Design Definition and 1000 Threads

Jack draws rings of rhombuses about a common centre point. All rhombuses have the same side length. Rhombuses in the first, or inner, ring are all identical. Each rhombus has a vertex at the centre and each of its sides that meet at the centre is shared with another rhombus. They all have the...

hi i want to design michelson interferometer device for measuring small distance movement i am using laser diode with a wavelength 635 nm and power 3 mw can anyone tell me how can i decide the dimensions (from source to beam splitter , for beam splitter to fixed mirror , from beam splitter to...

Hello everyone, I have not been here for a long time. Now I'm here for a DIY project. Purpose: I want to design and manufacture my own road bike and ride it as soon as possible. I want to design nearly all parts on a bike except for the wheels, chain, saddle, cables, maybe shafts and bolts and...

I’m designing a system where a sea water sample must have its temperature controlled between near its freezing point (-2°C) and +30°C to simulate sea temperatures. To control it, the sample will be in contact with a block, which will be controlled by an external circulating water bath. The image...

When designing the structure of an elevated water tube ride (water flows by gravity through a tube large enough to accommodate 2 people on a float, say 500 lb. max. and the volume of water is constant) how much effect does the object floating on the water have?

I would like to share some information related to electric design. Electrical design includes planning, creating, testing and supervising the development and installation of electrical equipment, including lighting equipment, power systems, power distribution, fire and life safety systems...

I need help in selecting best pcb design software out of kicad, eagle and altium. I have to design pcb for my project. But I am having confusion in these software.

Hello! In this webpage: https://onlinecourses.science.psu.edu/stat503/node/35 it describes the 2^k factorial experiment design. I understand that k is the number of factors that we are investigating (in this case two, a and b), 2 are the levels of each factor (+/-) and 2^k=4 is the number of...

Hi, given Sql server executes queries order from, where, group by, having, select, order by. Why don't we write queries in same order? Would that improve speed of execution ?

For my Engineering class I have to work with three other people to design a device that launchers a disc golf. So far we have a basic design plan but we are unsure if it is actually viable. Essentially there will be a platform that holds the disc in place and will be propelled by 2 to 4...

Hello, I'm currently getting my degree in mechanical engineering but have lately taken an interest in electronics. I've ordered several books and have learned a ton about resistors, capacitors, transistors, diodes, etc. However, every circuit I have made so far has been one that somebody else...

Homework Statement For the first picture , i was told that the landing is supported by the beam . So ,when we are doing the load analysis , the load analysis of the staircase and landing are combined . however , for the second example , the landing is said to be the support . so , when we are...

Hey Folks! Just need a quick sanity check ... Putting in a new 4in well and submersible pump ... trying to wrap my brain around the "physics" of it ... Here is what I ***Think I Know*** : 1) The Energy required to move any given volume of water to ground level can be calculated using M*G*H ...

Dear all, I'm currently working on an open core PCB rogowski coil and came up with the following design: I concluded that the asymmetry wouldn't be a problem if the coil is centered precisely around the conductor and cause it's mainly supposed to operate around 50 Hz. Is this a good...

I am looking to try some design ideas using PMs for alternator design. I am a retired EE so I do not have corporate capital for simulation software. Does anyone know of low to medium cost simulation software that might be workable for basic flux/emf/etc calculations and modeling? Or other...

Hi and thanks if you decide to go through this post. As part of a school project I'm analysing a weight stack selector pin used in various fitness training equipment. Its material, length and diameter are known. 1. Homework Statement The pin is placed into a hole equal to its length (from the...

Hi, I'm doing my third year project on diffraction gratings and patterns and analysaing them via computer software and Fourier transforms. I'm going to design my diffraction gratings this week and then create them via taking a picture with a disposable camera and using the negative film. What...

I want to build a bass guitar stand for my guitar using wood, I'm modelling it after the image shown. The alterations I'm making are to increase the height of the legs , to place an attachable weight below the stand . This will allow the stand to have a lower center of mass and will greatly...

Hi, I have read some on the PDEs for fluids, and particularly for rogue waves, where for instance the extended Dysthe equation and the NLSE look rather intimidating: Take for instance the Non-linear Schrödinger eqn: \begin{equation} \frac{\partial^2 u}{dx^2}-i\frac{\partial d...

Good day I've been the task of designing an electromagnet to remove ferrous material from ore mixture. I've calculated the flux density require to remove the particle from underneath a burden depth of 400mm; which is 792.7177 Gauss. (Force index is: 1.5710*10^6 G^2/m) However what I've been...

Hi, I am currently working on a Hybrid Rocket which uses fuel grain as 3-D printed ABS and oxidizer as N2O, but i need to calculate some basic parts such as required thrust to reach specific altitude. I want to calculate the required thrust to reach 1.5km for 10kg rocket with 7cm radius. It will...

I am trying to design a mechanism which has a hydraulic cylinder driven by a step motor. The motor shaft is connected to the hydraulic cylinder piston via two rods of lengths r and L as shown in the below figure. I want the cylinder's piston to be driven at constant velocity v, so I am trying to...

For a traditional circuit simulator, like the free and open source versions of SPICE (i.e. ngspice), it seems to me that they can technically all simulate the same kinds of circuits. Assuming you had a portable SPICE model (either written in SPICE or compiled with ADMS), you could simulate the...

I am a first year high school student designing a project. I want to build a circuitry that enables wet clothes to enter the house once it starts to rain. For this I decided to use a simple water sensor and a motor to move the rope with clothes. But after that I have not found a satisfactory...

I'm designing a valve that uses a ball to seal the valve. When the valve is empty there is no force acting on top of the ball. When water flows in, it will push up on the ball to dislodge it, water will flow into the valve and push the ball up until it seats into the top hole/chamfer which then...

Hi All, I'm trying to design a spring for use in a shock absorber for a college project but my calculations aren't making any sense. I know this is a big ask, but if anyone knows about this stuff I'd appreciate a look. The maximum load is 16.5kN and when it's sitting it will be 5.5kN The...

I have been struggling with this problem for a long time now, and are hoping you can help me. The assignment was to design a mechanism for opening a window with less effort. My way of solving this is to store energy in a spiral torsional spring as the window closes, which would be released when...

Hello, I have been looking to build a pmu similar to this device, it will be for domestic use. https://www.digikey.com/en/articles/techzone/2014/jan/low-cost-microcontroller-based-phasor-measurement-units-improve-smart-grid-reliability I am having a bit of trouble with the sampling part and...

Here is an NY Times article by Carl Zimmer, describing recent advances in predicting protein design. This involves going from an amino acid sequence to a predict a protein 3D structure or going from what you want in a protein to the amino acid sequence that can generate it. This has long been...

Hello, in my final project for System Control i have been stuck for some time on this following task What i cannot figure out is how to make all these condition work at the same time. When I tried designing a PD controller in sisotool or MATLAB for the i and ii part it worked but i couldn't...

Hello All, Very new to design , especially in material selection and rubber stuff. I have requirement where piston/shaft reciprocates to housing at high speeds. In order to reduce noise and for safety reasons, I must add rubber pads on both. Application as below: Red part is the...

Hello All, I am new to designing, and I need to design an air tight tubing with a motor shaft running thru. Following are representative pics: https://www.physicsforums.com/attachments/215901 https://www.physicsforums.com/attachments/215902 Blue arrows indicate air flow direction. Red part...

Designing a PWR core in MCNPX for burnup using 4 folds rotational symmetry to reduce computational time of the core, taking reflective boundary conditions on rotational symmetry planes. should the power be reduced to 1/4th of original power (3000 MWth) in burnup card or does the reflective...

Hi everybody, I'm designing the wing of a new aeromodel and I need a few informations for the structural design of the wing box that I couldn't find in the few litterature I have by now. So, here comes the question... For the sizing of the box beam that will be the main resistant part of the...

I'm working on a public area audio system where we need to install our horn speakers on big height as per their installation requirements. We designed a metal pole as described: Pole consists of two poles: 1) a 7.5 meters height, 10" diameter, 6mm thickness. 1.5 meters are to be buried...

Hello, I have found the technology of spintronics very interesting with a great potential for the (hopefully near) future & I am desiring to experiment with spin waves. I am sure there are several ways to create a spin wave or current, one of which involves placing a platinum strip at the end...

I'm building an electronic circuit breaker as follows, I have some questions about the short circuit protection. I tested it in simulation and it trips in about 11 ms. How would I work out the interrupt rating ?, which I read is the maximum short circuit current the breaker can interrupt...

Please bear with me, I am trying to design a shaft that will be under torsion. I do not know the diameter of the shaft and I would like to be able to calculate it by the things that I do know about the system. There's a 15HP 3 Phase motor running at 85RPM [there's a gearbox] This will be...

Homework Statement given that X is an n × p matrix with linearly independent columns. And $$X^∗ = XA$$ where A is an invertible p × p matrix. a) Show that: $$X^*{({X^*}^TX^*)^-}^1{X^*}^T = X{(X^TX)^-}^1X^T$$ b) Consider two alternative models $$M : Y = Xβ + ε$$ and $$M^∗ : Y = X^∗β ^∗ +...

Hello all, I have been tasked with writing a very short article regarding the use of computers and software in early jet engine design up to modern times. I've been having a relatively hard time finding reading material through Google. I understand that modern jet engine designers use CAD...

Hi all, maybe this is a silly question but I am a newbie in this particular design field. I'm working on a gas analysis system and I'm facing a mechanical design issue. The overall system is made of the electronic board (PCB) with a gas sensors array plus the signal conditioning electronics, a...

Hello, I Have been working as a mechanical engineer for 3 years at an OEM shop and I graduated in 2013. I am the sole engineer responsible for both coming up with designs as well as coming up with assemblies and drawings for the machines and fixtures we create. A pitfall I come across is making...

You've finished with your garden planet and vacation planet, now you want to do something creative.

I am inspired to design civilian submarines for underwater tourism. I want to design a low-cost submarine that will increase accessibility of the underwater world to people who don't have too much money. I think that new materials are needed that will be cheaper but still serve their function...

HAI EVERYONE i have designed a circuit for emg detection but its not working perfectly. may i know the parameters that to be considered in each stages and what should be the value of each parameters in each stages. (e.g. gain at IN stage =20). thank you..

Hello :) (sorry for the bad english, but i really am in need of help) I currently attend a mechanical school in Austria and have to design a new clamping unit for a lid. The circular lid is loaded with a force of 60kN (the force acts on the center) and clamped with 4 units. The currently...

Hello everyone, I am Ashish, a mechanical engineering graduate from Arizona. I am doing a case study on some of the design related flaws in a high purity germanium detector. The information and pictures that I am posting is of an old detector from one of the manufacturers and it is currently...

Hey Everyone, I am starting a new job in a few weeks. I have EE background with strong academic and professional background in power electronics, digital hardware design, control systems and low frequency analog circuit design (<100 kHz). I always joke around that I am an full stack hardware...

Homework Statement [/B] I am to design a 600mL water bottle by drawing one side (bottle lying horizontally). Three types of functions must be included (different orders). The cross-sectional view would be centred about the x-axis, and the y-axis would represent the radius of that particular...

I would like to have some electronics magazines from about 2001 to present. When I was an engineer in the electronics industry I received EDN, Electronics Design, and Electronic Component News. Any of those would work. A few from each year would be fine. Let me know what you have and terms...