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21 views

Finding the Initial Launch Velocity of a Ball Whose Launch Angle is Known and Trajectory Contains a Given Point (Accounting for Air Resistance)

I am working on a project that involves launching a ball through a basket (similar to basketball, but on a smaller scale for now). I haven't started building the project yet as I wanted to work out ...
-1
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0answers
17 views

Best way to raise a platform while keeping it level?

I am looking at building my dad a shopping cart since he has balance issues. I am thinking of trying to make it have a moving platform able to support about 50 pounds of groceries(I am kind of ...
0
votes
2answers
49 views

Regarding design of a compressed air delivery system based on a screw air compressor

I want to select a screw compressor for my application wherein I need a pressure of about 18 psig, and 300 cfm at the aforementioned pressure. The compressors I'm finding suitable for the system have ...
-1
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0answers
27 views

Reflected Mach number derivation

when learning about reflected waves, I keep coming up with this equation; $$\dfrac{M_R}{M_R^2 - 1} = \dfrac{M_S}{M_S^2 - 1} \sqrt{1 + \dfrac{2(\gamma - 1)}{(\gamma + 1)^2}(M_S^2-1)\left(\gamma + \...
-1
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1answer
19 views

What does OilMarketCube mean?

I don't understand p 24 of this PDF from Rystad Energy. Can someone please distinguish, and ELI5, 7 ((Crude supply (current OilMarketCube, downside risk)) and 8 (Crude supply (with required shut-ins ...
-1
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0answers
23 views
+50

How do I interpret INVERSED working capacity on the negative y-axis?

I don't understand p 24 of this PDF from Rystad Energy. I ask about 1 ('Available crude working storage capacity (inversed)') and 2 here. I'm guessing that Rystad Energy graphed 1 and 2 with negative '...
-1
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0answers
16 views

Why are accelerometer readings treated as inputs and not part of the state in Kalman Filters for IMU/GPS Navigation?

I am working an IMU/GPS navigation system. I am starting from the ground-up with the state space equations that describe the system. I am finding that all references are treating IMU acceleration ...
-1
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0answers
16 views

What does the term “Acquisiton” mean in systems engineering perspective?

I have been reading a book known as Systems Engineering : Principles and Practice - Alexander Kossikoff , the author uses the word acquisition several times and I fail to understand what he actually ...
-1
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1answer
20 views

Ideal Exhaust velocity of a rocket nozzle

In a youtube video, they defined exit exhaust velocity of a rocket nozzle as $$v_2 = \sqrt{\dfrac{2k}{k - 1}RT_1 \left[1 - \left(\dfrac{p_2}{p_1}\right)^{(k - 1) / k}\right]}$$ How can I derive this ...
1
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0answers
17 views

CO2 probe measuring at temperatures up to 150 °C

I'm looking for a $CO_2$ measuring probe (analog current output, digital out: RS232/485 - probe will be connected and transferring real time data to the data logger) that would operate up to 150 °C (...
1
vote
1answer
22 views

What are the characteristics of a motor that will generate current and is powered by a 30 cc, 2-stroke small engine?

Problem: I am trying to hobby-build a generator using a (old, working, throw-away gas, yard blower) 30 cc, 2-stroke engine. The 2-stroke engine will spin a motor and I want the motor to generate DC ...
1
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1answer
14 views

Efficiency loss for a cooling element for cooling parts smaller than the cold plate

I would like to cool a small device, with a size of 45x45 mm² and a thermal load of ~40 W. Currently, I have a cooling system available, capable of cooling a thermal load of 52 W, and a cold plate ...
0
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0answers
13 views

Fitting a gaussian shaped nozzle into check valve piston?

So, for my downhole hydraulic internal cutter tool, I have the following parts: Top sub, body, piston, nozzle, O-rings, knife pins, knives and a bottom sub. I am trying to use a gaussian shaped ...
2
votes
0answers
26 views

How do I calculate Pressure drop across relief valve and then force on piston?

So, I'm designing a basic downhole hydraulic tool cutter of an OD = 5 1/2 in., and my tool contains a relief valve and a piston. I am trying to calculate pressure drop across the relief valve so that ...
2
votes
1answer
52 views

What is the technical name for temporary construction fences?

My structural engineering friend and I passed a construction site years ago, and he called those temporary fences a technical name. Now I ask him the technical name he said those years and he doesn't ...
1
vote
2answers
65 views

Is there well known equation (formula) to calculate maximum practical current which copper wire of fixed diameter can handle

I found many online calculators or tables which can give maximum current for the wire. Like 1 mm diameter can handle up to 10 Amperes, 2 mm diameter wire can handle up to 30 Amperes, etc. Is there ...
-1
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0answers
23 views

Need help with an essay question related to chemical engineering (High School)

I have to do an essay question related to an area of my choice (Chemical Engineering). Could anyone suggest an area of research that is accessible to a High Schooler within ChemEng? Thank You
1
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0answers
24 views

What glue would be suitable for adhering a space blanket to Plywood?

I've been doing a hobby project, creating a parabolic solar reflector to heat up a pipe of flowing water. I did this by cutting a stack of parabolas with a CNC router and secured a thin piece of ...
-1
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3answers
36 views

Need help regarding working of drum brakes

I was learning about the working of drum brakes, and I came to know, that each of the two brake linings of drum brake apply horizontal force in opposite directions. That confused me, because, if ...
-1
votes
0answers
24 views

protecting linear actuator from damage

that might occur during the stone cutting process. I need to move that stone cutting disc up and down very accurately. Will the reel in the scheme help any with isolating the linear actuator from its ...
4
votes
0answers
35 views

Conservative rebar dowel hole sizing and embedment depth

My question concerns the hole sizing and embedment depth of post installed rebar which is secured with epoxy mortar into a hole in a reinforced concrete slab. Hole diameter sizing My assumption #1 ...
2
votes
1answer
62 views

Help understanding a control system represented by coefficients of theta?

I've been working with control systems and transfer functions recently, but I've come across a format that I haven't seen before using coefficients of theta, and I can't find any information about it. ...
-1
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2answers
22 views

How to determine the new position of a support if the beam is shortened (moments question)?

I am having trouble with this moments question: A force F balances a 6m long, 100kg uniform beam at A. The beam will be shortened in length by 2.5m at B. Determine the new position of support A that ...
-1
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0answers
8 views

Can we use aquastat in hydronic systems in place of thermostat to control room temperature?

I have seen some people use boiler and circulator aquastat solely to control their hydronic system in order to achieve proper room temperature. they set boiler aquastat 10 degrees higher than the ...
1
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1answer
22 views

how to create rounded edges on box using Autodesk Inventor? using overlayed plastic

the wood texture is an overlay, underneath is plastic If sanded it takes the face of the plastic off. Im looking to round the sharp corners. the idea i'm working from now is using the same sharp ...
-1
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0answers
15 views

Analysing frames in 2D enough when there is symmetry?

When we have a structure which is similar from bay to bay, is is enough to analyze it in 2D? But then what about earthquake analysis when we have to consider the earthquake force from two orthogonal ...
1
vote
0answers
12 views

Optimal Control Singular Arcs

This is about linear time-invariant, stationary problems. According to Donald Kirk's book Optimal Control Theory, for minimum-fuel problems on page 299, I was told that if there exists a singular arc,...
0
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0answers
28 views

Skew-Symmetric Gain Matrix to Encourage Exploration

I am reading a paper on controls and it has the following snippet: We propose to use the control law $$u_i = K(CV_i − p_i)$$ , where K is a (potentially time-varying) uniformly positive ...
-1
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0answers
21 views

How to calculate the vertical effective stress at the middle of a clay that is sandwiched between two layers of sand?

The following is the question: A layer of silty clay 5.2 m thick with unit weight 18.6 kN/m3 is sandwiched between two layers of sand, each 4 m thick with unit weight 17.3 kN/m3. The water table in ...
16
votes
6answers
5k views

Why do oil tankers heat crude oil?

About all those oil tankers off the coast of California … | Grist The giant ships burn fuel to keep lights on, power equipment, and heat the large volumes of crude oil resting in their tanks. I'm ...
5
votes
1answer
32 views

Why would a specfication for a motor require that overtemperature protection be realized by modeling heat generation and not with an embedded sensor?

I'm reading the procurement documents for the R211 railcar contract, which is for electric multiple unit subway cars designed for rapid transit applications in New York City. The railcar's propulsion ...
0
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1answer
30 views

Why are tank cars cylindrical?

Hold height constant. Then a Rectangular Prism, with length and width = radius of the cylinder, has greater volume! So why aren't tank wagons (railroad vehicles that transport gas and liquid) ...
0
votes
1answer
42 views

How can I create a small pump that can pull fish to a higher elevation without killing them?

(for the record, I already attempted to ask this in the physics stackoverflow) I'm attempting to create something similar to a vertical multi-siphon. The device would pull water from multiple sources,...
-1
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2answers
40 views

How far can we compress air manually?

I am not sure if such devices even exist, but I'm sure we can improvise. A device in which we could (manually) turn a shaft, screw a screw, or hammer an air-tight follower into a strong walled ...
1
vote
0answers
15 views

What are the hypersonic Normal shock relationships?

I am learning about hypersonic flow now and there seems to be a lot of discussion about the oblique shock relationships as the Mach tends to be very large. I was wondering what happens to the normal ...
-1
votes
0answers
5 views

Two model compare c2m histogram output reading in cloud compare

I have saved the data from histogram by c2m by this kind : So it excel it shown as this type: Also seen this question, so i know the class is the class color number (0-255 for rgb), and i guess ...
2
votes
0answers
22 views

When calculating a car's suspension caster, after turning the steering wheel 20 degrees, why multiply by 1.5?

To calculate caster of one side of a vehicle, the steering wheel is turned 20 degrees to the left, and the camber is obtained; this represents the 'in' value of the front right tire. Then the steering ...
1
vote
1answer
16 views

Determine compressive modulus from compressive strength data in spec sheet?

Is it possible to determine the compressive modulus of a polyethylene foam using the following spec sheet? Minicel Type M Foam It doesn’t contain any information regarding the compressive modulus, ...
1
vote
1answer
18 views

Fixed-Free End Column Design

I am currently working on a problem where I have to design a column. The structure I am currently designing currently takes the following form, When designing the column, I know that I have to ...
-1
votes
0answers
17 views

Why are the hallways/public areas of apartment complex buildings always so “echo-y”?

Ever since I was a child, I've always been annoyed by and confused about why all the stairs and hallways on the way to an apartment, inside various buildings which hold many apartments, are always so "...
-1
votes
0answers
14 views

How to calculate beam rotation value under torque with displacement results?

I'm trying to plot a Torque rotational curve with results generated using FEM software, how do I calculate the rotation(in rads) value from it? In my model, the forces were applied to the beam in a ...
-1
votes
0answers
7 views

Magnetic Dipole Moment Measurement

I am interested in measuring the Magnetic (Dipole) Moment of a piece of HW. Is there any source where I can find a procedure to do that? Thanks a lot.
0
votes
1answer
30 views

Degree of Freedoms in a Node of a 3D Frame/Beam Element

I recently took a quiz for my Matrix Methods of Structural Analysis Class, in which I encountered the following MCQ. My answer of '6' was justified, in my opinion, by the size of the stiffness matrix ...
-1
votes
1answer
12 views

Cloudcompare Cut at specific coordination by one reference cut (third part of question)

according to these two previous question: Cloud compare Cut at specific coordination by one reference cut and : Cloud-compare Cut at specific coordination by one reference cut (second part of ...
3
votes
1answer
20 views

What does the Torque vs Frequency plot mean for a stepper motor

I found this motor which I believed had interesting specs, but when I checked out the data sheet, the torque-speed graph was replaced by a torque-frequency graph! I do not know what it means. How does ...
1
vote
1answer
19 views

Calculating force transferred from pinion gear to rack

I am really challenged as I need to fit a bunch of motors in a 6" box acting as linear actuators. I was looking for linear actuators (most I found were brushed DC) at first but the ones I found that ...
-1
votes
0answers
7 views

Max temperature that can produce saturated vapor

I am trying to find the specific enthalpy of saturated water vapor at 500 degrees Celsius, but all of the tables I have seen only go up to 373 degrees Celsius. Is this the maximum temperature that can ...
1
vote
1answer
33 views

What is the specific issue with frequency fluctuation in the grid?

I understand that if supply and demand are not in equilibrium synchronous generators make the difference by increasing or decreasing their rotational energy - thus changing the electrical frequency in ...
1
vote
1answer
25 views

Solving for stiffness matrix numerically by a set of measurements

Is it in general possible when you have a mechanical structure (in this case I am referring to the structure in this post) and you want to determine the global stiffness matrix of this structure, to ...
1
vote
1answer
18 views

Stresses exerted by cutlery on a cylindrical utensil holder

What forces of torsion, compressive stress, and tensile stress are exerted by cutlery on a cylindrical utensil holder? Also lets suppose that the holder is tightly packed. Is there a maximal tensile ...

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