers
41 views

Could a sound be only heard far from the speaker?

I am wondering if it is possible to create a sound on a location, say A, where it is not heard (for example using another sound correctly set to "cancel" the first sound), but that could be heard in ...
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0answers
12 views

Advice for suspension 101 for a small ATV robotic platform [migrated]

I'm a recent grad from mech. eng. program and going into robotics field. I want to design a suspension for a small ATV robotic platform on 4 wheels that carries max 75 kg load. I might use the wheels ...
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0answers
33 views

Strange CAD excercises

a long time back at school, I had a difficult excercise which was named X, Y and Z bodies. They were drawings where both the front view and the top view were fully given. We had to find the view from ...
1
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1answer
35 views

Question regarding calculation of angular velocity connected to coordinate transformation

So i need to calculate the angular velocity of the dark disk, $w^*_3$. In the master solution they state it is : $w^*_3 = w_3 + \overline{w_3}$ with : $w_3 = \frac{|\dot{r}|}{4a}$ $|\dot{r}| = v_a +...
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1answer
49 views

Why don't we have parabolic ceilings with mirrors & a light at the focus?

I'm thinking of big halls, especially those that use chandeliers for light. The idea's simple: build a parabolic ceiling that uses mirrors, place the chandelier at the focus, and illuminate the entire ...
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3answers
25 views

How to accumulate torque of multiple independent gears?

I did not find any answers to this simple problem across the web, maybe seeking help in this forum helps: As an example, let's assume we have multiple windmills, each of them producing torque, but ...
1
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1answer
58 views

How to detect what wattage that my Windows laptop is receiving via USB-PD?

I don't know too much about USB-PD. I understood that USB-PD requires negotiation between the charger and the receiver. So probably my Windows laptop (Dell XPS 9570) should be able to know the current ...
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0answers
16 views

How To Obtain The Correct Differential Gears With Motor Shaft Adapters

My knowledge in gears in limited to their types (bevel, spur, etc). I am trying to combine the power/torque of two DC motors using a differential gear. I have a good handle on the idea and design ...
0
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1answer
13 views

Squirrel-cage air blower efficiency

What would be the typical efficiency of a large industrial single-stage squirrel-cage air blower? For example how many kilograms of ambient air (STP) would be moved per second by such blower which ...
0
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1answer
21 views

Friction factor for wormgear design materials

I'm working on a database which involves geometric design parameters, forces analysis and efficiency and losses for wormgear reduction design systems. To determine the tangential and axial forces ...
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1answer
22 views

Pressure Coefficient with a Minima of 0 on Compressor Airfoils in Cascade

I am a relatively recent BSME graduate working on reproducing the results of a technical paper to strengthen my ANSYS CFX skills. The paper is "Effect of Section Thickness and Trailing Edge Radius on ...
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1answer
37 views

New Part Number for every firmware update?

When developing an ECR/ECN process, the question of when to roll a rev vs. when to create a new part number must be answered. In researching this question, I've come across multiple sources that ...
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1answer
36 views

How exactly do noise canceling headphones work?

I purchased a pair of noise canceling headphones today and I was just wondering how exactly they are able to cancel out background noise?
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0answers
12 views

Spectral Efficiency of FDD, TDD, and FD

I would like to show at high level that, in principle, the spectral efficiency (SE) of frequency division duplex (FDD) equals the SE of time division duplex (TDD) and both of them are half the SE of ...
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2answers
43 views

not sure how to use a signal from a sensor to make a lightbulb turn on or off

I am a very new student of engineering. I am in high school. The problem is my grandpa has an obsession with checking to see if the garage door is closed. So my dad is trying to get me to develop a ...
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1answer
29 views

Identify electronics connector from pinout

Is it possible to identify an electronics connector with the pinout diagram? For instance, this diagram shows an 18+2 pin configuration along with a key slot of some type at the top. The diagram ...
1
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1answer
16 views

Regarding rubber vibration properties

I read an article in a textbook which says stiffer rubber increases vibration damping and softer rubber increases vibration isolation. Can anyone explain this how? What is the difference between ...
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0answers
15 views

cnctrain set xxxlink

Respectful all, I am newbie in cnc simulator software. I encounted a problem with fms unit manufactured by mtab working with relatively old version fms version 2.1 and cnctrain 4.5 both programmes ...
1
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1answer
25 views

How to estimate wind generation using power curve?

I am trying to verify windfarmer generation estimates manually. To do so I am trying to manually calculate the estimated energy production (kWh) of a wind turbine. The information I have available is ...
0
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1answer
26 views

How to infer from the volume fraction function whether a flow is transient or steady?

Hello dear engineering community. I have a specific question about multiphase flows. I was wondering if anybody could help me with it, please. Assume, I have a one dimensional water-air flow. Air is ...
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1answer
24 views

Laser engravers and focal points

If I understand it correctly in a CO2 laser engraver/cutter the laser itself is fixed in position and mirrors are used to redirect the laser to the material. Is there some mechanism used to keep the ...
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1answer
25 views

Turbineless steam propulsion for ships

In the early days of steam engine powered ships, wouldn't a system that intermittently injects high pressure steam above a wide column filled with water, thereby displacing the water and expelling it ...
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1answer
22 views

Regarding automotive engine mounts

How are automotive engine mounts tuned to behave differently for different frequencies, like they are soft for high frequency low amplitude vibrations and hard for low frequency high amplitude ...
0
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1answer
24 views

Steel tube wall thickness for moving a machine

I need to move a machine, approx weight of 900Kg I will put 3 tubes under the machine and roll the machine on the tubes Holidays season, all industrial suppliers are closed around me and only have ...
0
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2answers
28 views

What are the design trade-offs in the different rocket engine cycles for liquid propulsion systems

Liquid propelled Rocket engines work on various cycles such as pressure-fed, pump-fed(gas generator,staged combustion, expander, etc) and these have various design trade-offs between complexity, ...
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1answer
22 views

Could stepper motor lose torque because of overheating?

I have a stepper motor on a 3D printer that heats up very bad because of the heated extruder (it is actually controlling the extruder). When this system starts, it works fine at the beginning, while ...
0
votes
1answer
54 views

What is a material that allows air to pass but not water vapor?

What are some materials that allow air to pass but not, or to a lesser extent, water vapor? Here are two materials I am aware of: Teflon is a material that allows water vapor to pass, but not air. ...
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0answers
31 views

Non Orthogonal Multiple Acess and Channel Quality Indicator

As we know in a 4G network, the LTE give us a correlation about the SNR of user and the data rate of the user. This correlation is usually a table called Channel Quality Indicator (CQI) which is found ...
0
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2answers
49 views

Why are tri-axle trailers with single wheels more stable than double wheels?

I'm revising for the UK LGV theory test. One of the questions goes something like this: Which axle configuration is most effective at preventing petrol tankers from rolling over? A. Tandem ...
1
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0answers
32 views

What propulsion method: Franky Zapata hoverboard

Looking for the answer to what kind of engine provides the thrust on the French hoverboard on which its inventor, Franky Zapata, recently crossed the English Channel, I find the same phrase repeated ...
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2answers
31 views

FEA software for Orthotropic materials

What FEA software is capable of simulating static studies on orthotropic materials such as wood? I must be able to define mechanical properties in X,Y and Z. I would also like to have access to ...
2
votes
1answer
51 views

What happens when an LCD screen shuts off?

I read about how an LCD screen works here, and it made me wonder what actually happens when the screen shuts off. Based off of this, I can think of several possibilities: Electricity is supplied to ...
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0answers
10 views

How is “critical service” defined, according to DIN EN 1591-4?

DIN EN 1591-4 specifies how installers for flanged connections ind piping systems "in critical service" are to be trained and certified. The only definition of critical service given in the ...
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2answers
39 views

Chain length increasing during rotation of chain sprocket pair?

I am writing a program to calculate chain lengths required for a particular sprocket pair when I noticed this Consider a 9 teeth sprocket paired with an identical 9 teeth sprocket (image reference) ...
0
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1answer
25 views

Time to change temperature inside the box

I have an interesting problem here. I have a box of certain dimensions. Inside of the box is some insulation and another box, from the same material as the outer box. I know everything possible about ...
3
votes
2answers
902 views

What is the difference between washer and O-ring? what is their advantages over the other?

I am designing a hydrophone, from the piezo buzzer. To hold the circular piezo plate, I have designed a mechanical fixture. I need to use washer/o-ring to make it leak-proof. I am confused about which ...
3
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1answer
50 views

Why is the thread of the screw linear? Can it be wavy?

I noticed that the screw-on of my water tap often loosens itself up after I rotate the tap left and right enough times. Every time I rotate the tap left, it loosens the screw a bit, then if I rotate ...
2
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1answer
38 views

Why is the fluted edge of a twist drill bit sharp?

My intuition on how a twist drill bit operates is that the cutting is done by the end of the drill bit and that the fluted section carries away material as it's cut. When I look at twist drill bits, ...

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