Design Definition and 1000 Threads

Hi! For a university project I have to design a braking mechanism for a remote controlled car. I have very little experience in designing constructions, so I thought I'd ask here for any advice on the matter. I'm mostly curious about the design pattern, the thought process I should be going...

currently i need to turn on my IGBT. i measured Vge, it shown 8.25V, but my design requirement of Vge is 15V. i did some research, do i need to add in parasitic capacitances to my IGBT??

Hi fellow scientists and engineers, I have a question regarding the design of a flywheel. I know that the actual engineering of a flywheel is very complex and in no way I should expect actual practical answers from this simple question. I'm just trying to get some estimates for a renewable...

I am 17 years old and aspiring to be an engineer. When I go to university next year the course I will be studying is Computer-Aided Mechanical Engineering. I wanted to study just Mechanical Engineering however I did not get into the university that does it and this is the only course that I want...

There has been much talk about regerative braking on PF lately. With that in mind, this article in today's Washington Post caught my eye. It talks about Otis Elevator's newest design which the article claims is 75% more efficient than conventional elevators...

I want to to know the physics behind the design of the modern blender blade why is the design the way it is today..why only this specific design of blade is used? Any reference to any research paper or article about the blade shape will be appreciated.

Hi everyone! Just joined the fórum after a lot of hours searching the web and Reading some books...I have one question, didn't found na answer to it...but let's give it a try ;) How can you determine the optimal circular pitch and in consequence the optimal diametral pitch of a gear (increasing...

I was watching a discussion on wether the the universe is the way it is through design or by chance. The design theory is basically that the universe is such a complex entity and that for it to have evolved exactly as we see it, then it must have been designed. The counter theory is that we live...

Homework Statement I'm working on a problem in Design and Analysis of Experiments by Dean and Voss. It's Chapter 10 question 11 part c. We have an experiment with 2 treatment factors (each with three levels) and 1 blocking factor (with four levels. It's a randomized complete block design so...

I have been an electrical design engineer for 3 years now and although I like what I do, sometimes I feel like there's something lacking about the job. I mean that I hardly get my hands dirty by actually assemblying or giving maintenance to the equipment that I design. I know that there are...

Hello everyone, I graduated with a BSEE in 2008 and tried a PhD program in EE (semicon device specialization) for a while but it didn't work out. I struggled with an illness that forced me to drop out. I have been working in industry (NOT The semicon industry) since leaving the PhD program...

Bidders propeses ASTM A36 material istead of S275 J2 or S355ML/NL for structural steel (Piperack, Equipment Structure, etc.) on the basis of international standards for most optimal and economical design. Is it really optimal? pls explain why

I'm just a bridge engineer and amateur astronomer, so I'm hoping someone here with more advanced expertise in light waves and reflective surfaces can help me. Basically I was wondering how big a space telescope's primary mirror would have to be in order to view an exoplanet 10 or so light years...

Hello, I've recently taken up an interest in engineering and design, particularly how computers and smartphones work, automobile design, aerospace, etc. Really I've been interested in the subject for a while, but just now decided I want to learn more about engineering, and since I've been...

I tinker with single cylinder 4-stroke (kart) racing engines a good deal. Flywheel design for optimum weight has always amazed me. Does anyone have formulas for optimizing the design? It's more than just saying "x" pounds is best, because the actual shape of the flywheel, width and thickness of...

Burt Rutan is at it again with a new plane the SkiGull - "Its docking system is two, 5” diameter electric motors each driving a 27” diameter folding prop. These self-contained units (Off-the-shelf motor, controller, batteries used for giant RC models) mount on each wing. They provide forward...

I'm looking for some info/guidelines on designing bolted joints that are made to move with some resistance/friction...all without loosening the bolt. Think of a legs of a camera tripod; the legs can rotate in and out with resistance, but they never loosen. It seems the basic idea is that the...

If you buy a generator (gas powered etc) there is only a certain amount of watts that the generator can put out. This is because the engine only has a certain power rating (and losses). However, if one were to put a higher power engine on the generator head and remove the safety breaker for...

[ mod note: moved from homework ] as a mechanical project we have been asked to design a micro steam car. we have chosen to use a wobbler engine for this. The aim of the project to see how far this car can travel based on a given amount of fuel. We are making a boiler which will provide the...

I have no idea about this please help me to design a small sized high torque slow speed motor

Homework Statement Design a component that uses a 4-to-1 multiplexer to choose between one of four different operations to get the result from. Each of the operations and the multiplexer should be behavioral design in their own modules / files to be used in the overall component design as...

I would like to build, from scratch, a small generator to be driven by a small windmill, for experimental purposes. One such generator on the internet has 8 NIB disk magnets (about the size of a quarter coin), flat sides facing out, mounted around a plastic rotor, with axes aligned along the...

Hello there guys I'm trying to find out which ball bearings I have to use for a new wheel hub I am designing. What I'm currently doing is a load analysis for the axis but I am confused on how would the forces that affect the wheel (normal, friction, lateral force when the car takes a turn...

i need the design data of a reaction steam turbine in order to complete my project..My project is about waste heat recovery plant..

Hi, I need to design a lift mechanism that is powered by a small continuous servo. It needs to lift a plate up at least 4 inches, and be totally powered by this servo...

Hello guys I want to fabricate hydraulically operated scissors lift. I preformed calculations & fabricated same but unfortunately it didn't work. Can anybody help me out to design it again. Required specifications are Maximum load: 1000Kg Open height: 1500mm Closed height: less than 375 mm...

Hello All. I'm working on a project to build an infrared spotlight which will hopefully light up a distant object so that I can see it on an IP enabled night vision camera. The lens problem seems very straight forward, but I could use some help. Per the attached diagram, I want to focus the...

Aluminum foil reels have to be preheated for manufacturing but it's inefficient (the doors aren't sealed and the material isn't in close contact with heating elements at the sides). I'm considering an initiative of more efficient design. How difficult would it be to evaluate heat transfer if...

Hi anyone have the procedure to design the plate fin tube heat exchanger (air cooler) at defined mass flow rates and inlet / outlet temperatures , or anyone have an software package can be used for this purpose , please can share it with me

Hi Everyone, here is Hubert again. Here attached is my design and the problems I am facing. Can anyone be of help? Thanks in advance. Best regards Urbain

I've been looking for quite some time for some tutorial/video online explaining a working circuit. I mean, consider some simple analoge circuit, with resistors and voltage dividers, caps, maybe even transistors etc etc... If this circuit performs some understandable task, then what do these...

Hi! For our class project, we have to design a system that freezes an amount of water as quick as possible. The refrigerant is R134a. The compressor is known. I don't really know how to get started here. How do I choose the evaporator pressure and the superheating, and equally the condensor...

i would like to design and build missiles for the navy which upper school subjects should i take and then which uni corses should i follow them up with

Hello everyone! This is my first post, so excuse my improper etiquette (if any). Anyways, the Pinewood Derby, just in case you guys are unfamiliar with it, is an event that is held as a competition where small, homemade cars, race. The track is contains a ramp, which then leads onto a flat...

I am a member of a small group of physics graduate students in charge of a monthly series of public science lectures. The lectures are aimed at local high school students, and we have many high school teachers who encourage their students to attend by offering extra credit. The audience of each...

how to design a circuit to determine the rpm and torque from a fan?

Hello, I have to design a heat exchanger for my uni course and am a little stuck with where to start. I know a little about LMTD and OHTC etc etc. my main starting problem is finding material properties for ethylene glycol, I have tried Engineering Toolbox but for the maximum temperatures I am...

I'm graduated in mechanical engineering. I would like to do MS on Refrigeration from USA. Then I would like to focus on design fields. But currently I'm working in the field of steel structure erection. Hope your suggestions and advices to change career.

Homework Statement Design the circuit in the following figure so that ##V_o = 3V## when ##I_L = 0## and ##V_o## changes by ##20mV## per ##1mA## of load current. (a) Use the small-signal model of the diode to find the value of ##R##. (b) Specify the value of ##I_S## (saturation current) of...

Hi, I have been given a project to design a system that can "bead deposit" thermoplastic. I have found this resource, It is basically an adhesive deposition system used for packaging in industry. So I think this is a good place to start, by trying to create a simplified version of this. I...

I have been tasked to design a controlled descender to be used on a building site to lower tools/rubble to the ground. I'm trying to design a product like a fan descender like that seen at powerfan.co.uk Could anyone help me with the theory side of its operation. Obviously it uses the fans...

Homework Statement The attached figure shows a simple voltage-divier connecting a dc voltage source to a variable resistive load. Design the voltage divider to provide a voltage of about 5V (+/- 10%) across the variable load. The load-current demand varies in the range of 0 to 5mA, and the...

Homework Statement Design an integrator to integrate a ##2 kHz## square wave with peak to peak amplitude ##0.5V##. Choose ##R_F = 150 k##, ##C_I = 10 \mu F##. Choose ##C_F## such that ##R_F >> \frac{1}{\omega C_F}##. Choose ##R_I## such that ##R_IC_F << 0.5 ms## and ##\frac{1}{\omega C_I}...

I need to design a pwm circuit, i using the circuit from internet that i attached it.. freq is 20khz which is my requirement and 15v to power up the tl494.. there is no response when i connect potentiometer to it... waveform is attach can anyone give me advice?

Hello everyone, I am trying to design a self reversing screw. What I am doing is, I am sketching a rectangle and using extruded cut option in Solidworks, cut it along a helical curve. One more and this time in the opposite direction. It comes out nicely. Now what I don't know is, should I use a...

Homework Statement Consider a strictly decreasing function F: ℕ → ℤ. We want to find the "first place where f is at or below the horizontal axis." Assume we can compute ƒ(i) for any input i in constant time. Clearly, we can solve the problem in O(n) time by evaluating ƒ(1), ƒ(2), ƒ(3)...

I am working on a project that uses a box design with a base. The base has two through holes on the the outer edges that will be used to slide up and down with in the box. The box will support two guide rods where the base can slide up and down. My intention was to use springs so that as...

If using diffusion pumps (2 or 3 in series) to achieve ultra high vacuum, how do you hook them up together, for example adding them onto a system like in the provided picture? Would you use T-connectors to put them all on the same input and output valves or would you have valves for each pump?

Homework Statement Given the availability of resistors of value 1 kΩ and 10 kΩ only, design a circuit based on the non-inverting configuration to realize a gain of +10 V/V.Homework EquationsThe Attempt at a Solution So I was doing some of those good old design problems, and I came across this...

Homework Statement Draw the simplest logic gate or circuit for the description below. The inputs are ##a, b, c## and the output is ##z##. ##z = 0## only if ##abc = 010## or ##abc = 110##Homework EquationsThe Attempt at a Solution So i drew up a quick table, AND and OR'ed the required terms...