# All Questions

10,142 questions
Filter by
Sorted by
Tagged with
52 views

### What makes a pulley that is rated for horizontal pulling different from a pulley rated for lifting?

I have a home project that involves lifting a platform with a cable that runs through a series of pulleys to redirect the cable. I'm selecting pulleys for the job and I see that some pulleys are rated ...
414 views

### What's the best way to design a joint with two fasteners?

When you're trying to design a relatively long joint with only two fasteners, what's the best way to arrange them? Since fasteners effectively radiate a circle of clamping force around them, what's ...
36 views

### Why don't engineers put tesla valves in the airboxes of carbureted internal combustion engines?

Before I ask the full question, I want to quickly cover two common issues that come up in high performance engine design. When intake valves close in an engine a small shockwave moves backwards ...
36 views

### Why funnelling air in order to increase the velocity is a bad idea when generating power

Disclaimer: I’m not trying to violate the conservation of energy here; I know that’s impossible for us mortals. I think I’m either wrong or not considering something, I just want someone to point it ...
40 views

### How to set measure display units in Solidworks drawing?

I have already set millimeters in document propertis, nevertheless the display units are meters Why and how to fix?
36 views

### Is there a concept of gain and phase margin for a strictly open-loop transfer function?

I'm new to control systems, and I'm attempting to analyze the stability of an open-loop transfer function. I know that by checking the locations of the poles (and ensuring all poles are in the LHP) I ...
28 views

### Despite high fuel economy , why Diesel engine produce more pollutants (NOx)?

Diesel engine are effective in terms of fuel economy compared to petrol engine and emits less CO2, However they produce high amounts of NO2 and other harmful substances, Ideal maximum temperature of ...
59 views

### How can I get final value of $V_{out}$ at $t=∞$ in RC circuit?

I can obtain the transfer function in this RC circuit. $$\frac{V_{out}}{V_{in}} = \frac{1}{(RCs+1)}$$ When $V_{in}$ is set to $10V$, how can I get final value of $V_{out}$ at $t=∞$? I tried to use ...
26 views

### Is it practical to increase engine efficiency by preheating petrol from engine heat waste ? is it applied in any automobile?

I found some article related to preheating the fuel to increase fuel efficiency, but I rarely see such implementation, I assume that it's less effective compared to others But is it really possible ...
12 views

### If I have equations for the dew/bubble point curves, and I know the pressure and enthalpy, can I find the temperature and quality of the mixture?

As mentioned, I have equations for both the dew and bubble point curves, T(P) or P(T) and also rho(T), rho(P). I also know the actual pressure, and enthalpy of the liquid-gas mixture. Is this enough ...
26 views

### How to choose correct motor for my application?

I'm looking to play around with making a massage pad that I can lie down on and has massage nubs that are motor driven. There will be a motor that rotates the nub (the part that does the actual ...
44 views

### What would be the best mechanism to rotate a plate from 0 to 15 degrees?

I'm designing a machine in a small university project that change position of a two-state gate. The two states shown in the Figure below are 0 and 17 degrees of elevation, correspondingly. The ...
33 views

### Why do I have uncertainty in my dimension in Solidworks?

I drew part and added some dimension on overall model and got value with uncertainty Why and how to fix?
13 views

### Unable to multiply the part along the same axis as rotate in SolidWorks

I am trying to multiply part with Linera Pattern and have each instance rotated by 180 degrees. Unfortunately, I can't specify the same axis for both rotation and ...
15 views

### Kinematics of omnidirectional robot (Kuka YouBot)

I want to control YouBot in Coppeliasim through ROS. So, I started to search about the kinematics of omnidirectional robots. I found good information on the book of "Modern Robotics" by ...
18 views

### How much do I need to trickle my faucet in cold weather (as a function of x,y,z)?

I am told that, in cold weather, I should let my faucet trickle a little to prevent pipes from freezing, especially if some portion of my above-ground pipes are likely to get cold. Are there any rules ...
34 views

### How do I reduce the mains spike in a switched mode PSU?

I have a switched-mode PSU for a gaming laptop. It has a bad habit of burning out the switches on mains extension panels when I turn it on (two in the last four days). The turn-on surge is always ...
31 views

### Increase in internal energy and temperature

A banquet hall (150 m3) is to be used for a formal dinner for 20 persons. Each person occupies 0.075 m3 of space and has an average heat transfer rate of 500 kJ/hr. If the AC system fails, determine ...
65 views

### Why is the thin-walled cylinder more likely to experience failure along its axis than along its hoop/circumference?

I was watching a YouTube video to understand the concepts of hoop/circumferential stress and axial/longitudinal stress in thin-walled cylinders and their formula derivation. So the formula of the ...
38 views

### On servo loops bandwidth and tracking

Referring to article https://www.controldesign.com/articles/2018/servo-terminology-makes-a-difference/ I was unable to understand how loop gain influences the noise rejection and tracking. Taking ...
37 views

### Best PID autotuning algorithm/library for simple heater problem

It's the 21st century, anything is possible. Except for PID autotuning for a simple problem, heating/cooling system - make robust and ready to use solution. I've found only one library for PID ...
27 views

I was reading about Automotive Brakes (Chapter 52, Automotive Mechanics by William H Crouse, Donald L Anglin, 10th edition). And in a section about drum-brake self-adjusters, it is said that the ...
29 views

### How can the spinning arms of a dishwasher be leakproof?

Recently I was wondering, how it is possible, that the spinning arms of i.e. a dishwasher or a high pressure cleaner can form a leakproof connection from the fixed watersupply to the nozzle on the ...
80 views

### Why aircraft refrigeration uses a centrifugal compressor in place of reciprocating compressor?

Why aircraft refrigeration uses a centrifugal compressor in place of reciprocating compressor and a gas turbine in place of reciprocating expander?
33 views

### Vertical Distance Measurement Sensor between Railway Bogie and Track

Need to find a Displacement Sensor with following details: I need to place a displacement sensor that continuously measures vertical gap between a railway carriage and the track. That is, a beam is ...
77 views

### What is the amount of force that will cause failure?

What is the amount of force required to cause the beam to deflect, shear or otherwise fail? The force would be generated by a hydraulic piston. Let's call those units PSI. The piston will be mounted ...
49 views

### What is the difference between requirements and design specifications?

Working while employed at large companies, I was at times confused as to what was considered to be a requirement and how a specification differs from it. Upon reading more about it, I have discovered ...
13 views

51 views

### Maximum hole size in brickwork before a lintel is required

Holes are made in brickwork walls for all kinds of reasons including gas flues, to route cabling and to fit windows. At some point that hole gets large enough that a lintel is required to support the ...
What is the method to compute the effective bending stiffness "EI" of a composite structure, in this case a shaft (as seen below). The shaft is hollow with outer radius $r_{o}$, inner radius ...