Crazy Engineers .CoM: July 2011

Sunday, July 31, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Posted: 31 Jul 2011 10:57 AM PDT

[h=1]Future car technologies[/h]From Wikipedia, the free encyclopedia

The Chevrolet Volt is a plug-in hybrid electric car that went on sale in 2010.

The Audi RSQ sports coupé from the 2004 film I, Robot, envisioned as being motivated by spherical "wheels"

The General Motors Hy-wire hydrogen car on display at the Test Track attraction atDisney World's Epcot

Potential future car technologies include new energy sources and materials, which are being developed in order to make automobiles more sustainable, safer, more energy efficient, or less polluting. Cars are being developed in many different ways.
With rising gas prices, the future of cars is leaning towards fuel efficiency, energy-savers, hybrid vehicles, battery electric vehicles and fuel-cell vehicles.

[h=2]Contents[/h]

[h=2]Advanced control[/h]

Platoons of cars that are controlled by the lead car
Vehicle infrastructure integration

[h=2]Energy source[/h]Main article: Alternative fuel vehicle
One major problem in developing cleaner, energy efficient automobiles is the source of power to drive the engine. A variety of alternative fuel vehicles have been proposed or sold, including electric cars, hydrogen cars, compressed-air cars and liquid nitrogen cars.
In one experiment done to improve the future of cars, a new kind of battery was installed which can be easily removed, and recharged in two different ways. First, by a generator integrated with the IC and second by removing the cassettes so that they can be recharged off-board in the home ( Charters, Watkinson, Wykes, & Simpkin, 2008).
[h=2]Energy saver[/h]Conventional automobiles operate at about 15% efficiency. The rest of the energy is lost to engine and drive-train inefficiencies and idling. Therefore, the potential to improve fuel efficiency with advanced technologies is enormous.
Various technologies have been developed and utilized to increase the energy efficiency of conventional cars or supplement them, resulting in energy savings.

Regenerative braking technology saves and stores energy for future use or as back up power. When conventional brakes are used, 100% of the kinetic energy lost is converted to thermal energy, and dissipated in the form of heat. Regenerative braking recovers some of this energy to recharge the batteries in a hybrid vehicle.
BMW's Turbosteamer concept uses energy from the exhaust gases of the traditional Internal Combustion Engine (ICE) to power a steam engine which also contributes power to the automobile (Hanlon, 2005). This can increase energy efficiency by up to 15%.
Compressed air Hybrid is an engine made by researchers at Brunel University in Britain, which forces highly compressed air into the engine, which they claim reduces fuel consumption by 30%. [1]
Utilization of waste heat from D.W. as useful mechanical energy through exhaust powered steam, stirling engines, thermal diodes, etc.^[1]
Using computational fluid dynamics in the design stage can produce vehicles which take significantly less energy to push through the air, a major consideration at highway speeds. The Volkswagen 1-litre car and Aptera 2 Series are examples of ultra-low-drag vehicles.

[h=2]Materials[/h]

Duraluminum, fiberglass, carbon fiber, and carbon nanotubes may totally replace all steel in cars (potentially improving lightness and strength). Aluminum, carbon fiber and fiberglass are currently being used more in cars today.
Plastic and foam for the car's shell; foam can provide additional safety for pedestrians, ... and can also make the car buoyant.^[2]
Water-repellant glass

Source: Future car technologies - Wikipedia, the free encyclopedia

Do any 1 know how to design a Power Press Machine pls make me move forward

Posted: 31 Jul 2011 02:44 AM PDT

If any 1 know then please help me out & describe me the steps how to start it & r there any books on design of Presses then please let me know about it. Ils an fresher engineer wanted to earn more knowledge please help me out.

Harshad Panchal

CrazyEngineers Forum - Electrical & Electronics Engineering

Microcontroller's
Voice controlling
About Fuse

Microcontroller's

Posted: 30 Jul 2011 09:51 PM PDT

Hello frns...i need some information regarding the microcontrollers...Can we connect to internet using a microcontroller(whatevr the internet connection might be like wifi, gprs, 3g etc...) with out using a pchelp me out...

Voice controlling

Posted: 30 Jul 2011 10:05 AM PDT

hi,
i want to build a robot that could be controlled by my voice. i have found the HM2007 IC that is a speech recognition IC. i also found a schematic for it. i just want to confirm over here, that if someone has worked on it , or has any other suggestions for it, let me know.

here are the schematics

http://www.sunrom.com/files/1180-datasheet.pdf

About Fuse

Posted: 30 Jul 2011 08:29 AM PDT

What is the rating of conventional rewirable fuse, MCB etc.

What is the rating of polyfuse(resettable fuse or PPTC fuse). Polyfuse are normally used in electronic circuits.

Can we replace conventional household power supply main rewirable fuse with these polyfuse. Is it available in such high power requirement?

Pls help.:(

Saturday, July 30, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

heat transfer 2

Posted: 30 Jul 2011 01:36 AM PDT

I want to build a device that can refrigerant the air in a standard roomBut I don't want to build air conditioner or refrigeratorI want to do it in other wayI will glad to receive any idea to how I can do it

CrazyEngineers Forum - Other Engineering Trades

Want to Fly? Print your Plane!

Posted: 29 Jul 2011 06:11 PM PDT

Engineers design and fly 'world's first printed aircraft' | News | The Engineer

CrazyEngineers Forum - Electrical & Electronics Engineering

which motor are better to control??

Posted: 29 Jul 2011 09:54 PM PDT

servo motors or dc motors or stepper motors ??i m controlling using atmega32

Beacon transmitter

Posted: 29 Jul 2011 02:57 PM PDT

Hi does anyone has the circuit of LONG RANGE (few kilometers) Beacon transmitter? :rolleyes:

Friday, July 29, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Engine cavitation
Compressor: Discussion and problem solving.
The Largest Land Vehicle on Earth
6 stroke i.c.engine
robotic arm >acrylic or hardwood??

Engine cavitation

Posted: 29 Jul 2011 09:53 AM PDT

It is sometime that I have been thinking about this topic. I have seen diesel engines which are prone to cavitation. Now I want to calculate *the amount* of cavitation in a single cylinder bike engine.
By the term amount, I mean that I want to measure the cavitation. As we know temperature difference induces pressure difference in a cylinder. Do you have any approach how to do that? Any good ideas are welcome.

As for not, I believe I have to adopt a mathematical approach. In other words suggest me where to start from. :)

Compressor: Discussion and problem solving.

Posted: 29 Jul 2011 09:31 AM PDT

Starting from basic: A compressor is a device used to compress anything feasible. In our case those feasible things are gases or air.
A compressor is an important building block in any power generating cycle which basically consists of four building blocks

Evaporator
Compressor
Condenser
Turbine

So a compressor is a work consuming device. And it is only natural that any design engineer would like to have a device working on minimum possible power. So under ideal conditions, a compressor is always expected to work on an isothermal process. While in reality it is never possible. In worst designer would make it work on isentropic process (imagine a PV diagram). Under practical conditions, the process is a Polytropic process. You can very well calculate the amount of work done required in each case by observing the diagram.

So a compressor (I will restrict my discussion to reciprocating one) is generally comprised of stages. A single stage compressor does have some problem associated with it. A single cylinder will be subjected to very high pressure, this is associated with a danger of leakage past piston and the cooling is also rendered ineffective. The cylinder will have to be robust enough for sustaining such extreme conditions.
On the other hand, a multi stage compressor will have effective cooling in between the suction and delivery pressure and suction pressure. However it should be noticed that efficiency increase obtained by adding each stage decreases with each addition of stage. A compromise must hence be made between efficiency and cost incurred for adding each stage. To give you an example, for adding one stage, you require $100 which will promise you 5% efficiency rise, however the next stage though require $100, will only promise you 2.5% efficiency. So the investment should be worth it. A wise man will always be ready to make a compromise.
Another important component here is intercooler, nothing but a heat exchanger is provided, which cools the compressed air/ gas. It is generally provided between two stages.

The Largest Land Vehicle on Earth

Posted: 29 Jul 2011 09:28 AM PDT

[h=1]The Single Largest Land Vehicle On Earth[/h]The Single Largest Land Vehicle On Earth

‪Bagger 288!‬&rlm; - YouTube

6 stroke i.c.engine

Posted: 29 Jul 2011 04:50 AM PDT

6 strokes engine r used or not.why we learn only 2 n 4 stroke engine
:(

robotic arm >acrylic or hardwood??

Posted: 28 Jul 2011 08:45 PM PDT

i making my own robotic arm parts but the problem is which is best choice to make it???acylic or hardwood?? shud i use cnc machine or leth ?? i will then attach servos in arm so my concern is cheap and light weight material (enough to handle the weight of arm)

CrazyEngineers Forum - Other Engineering Trades

Problems on aerodynamics

Posted: 28 Jul 2011 06:48 PM PDT

A hypersonic experimental aircraft is flying in the lower stratosphere at an altitude of 20 km, at a ground speed of 177m/s.
a)the atmospheric pressure and temperature experienced by the aircraft at 20 km altitude, assuming an isothermal variation in temperature in the stratosphere,calculate
b)the Mach number at which the aircraft is flying.
c)the Mach number behind the shock wave located just ahead of the aircraft nose.
d)the temperature and pressure experienced by the tip of the aircraft nose.

CrazyEngineers Forum - Electrical & Electronics Engineering

Advanced Digital Intercom System

Posted: 28 Jul 2011 07:09 AM PDT

What are the disadvantages of the conventional intercom system?

Thursday, July 28, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

heat transfer

Posted: 28 Jul 2011 01:11 PM PDT

I use this amperage push device for the motor
http://www.datasheetcatalog.org/data...s/sn754410.pdfIn the data sheet write that the Continuous total power dissipation at (or below) 25°C free-air temperature is 2075 mWMy problem is that I don't understand how I need to consider this dataMy motor take 12 volt and 1 ampere that is 12 wattHow I know how much power fall on the amperage push device this is for prevent the chance over the maximum power dissipation ?

project help

Posted: 28 Jul 2011 11:35 AM PDT

i want help regarding topics about aircraft structures

CrazyEngineers Forum - Chemical & Metallurgy Engineering

chemical engineering courses

Posted: 27 Jul 2011 09:59 AM PDT

i am a student of chemical engineering and i want to b a skillfull chemical engineer... Can anyone suggest me about the courses on which i shuld pay more attention... and some softwares on which i should have command...?
i really need help...

CrazyEngineers Forum - Electrical & Electronics Engineering

Problem with USBasp

Posted: 27 Jul 2011 12:24 PM PDT

Hi guys!!
My problem is that my laptop(windows xp based) cannot recognize the usb asp programmer.

When i plug the asp to the usb port i get a message that "usb device attached to the computer has malfunctioned" and since it cannot be recognized,windows is not accepting the asp driver also.

Please let me know what could possibly be the problem??

Wednesday, July 27, 2011

CrazyEngineers Forum - Chemical & Metallurgy Engineering

chemical engineering...

Posted: 27 Jul 2011 09:59 AM PDT

CrazyEngineers Forum - Electrical & Electronics Engineering

hexapod with robotic arm

Posted: 26 Jul 2011 09:05 PM PDT

i need ur help..i m making a project on robotic arm ..mounted on a hexapod (six legs,12 servos)..but the problem is i need to know if the hexapod can handle the weight of robotic arm and walk??

Tuesday, July 26, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

pressure vs velocity

Posted: 26 Jul 2011 02:45 AM PDT

waht is relation between pressure and velocity?
how we can get pressure from velocity(know factor is velocity)

CrazyEngineers Forum - Electrical & Electronics Engineering

Electrostatic Micropump for Lungs patients
AC Inverter
Plasmonics & Its Applications In Electronics & Communications
RF application of graphene devices

Electrostatic Micropump for Lungs patients

Posted: 26 Jul 2011 01:55 AM PDT

I worked on this device for one year and i come up with a very good idea. If anybody interested in this can contact me on CrazyEngineers Forum.

AC Inverter

Posted: 26 Jul 2011 12:51 AM PDT

Hello

How can i use an AC inverter having an output 3x 0-32 VAc to run a 3 phase AC motor with a rating of 230 or 415 V.
How will the voltage be amplified to that level?

Help would be appreciated

Thanks

Plasmonics & Its Applications In Electronics & Communications

Posted: 25 Jul 2011 06:40 AM PDT

what are the apllications of plasmonics in electronics and communication field? or in any other fields

RF application of graphene devices

Posted: 25 Jul 2011 05:54 AM PDT

hi friends,can any one tell me the RF applications of graphene devices.its urgentplease reply immediately.

Monday, July 25, 2011

CrazyEngineers Forum - Electrical & Electronics Engineering

Make library, use it in vb6, matlab video processing.

Posted: 24 Jul 2011 10:54 AM PDT

Hi. i want to build a software , it can traking car using optical flow estimation. i have been success with "m file" in matlab 2010b and using deploytool to make com component, setup MCR. When i add reference in vb6, it ok, but vb6 can'n know some code in "m file",ex : video.ImageDataTypeConverter. I dont know how to fix this problem. help me please.

Sunday, July 24, 2011

CrazyEngineers Forum - Other Engineering Trades

Creo elements

Posted: 23 Jul 2011 10:22 AM PDT

I Want to learn Creo Elements ;can any one Help me ?:)

CrazyEngineers Forum - Electrical & Electronics Engineering

need help in mp3 conversion and watermarking

Posted: 23 Jul 2011 02:52 PM PDT

Hi everyone,
I want to do my final year project in DSP. I need some help on how can i convert a random speech signal (that we can record on simple cell phones or using mike) into MP3 with watermarking.

Saturday, July 23, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Compressed Natural Gas.

Posted: 22 Jul 2011 10:52 PM PDT

can we use bernoulli's principle to calculate the velocity at which the gas is getting dispersed out of the cylinder? if the answer is 'no', then what is the way to calculate the velocity of jet of gas being dispersed out of the cylinder?

CrazyEngineers Forum - Other Engineering Trades

Geothermal Energy - Is It Being Underestimated For Long Time?

Posted: 23 Jul 2011 03:02 AM PDT

I've been following Zeitgeist videos for quite some time now and they seem to be quite optimistic about the usage of Geothermal energy. I stumbled upon this source: Friedmanpedia / Geothermal-Energy-Industry that says

Quote:

In the same aforementioned MIT study, the total extractable EGS (Enhanced Geothermal Systems) resources in the world is estimated at 2,000 Zetajoules (1 Zetajoule=10^21 Joules). In the United States alone, it estimated that there was enough energy to supply the world's current energy needs for 30,000 years

Logically, it seems the obvious and right thing to do. The Earth's core is full of heat energy which is untapped. Why don't we just use it to heat the water and produce electricity?

Do you think Geothermal energy has been underestimated? One of the reasons is that the Oil corporations in the world are proving to be the biggest hurdles in the larger adoption of geothermal energy.

Your thoughts?