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23 views

Maneuverability calculation of a catamaran ship with azimuth thruster?

In a competition about ship prototype performance, my team decided to make a small catamaran ship with azimuth thrusters. This competition was originally about speed contest but due to COVID-19 it was ...
2
votes
1answer
118 views

What is the maximum force needed to move the roller block from point A to point B and where does that maximum force occur?

Hello everyone. This project is for a very specific application and I am trying to determine the force necessary to get the block from point A to B. Specifically the maximum force necessary and at ...
3
votes
4answers
68 views

Rotation around an axis outside of the mechanism

I want to design a system of linkages that will allow me to rotate the green element around the blue point/axis without entering the red circle. The green triangle to go fully around the blue point. I ...
0
votes
1answer
20 views

Pump Terminology: Suction Piping vs Suction Waterway

Karassik and McGuire state in their 2012 book, [1] p. 415, The available energy that can be utilized to get the liquid through the suction piping and suction waterway of the pump into the impeller is ...
0
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2answers
40 views

How do I connect multiple water-filled syringes?

I'm trying to connect 4 separate syringes containing water and we need water-tight tubing to prevent water from leaking out of the system. The water would theoretically need to be pushed out of one ...
0
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0answers
19 views

how to obtain solution of this bessel equation using Frobenius method

Given this equation: $$ \frac{1}{r}\frac{d}{dr}\bigg(r \frac{dT}{dr} \bigg) - \bigg(\frac{2h}{bk} \bigg)(T-T_a) = 0 $$ I can let $x=r\sqrt{(2h/bk)}$ and $z=T-T_a$ to obtain the bessel equation using ...
0
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0answers
41 views

Purpose of TV Towers at Present [closed]

We know that different communication towers exist around the world(e.g. Tokyo Tower). They are not only used as a TV tower but for radios and touristy purpose too. This is the age of dish antenna, ...
0
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0answers
15 views

What is a suitable machinery for sample preparation?

A large scale steel analysis laboratory requires a machine to remove top layer of imperfections on steel lolly pop samples. Machine to be robust, low cost consumables to be used, safe with sample ...
2
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0answers
42 views

What is the use of secant modulus?

Secant modulus is defined as the slope of a line connecting the origin and a specified point (like yield point) in stress-strain diagrams. Instead of elastic modulus, which is the slope of the tangent ...
0
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1answer
37 views

Can I use loadcell for vibrating force measurement?

Is it possible to use a load cell to measure a force that is vibrating? The idea is to measure that force that is getting into the load cell in a sweep of frequencies and vibration is NOT a noise. ...
1
vote
1answer
27 views

Fixed end points optimal control problem

Given two points $(t_0,x(t_0)=x^{0})$ and $(t_1,x(t_1)=x^{1})$ in the $(t,x)$ plane, the objective is to find an optimal trajectory $x^{*}(t)$ such that the cost function \begin{equation}\label{eq:1} ...
1
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0answers
14 views

Passively Controlled Heat Exchanger

I am currently working on designing a heat exchanger that "passively" controls temperature. Just for a little bit of context: By passive, I want to limit any use of regulating valves, ...
0
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0answers
49 views

What type to mechanical joint to achive Slide then Rotation motion

I have two parts (Green and red fixed) i want to connect them with a joint (Blue) that permit the green one to slide outwards then rotate. Side View (Right part) a simple pivot point doesn't work ...
1
vote
1answer
52 views

Is a MSC Adams simulation with smaller steps always more reliable?

In a given simulation in MSC Adams, if I use a 1 or 0.1 step increment, I get the (favorable) result I intuitively assumed would occur, but if I use step increments of 0.01 or 0.001 a different (and ...
0
votes
1answer
58 views

Can be used a lab on a chip device as a nuclear fusion device? [closed]

This is what a lab on a chip is https://en.wikipedia.org/wiki/Lab-on-a-chip I ask if could be used as a nuclear fusion device , that could rise the number of nuclear fusion per atom, knowing that ...
1
vote
1answer
30 views

Transfer function into block diagram and matrix form

I'm reading a book on Control System Design and running into the same issue I had in Kinematic Design. When things are presented in a format without any numerical examples it just appears as gibberish ...
0
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3answers
41 views

Why is there a difference in the deflection between the top and bottom of this truss?

In this truss scenario, why is the deflection of point 3 less than that of point 8? I'm assuming it has something to do with the shape of the truss. If we extend the shape we will get a circle and the ...
0
votes
1answer
39 views

How to estimate the tensile strength of inch diameter steel round?

The tensile strength for 1045 TGP Precision Steel Round is said to be 91 ksi. Although, different diameters must be a factor, right? Would a 1" diameter rod be 104.5 ksi or 1045 ksi? Say I want ...
0
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0answers
15 views

When 2 liquid-vapor chambers are connected at different temperatures, how do I determine what the pressure will be?

Hi all. I have 2 chambers initially filled with liquid and vapor (could be water and steam). The one side is then heated until all the fluid evaporates and becomes either fully vapor or superheated. ...
0
votes
1answer
51 views

Shouldn't linear time-invariant systems be called affine time-invariant systems instead?

For a scalar $c$, the function: $$f(x) = cx$$ Is linear in that it satisfies the superposition property. If: $$f(x_1)=cx_1$$ $$f(x_2)=cx_2$$ Then: $$\alpha f(x_1) + \beta f(x_2) = \alpha(cx_1)+\beta(...
0
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4answers
71 views

Swing safety: maximum load of beam (supported at one end, free with load on the other)

My husband and his dad built a fort for our two boys. Coming off of one side of the fort is a 4x6 wooden beam with a tire swing attached at the end. It is supported on one side by the fort, but not ...
0
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4answers
71 views

What kind of pump not limited by atmospheric pressure?

Most pumps like centrifugal pumps are limited by atmospheric pressure. This is because the pump simply create a vacuum where the atmospheric pressure pushes the water into it. Hence there is a limit ...
-1
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2answers
33 views

Why radio communication was limited to military use and did not become popular with general public like cell phones have become today? [closed]

Why did no private company or government try to bring radio communications to general public like we have cell phone today? What were the hurdles and challenges?
1
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0answers
15 views

Why is CGNS not used in CSM?

The CGNS format appears to be only applied in CFD (computational fluid dynamics). Why is it not applied in CSM (computational solid mechanics)? Is there any technical reason? The hierarchical ...
0
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0answers
18 views

FreeCAD - Scale object from command line

I want to be able to scale an object from the command line. Using the GUI i go and load the STEP file, and select "Draft Workbench". This is the code generated so far (that i am able to see ...
0
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0answers
22 views

Will the below discussed system also require a heat recovery mechanism?

I recently read an article regarding compressed air energy storage systems. One thing which was mentioned there was that the overall efficiency of a compressed air system can be as low as 10-15% if ...
1
vote
1answer
48 views

Does the aerodynamic force qualify as a viscous damping force in the Mechanical Harmonic Oscillator

When reading about a harmonic oscillator, the most common form of damping is proportional to the velocity. $$F_D = c \;\dot{x}$$ Without giving much thought to viscous damping, one example I always ...
-1
votes
1answer
36 views

How to plot bending moment diagram from shear force diagram

With conventions that I adopted shown below I drew roughly the shear force and bending moment diagram of a simply supported beam with concentrated load at the middle. Now while drawing I drew both ...
-1
votes
2answers
31 views

Please explain engine thrust and aircraft weight

This is probably really easy for someone... But... My non-engineer head just cant seem to get an answer to this question in terms that are simple to digest. A new Boeing 777X has a max take off weight ...
-1
votes
1answer
37 views

Optimal placement of two support points along a wooden beam

Assuming a beam that is supported at 2 points as per attached image, what would be Lc (length center) and Lo (length overhang) for maximum strength. (or load bearing capability) For actual material ...
2
votes
2answers
49 views

Is it practical to use tensile cables in a composite beam?

Many composite beams combine material that has a good tensile strength with material that has a good compression strength (like concrete and rebar). I was wondering if there has ever been a beam that ...
-1
votes
1answer
28 views

Is molecular dynamics relevant for an undergraduate Mechanical Engineering degree? [closed]

I am completing my final year undergraduate study in Mechanical Engineering. I've had to have a scope change because my last project was not going to work with the pandemic. I've been given a project ...
2
votes
0answers
21 views

I'm looking for the simplest way to increase rotational speed from 120 to 5,000 rpm for a light duty device

I'm currently designing a device and want to increase speed from 120 to 5,000 rpm. Device is lightweight, hand operated, free spinning, low torque in/out. Picture a cheap fertilizer spreader from Home ...
-1
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0answers
34 views

Would it be safe to use a cutting wheel in place of sand paper on a disc sander?

Assuming I had the cutting wheel centered and adhered correctly, on a bench mounted disc sander with a 14" disc. Could I then use that disc sander as a modified grinder? I don't see a problem ...
0
votes
1answer
28 views

Configuring UART Port to 115200 on Renesas RX130 using Code Generator

Does anyone have insights into configuring UART port on Renesas RX130 microcontroller for a bit rate of 115200? I have successfully configured for a 9600, 19200, and 38400. I can read from the MCU and ...
-1
votes
3answers
90 views

How do AC/DC Adapters (Wall Wart) prevent AC Noise Coupling to DC?

I am wondering if AC noise (EMI) gets coupled to the DC side of the AC/DC adapter, what are the design methods used to isolate AC noise getting coupled to DC output in an AC/DC adapter. What are the ...
3
votes
2answers
37 views

Low pile capacity during pile driving

When driving piles, the resistance from the soil is constantly measured. What happens when the expected resistance values from the soil are not obtained? For a single pile or for multiple piles? What ...
0
votes
0answers
31 views

Marine engine firing orders

For a while, I was curious as to what the firing orders for inline 7 and inline 9 engines were. I was able to find them in datasheets like this one, which is a project planning guide for the MAN 35/44 ...
-1
votes
2answers
26 views

Help understanding AC circuit voltage division math in frequency domain

I don't fully understand the section b. How does the math in fhat voltage division equation work out to be 200 ang(-113.13) volts?
-1
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0answers
17 views

Arizona Calibrations Constants

I was reviewing this report on Implementing M-E in Arizona and found that the proposed local calibration constants for the fatigue damage model are extremely high. The bottom-up equation is shown ...
-1
votes
1answer
35 views

Estimation of Beam Displacement from Acceleration

Hi Engineering Exchange, I have a beam with pinned-pinned boundary conditions (free to rotate but not free to translate). A legacy computer analysis provided me with the maximum mid-span acceleration ...
-1
votes
0answers
36 views

I need help with my ESP8285. It completely stops working after a few days

I had gotten a few ESP8285s from Adafruit because I wanted to make my own 4 channel WiFi relay board. I had created a PCB for it, I have 4 relays, the ESP8285, a 28V power supply, a 5V regulator and 3....
1
vote
2answers
55 views

Simple clarification about EV charging

After reading some docs about Electric Vehicles (EV), I learned that there are 4 differents charging modes. For example, let's consider a slow recharge, where EV is connected to a single-phase ...
0
votes
2answers
25 views

How to constraint with objects out of sketch plane?

I would like to constraint the centers of two rectangles to be exactly across the part central axis (shown in the middle of cylindrical hole) Is it possible? Rectangles should be as wide as circular ...
-1
votes
1answer
23 views

How to get rid of out of context references in Solidworks?

I got some sketches to have questionmarks. I found, that it means "Out-of-context external reference" I don't understand what it means and wish to get rid of it. Repair does nothing, rebuild ...
1
vote
1answer
35 views

Replace Hydrogen in an air cylinder

Can we use a gas cylinder made of A6061, meant to carry air up to 300 bar, with Hydrogen up to the same pressure? If not, what is the maximum pressure that one can safely use hydrogen with?
3
votes
1answer
37 views

Arduino DAC to Speaker

I'm working with an Arduino Due's two DAC pins. I want to output to a single 4W 5.7Ohm speaker to test my code, with the intent of eventually outputting to a set of speakers (woofer, mid-range, and ...
0
votes
2answers
60 views

Looking for dropping servo mechanism idea

My friend and I have an idea to make prototype of vending machine. We need suggestions for making strong dropping mechanism. The idea is: The user orders X item. Let's take a can of cola for example. ...
0
votes
2answers
52 views

Python for mechanical engineers [closed]

I'm a mechanical engineering undergraduate student and I want to start learning python. There are lots of online courses (free and paid) on the web but I don't know which is the most useful for a ...
1
vote
2answers
39 views

What function does this device perform better than a flat, horizontal bench?

I am curious to understand the engineering and design principles behind this device, which I will refer to as the half-assed rest, because it seems to be an inferior design of a normal chair or bench. ...

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