# All Questions

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3 views

### Would Amorphous Diamond-like Carbon coatings have a fatigue cycle limit?

I'm aware that polymers like most plastics can go through stress cycles indefinitely as long as the covalent bonds are not ruptured. On the other hand, I hear that even metals like steel and ...
5 views

### Overlay design of AC pavement

How can I conduct an overlay design in MEPDG- existing pavement is 6 in AC on top of 6 in Agg base on top of subgrade- mill thickness is 3 in. Should I construct a section with 3 in overlay layer, on ...
17 views

### Steel design and manufacturing company recommendations [closed]

I am trying to find UK-based engineering companies to help me refine a prototype, including 3D-modelling/CAD, and ultimately manufacture at scale (I hope...). I'm not having much luck simply googling ...
13 views

### C++ simulate physical audio output

I am searching for help with simulating a physical audio device and get its input from the OS (mainly Windows and Linux). Couldn't find any information about this so far. The idea is to block the ...
9 views

### Force Table containing a pulley, and three forces at different angles with different weights

I am a 17-year-old in high school physics. I'm particularly good at physics yet I am stumped with what we did the other day in class. Our teacher explained what a force table was and came up with a ...
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### prevent shaft from moving in solidworks

i designed a gearbox with 3 shafts.i wanted to do sth so shafts only have rotating movement and not any other type of movement.i cant find any type of mate that can do that,any suggestions?
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### Design automation using fluid dynamics simulations

I have a question about design automation or generative design. There is a company that creates pumps. Their work-flow is following: 1) create design of a pump using CAD 2) create mesh for ...
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### How does indoor temperature factor in when determining ideal relative humidity in a home?

I am having trouble understanding how indoor temperature plays into what a healthy indoor relative humidity level should be. Most sources I have come across searching the topic online provide a range ...
793 views

### SOLIDWORKS - 3D Sketch of Trombone

My task is to create a 3D Sketch of a trombone like the one below My professor recommended defining the points 1-4 and putting a spline through them. I did that, but my resulting design looks weird. ...
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### Sunroof Testing

I have 2 sets of data. The 2 sets are not linked. One is regarding the curvature of the glass panels of the sunroof. The other data is about the factors of the glass panel like thickness and I-value ...
26 views

### solidworks mating gear with shaft problem

I am trying to mate a gear with a shaft via a key.key coincident with gear and cocentericity of gear with shaft cannot both be made.
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### Passive pressure at bottom of soldier for a shoring wall

The passive earth pressure "Pj" at bottom of soldier in a shoring wall getting from literature "Soldier pile System" in CA trenching & shoring manual (revised 06/95) & used in certain software ...
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### Does a house heating system affect perceived and true indoor air humidity?

Does a house heating system affect indoor air humidity? Or to be more precise, does it affect your perception of how dry the air in the house feels (for instance dry is your mouth waking up)? (I ...
25 views

### Rocket vs aeroplane? Difference in take off?

Although both aeroplane and rocket burn fule and eject smoke but Why aeroplane moves and runs horizontally before take off ?why does not it takes off at its original/initial place just like rocket?
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### Truss analysis of internal forces in members

I am trying to calculate the internal forces and their nature in this truss, however, I cannot seem to do so as both the method of joint and the method of section do not work. I think this is because ...
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### How the design of ship help to survive in the water

I have seen bigg cargo, and other ships, and I like their structure very much., a question come sin my that why the ship structure is like this. Can anyone explain what was reason for this. I am not ...
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### What calculation to find how much force before tipping over?

I was thinking of building a free standing structure out of plumbing pipe that would go flush against the wall to hang jackets and other items. Attached is a sketch of the general thought of what the ...
22 views

### Designing an RLC circuit with specific transfer function

I have a transfer function below. $H(s)=(s^2+(1/2)s+(1/2))/(s^2+s+1)$ Using this, I have to design an RLC circuit with that transfer function. At first hand, I did some inverse Laplace Transform, ...
19 views

### Airfoil meshing using ANSYS

Logged in a little time ago i have a new question. So I am trying to mesh an arifoil geometry using ANSYS meshing. Airfoil number is NACA 84-M profile. Running 2-D simulation my main objective is to ...
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### Basic dimension relationships in a valveless pulsejet engine

I'm willing to take my own shot at the construction of a blast supercharged valveless pulsejet, a holy grail among DIY jet enthusiasts. However, since my idea is not very compatible with the geometry ...
33 views

### Cost engineering support plan

So i have the following assignment to do till tuesday. Write a Cost Engineering support plan which reflects the Project Control Cycle. A wine company is wondering if they should invest in another ...
37 views

### Build airports on plateaus?

I was wondering whether it might be a feasible idea to build airports on top of high plateaus in order to lower the cost of the take-off? Such a plateau might have an altitude starting from 5000 ...
34 views

### What will happen if we place a couple of separate, small stators around a long rotor instead of 1 large stator around a short rotor?

My original theoretical consideration was using the electric motor's rotor as drive shaft in a car. It led me to this question: "What will happen if we place a couple of separate, small stators around ...
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### How much does the weight of urban structures (buildings) affect the compaction (permeability, porosity, density) of alluvial sediments below a city?

Original Question was here. I live in Van, Turkey. Van City is situated on an alluvial plain beside Lake Van. General geological structure of the area can be seen on pages 43-44 in this conference ...
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### Is it possible to run 3D design and modeling software on Integrated Graphics?

I'm a student and I need to buy a laptop on a mid-range (~ \$500) budget for learning modeling and design software. I think all I'll get on this budget are the ones with integrated graphics (like Intel ...
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### What CAD software is this?

In Rocket Lab's presentation video, at around 00:21, you can see some engineer work with CAD software. Here's a screenshot: Can anyone recognize which software they're using? Asking for a friend.
22 views

### Why are the outter tracks of a magnetic disks more stable?

In our digital computers class, the professor mentioned that the outter tracks of a magnetic disk is more reliable because the outter bit are "bigger". Isn't the packing density of a magnetic disk ...
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### Uses of orifice in Water Jet Cutting?

I wonder whats the usage of orifice/orifice plate in Water Jet Cutting Machines. To increase pressure(due to a smaller diameter with respect to the entrance cross-sectional area) or to convert to ...
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### Is a motor failure caused by a defect bearing considered to be a failure mode or is it higher vibration and speed loss in FMEA/FMECA?

Let us assume we have a motor with a bearing which is exhibited to wear. Over time, we can observe higher vibration, increased noise and the motor speed reduces due to the bearing fault. In the end, ...
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### I have 3D model ready in Autocad. I would like to color it and extract a 2D png file from it to use

I am new to the AutoDesk AutoCAD drawing software. I would be really appreciated it if someone could help me out. I will attach the image of the content. I found 3D drawing from the internet, which ...
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### Hydraulic solenoid valve recommendation [closed]

Not sure if it's appropriate to ask this question. Im looking to prototype a marine ROV. looking for waterproof (~100m) solenoid valves. Can anyone point me to sources? thanks:)
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### Will specific fillers or chemicals make simple plastic milk cartons more durable, enough to be used as weightlifting plates

no code involved and no technical equipment is going to involved in experiment and implementation for business/tech startup that is, in brief, a way for me to exercise during my business studies! ...
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### Describe the Relationship between System Constants for a Ideal Gas Thermodynamics

I am required to write a report on System Constants for ideal gases. I don't entire understand what is required of me. By system constants does he mean when you hold either volume, pressure or ...
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### Deflected Beam Shape as a Function of z

I'm a bit confused with the wording of the question. What does it mean by expressing the bending moment and the deflected shape of BC as a function of z? Thank you]1
913 views

### Can I weaken a coil spring consisting of spring steel?

I have a steel coil spring that is used by compression. It is too strong, and I would like to reduce its strength by some fraction, ideally keeping its length. Reducing it to roughly half would be ...
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### MAASP calculation

I am a second year petroleum engineering student. I need help with calculation of maximum allowable annular surface pressure (MAASP) on different types of annuli. There are inputs entered by an ...
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### High frequency TIG welding and Bluetooth or WIFI frequency

I need to work on a project where multiple objects need to exchange trough wireless protocol and they are near to High frequency TIG welding machine. All objects works by pair (one emitter and one ...
38 views

### Why are/were sewers made large enough for somebody to walk down in there?

Today, I have been reading a lot about sewer systems on Wikipedia, in the hope that I would find information or at least photos showing what I think of as sewers, namely somewhere under the streets in ...
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### How to calculate heat transfer between two solids in a medium?

If I have a cuboid block of metal and there is a cylindrical source of heat input (A) and I want to determine the heat energy at B (also cylindrical) how would I do this? I understand considerations ...
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### Beam with internal hinge - Reactions help

can someone explain why the highlighted area (at Mb=0) is - 5x2 and not positive? Since the rest of the loads(and the rest of that very same load) pointing down were documented with a +, I dont ...
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### Sizing an AC Servo Motor for lifting pallets

I am trying to size a servo motor and my basic physics and math is so rusted that I can't figure out how to go about it? The scenario is as follows: I need to lift an object in the vertical direction ...
19 views

### Meltdown/Spectre attack

What concepts should a newbie(someone who doesn't have too much knowledge about computer architecture, user/kernel space, memory etc.) understand if he wants to know how Metldown/Spectre works? I ...
9 views

### determine the force induced in a rigidly held component that undergoes a change in temperature

A steel bar of length 1m and diameter of 30mm is held in a frame and experiences no stress at 20°C. What will be the stress in the bar if the temperature rises to 80°C and any change in length is ...
56 views

### Driving Gearbox in Reverse

https://www.maxongroup.com/maxon/view/product/251601 https://www.maxongroup.com/maxon/view/product/gear/spur/gs45/301171 Consider that this motor-gearbox combination is backdriven so that the motor ...
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### Complementary sensitivity function in waterbed effect

I am studying the waterbed effect in control systems, and so I have studeird that from the Bode Integral, if I increase the sensitivity to avoid low frequency disturbances, I have amplification of ...
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### Application of thermodynamics [closed]

Air with an initial volume of 0.12m³, pressure 1 bar and temperature 18°C is compressed according to the law pV1.3 = c through a 8:1 compression ratio. It is then allowed to expand isothermally back ...
28 views

### Temperature rise of a block of aluminum under constant heat flux

Consider a block of Al. insulated all around except on one side, where a heat-pipe is to be inserted. On the opposite side of the heat-pipe, there's a heat source (Resistor) with a given heat flux. ...
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### What 's the function of COMP pin(Pin 3) in LM5030 - Push Pull IC?

I'm a student. Now, I am learning to use LM5030 IC to design a Push-Pull converter. So, I read LM5030's datasheet and can not understand the function of COMP pin (Pin 3). The red line is Feedback ...