Wednesday, December 15, 2010

CrazyEngineers Forum

CrazyEngineers Forum

What is the maximum speed of a car per hp ?

Posted: 15 Dec 2010 01:18 PM PST

I am trying to make electric battery powered car.
I must know what should be the max. speed it can attend for designing required gears and other parts. I know speed depends upon machine rpm and diameter of tyre and gears.
Machine RPM and diameter of tyre are fixed. So only design depends upon gears ?
When I strudied Eicher truck manual with 16 ton total wt. and 147 hp it can get 84 kmph max. speed from there literature. I do not know wether this speed is with full load. ( 10.3 ton payload) It comes to just 0.91875 hp per 100 kg gross wt.
Take Maruti 800 which claims to have ma. speed of 125 kmph with 1000 kg laden wt and 37 hp engines.
My car will have total gross wt 500 kg with 9 hp motor can it travel with max. speed of 90 kmph ? When speed is halfed power required is just 1/4. On Maruti data for 500 kg 18.5 hp for 125 kmph, If power is half 62.5 x 1.44 = 90 kmph
Is my math correct ?
Or is there any formula in Automobile eng. for max./ speed calculation for any given hp+ gross weight ?

Multiple brushless motor control

Posted: 15 Dec 2010 11:40 AM PST

Hello,

what would be the best way to control 4 sensored BLDC motors at the same time? Using 12 PWM channels for 12 phases, as well as 12 pins for Hall sensors is too much. I thought of using 3 4/1 multiplexers for hall sensors, and a single PWM for each motor via AND gates. What do you think?

Thanks

Hi there!

Posted: 15 Dec 2010 11:24 AM PST

Hi,

I'm Marin (male :D), a grad student in control engineering, doing most of my work on AUVs, which is also my main thesis theme - I'm working on a miniature 4 DOF AUV for which I made my own brushless propulsion system based on bldcs used in RC.
I've never been a part of any online control engineering community, and am looking forward to broadening my horizons :), meeting people and most importantly - learning :)

see you!

Which object is needed to make balance

Posted: 15 Dec 2010 09:50 AM PST

JK Lasers Introduce Motorised Zoom Beam Expanding Telescope

Posted: 15 Dec 2010 08:36 AM PST

JK Lasers would like to announce the introduction of the Motorised Zoom Beam Expanding Telescope (ZBET), for use with the newly enhanced JK604D drilling laser. The ZBET has been designed to rapidly and remotely change the laser's beam size and focus position using the integrated LaserView software, which is supplied with all of the company's Nd:YAG lasers.

Using the Zoom BET, the magnification of the laser can be continuously driven from 1-4X in less than 5 seconds, which can considerably reduce set-up times and enhance in-process flexibility. This new product also has a very low beam wander, whilst maintaining diffraction limited performance across the entire expansion range.

With optics that have been optimised for high peak power operation, the Motorised Zoom Beam Expanding Telescope is the perfect addition to the newly enhanced JK604D industrial laser.

For further information about the Motorised Zoom BET or the JK604D, contact JK Lasers at sales.laserdivision@gsig.com.

-END-

JK Lasers provide innovative industrial lasers and laser processing solutions for the medical device, aerospace, automotive, electronics and semiconductor industries. With decades of industry knowledge and an extensive portfolio of lasers, JK Lasers can help manufacturers to choose the most suitable solution for their cutting, welding and drilling requirements. For further information please visit, Industrial Lasers & Laser Application Solutions | GSIG Lasers

Intelligence

Posted: 15 Dec 2010 08:14 AM PST

This might seem an absurd question:

What is YOUR definition of intelligence?

Do you agree to it that a talented person must be intelligent or an intelligent person must be talented?

J2EE Tutorials

Posted: 15 Dec 2010 08:08 AM PST

hello friends can anyone help me find some notes or tutorials on J2EE and Eclipse Software.

WordPress Coding/Design Project: Anyone Interested?

Posted: 15 Dec 2010 07:24 AM PST

CEans,

If anyone is familiar with WordPress coding, get in touch with me via admin [at] crazyengineers [dot] com. I've a short (over-the-weekend) assignment for you. It's a paid assignment.

I've a small, urgent redesign project for you.

If you have done prior design/coding work in wordpress, give me a link to your portfolio.

need help in matlab coding

Posted: 15 Dec 2010 07:21 AM PST

guys can anybody give matlab coding .i am doing project in call admission control in mobile communication using matlab.need coding regarding this .

Hello World

Posted: 15 Dec 2010 07:02 AM PST

Hi all. I'm Dan (Chemistry background, materials engineering postgrad)from East Africa. I have already read some fantastic posts in the forums and I hope to be a part of this thriving community of problem-solvers. Particularly interested in "energy", "clean water", "futuristic materials".

Hobbies: Reverse-engineering natural/artificial products.
Interests: Small scale biogas (and biodiesel) production, Ethanol synthesis etc.

Happy Holidays!

Dan

Google Music Search

Posted: 15 Dec 2010 06:17 AM PST

Has anyone noticed new Google Music Search for Bollywood music on google.co.in

It contains latest Hindi songs Repository.

:)

Hi I am Paritosh Ahuja

Posted: 15 Dec 2010 05:14 AM PST

Hello guys i am paritosh ahuja doing B.tech(ECE), now into final semester besides being and ECE'n i also have interest towards programming languages, i recently completed my JAVA course and now i am Oracle Certified JAVA programmer. And i hope i'll be having a great time out here with all you guys... :cool::p

Find the common thing in all the words.

Posted: 15 Dec 2010 04:36 AM PST

Though its a very simple one,but needs your sharp attention.
See if you can figure out what these seven words all have in common?

1. Banana
2. Dresser
3. Grammar
4. Potato
5. Revive
6. Uneven
7. Assess

solar Glass

Posted: 15 Dec 2010 03:51 AM PST

Can anyone plz explain me how solar glasses work. I was in a recent industrial training to saint gobain, got really interested into finding that ..

Use of ammonia cycle in steam power plants

Posted: 15 Dec 2010 03:35 AM PST

Steam Power Cycle is used generally in Thermal Power plants. Suppose we replace water with Ammonia . I think it has the property of evaporating quickly when the temperature is slightly increased. I mean it evaporates at a pretty low temp itself. So, can ammonia be used to drive the turbines. It can also be recovered as in the Vapour absorption Cycle used in Refrigerators. Give some suggestions if anything could be done!!
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