# All Questions

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23 views

### Low-Flow Nozzles for Corrosion Spray Testing

So, for a cyclic corrosion test system, I need a nozzle or arrangement of nozzles that provides a flow rate of 45ml-140ml of salt solution per hour to an area 60cm square. All commercial nozzles I've ...
49 views

### What mechanism is available to rotate a metal piece on another metal piece?

I am trying to find some type of mechanism where I can have a smooth but not too stiff rotation between two metal pieces. I was thinking of putting a shoulder screw through the pieces (the pieces will ...
9 views

### Looking to apply very specific amounts a vacuum to a small chamber in fractions of inches of mercury to manipulate a diaphragm.

I was considering having the container sealed with a one-way valve to apply the vacuum. I then considered that I might have a vacuum Supply chamber connected between the vacuum generator and the ...
30 views

I am facing a difficult question and can't find answers anywhere else. What on the left is a hydraulic ram, it's pushing the box in the centre to move upward, while the four-bar linkage attached on ...
30 views

### Fitting a sprocket on a small motor shaft

I have a bit of a newbie question. I've inherited a mechanical system, wherein the motor has a D-type output shaft with a diameter of 8mm. (https://www.ebay.co.uk/itm/DC-High-Torque-Worm-Reducer-...
46 views

### How to add external sensor data to pictures, canon DSLR, hot shoe, electronics

Here's a challenge - I am trying to add different sensors data (height,temperature,distance by laser) to pictures i take with a canon DSLR camera. Would it be possible to connect different sensors ...
18 views

### Can we engineer detergent micelles to pick up Microplastics?

I'd like to know if I could get micelles to pick up microplastics in water. I read that microplastics are sometimes charged, so can we make the lyophobic end to pick up microplastics, so that they can ...
32 views

### Analysis Of Planar Frame Using Hardy Cross Method (Moment Distribution) With Sway

The image shown below is a sketch of the structure/frame that I am attempting to analyse using the Hardy Cross (Moment Distribution) Method. I need to find the bending moments, axial forces and shear ...
29 views

### Valve that opens at low pressure closes high pressure

My fluid handling system requires a valve that will open at low pressures (2-6 PSI) and close at high pressures (8 PSI). Is there any commercially available valve that is suitable for this application?...
18 views

### connection of 2G cell towers and support for 2.5G and 2.75G

I have read here: https://en.wikipedia.org/wiki/2G#Past_2G_networks that 2G will be superseded. But doesn't it mean that 2.5G and 2.75G will also be superseded given that 2G is the base? I suppose ...
23 views

### Why does Bourdon tube measure relative pressure?

From Wikipedia: Bourdon tubes measure gauge pressure, relative to ambient atmospheric pressure, as opposed to absolute pressure; But looking at pictures such as the one above, it seems there is ...
30 views

### Why adding less than optimal level water but just enough water to drench the sausage in general isn't the quickest way to cook?

The exact reason why adding less than optimal level water but just enough water to drench and dive the whole sasuage in during boiling in a pot isn't the optimal quicking cooking method? My intiuion ...
29 views

### DC Motor Question

I am not an engineer, just looking for a bit of advice. I hope that it is ok that I ask this here. I have a DC Motor from a treadmill. It is a DC 2.25hp, 180v, 4700 RPM, 7.5 amp motor. I want to use ...
30 views

### Fastening rotating surfaces

This is probably very well explained but I'm lacking the terminology knowledge and that's keeping me from finding the information I need. I have a frame to which I need to attach a weight carrying ...
33 views

### Basic question about PID controller

I am a novice in control systems and just learned about PID controller. So after watching tons of youtube videos I realized that the input of my plant is actually defined by the error. For the case ...
26 views

### Issue with collapsed element in LISA Finite Element Analysis

I'm new to the FEA world and trying to learn the ropes through resources available online. I've imported a model into LISA FEA that I would like to analyze, however, when I press solve to conduct my ...
23 views

### Rolling U shape profile [duplicate]

My plan is bending sheet metal as curved u profile using rolling machine something like motorcycle and or trucks fenders. Is it possible ?and how?
16 views

### Gear train with fixed average speed but irregular instantaneous speed

Is it possible to create a gear train whose average speed is fixed, but whose speed constantly fluctuates? I'm imagining something that would ideally always complete a single revolution in fixed time, ...
36 views

### How long do external hard drives and the data they contain last?

How long do external hard drives and the data they contain last in case of lack of any use after downloading the data and the condition of storage having a room temperature, average humidity of 60-70% ...
24 views

### Liquid delivery to a pump based on viscosity

I have a tank that is filled with a viscous liquid (~3000 CPs). At the bottom of the tank there is a pipe that leads to a gear pump. There is 22" of pipe straight down from the tank followed by a ...
30 views

### Why am I getting multiple answers for different points on the same line?

Different torques about the given axis are obtained when the torque for force F is taken from point A and point B on the same axis. Why does this happen when torque about the axis should be same for ...
19 views

### RC Bandpass Filter on pspice :unity gain frequency

I am simulating a pspice bandpass RC filter by cascading 2 opamps one HP and one LP. I am getting this bode plot at the end. Is the unity gain frequency the 2 frequencies at 0 dB?
38 views

### How to inflate or deflate a bouncy ball that lacks a standard valve?

I found this bouncy ball in my garage. It is too deflated to use and too inflated to store, so I would like to inflate it or deflate it. It doesn't have a standard valve for a bike pump: the only ...
25 views

### How do I import an .inp and an IGES together into Ansys workbench?

I have an .inp file of Ansys that is basically a mesh, that could be imported into Ansys APDL and converting to .cdb file. But ...
29 views

### 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 ...
70 views

### How to form steel truck fenders [closed]

I want to set up steel truck fenders production line, but have no idea how to do that. Something like this picture. Edit1: I have two plans to form final curved shape , using a hydraulic press or ...
16 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 +...
36 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 ...
35 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 ...
44 views

### Electronic symboles in datasheets

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

### Electronic component datasheet handling

What is $V_{IH}$ and $V_{IL}$ in datasheets? I found High-level input voltage and Low-level input voltage on the datasheet?
24 views

### How does reaction rate depends on concentrations in irreversible reactions?

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 ...
15 views

### Finding Tension in cable in 3D Equilibrium

In a typical 3D Equilibrium problem. Assume you have two cables points supporting a mass. The two cables are K distance above origin and form a quadratic triangle with the mass which is a the same ...
53 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.
38 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 ...
11 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' ...
25 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 ...
37 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 ...
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 (...
57 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 ...
48 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 ...
55 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 ...
18 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.
6 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 ...
31 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 $C_l$...
23 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 ...
61 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 ...
28 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 ...