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9 views

What plastic material is best for a snap-fit design?

I'm designing a plastic holder that will secure a metal part with snaps. Which plastic will be able to take multiple removals and re-insertions without getting weaker (bent out of shape) over time? [...
0
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0answers
5 views

What type of engineer/professional designs hydroponic farms?

What kind of professional/architect/engineer builds agricultural systems, specifically automated hydroponic systems? Things such as growing, cultivation, lighting, plumbing, harvesting, processing ...
0
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2answers
29 views

NASCAR corners on public roads

Why don't engineers build highways with corners such those on NASCAR speedways?
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0answers
11 views

Phrase to describe products that meet “test for” standards?

Often in the case of safety related products - My example is EN54 Fire detection and fire alarm systems. For a product to say that they comply with this standard, the product has to be tested and ...
0
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0answers
10 views

At which stage can borate solutions be injected to metallurgical coke?

Borates are effective to increase CSR of metallurgical cokes so that can be added to the metallurgical coke in the process, which place is best for this belching process? Coke ovens? Coke ovens (...
0
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2answers
20 views

Mounting an antenna base on a roof using only double sided tape?

I want to put a vertical antenna on top of my roof. The antenna is basically 4 meters of PVC pipe and 5 meters of 19mm aluminium tubing. The roof at my house is corrugated sheet metal, and I want to ...
0
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0answers
17 views

Safety of a 4inch wall

One of my house's wall is 4inch wide. My house has one room . and other is lobby that is fully covered by roof. Its wall facing the outside road is 9inch in width. But one wall of it facing to our ...
0
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0answers
13 views

Determining the minimal needed wall thickness between two bores in a control block

Given a control block of simplicity with only two bores. These two bores could be parallel or just could be very close to each other at a specific point in the control block. The material of the ...
0
votes
2answers
23 views

Why do we analyse frequency response for step inputs?

In my class I'm in, our lecturer presented frequency response methods such as the nyquist plot and bode diagrams. Then when designing a lead compensator later, he said one of the specifications should ...
0
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1answer
23 views

Why do pitching machines use wheels and not solenoids, actuators, servos or peumatic cylenders?

I guess that generating movement is harder then keeping a wheel rolling, but in terms of power consumption is it possible to compare the power consumption of a motor for driving wheels to that of a ...
-1
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0answers
27 views

Refute this wtc argument?

A wtc size plane impacting a 100m2 area would have under 100mpa of force. Isn't that irrelevant? Is the fire more important than the impact?
1
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1answer
25 views

What is the manufacturing method used to make aluminium C channel

I don't know how this is made and I don't know the name of the method to search for it to learn more.
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0answers
33 views

Is this space elevator idea plausible?

https://imgur.com/yU8ttVq A better Space Elevator idea: Here is my revised space elevator idea. This variation of the space elevator concept solves the flaw in most designs because it doesn’t ...
0
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1answer
30 views

Orthogonal to Orthoradial reinforcement

Most of finite element calculations are performed with an orthogonal mesh (Cartesian coordinate system). From this calculation, we get two values of required steel area per linear meter: $Ax, Ay$ ($cm^...
0
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1answer
38 views

How much rain water run off do I need to power an LED greenhouse

My question essentially is how much water to power green house LED lights. Specifics bellow : Say I have a warehouse with a flat roof with a bunch of water tanks or the whole thing being a water tank....
0
votes
1answer
22 views

Consequences of Inextensibility of an in-plane line in Euler-Bernoulli Beam Theory

The Euler-Bernoulli beam theory is based on the hypothesis that the beam deforms such that a straight line normal to the beam axis before deformation remains inextensible straight normal to the beam ...
0
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1answer
20 views

Arc subtended by stretching of a conical spiral spring

I'm trying to work out the angle subtended by the stretching of a conical spring and I have a solution but I'm not 100% sure about it so would appreciate some feedback. An Archimedes spiral spring is ...
0
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0answers
22 views

How to obtain transfer function of servo?

I am using a servo motor and controlling it via arduino. Servo motor is part of a control system and I have to use System Identification techniques in order to obtain the servo's transfer function. ...
0
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1answer
39 views

Difference between perpendicular and transverse loads?

What is the difference between perpendicular and transverse loads? I saw this on a forum for 3d printing, but I couldn't find any online explanations on what the difference between both measures of ...
0
votes
1answer
25 views

How to read the block diagram for the 2nd order integrator feedback system?

This is a prework for a lab, I haven't seen things in the picture before and have no idea on how to transfer this to an equation.
0
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1answer
21 views

Headlight auto-dimmer in newer cars

My RAM truck has a feature that intrigues me and I want to know how it works. In auto-dimmer mode, the truck will automatically put on low beams headlights when there is on-coming traffic at night, ...
0
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1answer
31 views

Is it possible to cast copper around another metal

So i have seen these super conductor rods around (which appear to be copper around titanium/niobium). Now I am wondering (for a maker usecase) if its possible to create something similar by for ...
0
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0answers
15 views

Problem with relative reference frames

I came across this problem a while ago and I'd like to solve it, but I'm not even sure where to start. How would I start this problem and what formulas do I need? I'm not asking for a solution, but ...
0
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0answers
16 views

How do I get the closed-loop transfer function of the system, fitted with a PID controller, if the input valve has a transfer function?

How do I get the closed-loop transfer function of the system, fitted with a PID controller, if the input valve has a transfer function given by: $ \frac{Q(s)}{P(s)} = \frac{Kv}{(Tv*S+I)} $ Where Kv ...
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0answers
14 views

How to plot the response of the open-loop system when the input discharge suffers a unit step variation using LabView?

The open-loop system is a tank of water connected between two valves. My transfer function is $ \frac{H(s)}{Q_i(s)} = \frac{R}{A R s + 1} $ My time constant is $ {Tau(T)} = {A R} $ I know how to ...
1
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0answers
25 views

How to derive a value from a transfer function

I have a scenario where a valve q_in(t) is pumping water into a tank of height h(t) and area A, which is then pumped out by a second valve q_out(t) that has a resistance to water flow R. I got this ...
1
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0answers
27 views

How to calculate load on roller to create given deflection?

I am trying to calculate what loading on a fixed roller will create a predetermined maximum deflection. I ran some calculations, but the values I'm getting are significantly lower than I would expect. ...
3
votes
1answer
129 views

What are the meanings of `B.C. 3/8“` and `6-11/32”`?

I'm totally ignorant in this area, and probably didn't know how to properly google my question - sorry.. I found this specification here: (https://si.shimano.com/pdfs/ev/EV-RH-IM10-2045B.pdf). My ...
0
votes
1answer
17 views

Fluidic muscle in reverse, as a pump. Does this exist?

A fluidic muscle is a pneumatic or hydraulic actuator, consisting of a flexible tube. When the tube is filled with a working fluid (pressurized air or hydraulic oil), it balloons out and shortens. In ...
0
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0answers
27 views

Please,i am not sure if it is a bearing defect , could someone help me?

This pump has shown high vibration level on axial orientation (pump side). The picture represents velocity spectrum on horizontal. Some peaks matches BPFI. I had no training on vibration analysis (...
0
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0answers
20 views

Euler's equations of rigid body motion

I am trying to come up with a mathematical model of a miniature crane arm. In most of the resources that I found online, I find that the approach is using Euler's equations. My understanding of using ...
0
votes
1answer
26 views

How can I calculate the power and torque required for the motor on a wheeled robot/vehicle?

How can I calculate the power and torque required for the motor on a wheeled robot or vehicle if a particular acceleration or movement up an incline is required?
2
votes
1answer
41 views

Is it a good idea to intentionally discharge lithium batteries to 80%

Manufacturers recommend keeping lithium batteries between 40 and 80 percent charged. I tried, but sometimes I let my phone get higher than that. Then I try to bring it down soon as possible, either ...
3
votes
1answer
31 views

Calculating the required motor for a mobility scooter

I need to calculate the required motor for a mobility scooter with the following user requirements. The mass of the scooter with passenger = 120kg Max Speed of scooter = 9Km/h ...
0
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0answers
30 views

Structural Analysis of an RC plane in flight

I am working on structural analysis of an RC plane in a symmetrical maneuver. There are two types of loads on the structure a) aerodynamic loads and b) inertial loads. I have determined the ...
0
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1answer
18 views

Are there steam tables for subsaturated steam?

By Googling I can find basically two types of steam tables for water. They are either saturated steam tables, which I understand are for steam in saturated state. Here pressure are temperature are ...
0
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0answers
26 views

How to shape sheet metal like Willys hood latch?

I am want to produce Willys' hood latches like links below Hood latch link 1 Hood latch link 2 Hood latch link 3 What kind of metal shaping process is this? Even I could not figure the mold out.
0
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0answers
10 views

Who was the ANSI certifying authority for Titus CSE ear muffs?

Titus CSE claims to have achieved certain NRR ratings with ANSI for some Titus ear muffs. How can we verify their claims? I looked into this, but I cannot find the ANSI certifying authority for ...
0
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0answers
24 views

Second Order Elastic Analysis

When analysing a structure using traditional methods (e.g. Hardy Cross, Slope Deflection, Force Method, etc.), it is a first-order elastic analysis. My question is, how would one analyse a statically ...
0
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0answers
30 views

Advance Stirling radioisotope generator powered by Pu-238 feasibility [on hold]

I want to make an Advance Stirling Radioisotope Generator (ASRG) (based on Plutonium-238). For your information, ASRG is/are powered by a sterling engine(s). Please answer the following questions: - ...
-1
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0answers
30 views

Fluid Dynamics: Question and understanding help

I've just started learning Fluids and have been given an assignment of which I want to make sure I'm right before I hand it in. If it's possible, can you member of stack exchange please have a ...
2
votes
1answer
29 views

Is there such a material that is resistant to torque while easily stretching when under torsion?

I need a shaft that can be stretched along its length while also being resistant to torque enough to be a functional shaft (see pictures). I have a rotating sphere within another rotating sphere, ...
2
votes
1answer
41 views

Can a sensor tell the difference between gravity vs. acceleration?

Are the effects of gravity and acceleration identical to the point that no sensor can tell the difference?
0
votes
1answer
16 views

Simplest software for making 2D and 3D visualizations(animation),

I have to do simple visualization or animation of movements for simple hand prosthesis. There are no validation or calculations required. I just want to show concepts working principles (movements ...
0
votes
2answers
18 views

Maximum spans in multi-level building

Is it possible to build a building with 3 levels, with the 2nd and 3rd levels having areas with clear spans (no columns) of 130 ft length and 85 feet width? There can be columns outside of this clear ...
0
votes
0answers
11 views

How to model the thickness of a liquid film between two flat surfaces?

Say there is a flat surface with a liquid drop in static equilibrium exposed to the atmosphere. Another flat surface [eg:glass surface] is place on top of the liquid drop and pressed down with an ...
1
vote
0answers
19 views

What is the difference between $K$ ,$K_{IC}$ and $K_t$?

I have seen three representation of stress concentration factor values $K$,$K_{IC}$ and $K_t$ now all that I know is $_I$ in suffix represents opening mode of crack.The suffix $t$ stands for tip....
0
votes
1answer
34 views

What is the voltage at the ground electrode of a spark plug?

Since the voltage required to bridge the gap between the central electrode and the ground electrode of a spark plug can reach up to 40 000V and even more, my question is, how does the battery not die ...
0
votes
0answers
20 views

gear design.improving gear strength

For improving the gear strength, which one is better based on manufacture and economy? Increasing module or increasing N? With the same surface strength.
1
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0answers
18 views

P-N junction depletion region

Before I explain my problem I'd like to mention I'm still green and about 2 weeks into these topics. I learned most of it from youtube videos, wikipedia and other science sites, so I'll be explaining ...

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