Design Definition and 1000 Threads

I am currently in the middle of constructing a Newtonian reflecting telescope and I had a question. The focal length for my primary mirror is 1500mm and 3mm for my eyepiece. My question relates to the path of the light inside the tube of a telescope. I understand that in a Newtonian reflector...

Hello everyone, I have a BS in EE and a BS in physics and I am wrapping up my MSE in electrical engineering from a large university in the southwest. My MSE concentration is semiconductor devices. I don't know anything about IC design really, but I would like to somehow break into the field...

i need I need to design this mechanism, but have not found the design criteria or how, someone could show me how or where to look. I need to design the mechanism that puts the lid to the product. but not with pneumatic actuators. in the following videos you can see how it works:

I have an i-beam placed horizontally and i want to apply 1 ton point load on its center. Now i will run a stress analysis on ansys on it and will get the displacement in the beam on the mentioned load. How will i know tht the displacement value i am getting is good or bad?

I have an i-beam placed horizontally and i want to apply 1 ton point load on its center. Now i will run a stress analysis on ansys on it and will get the displacement in the beam on the mentioned load. How will i know tht the displacement value i am getting is good or bad?

Hey everyone! This is my first post here so take it easy on me! Before I get into the circuit I'll give a little backstory here. I'm a business student at a US college right now and I have a good friend who is a Biomedical engineering student. We were arguing about whether or not I would be...

Homework Statement Homework Equations V0=Vsrz/Rs+rz+VzoRs/Rs+rz-ILrzRs/rz+RsThe Attempt at a Solution I formulated 4 cases for voltage inputs of 11 and 13.6 V and 0 to 100 mA. The zener current has to be between 3 and 30mA or 103 and 133mA. How can the current be maintained in thes two...

The problem statement: I want to produce an LL-EMF of a specific amplitude and frequency in a pair of Helmholtz coils of pre determined radius. The frequency and amplitude are derived from the following equations from this publication...

Hi, I'm trying to design a contraption for a project that will move an item/box up and to the side. I have a picture of what it should look like and how it should look like but I need help with the mechanics of it. The box's starting position is In the ground and under a slap of metal or wood...

Hello everyone, I have a request. Can someone please provide me with a metallurgy research design template? I'm starting my 5th year in a MSE PhD program and for the last 3 years my advisor has instructed me to perform experiments on my alloy without reason. And while I thought this was...

Hello all! I hope I am posting this in the right place. I am looking for some help on the following circuit. Basically I am doing a relay application using one of TI's chips. Below is the reference design from an app note along with my actual circuit modeled in TINA. The main function is that...

what is Ring Main Unit design in electrical panels ?

Hello, I have downloaded CAD models of a rack and pinion, and I don't seem to be able to mount them up in PTC Creo without quite obvious interference. The pinion has a pitch diameter of 24 mm, and a modulus 2. The "pitch diameter" of the rack is exactly one modulus lower than the tip of the...

Good Evening Everyone, A group of friends and I were having a mini-contest, to see who could theoretically make anti-matter using the most simplistic design in terms of cost and general complexity. The obvious choice for us was the Positron, due to low energy requirements on all fronts. One of...

Hello guys. I am new member of this forum and I am looking for some guidance on a certain project. Now, the reason I am posting is that I need your help with a project I am currently just starting and of which unfortunately I have little details figured out as well, so please bear with me if you...

I didn't know where to put this, I figured I'd start here since this area sees traffic that other areas might not see. Someone can move it if there's a better section for it. I'm thinking of an instrument design that has a light path as follows: UV-Vis light source, monochromator or filter that...

Hi everyone, my name is naresh. I'm doing m.e, currently I'm in project, I'm designing a loading equipment for a truck. in which i need to design an end truck similar to monorail's case. so i went through some references. but i need to design it for a small length say not morethan 600 mm. How...

Hello! I am studiyng for electrical engineer and i think its finaly time to build a transformer myself. I don't do this, cause i need one, but rather to learn how to design it. I'll be happy if you give me instructions how step by step to calculate one. Not how to physicaly build it, but to...

I want to build http://www.hobby-hour.com/electronics/lm2576hv-adj-buck-regulator-schematic.png From http://www.hobby-hour.com/electronics/lm2576-step-down-switching-regulator.php I might not be able to source exactly the same parts. I assume I have to use the same IC, but could I use a, say...

Hello i am having trouble figuring out the proper profile to use for the worm and the gear. I need to model it in solidworks and everything i am finding online is for spur gears. I need to get the worm and gear to mesh correctly so i can do some finite element analysis on it. I have calculated...

Hey, So I've taken a course learning theory to mosfets, Jfets, transistors etc. Recently we did an amplifier project with a summing component as a final project. I chose which component pretty randomly. I'm a little misled as to which component is better in certain circumstances. BJT's are...

Homework Statement "design a band pass circuit having a midband gain of 20 dB with -3 dB frequencies at 20 Hz and 20 KHz the amplifier should not produce any phase shift." does midband gain strictly apply to voltage gain (because that's how i look at it)? I was going to use a common collector...

I have recently passed the Electronics Engineering Licensure exam in the philippines and I'm plannning to pursue a career in chip design preferably mixed signal or digital. I have applied at different semiconductor companies. The problem is they don't design the IC's here, they only conduct...

I want to design a crank mechanism. I found this page on Wikipedia https://en.wikipedia.org/wiki/Piston_motion_equations Relating from this diagram, is x the max stroke of the piston ?, or is it PO-(max stroke of piston) ? And why is l^2 = r^2 + x^2 - 2*r*x*cos(A) Shouldn't it be, l^2 =...

In The Martian we see airlocks that an SUV would fit into. Wastes air every time it's opened, even if pumped down. I suggest we make an airlock that clamshells down on a space suit and leaves the minimum amount of room between suit and lock for air to be reclaimed from. You could have banks of...

1. The two rotors (purple, green) are electricaly isolated but mechanically fit to rotate along same axis 2. The motor action on the left side rotor will move the armature set, this will produce currents in right side rotor that will pass via a variable load. 3. do you see the magnetic fields...

How much force required to pull the actuator pin from the solid cylinder Weight of the solid cylinder is 15kg And angle of inclination 30 , Coefficient of friction 1.5

I am currently working on my college project about the design and optimization of plate heat exchanger. However, i have no idea where to start the project. Here is my first thought: - I set the hot and cold fluid to be water, 90 degC for the hot inlet and 30 degC for the cold inlet. - 50mm inlet...

I'm looking for a textbook on designing mechanical systems with multiple machine components. I'd like to study both rigid and non rigid dynamic systems. I'm open to studying systems composed of any mechanical component. In particular, I'd like to learn 1. draw accurate Free Body(FBD) and...

Hello! I am a civil engineering student and have been tasked with creating an enrichment object for elephants at the national zoo in DC. I don't know much about pulleys, and am wondering if there are some mechanical engineers out there who could give me some hints on how to achieve this! My...

Hi, I'm building a toy and I'd like it to spin around a vertical shaft but also move freely up and down while it is rotating. Also, I'd like that the rotating body will get spinned using a gear which will be positioned in a fixed location on the shaft (at the bottom) while the rotating body...

I use this for my backyard hobby (amateur) design work; don't know how valid it is but has always seemed to be accurate. does anyone know if similar downloads for designing other antenna types beside yagi's. just want to have some fun, no specific application.

I have noticed there are a few designs for permanent magnet brushed DC motor, but I can't seem to find the benefits and downsides of either one. The first one (first attachment) uses three electromagnets placed on a triangular rotor. There are two arc permanent magnets on the outside. In this...

Hi, In my electronics class we are learning BJT, Mosfet, JFET theory. My gripe at the moment is that when teaching this you are taught how to troubleshoot and solve for circuits already made. This means you are always solving for various voltages, currents, Gm etc etc. With no previous...

Hello, I am currently preparing myself for exams and I have a past exam question which I can't solve. This question concerns online learning and the following picture illustrates it: Is anyone able to help me out and propose a solution to this question?

Hello all, I am trying to figure out how to calculate the torque on a cam shaft. Say we are looking at this cam and cam follower: If we know that the total force downward caused by the cam follower is, let's say, 50lb, how do I determine the torque required of the cam shaft to rotate the...

QUESTION (2/2) 1) What are some alternatives to iterative design in control theory? 2) I have a certain plant transfer function PTF(s) that is higher order than two and non-unity numerator. I want certain characteristics such as a certain damping ratio (zeta). So I want approximate it as...

I am trying to develop a Ventury https://www.physicsforums.com/javascript: Pump using Compressed Air a d Motive Fluid and Suction Fluid is Water from Shallow Well. Compressed Air parameter is 6CFM Air at 7 bar using 2hp Motor & Compressor set, and required Suction Lift is about 5m. Discharge...

I need to build up knowledge about Design of Experiments and have a fundamental question about the real goal of DoE. Most classical texts start with discussing in considerable detail full factorial design plans where each factor only has two levels. The underlying statistical model is...

Hello, I am currently designing a lightweight waterproof winch system using off the shelf electrical or hand winches. My problem is that most electric winches that are waterproof are too heavy (design weight limit ~10lbs) and have a much higher force rating than needed (design max force ~500...

I need a light weight plastic material, like a string that is no more than 1/8 inch in diameter, that can be sewn into fabric alongside a zipper and spring open when the zipper opens. I would greatly appreciate any suggestions anyone is able to give. I have been trying to solve this design...

The figure shows a differential amplifier with a differential input vid = (vin_d_pos - vin_d_neg) between the bases of Q1 and Q2, and an output (out) at the emitter of Q4. I have to Determine R1, R2, R4, R5 and R6 so that the following requirements are met: R 1 = R 2 Av = vout / vid = 100 [V /...

Homework Statement Homework Equations Clippers equations The Attempt at a Solution I knew that we will put a two diodes( with a dc battery {2.3 V} series) parallel to each other in opposite directions .. but what meant by gain is 0.95 ?

Hello, I am replacing an existing ASME Section VIII Division 1 column. The U-1 states it is designed to 240psig @ 650degF, but does not say anything about being designed for vacuum conditions. The SIS for the column states that it is safe to operate under full vacuum. The SIS is not a code...

For my senior project i plan on litening a vw rabbit car. 1981. Any software that i could uuse to model the care and provide great data on how i could improve the safety after i cut it up to lighten it? Thinking adding roll bars or something.

Hello everyone, first of all, thank you very much for reading. I have to design a container (100 mm of height and 80 mm of interior radius of XPS) to keep a cryogenic mix (water and salt ice) at -15ºC at least for 40min. And my problem is to calculate the optimum thickness of XPS. I've been...

Greetings Everyone, I am lookin forward to design a simple deLaval nozzle to achieve supersonic velocity in lab. I do not want to follow the cfd method or any other software method as of now. If someone could please guide me with calculating the various design parameters of the nozzle like...

So I have no form of engineering education, but I had a hypothesis on an analog mechanical clock being able to account for the effect of gravity on time with a form of super-sensitive weight and scale system to control speed. Has this been done? Either way, any thoughts on the matter?

Hi guys, Working on a 50-ton hydraulic press design using a standard H-frame design, like this: I'm working on the design of the vertical members. Similar to the photo above, the verticals have 1.25" diameter holes drilled for pins that support the horizontal bed. The problem: while...

Hi, I'm looking at a friction hinge design problem. See the image below for details. Looking through a machinist's handbook (pg. 1495), I get a few equations for fastener preload and wrench torque. T = k * Fi * d, where T is wrench torque, Fi is preload, and d is the nominal bolt diameter, and...