# All Questions

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42 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 ...
29 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.
37 views

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, ...
33 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 ...
17 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 ...
22 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 ...
17 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 ...
32 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 ...
31 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. ...
139 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 ...
24 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 ...
29 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 (...
21 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 ...
33 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?
44 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 ...
58 views

### Working out Motor torque

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 ...
36 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 ...
30 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 ...
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.
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 ...
54 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 ...
31 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, ...
46 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?
27 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 ...
29 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 ...
12 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 ...
26 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....
35 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 ...
22 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.
20 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 ...
13 views

### Nonlinear behaviour of control plant and adaptive or robust design

In a paper in the context of controller design for DEAP actuators I came upon the following sentence: Furthermore, the nonlinear behavior of the control plant requires either an adaptive or a ...
19 views

### What's the most anisotropic material? Is there a dense stiffness matrix?

The stiffness (aka. tangent modulus of the stress) can be represented as a symmetric 6-by-6 matrix, i.e. it has 21 independent components in the most general case. In the linear case, this matrix is ...
47 views

### Why do these piers have a height miss-match?

I found this image of 2 piers of a Grider bridge with varying height. By any change could this be part of the design? The bridge is supposed to be a flyover for traffic decongestion.
48 views

### Determining Support Reactions

I have a statics problem that I am running into some difficulties with. What is being asked here is to determine the support reaction at the points A and C. This would normally be no problem, but when ...
21 views

### Max torque given in engine specification is indicated torque or brake torque?

I want to calculate brake torque from indicated torque for motorcycle.
32 views

### Double-bagging problem: which bag on the inside?

If you're double-bagging some groceries, and one of the bags has tears in it while the other is intact, which bag should go on the inside?
27 views

### Trying to reduce RPM of a combustion motor

I'm trying to reduce the rpm of a combustion motor. It operates at 2000 rpm with 3HP, and I need it to work at around 12 rpm (no matter the power). I've made the math with sprocket and chains, but the ...
20 views

### What practically is constant volume heat addition in SI piston engine? [closed]

Isochoric means constant volume (In SI engine: piston should not move when the spark is ignited). In reality piston always keeps displacing up and down means volume changes. So, how does this make it ...
29 views

### Silicone paste vs. silicone grease vs. silicone spray lube

For purposes of usage in home/auto and light industrial circumstances, what are the differences? What are the pros and cons, and suited uses, of each? Thanks!
26 views

### Is it possible to spot weld three rather than two plates?

I have a situation where ideally, I would like to resistance spot weld three rather than the usual two plates together (individual plate thickness approximately 0.7mm). Is this at all possible? If not,...
16 views

### What material characteristics are most important for heating element material selection?

I want construct a heating element by screen printing a flat coil pattern of conductive paste onto an insulated substrate. This conductive paste consists of a powder of conductive metal contained in a ...
52 views

### Why do we get singularities in a solutions while modelling a physical systems?

I wonder why do we get some times singularities (position to be infinity or velocity to be infinity) in the solutions while modelling a real system and in spite of taking all real parameter values of ...
37 views

### How can thin wire in generator windings carry the high output current?

I observed the rebuilding of a 12KW, 120V gas-powered generator. I was amazed at how small the generator portion was (roughly the size of an electric motor you might find in a major home appliance). ...
41 views

### Hydraulic linear actuators as CNC axis instead of screws

Lately I've been watching some videos on machining and hydraulics as it always interested me. I was toying with the idea of building a budget CNC mill with threaded rod for the axes, but the issue of ...
24 views

### Force applied to a cam follower

Hello I am a simple rock climber, and would like to figure out how much force is applied to The lobe of a cam/the rock when the cam is loaded. So the cam lobe is circle the ramp or cam goes from 7/16”-...
27 views

### what is the most optimal cost effective diameter of a hyperloop tube ferrying ALL cargo between the US and EU [closed]

what is the most optimal cost effective diameter of a hyperloop housing vacuum tube housing hyperloops that can ferry ALL cargo currently travelling by air and sea to and from the US and Europe? ...
37 views

### Statics Two Force Member Problem

I was given a challenge question from my teacher that I need some assistance in solving. The problem is to merely identify the two-force members. I understand the ideas of how to determine a two-force ...
12 views

### FOPDT model identification

So I'm trying to identify the model of a simple system (I'm pouring hot water (m [kg/s] into a water tank and displace the colder water inside) in order to tune a PID controller. I performed a doublet ...