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33 views

What Is The Liquid Depth Inside The Tank?

I know that $P_{total}=P_{gauge}+P_{atmosphere}$, so $P_{gauge}=P_{atmosphere}-P_{total}$ $P_{atmosphere}=101.325 KPa$ and $P_{gauge}=0.2 psig=1.38 KPa$. $P_{gauge}=(0.8 \times sin{30})(900)(9.807) -...
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0answers
22 views

How would I go about charging titanium dioxide for e-paper technology project?

I'm experimenting with rubbing a balloon on a silk (to get the electrons) and then touching the balloon to two small aluminium foil balls to see if they'll repel but they don't (if I do it with ...
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0answers
30 views

Is there an easy way to calculate carrier output of a planetary gear set which has two inputs?

Online I found many guides and videos on how to calculate outputs of a planetary gearset but all of them have only one input. But how can I calculate output speed of carrier if ring and sun gear are ...
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1answer
30 views

Self Weight in Moment Distribution (Hardy Cross)

When applying the moment distribution method also known as the Hardy Cross method, how do I take into account the self-weight of columns? In the case of the beams, I can just apply the weight load ...
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0answers
39 views

Force of Jet from Air Compressor

I want to use a compressor to create a jet of air. At discharge from compressor how much CFM (Cubic Feet per Minute) are enough to create a force that can turn a heavy object (say 40 kg) at 3 rev per ...
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0answers
9 views

Compute equilibrium temperature under a roof

I want to compute the equilibrium temperature below the roof (inside a building) to analyze the efficiency of an insulation layer. I impose the environment temperature $T_{env}$, the insulation layer ...
1
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1answer
30 views

Why is the tv playing if the carrier frequencies in our RF project appear unsupported?

My group made an RCA video/audio to RF modulator for a school project. The video is a NTSC composite video signal. Here is a clip of our tv receiving the output of the project on NTSC channel 2: ...
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0answers
20 views

Matching Air blower CFM vs HEPA filter CFM, and ΔP in WG, for laminar flow design

I am trying to build a laminar flow box using instructions at these YouTube links for design and build. They recommended getting a Dayton squirrel cage air blower model 1TDU2 rated at 1202 CFM. The ...
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0answers
21 views

Gear ratio comparisson

I have been studying about Torque and gear ration in another discussion Torque and RPM calc, and I received good answers that make me go in-depth into this topic. To understand it better, I want to ...
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0answers
5 views

Does the coefficient of force for a built rocket engine change with chamber pressure?

So I understand that the force coefficient (force/thrust/nozzle thrust, whatever you want to call it) is a function of chamber pressure, or more specifically nozzle stagnation pressure, according to ...
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0answers
15 views

Question with regard to spacex raptor engineand other full flow staged combustion engines

The diagram linked is unofficial but I've looked at other diagrams which are similar. The coolant is pumped in at a high pressure much higher than the maximum chamber pressure of the rocket the ...
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2answers
45 views

WW2 technology - How was this on-screen frame counter added to old film-media footage?

Please refer to the following youtube video (pause it as soon as it starts)... "USS William D Porter, the Unluckiest Ship in the Navy" by The History Guy https://youtu.be/f9Gb4PakFTU?t=162 There is ...
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1answer
36 views

Is there an industrial process that makes use of photosynthesis?

When I was in school, photosynthesis was taught as this amazing biological process that took light and water and turned carbon dioxide into oxygen and carbon. It was implied that this was limited to ...
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1answer
32 views

algorithm to compare items in a set

Let's say that I have $14$ regular matrices of order $4$. I'd like to compare the data of each matrix with all 13 others to see if there's a match Is there an algorithm that can accomplish this task?...
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3answers
63 views

How to get corrugated plastic roofing strips to span 3m for rainwater exclusion experiment without building additional ground supports?

I'm trying to build structures to exclude some percentage of rainwater on experimental plots. I have three 20ft beam supports across the plot, spaced 3m apart and held in place by 4x4 posts that were ...
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0answers
10 views

Measuring of waviness

Can I use the optical microscope to measure waviness of steel cutted by abrasive water jet, if this is possible which software I can use?
2
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1answer
104 views

Why/when is AC-DC-AC conversion superior to direct AC-AC conversion?

I am currently studying wind power and the power electronics used for it. In wind power a generator is driven by wind, thus the resulting power is of widely varying frequency and amplitude. The power ...
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1answer
48 views

How can a non flowing fluid have kinetic energy?

I am currently studying engineering thermodynamics from Cengel and Boles and there it is given that total energy of non flowing fluid per unit mass basis is given as $e=u+\frac{v^2}{2}+gz$.But if the ...
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0answers
21 views

Is it possible to calculate torque using strain gauges on a rotating shaft?

I am currently designing a torque sensor and am looking into the ability to use strain gauges as a instrument to measure strain and calculate torque. The current setup is two motors connected via a ...
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1answer
15 views

Swiss File #4 Alternatives

I want to buy a "Swiss File #4". I visited some local stores but noone knew what that was. I found this nice set of files. Can someone read what it says in the top? Is some of these file equivalent ...
2
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2answers
54 views

Why don't we use hot water instead of steam to drive the turbines?

I guess if we do this then, the size of the turbines could become smaller. The condensor's size also might be reduced. But the catch over here is the energy density of hot water is less then that of ...
3
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3answers
100 views

Torque and RPM calc

started by designing the gear meshing, and now I need to calculate some parameters to determinate if this meshing works for me. The system considers an electric motor, which technical parameters are: ...
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0answers
27 views

How can I setup a controller simulator in excel?

Is there a good excel program somewhere or basic breakdown of how to implement a control loop in excel if trying to simulate the performance of a circuit? I have data from an operating plant and am ...
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0answers
34 views

Can e-paper capsules be made larger in size?

Can I buy individual (larger in size) e-paper capsules from somewhere? (for an electronics project for example) and is it even possible for such large e-paper capsules to be engineered?
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0answers
10 views

How to add a level to component hierarchy in Fusion 360?

Fusion 360 has the "browser" (tree structure) and timeline to represent the CAD model. When I realize I should have created a parent component for an already existing component, how to do this? In ...
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1answer
23 views

Measuring Torque in a bicycle [closed]

How to measure torque in a bicycle? how much newtons will produce by the pedal of the cycle ?
0
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1answer
20 views

Beam column joint reinforcement

Why cant we provide the bars cross bent in the beam column joint...as the cracks are all diagonal...so inorder to avoid cracks why cant we provide the bars crossed in the joint instead of providing ...
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1answer
36 views

Fluid Mechanics - Fluid flow

I have answered the following questions, however I’m unsure if they’re correct. 1.) For this question do we consider gravity force, I have used it but I’m not sure if this invalidates my overal ...
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0answers
9 views

Are dynamic frequency transmitters common? What's the terminology to use when searching for one?

Newbie question, moderately educated on RF but only the signal, not at all about the hardware. Looking to start experimenting on a concept that would require a dynamic shift over time from one ...
1
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4answers
61 views

Wind turbines with down tower power units. Why aren't they more common?

Concerning the big megawatt wind turbines, if there is such a big trouble with gearbox bearings failing much earlier than expected and costly maintanence or replacement of huge gearboxes, what is ...
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votes
1answer
46 views

Dimensions of a bar when it is subjected to axial pull

Determine the change in dimensions of a rectangular bar of length 2 m, width 200 mm, and thickness 100 mm, when it is subjected to an axial pull of 20 kN in the direction of its ...
1
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0answers
23 views

Maximum allowable crack in Post Tension concrete

What is the maximum allowable crack size dimension in a post-tension concrete slab before it is considered a "structural" crack, in Arizona, USA? Is there a certain standard for this. I have tried ...
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0answers
11 views

Efficiency of pump on VFD?

If I'm replacing a control valve with a VFD for a centrifugal pump, how do I predict the pump efficiency? I've got a pump curve which tells me my pump's efficiency at at a given flow or a given dP ...
1
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0answers
22 views

DC motor Magnetic axis of armature winding vs EMF

When considering the cross section of a DC motor we have: I notice that the Magnetic axis of the armature winding is aligned with direction of the EMF that will cause the rotation. Is there a ...
0
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0answers
24 views

static and kinetic friction force required to tow a train

Today I saw a youtube video of an All-Electric F-150 prototype towing 1 million+ pounds. It's towing a train on railroad tracks. How much force does it take to get the train moving? Once the train ...
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0answers
37 views

Grad student needing help with a fluid mechanics issue in project

BROUGHT OVER FROM PHYSICS STACK EXCHANGE As the subject states I have hit a wall in a fluid mechanics associated problem in designing an experiment for my grad project. Long story short, I'm an ...
2
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0answers
23 views

Flux Cored MIG on unknown steels, what is this stuff?

Welding on some unknown Steel, I made the weld, and this stuff formed. It looks like a fast shutter speed shot of smoke or something for me but it's a solid material that has formed. It almost seems ...
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2answers
54 views

What is difference between lift and elevator and hoist?

I am very confused by the three terms:lift and elevator and hoist Are they all technically same thing or different??
1
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1answer
13 views

Typical cycletime of an industry pid controller for servomotors

I am wondering the following. What are the typical cycletimes (or timesteps), that are used in real industry-standard pid-controllers (for example for assembly-robots on a car-production-line). I ...
1
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2answers
70 views

What happened to the projectile in Hypervelocity Impact tests?

I recently saw a tweet about Hypervelocity Impact Sample and someone ask how is it possible to shoot a projectile at that speed and what happened to the used projectile when hitting the shield. I ...
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0answers
12 views

What non-Gaussian filter should I use

I am developing a filter to better predict my state of my system. I had previously tried an Extended Kalman Filter. I have all the data needed to predict my next step but I have few observations/...
0
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2answers
53 views

I've never seen this type of flexible coupling, can someone tell me what it's called?

Putting together a project, I've found this clutch but I've never seen this type before. It has a sort of flexible plate connecting the two parts, attached to both in two places corresponding to where ...
0
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1answer
20 views

Best reactor for solubility-limited reaction?

I have a reaction where component X is required to react with formic acid producing a solid precipitate. The main problem is that component X has very low solubility in formic acid and the reaction ...
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0answers
13 views

Calculate vector analyzer measurement error

How can I find vector analyzer transmission and reflection measurement errors? I use Agilent 8753ET vector analyzer, its datasheet may be found here.
2
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0answers
20 views

What is the effect of ageing on preconsolidation pressure?

Preconsolidation pressure is the maximum effective vertical overburden stress that a particular soil sample has sustained in the past. How far in the past does the soil remember its loading/the ...
2
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0answers
25 views

Health hazards of disassembling electronic devices?

I´ve been disassembling a lot of electronic devices in order to recycle them, separating plastics, electronic boards and bolts/other metal parts. Is there any proof of health hazards for doing it ...
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0answers
19 views

Tool to simulate sensor data

Say I have a light source at a distance of 1Km from a light detector (photo detector). Right in front of the sensor, I keep a rotating reticle with some sort of pattern. To better appreciate the ...
0
votes
1answer
20 views

Carefully attaching Pt-wire to mild/carbon steel surface

Problem: I have a near 100% Pt wire (25 AWG / D ≈ 0.45mm) that I would like to attatch to a cold rolled steel (E235 / EN 1.0308) surface. Assume this surface is flat. Goal: Keep wire attached to ...
0
votes
1answer
14 views

Sound level emissions (IEC 60704-1) spectrum?

I have a very noisy air conditioner that have a 10kHz peak at 75 dB, the rest (fan/compressor/pump) are under the regulation limit. I would like to understand what is the measurement spectrum. I ...
0
votes
1answer
24 views

Weight distribution roof construction

How do I calculate the maximum force on a support beam if I know the weight of the roof? I assume distribution will be even but I cannot find correct formulas. For example: 3 beams 60cm apart ...

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