Design Definition and 1000 Threads

hello, new here but need a hand figuring out a problem that is above my knowledge, i am currently building a kayak loader for myself like the one pictured below, i am trying to figure out where to place the spring and how heavy of a spring i need to help assist the kayak onto my roof, i am sure...

Hi all, I just want to throw some ideas and get feedback from the community on refrigerator door design. If anybody notices in supermarkets, etc, the frozen food are kept in glass-doored refrigerators. the prupose of the glass door is so the customers can see if the stuff they're looking is...

Can anyone recommend a good book on weld design? I'm not looking for a general textbook on welding. I want something that specifically targets the design of joints and weld choices. Something like the welding chapter of Shigley's Mechanical Engineering Design, just much more in depth.

I am a first year Mechanical Engineering Major I am wondering if there are any good computer program that I could use to simulate the physics and properties of potential designs The other day I saw something about Da Vinci's famous cryptex and this peaked my interest into designing and building...

Hi, do large nuclear power design companies ask for high GPA/Average ? companies like terrapower Westinghouse...? Is a successful engineering career linked with high gpa/average ?

Hi.. I want to know how can we specify the data(electrical) passing through cable that we are designing in CST design studio to test the effect of EMI on the data passing?

Hi, My teacher asked that i should design a efficient energy storage system for a plug-in electric vehicle. I have no idea how i can use some equations for designing this type of car. The requirements are in below; Test cycle range: 140 miles Test cycle energy: 260Wh/mile at the output of the...

The situation is part of a mechanism I have been working on. It is used for a bicycle to automatically store and release energy with a spring. It is somewhat similar to a car clutch. Homework Statement Two friction discs are rotating with different angular velocities and different torques. The...

Hello all, I need to design an automated trap door opener incorporating a motor and at least one of the following: gears, springs, or power screws. It is 36 inches wide and 48 inches long. It is hinged along its width. The door weighs 60 pounds. When closed it is flush with the floor. It must...

I'm interested in the knowledge that was available to aircraft engineers in the period 1900-1920. specifically the thermodynamics and mechanical engineering knowledge generally available, like in how much detail were the calculations on the performance, or the cooling of engines done, how...

Hello. I have a following C programming language code that blinks an LED ON and OFF. #include<bcm2835.h> #define LED RPI_GPIO_P1_12 int main(int argc, char **argv) { if(!bcm2835_init()) return 1; bcm2835_gpio_fsel(LED, BCM2835_GPIO_FSEL_OUTP); unsigned int delay(1000); while(1)...

I was wondering all the assumptions I need to make regarding a design for a heat exchanger and cooling tower design from a IC engine testbed. Each engines average output is 55kW and the water jacket temperature is 80 degrees (C) and has to be cooled to 65 degrees (C). The ambient atmospheric...

Homework Statement I've gone though a material selection process to pick the optimum material for a rear leaf spring suspension for a vehicle (~700mm long) and I've selected the top 10 materials based on fatigue, fracture, toughness, cost, yield etc: -Stainless steel, martensitic, AISI 440B...

Hi, I am struggling with this a bit. I think this will work but I am not sure. Can you guys take a look and see if I have made any obvious mistakes. The B+ voltage should be around 480 VDC loaded. I am still working on the channel switching. [PLAIN]http:// Thanks, Billy

hello everyone, me and my son have been slowly working on a design project of our oun. We are trying to build a fully working Crescent Rose (without the razor sharp edges and firing pin to shot bullets) build out of machined metal components or 3D printer. If you don't know what a Crescent...

The engine of a solar car I am designing(for my fictional stories but I would like a scientific point of view on this) is literally a DC circuit combined with mechanical force. First of all, there is a rechargeable battery. I would say it is about 24V fully charged. There are 2 wires coming off...

Hello, i am a high school student who is interested in physics. Me and my friends want to build something cool. Can be anything related to science. Nothing too complicated but nothing too easy. Something interesting and safe. No dangerous suggestions please. I do not have any qualifications as i...

Homework Statement For the plant: ##G(s)=\frac{1}{s(s+2)(0.4s+1)}## Design a controller in Matlab such that ##K_v=4## , phase margin = ##60^o## and zero steady state error for step input. Homework Equations ##e_{ss} = Lim_{s->0} \frac{s R(s)}{1+D(s)G(s)}## Lead/Lag...

hello, a bit of topic. we're having an exhibition at my university to display outstanding papers. my paper was about my passion for mathematics. I am seeking some ideas to make visitors want to read my paper. I don't want something too childish. I was thinking of making a string model of some...

I am intending to design a CD nozzle that produces 20mN thrust under atmospheric conditions. The reservoir pressure will be 1.4 bar, and the ambient pressure will be 1 bar. The other variables are adjustable. This will in the end be sent out for fabrication.My process is as follow, May I know...

Homework Statement I am trying to design a 5-bit sequence recognizer. The circuit has to detect two sequences of bits. The first sequence is 11001. The second is 10010. The output when no sequence should be 00. When the 1st input sequence is detected, the output should be 01. When the second...

Homework Statement I'm doing an assignment on cathodic protection systems using solar energy and have no idea on how to construct an efficient system. All the ones online are too basic and don't specify whether the panels are in series or parallel or not. I've calculated that the system needs...

How would you write the vector loops and geometric constraints for this mechanism?

I wasn't quite sure which section to post this in but engineering was the closest to my application, although this could be a basic physics question. I'm not sure. I want to learn how to design a counterbalance such as that in an engine crankshaft. This mechanism has been of interest to me...

Trying to design a motor for a learning project. Finished the math but having a lot of trouble with design questions. Can anyone give me some insight. For the rotor in this picture there is a ring magnet. Is the magnet glued on? I think it is glued onto electrical steel. 2nd question, on the...

Hi everyone my name naresh. I'm doing post graduation, currently working on my project. I've completed all the calculations for it, but i have a small doubut. I've designed a mobile truck loader for which I've taken partial factors 1.35 and 1.5 for dead load and live load respectively. but BS EN...

Hi, I am a mechanical engineer who has worked only in start-ups, for past 3 years. Main experience is Mechanical design CAD with bit of FEA. Problem is I want to move to a more traditional company. I had had an interview with one of the largest oil and gas company for role of design engineer in...

Hi, people of PF I'm trying to decide between concentrating on continuum mechanics or design/manufacturing for my master's degree. My goal is to ultimately work in the industry, so design/manufacturing seems to make a lot of sense. However at the same time, continuum mechanics (and physics in...

Hi, I'm going to pose my questions with a number of assumptions, so please pick me up on any that are wrong. I want to know the design choices behind electric trains historically and current, this will mostly require some context of induction motors and inverters. I don't know exactly how EMUs...

hi, im trying to design a printed (microstrip) dipole. Im currently having a hard time finding some good information on how to design such a printed dipole antenna. I would really appreciate some help/hints in form of links/books/equations that can help me to design such an antenna element...

hi there,im pretty new to antenna design, still have a lot of theory to go through, so please be kind. ;)I have to design a linearly polarized microstrip patch antenna (rectangular) that is fed with 2 coaxial probe feeds. The patch should be a square (L=W), so i can place 2 feeds orthogonally...

Hey guys (and ladies), I am a junior year EEE student at CSU Sacramento and am hoping to get a job in audio amplifier design as a career after graduating. I have always loved music and electronics and working in this field would honestly be like a dream come true. As far as my experience in...

Hi Could anybody guide me to a software that can be used to design a non linear spring from load deflection characteristics. need it for both extension and compression spring. thanks noor

In general calculations of gear design, addendum is taken as a factor of the module of the gear such as equal to module or 0.8 times the module and dedendum is taken as 1.25 times the module. Why are both these defined in terms of module? How did we reach to this conclusion?

I'm given this problem to solve with the assumption as stated above. The answers need not be logical as long as the linkage mechanism can be simulated. I've attempted the question using Mercedes Mono Wiper mechanism but only manage to cover 41% given the width of the wiper. May I ask if there...

I'm a Mechanical Engineering student intending to pursue a Master's Degree in Aeronautical Engineering after college, and Machine Design is one of the disciplines I'm going to take next year. I understand the importance of various topics in mechanical engineering to an aircraft project (topics...

I need to design and find suitable specifications for spur gears for a two stage reduction gearbox. The gearbox has to transmit 5kW at an output rotational speed of approximately 125 rev/min. The gearbox will be driven by a separate mains 4 pole synchronous electric motor . The required...

Hi. I was browsing Wikipedia on a topic, went to magnetic bearings, etc etc...ended up on synchrotron radiation then the phrase about how a moving or accelerat/ing/ed particle passing through a magnetic field generates electromagnetic radiation. Then I has a revelation. How to get a particle...

I'm trying to make a pizza oven, but rather than brick or refractory, steel. I want to use a hemisphere and have it fed by pellets. I've been told by people on wood oven forums that I won't get the heat needed. I'm wanting 900 F at the hearth of the oven, using pellets for heat (roughly 8000...

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...