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2answers
24 views

LAN data from computer

I have an HMI (Siemens MP 377) to print collected data on a LAN connected printer. Now I would like that the data that are being sent to the printer is also received at a computer through Ethernet LAN....
0
votes
0answers
13 views

Should I use ST or LT values for extruded rod?

In MMPDS for AA7075-73511 (extruded rod) the Table 3.7.10.0(g3) show both ST and LT values for transverse directions. For a rod with circular cross section there is really no Short and Long transverse ...
0
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0answers
44 views
+50

USB solenoid valve driver (<1A) with hit and hold

Hi I'm looking for a USB controllable (or less ideally a serial interface of some other kind) solenoid controller that can switch up to 8 small (<1A) solenoid valves with hit and hold*. The best I ...
4
votes
0answers
24 views

How does humidity, specifically using a humidifier, affect the filtration of PM2.5 particles from a room?

I live in a very smokey and dry area where people are advised to use air purifiers. Since it's also dry I'm curious what affects, if any, adding a humidifier to a room with an air purifier would have? ...
1
vote
1answer
29 views

Gaps in derivation of thermodynamic property equations

If $h=h(T, P)$. Does $ dh = c_pdT + \left[v - T\left(\frac{\partial v}{\partial T}\right)_P \right]dP \Rightarrow h_2 - h_1 = \int_{T_1}^{T_2} c_pdT + \int_{P_1}^{P_2}\left[v - T\left(\frac{\partial v}...
0
votes
0answers
13 views

Units of the Von Karman Energy spectrum?

The three dimensional Von Karman spectrum is defined as $$\phi_{ww}(k_x, k_y, k_z) = \frac{E(k)}{4\pi k^2 } (1-k_z^2 /k^2)$$ where $$\begin{align} E(k) &= \frac{55\Gamma(5/6)\bar{u^2}}{9\sqrt{\pi}\...
1
vote
0answers
21 views

How does NASA's QueSST X-59 jet work?

The QueSST (Quiet Supersonic Transport) is a project to create a more diffuse sonic boom in order to use supersonic flight commercially without the usual abrupt 1~2 psf pressure spike damaging the ...
0
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1answer
29 views

Tensile Strength Of Concrete For RCC Structure [closed]

In the design of R.C.C. structures, what should be the tensile strength of concrete?
0
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3answers
47 views

How to compute heat produced by 2.5kw heating element

Lets say the following is limited to 2.5 kW only and the thermostat and flow switch failed during use. After water is boiled away and bit of steam released. What would happen to the heating element ...
0
votes
0answers
30 views

Advice wanted on time to digital converters for speed of sound in fluids

I'm using the speed of sound to analyze the composition of aqueous solutions with sound velocities between around 1000 and 1400 meters per second. It's a process control application with continuous ...
0
votes
0answers
10 views

How to obtain the spectral reflectance of a whole object?

I am interested in the colours of an object in a natural light environment. Specifically, I am interested in obtaining spectral reflectance data (i.e. the particular light wavelength(s) reflected of ...
0
votes
1answer
18 views

Velocity inlet boundary condition in Ansys Fluent

Ansys Fluent offers a very simplified version of boundary conditions. So if I know the velocity at the inlet, I need not care about pressure and vice versa. What I am having trouble with is that I ...
0
votes
0answers
28 views

Random page missing on printer

I am trying to print from HMI (MP 377) to HP M402DN printer on LAN. HMI collects data at 10 seconds interval and when data of around 7 minutes in accumulated, sends to printer for printing. In this ...
1
vote
1answer
38 views

How to get a transfer function from this block diagram?

Pardon my paint skills, I did my best My attempt is short and seems to fail, I have no idea why: $$\begin{align} \alpha &= in - a_{1}\beta - a_{2}\gamma \\ \beta &= \alpha z^{-1} \\ \gamma &...
0
votes
0answers
18 views

How do I determine the pitch/roll stability of a buoy?

I am designing a loosely-moored spar buoy (large height relative to width), and the equipment on top needs to remain as vertical as possible while floating in the sea, within limitations of buoy cost, ...
0
votes
1answer
13 views

What is the difference between objective and derived requirements? [closed]

How do you distinguish between the two categories of requirements when you’re writing them?
0
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0answers
21 views

at what point is increasing pressure ratio diminishing in returns?

piston engines of ww2 planes had pressure ratio of at least 10, while jet engines were still vastly superior with a pressure ratio of only 3. Certainly pressure ratio of 1 would bring 0% fuel ...
4
votes
1answer
25 views

How were the tones for DTMF chosen?

In my limited engineering knowledge, and limited research skills, I couldn't find a complete answer for the reasoning behind the chosen tones for DTMF. I did find a hint that said something about ...
0
votes
0answers
5 views

I am getting an error - “Input must be an integer between 0 and M-1.” while trying to design the baseband part of a simple SDR

I have used a Bernoulli Binary generator has my input which I have then sent through an FIR Interpolator with a factor 2. The signal is then sent through an AGC (Automatic Gain Controller) and then ...
0
votes
0answers
21 views

How to calculate toque of quadcopter motor (specificaly convert force to torque)

I would like to get out the coefficient that is part of the calculation of the torque of a quadcopter $Torque = w^2b$ (equation); so far i have built a stand like in the image below. Then I tried ...
0
votes
1answer
23 views

Are tetrahedron spaceframes strong versus flex?

I am considering how a spaceframe would work as a rigid batten in a sail. Tubes are most often used, so I can't imagine this would be cost effective; it's mostly a thought experiment. I'm not a ...
0
votes
1answer
27 views

Help with scaling torque and forces?

I am currently designing a ground based digging drill, that hopefully will be accepted by a commercial entity. I am currently working on the preliminary design of the robot and am hoping to move to ...
1
vote
4answers
47 views

How to calculate Average temperature from area under the curve?

Let us say I have a graph of temperature against time for a material as shown here. I want to calculate the average temperature. Will it be simple mean of the curve or rms of the curve? Edit: The ...
-1
votes
0answers
36 views

Rough Calculation of Bag Filter Dedusting System Gas Usage?

I tried to roughly calculate N2 gas usage(gas consumption of dedusting systems) of industrial bag filters (dedusting systems) but I can't get accurate results from the measurement: I think by Delta P ...
0
votes
0answers
18 views

Calculating young's modulus of a metal from compressive stress and strain curve?

I know that young's modulus is rise over run of the curve in the elastic zone. But what do you do if the the curve is for a ductile material under compressive load, which has no clear yield point or ...
0
votes
1answer
41 views

Initial shallow gradient in measured stress strain curve

What's causing the initial shallow gradient of the stress strain curve of ceramic in this graph? The rest of the curve is a straight line alright until the yield point. Edit: the material being tested ...
2
votes
1answer
44 views

Determining the final surface temperature and final gas temperature flow through a tube in a room

I am trying to calculate the final temperatures as stated above. There is hot gas flowing through a tube that is insulated and inside of a room (no wind). I will try to walk you through my thought ...
1
vote
0answers
16 views

Limit state design/ LRFD of short steel columns

Why do we use the yield strength as the limiting strength in short column design when using limit state design. Why is the full capacity of the material not utilized (as is the case with beams when we ...
0
votes
0answers
13 views

Do fuzzy logic controllers create a model of a system?

I know model predictive controllers require a mathematical model of a system to operate, and fuzzy logic controllers do not. If I define a set of rules for a fuzzy logic controller, a control surface ...
0
votes
1answer
23 views

Schematic of a resettable thermostat

You can put 2 or 4 or even 6 pcs of this in series to make sure at least one will work or open if it reaches say 55 degree celsius, right? And there is no resistances to consider when its close and in ...
0
votes
0answers
32 views

Failure analysis of a rod [closed]

A mechanical system is designed as over here. Loads applied on the system are as follows: F = 10 kN; P = 450 N; Q = 950 N. The material of the main rod has an ultimate tensile strength of 400 MPa, ...
0
votes
0answers
17 views

Signal convolution: continuous signals

I really didn't understand how to do it. Please, can anyone help me?? Determine h (t) * x (t) when h (t) and x (t) are the rectangular pulses shown in Fig. A. Plot the result of this convolution. I ...
0
votes
1answer
41 views

Determining the torque needed for a servo motor

I'm looking for a bit of clarity on a design I have in mind. Please bear with me as I have no background in physics, engineering and this is part of my first real DIY project, so the knowledge base ...
0
votes
1answer
17 views

Other than yielding, what type of stress you check for ASD?

ASIC 360-16, in page pdf 330, it says "For any single element, there may be a number of different allowable stresses that must be checked." I can think of yielding. What else? Rupture for ...
0
votes
0answers
10 views

In what cases we use both LRFD and ASD approaches in structural analysis?

In what types of situations we use both LRFD and ASD for the same structure? I of course do not mean a single analysis using both at the same time by mixing them. I mean, two separate analysis, for ...
0
votes
1answer
48 views

How to know the material of key-top?

There are keys (push buttons) on the front panel of an avionics device that fits inside the aircraft cockpit. I need to know the material of which those key-tops are made from. I can guess the ...
1
vote
0answers
12 views

Shadow flicker validation

I am currently trying to validate a shadow flickering algorithm against some data generated by Openwind. The goal of this validation is to have a code that we know that is correct and modify it to ...
0
votes
0answers
23 views

Boeing 747 Autopilot PID Controller

For a personal flight simulator project, I am creating my own custom Boeing 747 classic series. I have about 50% of the project complete at a level of detail nearly equivalent to study-level flight ...
2
votes
4answers
98 views

How to divide the water flow into outlets with equal flow each?

I'm designing a machine that uses water to boost fish in one phase of a process. My main concern is how to split the water flow that I get from a water pump in to $N$ outlets with same flow rate. The ...
0
votes
1answer
30 views

Rack and pinion drive for cart

I'm trying to solve a design problem involving the dimensioning of a gearmotor that drives a rack & pinion system to move a cart. The cart weighs 600 kg and is supported by 4 V-shaped steel wheels ...
1
vote
0answers
18 views

Shear modulus in terms of 2 Young's moduli and Poisson ratio

I have two moduli, EY and EZ, and the poisson ratio NUYZ, and the equation for the shear modulus that I am using is $G = \frac{EY*EZ}{EY+EZ+2*EY*NUYZ}$ but I am not sure where it comes from. I tried ...
0
votes
0answers
25 views

how to make closed square structure stable

i want to make this structure stable so i can use flexibility method to calculate deflection of Point B this structure is 4 times indeterminate so i need to delete 4 variables from it ( example ...
0
votes
3answers
102 views

What is inside this heater flow switch?

Here is the mystery. In the following youtube video you can see the pin of the flow switch diaphragm extended when the faucet is flowing (the valve is after the flow or pressure switch). https://www....
1
vote
3answers
44 views

Can an empty aviation fuel tank blow up

At the end of the James Bond movie View to a kill, the aeroplane runs out of fuel - both the propellers stop and the plane glides. There are holes at the bottom of the tank so all the fuel has ...
1
vote
1answer
87 views

Beam for shop gantry

I have a small machine shop and need to size a beam for a gantry crane. The design is a 4 post fixed design with 2 horizontal beams running parallel across the shop ends with 1 beam to be mounted ...
0
votes
0answers
22 views

is there a hard castable ceramic i could use to make an engine cyllinder?

Im thinking of building a model piston engine. Since i don't have machining equipment i will need to cast it out of something. Melting metal requires some equipment (i tried melting aluminium in a ...
0
votes
1answer
40 views

Is there any way to conserve energy for the following scenario of lifting weight?

A pulley can be used to provide mechanical advantage while lifting weight. Suppose a combination pulley is made such that in order to lift something four times heavier, one can use the same force but ...
0
votes
2answers
37 views

Is it true that pre-jet air planes used to fly much lower? If so, why?

I watched a video on the Concorde the other day. In it, they talked about the history of airplanes, and how the jetplanes now started flying "above the weather", and that the propellar-...
0
votes
0answers
15 views

Is it possible demodulation wield more than one set of signals?

Suppose I have two signals, s1 and s2. Then I use modulation (Fourier Series) so I spread the compound signal through a media (wire/air). Then, while demodulating the compound signal, am I sure that ...
0
votes
1answer
19 views

Capacity credit vs capacity factor

What is the difference between capacity factor and capacity credit? I know that capacity factor = annual generation / (installed capacity * 8760) but I don't understand how capacity credit is ...

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