# All Questions

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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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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, ...
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 ...
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 ...
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. ...
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 \label{eq:1} ...
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, ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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. ...
51 views

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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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?
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 ...
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 ...
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....
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 ...
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 ...
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 ...
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?
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 ...
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. ...