Design Definition and 1000 Threads

Dear experts, I'm looking for some approximate (but reliable) design loads and geometry for wind turbine towers to perform a comparative FEA study. I don't need very exact data. I just want some load levels for different wind towers, e.g. for 5 or 10 MW on- and off-shore wind turbines, and...

I am designing an inlet tube and a screened outlet for a cylindrical tank with a top opening hole (which determines the water level). I hope I could receive some suggestions and advice on the approach or some texts/equations I should check out. I am still in the process of learning fluid...

Am having a difficult time with Bias-Tees. I do not know how to get the characteristic impedance (although I assume it uses the equation below) How would you use this if you are not given the R and the G? You could guess L and C. I know how Bias-Tees work and that a typical schematic would...

Summary:: In my course, we have to design a truss bridge (made out of balsa wood sticks) that can withstand the most weight compared to its mass. It’s our final, so very important haha. One of the rules is we can’t stack the wood right on top of each other to support it (just preventing us from...

i have been stuck on this question from my assignment, i have tried solving it in many ways, but apparently i am either bad at this or i just don't understand the question haha. * As a prudent engineer, the main shaft is now subjected to loading condition when only brake is applied. Show with...

Hi all 😁 Hopefully it's ok to ask this question here. Ok so my project is a little bit redneck as opposed to being engineered science. I have been experimenting with burning waste oil in my oil furnace in my garage. It is an average house oil furnace with Beckett burner. ( burner has electric...

A question for folks designing circuits, is it the case that 100% of transistors must be functional for the circuit to operate, or are a few transistors allowed to fail in the design, but compensation circuits or redundancy is put in place to prevent circut funtionality to degrade? I'm wondering...

I have defined all the list of components necessary for this process and the chosen property method was (ENRTL-SR). I chose Gibbs reactor to simulate the low-temperature reactor, high-temperature reactor, and chemical absorber because the kinetics of the reactions is not known. Also, the Rstoic...

1. A CO2 canister with the following dimensions will be used. 2. A shell was designed to house the CO2 canister, and the coefficient of drag was calculated to be 0.33 3. The constant thrust required to move the torpedo at approximately 1ft/s was found by using a free body diagram to generate...

My school recently got an industrial robot arm with a precision turntable. I was thinking how to use this with some cameras/lasers to make a 3d scanner. Where would you folks recommend I start looking?

I need a ME to design a rack and pinion system where both gears are plastic (type chosen through discussion) and rather small (5mm diameter for the pinion and 6mm length for the rack). The rack is moved by a spring loaded button press and the goal is to rotate an axle the pinion is attached to...

Im trying to design a circuit that switch from 220V AC to 2kV DC using 1 voltage source (without use of transformers). So CW (Cockcroft-Walton) seemed like a good design to do that. Looking at the equations of halfwave CW it looked to me that the optimal number of stages is set if you know the...

I've been told an effective induction stovetop needs to deliver about 1000W of power. I have magnet wire that can tolerate at most about 0.2A of current, and was planning on using a 60Hz wall outlet as my source (obviously I'll need to bring down the outlet current quite a bit). So the energy...

Hello, A question came up in my head that I couldn't think of a way to math out. Say I want to design a parallel plate capacitor. The equation for capacitance is quite simple: Everything in this equation makes sense, besides for the distance. This is saying that an infinitely small length...

Hi, As the summary says, I'm trying to design a simple gearbox with an approximate ratio of 20:1. I have two preliminary designs, one using a worm gear and another using a train of 5 spur gears. Both designs give me the desired ratio, but I really don't know which one I should choose. The...

Summary: In terms of stress, strain & deformation, what is better for a given component. 1) low stress or high stress 2) less strain or large strain 3) less deformation or large deformation? Some dimensional changes were made in an existing component to study how these changes effect the...

I greatly appreciate the opportunity afforded by this forum to submit questions. I am presently tackling a 10-part question, fourth of which this post is concerning. Values provided at the start are: R1, R2, k, V_T and I_D. In the previous 3 parts, Source Resistor, Transconductance (g_m) and...

Hi, I need to know the name of some very good books for learning linkage design. I have to design some complex system using Linkage. I have to design excavator, truck and crane and hydraulics machines and civil Engineering Machnies, Agriculture machines, robot arm. I have a little knowledge in...

I’m designing a subsea sensor that will go to a max depth of 600 m (6 MPa/60 bar). In a simple model, it will be made of a pressure housing cylinder and two end caps, all grade 5 titanium. Some geometry is attached. I’m looking for advice on how to calculate the thickness of the...

Hello everyone, I'm trying to design a plastic shredder machine, but I'm stuck on how to determine the cutting area of my shredder. I've already made some research, and I think that the cutting area depends on the blade thickness and the plastic thickness. As for why the blade thickness is...

In reference of Ned Mohan's book, I have designed a heatsink, firstly natural convection taken into account, but laboratory test results and theoretical calculations are not matching. The test results: For 40 A (means 62 W), 30 Celsius ambient temp, it raised up 51 Celsius. So, Rs-a =...

I want to learn to design a synchronous generator, I search and search but I don’t find nothing to that.

I’ve been trying to design a counterbalance system using a constant torque motor spring assembly. The spring I’m looking at has 25.4kg cm torque on the shaft from the output drum. So if I put a 100mm diameter cable drum on this shaft I should be able to counterbalance 5kg over the given...

So what comes to mind is utilising the full height and further node points in a triangulated system... however being only just now introduced to the concept of a compound lever I am unsure of how to get this system to work. Any thoughts much appreciated.

If I have impact test data showing energy absorbed by notched specimen, how do I utilize this data while designing. In my case, i am trying to design the valve which closes by striking on valve seat, how do i use the impact test results for this design?

How can I calculate the braking torque in wind turbine?

I want to design cross section area required for valve stem when valve is closed under spring force. Valve stem should be designed for buckling load but I am unable to calculate buckling load coming due to impact force coming when valve bangs on valve seat. Valve is having concentric spring. Is...

Hi friends, I am studying this circuit which is the first all electronic television receiver created by Dr. Farnsworth back in 1927. Triode are being employed along with some caps and coils. The design is very simple and clear, basically this receiver is a detector circuit which detects the...

I think I know the answer,but just to make sure. I have two coupled inductors through a core that provides better flux permeability, aka a transformer, I provide say 5v and 1000 amps AC to the primary loop, in my secondary loop I have a capacitor in series with the loop (of sufficient...

Hi all, I'm fairly new here. I'm currently designing an as-homogene-as-possible permanent magnet for low-field NMR and similar experiments. I'm on a fairly tight budget, and having finally found pole pieces for my magnets, I got them even though they have a small saw cut in the edge. approx. 5...

Hello , I have an medical device assembly, where I trigger the needle for injection, mechanically, with a pretensioned spring. Injection takes 3 minutes, then I have to retract the needle. How can I trigger the needle, using an electrical impulse ?

Hello, I have a question about electron guns. I have read a lot, and all designs use high NEGATIVE voltage (-1000v for example). Is possible to use high POSITIVE voltage like this drawing?. Or do you think it will not work this way? Considering that all the chamber walls are at ground voltage...

Hi Everyone, I would like to measure voltage output from a sensor via an Arduino. The sensor outputs 20 mV at max capacity. I'd like to bump this up to around 5 volts so it is easier to measure. My plan was to use a non-inverting topology coupled with an LM393N op-amp. The schematic for a...

Hi folks! For those of you who are familiar with ellipsometers, are the following some significant pains/problems with the apparatus? Are there other significant pain points? 1. The machine is too bulky. 2. The change of angle is too slow. 3. The minimum angle is limited by thickness of arms...

Bolt comes out by distance d=1.58 mm when speed of rotation of shaft reaches its trip value (w_trip). m is mass of trip weight (Bolt assembly) One of the approach which I had considered is work energy theorem. Initial energy = 0.5m*(w_trip*(r+d))^2 Final Energy= 0.5m*(w_trip*r)^2 (Assuming bolt...

I’m wondering what skills are needed to go from being a project engineer (in the construction industry) to that of a mechanical design engineer? More specifically, what exactly is an employer looking for when they hire a design engineer? We all know that any good engineer should have great...

Hello. I've built this syringe pump. The chosen motor is a NEMA 11 with a maximum torque of 6 Ncm. The thread rod is an M5 with a pitch of 0.8 mm. The whole system will consist also of a long tube (1 m length, 3.175 mm external diameter, 1.5875 internal diameter), at the end of which I'll need...

I have a project which consists in making a tennis ball launcher for training kids (6-12 years), but there is a catch, the mechanism can't have any elastic parts (springs, bands, rubber). It has to be purely mechanical. I need help

How do you increase torque in gerotor design other than increasing flow. Will lengthening it increase torque? Will increasing diameter increase torque? What about running 2 or 3 in series?

Hi, I am making a half bridge power amplifier that operates at 24 V. The bridge has to supply around 3A current to an inductive load (10mH) The bridge will be controlled using 20kHz PWM from a microcontroller. I have put a ACS712 current sensor in the load path to give feedaback to the...

I found this interesting engine design on the internet. It is one of the most powerful and largest machines human have ever designed. It is a fusion powered propulsion device, it uses “heavy fusion technology” which can use any elements lighter than Fe-56 as power source. Is this design feasible?

What is the method to design a Non - Telescopic, Non - Linear, conical compression spring from a Force - Deflection characteristics

I've been working on modifying the cyclotron particle accelerator. Tell me what you think? It's pretty basic though

I am working on a design for a water powered drive shaft. The water source would be from a 2.5 inch diameter hose, at approx 75-100 psi. The goal would be to get 55-115 RPM from the shaft and max torque in the smallest possible handheld device. That being said, it seems my best options for...

I remember a while back someone told me that there exist programmers who don't believe in null. I thought that was a crazy idea. Until recently, as I've gotten better at OOP and have figure out that if my object has a property that is allowed to be set to null, it usually means that I am not...

I am going to graduate this year with a bachelor in electrical energy engineering, i am very passionate about designing and fixing problems, i would love to work in the R&D department of some multi-national company, but i don't know where to start. What qualifications do they usually ask for...

I need to design a mini projector as a part of a project I am working on. The body of the projector is approximately 7 inch tall and 5 inch wide. I don't know what kind of a lens I need to ensure the projection is sharp and crisp (it is only black and white writing). I know I would need a zoom...

[I've searched the site and did google. I couldn't find a satisfactory answer] I have the motor characteristics and the moment of inertia of the object I'm supposed to spin with it. I have to design the shaft considering the torsional failure. Now, if I consider the inertia of the body, there is...