# All Questions

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### Modulus of Rigidity (Shear Modulus) of string

Does anybody know of what magnitude should the Modulus Of Rigidity of a wool string should be? I know that neither wool or string are "materials" but if anybody can give me a rough estimate of a value ...
1answer
21 views

### How to form steel truck fenders

I want to set up steel truck fenders production line, but have no idea how to do that. Something like this picture.
0answers
9 views

### Simufact / MARC and Fortran

I am using Simufact from MSC Software to perform numerical simulations. To be able to create my own sub-routines I need to have Fortran compiler installed. Simufact manual mentions only Intel Fortran +...
1answer
28 views

### Assessment of steel beam for lifting to Eurocode 3

A client wishes to use an existing steel beam to lift a 1 tonne load using a sling. The 3 m long beam is measured as UB 203x133 visually observed at both ends to be secure with end-plates with all ...
0answers
20 views

### effect of coupling in MIMO systems

I have a MIMO system with a 2x2 transfer matrix, for example consider: $\begin{pmatrix} \frac{2}{s+1} & \frac{1}{(s+1)(s+2)}\\ \frac{1}{(s+1)(s+2)}&\frac{2}{s+2} \end{pmatrix}$ I would ...
1answer
21 views

### Electronic symboles in datasheets

I found these symbols in a electronic datasheet.. Are these all logic gates? or another?
0answers
9 views

### video converters that convert LVDS,HDMI,MIPI to DisplayPort? [on hold]

are there any all in one video converters that convert LVDS, HDMI, MIPI to DisplayPort?
1answer
21 views

### Electronic component datasheet handling

What is VIH And VIL in datasheets? I found High-level input voltage and Low-level input voltage on the datasheet?
0answers
13 views

### Chemical Kinetics

Consider the following consecutive, second order, irreversible reactions are carried out in a batch reactor: A + S Yield(k1) X X + S yield (k2) Y One mole of A and two moles of S are initially ...
2answers
44 views

### How to calculate the moment of inertia of a worm gear?

Should I consider them as a cylinder to find their inertia? Any tips will be helpful.
1answer
34 views

### Plate thickness for repair of completely corroded web

The web of a H-section column has been completely corroded at the air-moisture interface with the concrete encasement leaving a hole in the web. The proposal is to break out the existing concrete and ...
0answers
9 views

### Why in paper space of AutoCAD 3D are colors of object shade not displaying

I am using AutoCAD 2016. In model space, I draw a colored 3D object. Then I made an isometric view of that object in the paper space (layout page). In the 'Appearance' section of 'Drawing View Editor' ...
1answer
22 views

### VTOL Aircraft Take-Off Mechanics Question

These question(s) could be potentially trivial, but its difficult to find visuals on CFD of VTOL aircraft. While watching a video of the f-35 performing its vertical take-off/hovering, I noticed the ...
2answers
29 views

### I'm looking for a way to keep a wire coiled when it's not being pulled on, and retract when it isn't

I'm working on an application where a panel rests on a flat plane, and is hinged along one edge with a bit less than 90 degrees of travel. I need to run a wire from the flat plane to the edge of the ...
0answers
24 views

### Need help identifying this three-layer diverging diamond-style interchange

I'm an avid fan of Cities: Skylines, and it has occurred to me that one of the types of interchanges that seems to fare very well with the simulated traffic is this three-layer diverging diamond (...
1answer
50 views

### Electric engine and transmission

What kind of automatic transmission would be the best to connect an electric engine with the rear axle of a RWD car? Specifications: 200HP, 3000rpm electric motor top speed 220km/h The automatic ...
1answer
36 views

### Center of rotation (rigid body)

I know the meaning of (instantaneous) “center of rotation” and “center of zero acceleration” for a rigid body. I know that they do not coincide (in general) and that their positions change with the ...
2answers
50 views

### Pin joint system displacement question

A pinned system comprising bars of the same material and cross-sectional area is subjected to a vertical load P. I am required to form a relationship between FAB and P. The first part of the ...
0answers
17 views

### How to calculate the two parameters in the red box about Required ventilation rate and Calculated CO2-loss?

I dont know how to calculate the two parameters.I think The total energy of the light is 700w/m2*3600s=2520Kj,then I will not do it.
0answers
3 views

### User Defined Scalar (UDS) and Species transport, in Fluent

What is the difference between UDS and species transport in Fluent?. I know UDS is for a passive scalar and species transport can simulate the chemical reaction during flow. So what is the difference ...
1answer
28 views

### How do you determine the L/D ratio of F-117 Nighthawk?

I was trying to look for an L/D ratio published everywhere on the web and I can't seem to find it (for a project). Since I couldn't find it, I wanted to try calculating myself. Can't seem to find $C_l$...
2answers
20 views

### Is there a way to calculate mass flow rate of an axial compressor?

Is there a rule of a thumb equation for the mass flow rate of a stationary axial compressor at sea level, using intake area and RPM? Or do other factors like blade geometry make too much of a ...
3answers
48 views

### Why is the Bush of a motor not replaced with a ball bearing?

Ball bearing reduces friction to a large extent than sliding friction. Motors use a metal ring called bush which slides against the shaft when the shaft is rotating. If a force is exerted on the shaft ...
2answers
22 views

### How to reduce tilting in self-made gimbal

I made a gimbal at home with PVC. Used some cement filled PVC pieces as hanging weight to make the phone steady. But when I shoot with it, I feel some tilting movements in the video due to the ...
0answers
33 views

### Calculate Power for pump

I did a Civil Engineering course some years ago and from my textbook I had a question on a pump with hoses. Unfortunately I haven't been able to find a solution to this yet. A pump feeds two hoses, ...
1answer
20 views

### Mechanism of a manual Crank Adjustable Height Standing Desk

I am trying to figure out the lifting mechanism of a manual Crank Adjustable Height Standing Desk. Please see the image below: My question is what it is inside the metal frame (check the red marked ...
0answers
19 views

### What are some things you need to watch out for when designing analog circuitry that you do not need to worry about as much in digital circuitry [on hold]

Aside from analog circuits adding noise and distortion what else are advantages of digital circuits.
0answers
12 views

### Why a factor of 2 appears in gasket force calculation in ASME section VIII div. 1 flange design?

In mandatory appendix 2 of ASME section VIII div. 1 the following calculation is given for calculating minimum bolt load required for operating conditions of a flange joint i.e. , under internal ...
0answers
24 views

### 140 km/h 11 kW motorcycle battery calculations help

This is my first post on endless sphere. For a while I have been planning an electric motorcycle build, inspired by the 11 kW Zero motorcycle model. Now while I love the tech of zero motorcycles, I am ...
1answer
96 views

### Block diagram vs flow chart?

I was studying a book of control system where i read that a block diagram is a specialized high level type of flow chart So what will be the difference between a normal flow chart and a block diagram?...
1answer
34 views

### Calculating Forces using equations of equilibrium

The homogeneous bar shown in Fig. P-106 is supported by a smooth pin at C and a cable that runs from A to B around the smooth peg at D. Find the stress in the cable if its diameter is 0.6 inch and the ...
2answers
33 views

### A few questions about cars

When I start the car, why do I hear the engine working when I'm not pressing the gas pedal? How exactly does the torque and power of the gears work? Torque = Radius * Force Power = Torque * Speed ...
0answers
6 views

### Pavement Mechanistic-Empirical Design application (v2.3) - Rehabilitation Flexible Calibration Factors

In v2.3 of the software, we noticed that in the rehabilitation flexible calibration tab, there are no standard deviation inputs for thermal cracking. They do appear in the new flexible rehabilitation ...
0answers
44 views

### How fast could a human pedal a car? [closed]

Suppose that we were to install bicycle pedals into a passenger car, say a civic coupe, in such a way that pedaling is as mechanically efficient as riding an ordinary bike. Further suppose that we ...
0answers
22 views

### Why don't they make bigger M16 rifles for 7.62mm? [closed]

I heard that once they had a need to make a new rifle, M16, the military force asked makers to fit it as 7.62 ammo, not 5.56. Whatever the reason, I don't remember, they had to make it for 5.56, which ...
1answer
69 views

### Are all close loop control system intelligent? [on hold]

Can we call all the close loop control systems as intelligent?As they somehow involve automation? Or to be called as intelligent it is must that system has AI(artificial intelligence) especially ML(...
0answers
29 views

### HOW TO DETERMINE SUITABLE JOINT CONNECTION TYPE? [on hold]

I understood about beam end release and how to do it in staad pro but i couldnot understand how to determine which type of joint connection is better.Is there any rule or criteria to know what kind ...
0answers
22 views

### basic second order system transfer function - natural period and natural frequency

I have a question about general second-order system transfer functions. I notice two takes on this transfer function. One has a denominator of: $$\tau^2 s^2 + 2\zeta\tau s + 1$$ where $\tau$ (tau) ...
0answers
21 views

### How to Calculate the Mechanical Advantage of Parallel Pulleys, and Why?

I am trying to learn about pulleys. I understand why a fixed pulley has a mechanical advantage of 1, as it only changes the direction of motion. Another way to look at it is that the fixed pulley is ...
1answer
48 views

### Why is the Cape Elizabeth Fog Signal shaped like this?

On a recent trip to Cape Elizabeth, Maine, I came across this fog signal: It appears to have an electromagnetic diaphragm in the middle, surrounded by concrete and some very curiously shaped steel ...
1answer
16 views

### Cad align with point vs auto fit at Cloudcompare via GEOMAGIC Control

I need to compare two STL (Dental model Scanned) files and find the deviation between their points, SO this two STL files have different boundary, so i already used the GEOMAGIC Control software for ...
1answer
33 views

### Cause of stepped crack up and away from lintel

What are the likely causes of a stepped crack up and away from the edge of a lintel? See the diagram below.
0answers
24 views

### How to produce aluminium powder by E. J. Hall method

I have watched videos on YouTube producing Aluminum powder by mechanical methods. Like this one. It uses Aluminum foil and coffee grinder: There are similar videos which use the same basic method but ...
1answer
13 views

### Flat Fading vs Selective fading, which one is better?

I come from Maths background, but recently I encountered problem where a channel is described as "flat fading channel". I would like to make some conclusions based on that fact. I suspect that for ...
1answer
33 views

### What is the range of frequency used in TV remote?

Household TV remote control use Infrared rays. Infrared rays have frequency from 300 GHz to 430 THz. What is the range of frequency used in TV remote?
1answer
29 views

### Automating the Coolant Top-Up for CNC Machines

I am designing a liquid dispensing system for CNC machines that will top-up a mixed solution of coolant & water at the required concentration. Present concentration in the machine sump will ...
2answers
37 views

### Materials science and materials engineering

Good day, I would like to enquirer the followings: What is the difference between studying materials science and materials engineering? Are there any jobs exclusive to those who have studied ...
0answers
18 views

### Steps in a Downlink Basic LTE simulation [In MATLAB or Java] [closed]

These are the steps in a basic Downlink LTE simulation. Simple requirements are: 1 simple User 1 Cell with 500m range. The user has a random position inside cell range The path loss model is the COST-...
2answers
81 views

### Is there any reason why “inner-flange” style trains are almost universal?

There's basically two ways train wheels can operate, the flanges could be either "inner" or "outer". Switches can be made in equivalent ways for inner and outer flanges. We could expect that, just ...
1answer
29 views

### What is the “allowable number of axle-load to failure equation” used in Pavement ME Design?

How is the allowable number of axle-load to failure equation actually used in the software? Is there any documentation regarding the calculation of the tensile strains?

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