# All Questions

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5 views

### How to implement a PID temperature control modifying flow rate

I am trying to heat water to a given temperature using forced convection in a hot copper pipe. The problem I ran into was that I controlled the flow rate given by a pump, and when the temperature ...
12 views

I worry my diagram bending moment or Shear Force Diagram I have drawn is wrong So I have problem like the picture no.1 show and have solved then get reaction support (Ray & Rby) on The picture no....
10 views

### Hydropneumatic issue

Could you help me by giving me examples of a task that was left to me. Design a hydropneumatic system for the actuation of transversal and longitudinal movement, applicable to a three-step precision ...
16 views

### Strength of Retangular Steel Tube

I have a retangular steel (A36) tube that is 2x6 inches with a 5/16 inch wall and 11 feet long. Can it center lift a 5000 pound weight attached evenly to its endpoints? How much deflection will ...
10 views

### Relationship between antenna length and wavelength in radar

This is a question about radar design and how it works, because I'm trying to figure out some elements that are unclear to me. My understanding so far is that to detect an objet with a given size, the ...
• 161
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### Comparing reactor volume to achieve 95% efficiency for a CSTR and a PFR

Compare the reactor volume required to achieve 95% efficiency for a CSTR and a PFR for the following conditions: steady state, first-order reaction, flow rate =14 m^3/d and a reaction rate coefficient ...
• 1
25 views

### Which position on a vehicle is least effected by the steering?

I am looking to position a paint sprayer for longitudinal lines on the roads. The plant I have is three wheeled the single wheel is at the front and dual at the back. It has the options to have the ...
23 views

### Between black and white plastic bag, which one is better to conserve hot and cold respectively?

I want to sell online fresh food and drink, something like in the picture. The food is newly cooked, so it is hot. While the drink is iced, so it is cold. The food mostly will be eaten during lunch ...
54 views

### Reactor with mixing and a cooling jacket

Suppose we have a reactor with mixing that contains a known quantity of water at $121^{\circ}C$ (due to the pressure, the water is liquid). We want to cool the water to $37^{\circ} C$ by using cooling ...
26 views

### Engineering Statics

I have attached an image of the question (both parts). In part (a), I found the tension in both cables but could not find the force in the tower AO. I also need help with part (b). Thank you!
32 views

### Determine appropriate BBQ temperature for steak

I'm working on estimating the necessary BBQ temperature to heat a 500-gram steak from 5°C (straight out of the fridge) to 50°C in one hour. Here's a brief overview of the problem: Problem Description: ...
18 views

### Need reliable release mechanism in tight space where activation is hitting a pin on the bottom of the shaft and the lock released is on top of shaft

(see screenshots for more detail) I'm an ME AE and I have this project for my kid. I have a tight space of only 5mm x 5mm x 81mm cut into the side of a shaft. The mechanism activates a release by ...
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19 views

### Why don't Steam-Methane Reformers have pilot burners?

Reformers like other fired furnaces burn fossil fuels usually naphtha or natural gas to provide the heat required for the reaction (steam-methane reforming, in this case). However, unlike other fired ...
16 views

### How to do maths for total gear ratio to predict 3D printed high torque high reduction planetary mesh generator?

I found a video of a guy lifting wheels and anvils using a 3D printed gearbox, so I've found a mesh generator that can rapidly produce custom gears based on that design. I found a math walkthrough ...
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40 views

### How to find the image of an object in case of a tilted spherical mirror?

Problem A lens is used to obtain real image of a point(/small object) at $(75,0)$. This acts as the virtual object for a convex mirror of radius of curvature $100cm$ placed at $(50,0)$ tilted at $30°$ ...
10 views

### Problem with model constraints in ANSYS mechanical

I've been trying to run an analysis of the geometry in the attached images. The geometry consists of an inner tube with protrusions along an axis (this axis is not parallel to the Y axis) and an outer ...
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### Thermo Hydraulic Mechanical modeling of energy wall slab in camsol multiphysics

I am currently working on a complex simulation project involving an energy wall slab, and I need assistance in accurately modeling and validating it using COMSOL Multiphysics. Here are the details of ...
16 views

### How can I calculate the required motor torque to push a weight of approximately 15 kg?

I am working on a machine where I need to push a material weighing around 15 kg. The system consists of a motor and a ball screw mounted on the same axis, connected via a coupling. The ball screw has ...
34 views

### How to geometrically derive stress transformation equations from Mohr's circle?

Consider the simple case of a 2D stress element with its corresponding Mohr's circle: Now, for stress transformation using Mohr's circle, we rotate the diameter AB by twice the angle of rotation of ...
13 views

### The Heat Generation and heat flux both in General Heat Conduction Equation

How would I incorporate both heat generated within and element and heat flux from external to the element in GHCE. For example, Let there be a thick wall of thickness 'L', with internal heat ...
29 views
+50

### Mutually incompatible MagLev standards?

As magnetic levitation (MagLev) train systems have been developed since the 1980s, I have a question of What standards used in MagLev train systems would make two MagLev lines mutually incompatible? ...
1 vote
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### What is the Hoop stress and bending moment relation

So I am working on a club telescope project. I have to design the tube for the telescope. So I found hoop stress to be most critical stress. The tube's bottommost end has a mirror and a mirror cell. I ...
22 views

### rigidity angled steel vs aluminum

I would like to find out the difference of flexing between angled steel vs angled aluminum of the same dimensions under load. Is there a straight-forward way to calculate / simulate this? The size I ...
7 views

### LID Design - Layout and Concepts

I have a general but important question regarding LID design. I work as the only civil engineer at my company, and I have rarely used LID design in my projects. I am trying to familiarize myself with ...
19 views

### Making Silicone Rubber Surface Conductive

Hey Engineering Community, a physicist this side. I am tinkering on a project where I need a local deformation of the thin sheet(0.2mm thickness, 25cm*20cm dimension); pressing on the surface from one ...
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29 views

### What are effective anti-corrosion coatings for high carbon steel springs?

In trampoline design, the most common springs have a total elongation of about 60% of rest lengh. E.g. a 10" spring can be stretched to 16" indefinitely without deformation. These springs ...
27 views

### Can supersonic flow be achieved without converging diverging nozzle?

Can supersonic flow be achieved without the presence of a converging diverging nozzle if sufficient pressure difference is available? https://www.tomshardware.com/desktops/pc-building/an-ordinary-...
36 views

### Why are there no UPS power supplies that use an external Automotive battery for storage?

What I've learned: A: UPSs generally use sealed lead acid batteries, which use a slightly higher voltage to charge. Using an auto battery will result in the battery being in a slight state of ...
1 vote
18 views

### Aluminum tube deflection

We're designing a new start bar for the Harris Hill Ski Jump in Brattleboro, VT. It's the bar the jumper slides out to sit on as he/she awaits the okay to go. Will the tube specs below be sufficient ...
17 views

### Hoe functioneert de Blum-methode in detail?

i dont understand how the method of blum works can someone explain it to me if you are dutch it would be a big help although english works aswell.
35 views

### Warehouse aisles and ramp requirements for pallet hand trucks

Are there any regulations for warehouses that define maximum slope and minimum aisle lengths for moving pallets with hydraulic, manual pallet jacks? Given a ramp that was designed for wheelchairs, I'm ...
20 views

### Are mutli-story structure slabs poured on-center?

What exactly does it mean to have a multi-storey building where each storey is 2.4 meters? I've read a lot of descriptions of buildings that say each storey is "2.4 meters" or "3 meters&...
42 views

### Running utilities into bomb shelter / bunker

In peace and disaster time, bomb shelters are utilised for living spaces. Hence, what are some considerations for drilling through the reinforced walls to run utilities such as water, petrol, ...
32 views

### How is the city power grid routed and connected to individual locations such as houses?

I'm an electrical engineer but I don't know enough about the power distribution grid or civil. I'm no electrician either. My initial question is how does a new construction, like a home, get safely ...
27 views

### Fixing problem with simple brushed DC motor not moving

I was following a tutorial for a brushed motor (this one: https://www.youtube.com/watch?v=NbcJvGk72HY), and it spins. However, there is a problem when the coils of the stator is directly parallel to ...
16 views

### How to check if a USB conector is broken

Suppose we want to check that usb port is working. we can do the continuity test with a multimiter.We connect the positive part of the multimiter to positive part of the connector and we do the same ...
1 vote
22 views

### Single millinewton strain gauge suggestions

I am working on a project where the precise & accurate measurement of single millinewton forces has become a significant boundary. Is there a cost effective device that is able to measure such ...
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26 views

### Fixture to hold and deliver current to crystal cathode in vacuum chamber

At my internship, I have a small crystal (about 5-8mm long by 2-5mm thick) that needs to be mounted in a vacuum chamber (which is 35mm on the inner diameter) to serve as a cathode with 1.0 to 1.5A of ...
21 views

### Cataloging the History and Genealogy of Innovations

I have a curious and unusual question for y'all. This question is mostly philosophical about the field of engineering trying to understand itself. (Disclaimer: I am a student of medicine, biochemistry,...
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16 views

### Normal Weight of RC Beam

Is 450kg/m for a reinforced concrete beam outlandish? The dimensions are: width: 0.3m depth: 0.6m I am designing a beam, and that is what I got.
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33 views

### Do transfer function changed in vertically placed spring damper system when an additional mass is added

Title: Calculating the Transfer Function and Displacement for a Spring-Damper System with Additional Mass I am working on a problem involving a spring-damper system, and I need help with calculating ...
20 views

### Finding Static Conditions from Total conditions

I am trying to create a code which determines the static properties of a flow given the total (stagnation) conditions, plus an area and mass flow rate. Since the velocity and as an extension, the mach ...
39 views

### What is the formula to define the flexural strength of an upright cylinder?

I have been making cylindrical concrete coasters and, for fun, have been seeing if my friend's can snap them. Every subsequent mix design I'll change the mix itself or the dimensions of the geometry ...
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28 views

### Continuum Model

I came across the continuum model when I was studying thermodynamics from the book 'Thermodynamics: An Engineering Approach' Are we motivated to apply the continuum model because, when we view a ...
20 views

### In what practical use case would you choose to incorporate multilayered bearings i.e. bearing within a bearing?

Considering every aspect of engineering like durability, efficiency, cost vs service-life and all the possible mechanical issues, Is there any practical advantage in using multilayered bearings? What ...
15 views

### How quickly does water accelerate over a spillway?

I'm designing an emergency spillway for a basin which has broad-crested weir that's 10' wide and 3:1 side slopes. From HydroCAD, I know that the flow rate over this weir is about 12.65 CFS. Using the ...
1 vote
30 views

### Find the equivalent resistance between the points $A$ and $B$

In the figure shown below, find the equivalent resistance. I know I should add my attempt but I don't know how to approach these type of problems. This isn't the standard series-parallel combination ...
15 views

### Dimension does not appear in Denavit-Hartenberg formulation

Consider the robot and Denavit-Hartenberg table in the picture below The revolute axes of the robot intersect. Positive direction for the first revolute joint is to the right and that for the second ...
16 views

### Battery thermal loss

A copper bus bar is subject to a short circuit current of 500 A for 10 s. The section of the bus bar, through which the current flows, has a length L = 50 mm and a cross section of A = 20 mm^2. ...
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