Drive Definition and 496 Threads

Hey everybody, I'm from Argentina and going to college soon. I'm stuck between physics (mainly for contributing to interstellar travel) and electronics engineering. The thing is, I'd only study physics if there's a slight chance of witnessing warp drive/wormhole technologies in this lifetime...

Hi all, I read an article about Harold White's Warp drive experiment at Nasa (http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20110015936.pdf) I understand the basic idea of the experiment - to try to create small pertubation in spacetime and measure it using the interferometer - but I...

An Alcubierre drive as I understand it is based on the idea of dangling a carrot in front of a horse with one hand and lighting its tail on fire with the other. Its desire for the carrot and its aversion to the fire drives the horse forward. The salient difference is that an Alcubierre drive...

There are two solutions to Einstein's equations that allow for warp drive. One is the Alcubierre warp drive and the other is the Natario warp drive. What is the difference? Is the Natario warp drive better suited for a real life application than the Alcubierre warp drive? Here is a paper in...

1.What would be the effect of the following factor on the maximum power that can be transmitted. (give reasons for your answers) Increasing the included angle of the pulley groove. 2. What would be the effect on the following if the load torque is increased and the speed maintains constant? The...

Hi guys, I was just wondering if any macbook pro owners have successfully converted the optical drive into an area to hold an SSD. I am planning on keeping my current HDD and adding the SSD. Please let me know how it went and how much it affected the performance. (2012 MacbookPro non-retina)...

Consider a 1200kg car cruising steadily on a road at 90km/h. Now the car starts to climb a hill that is sloped a 30 deg from horizontal . If the velocity of the car is to remain constant during climbing, determine the additional power required that must be delivered by the engine. KE=mv2/2...

greetings...! I need some correct info for a project I am working on... this site looks like it may well be able to help me . the problem is as follows; I have a 12'ft. wheel that I need to turn at a maximum of 60 rpm. the shaft from the power supply turns at 2300 rpm. what would be the gear...

The Drive terminals are connected to a PWM signal generated by an arduino micro controller. The purpose of this circuit is to isolate the arduino from the motors to avoid too much current being drawn. What I understand so far: The motor will only turn when the diode is reverse biased. When it...

A possible breakthrough for space travel, yet lacking an explanation in physics, they say. http://ntrs.nasa.gov/search.jsp?R=20140006052...

Hello, I'm in a design project of a cart. i want to decide a geared motor power and RPM. but I'm in a trouble with this because I'm unable to calculate the motor with radial friction.the cart is with steel wheel and drive on steel rails. place help. Total weight cart+carrying material - 4.5 Ton...

Here's an excerpt from an upcoming chapter of my hard science fiction novel Flashover. I was wondering if this is plausible. I'm sure I must have made a mistake somewhere, and I was hoping that someone would kindly point it out. Remember the song Lasso the Moon? The capsule would actually...

Would a spaceship that is half reflective ( the stern ) and half flat-black ( the bow) be propelled through space just by the ambient radiation from stars and the CMBR?

Hello All ! Above is the title of the topic and am looking for inputs. Right now I am working on this as my thesis. And I am looking for some one how have already worked in the similar field for a better guidance for me. Thank you in advance. Regards,

I have a linear slider with the following specs: Max allowable dynamic moment: 36.3 Nm Load capacity based on acceleration of: 0.3G Offset distance from center of slider to center of load: 305mm Mass of load: 50lb I did the following calcuation 36.2N*m = X(Kg) * 305mm * 0.3G *...

Hey guys! I am currently creating some automated snips for trimming plants. I am using auto desk inventor to design it all. The design and concept is solid and modeled/animated to show proof of operation. However now i want to try prototype - i can sort out everything aside from the gear. I...

Hello all I am very new to this sight and am not an engineer. I am a mechanic tasked with building a powered drive system for our heat treat car. We currently use a continuous cable loop drive but we would like to change it to air powered gear motors. My question is this, how to size it...

Hi! I would like to change my work truck into an electric hybrid. I have all the electrical portions of this project handled. My big problem is somehow connecting the motor to the drive shaft. The motor is going to sit in the bed of the truck. Its a twelve foot box truck, the motor will sit...

So, this has really stirred my interest. To be clear, I'm not citing these as sources, simply linking for discussion; An article on the subject, And the abstract. Talking about this elsewhere I seem to find no shortage of objections. But to me it seems fundamentally pretty sound. One...

Hey all. I'm getting a new hard drive in tomorrow and I was wondering if there was any software that would copy everything from the old hard drive to the new one without having to re-install windows. Any ideas? (Or other methods of keeping all of my current data and settings in windows on a...

Hi everyone, I've acquired a cheap ultrasonic probe (advertised as for a thickness gauge.) It's a temperature resistant probe up to 300C and operates at 5MHz. It came with no documentation or means to drive it. It terminates in two LEMO 00 connectors, and I've acquired 2 LEMO 00 to BNC...

Homework Statement Image Homework Equations KCL DRIVEN RL CIRCUIT The Attempt at a Solution I got the right answer after trying a different tactic, but I don't understand why it is done this way. My first approach: KCL: 100/45 + 60/2 = iL for t < 0 32.22 -...

I was thinking about adding a pedal powered propeller to a kayak and I had an idea:Use a hydraulic pump/motor combo to simplify the design. That way I could have the pedals in front of me and easily route some hydraulic lines to a propeller in the back. I came across this gear driven...

Well, this is really bad. I have an ASUS DVD player and it gave really great service for about 5 years. But lately, it's behaving oddly. It can recognize some DVDs while it can't play some others! The green light on the drive goes on blinking and then eventually it goes off. The drivers are all...

i have a TT earthing system and to decrease the resistance of the system I'm connecting the rods in parallel. i have the earthing conductor connected but as a mean of security, I'm thinking of connecting a second earthing conductor from the rod to the main Earth bar. Does this cause a any...

Hi all! Basically I will soon be required to measure the torque required to drive a plunger pump which operates by an eccentric cam on the pump's driveshaft pushing a plunger up and down. So obviously the torque will vary through the driveshaft's revolution. The setup is as follows: Motor...

Hi, I'm trying to choose the right motor for a test rig I've built. I have a shaft attached to a cylinder that weighs 6kg, and I need to know how much torque would the motor I'm getting need to be able to produce in order to rotate the cylinder at 100RPM. My attempt: Torque = Force x r...

In a V-Belt Drive, it is said that when a New Belt is installed, the Tension Ratio shouldn't exceed 5:1. But isn't this ratio beyond control and is defined by T1/T2 = μ*α*cosecβ where T1/T2=Tension Ratio, μ=Coefficient of Friction, α=Angle of Wrap, β=Groove Angle of V-Belt. All of these variable...

My work has a drive shaft that has been breaking on a U-trough screw conveyor. I am looking for some helpful equations to find the torque on the shaft so I can accurately model and optimize the shaft in SolidWorks.

I want to turn an axle or a wheel using multiple motors. With a single motor, sometimes the power is not enough. Is there any method to use two or more motors independently driving the same axle or wheel ? The idea is to have contributions from all the motors so that the axle or the wheel gets...

Hi. I'm curious about this: The supposed "warp drive" by Miguel Alcubierre is supposed to go faster than light. But, isn't it a warp in spacetime? Doesn't that make it like a gravity wave? But gravity waves can only go the speed of light, right? So how can the warp drive go faster?

motor specs are.. dc motor single phase 24 volts 49.6 amp 3000rpm, 1hp dynmo specs are: dynamo 1500 rpm 31.5amp output current 8hp shaft of motor 1.3cm diameter and dynamo 3.5cm approx please tell me the ideas to drive the generator? give explained answers

I'm not sure if this is the right forum. I'm sorry, but I'm not good at Physics or English (which is not my first language). I was just wondering, after watching a show on the Discovery Channel that mentioned the Alcubierre Drive. Then I went on the internet and read about it and all the...

Evening gents, We've built the following circuit in the lab for our DC-DC converter for an electric motorcycle. The blocks from left to right are, High speed optoisolator IR2110 Gate driver IC MOSFET Power buffer circuit MOSFET Power Module PMDC Motor ~48V...

If warp drive was possible, how could it affect the orbit of planets that are close to the warp? I'm not sure how to define how close. Is there a minimum distance the spaceship would need to be from other planets, so that it has no effect?

Hello Everyone, I am interested in getting some feedback and opinions on a project I have designing a 4 wheel drive buggy. The application is pretty specific and i would like it to meet the following: - max speed 30-40kms/hr - weight 800kgs - mainly operates at 0-15kms/hr - only runs 5mins...

Homework Statement While learning to drive,you are in a 1200 kg car moving at 20.0m/s across a large,vacant,level parking lot.Suddenly you realize you are heading straight toward the brick sidewall of a large supermarket and are in danger of running into it.The pavement can exert a maximum...

Hi, I understand that the PWM inverter drive system first uses a diode bridge rectifier in order to convert the AC incoming into DC before using an inverter to convert this DC into PWM for use on the induction motor. Could someone please explain in simple terms how the PWM inverter section...

Homework Statement A racecar driver must average 200 km/h over the course of a time trial lasting ten laps. If the first nine laps were done at 199 km/h, what average speed should be maintained for the last lap? Homework Equations avg =distance/time The Attempt at a Solution He...

I hear this term a lot but couldn't find much from a google search My initial guess is that we put a AC current through a inductor coil to create a magnetic field. Am I close?

I have been pondering about the concept of the warp drive and my intuition can't seem to understand the idea fully. I will try to exlain what i have found out so far. To keep everything simple and stripped down to only the bare essentials, let's discuss about it in one-dimentional universe...

Some sources say, that alcubierre warp drive would have no need for exotic matter but to create a warp bubble around a shuttle-sized spaceship would require only 100-500 kg of antimatter. Still some believe it would not function without exotic matter and some positive energy. The question is: Is...

I'm sure you've heard of the warp/Alcubierre drive that would work by expanding space behind it and contracting it in front to achieve faster than light travel. I was thinking about this the other day and was wondering if this concept could be applied to time as well to allow time travel. Would...

Alcubierre Warp Drive With Rings Story Research I'm writing a new section in my science fiction novel and need a little help with the science of it. So, the general idea of the Alcubierre Warp Drive is that with 65 exajoules you can create a warp bubble by expanding spacetime behind you and...

I can't go into detail right know - but the thing is: in order to make a real antimatter engine one would need to make a loop of SCs wire r = 70 m, where r(wire) is approx. 20 cm. I need to generate about 10 T in the center of the field, that is 70 m from the nearest wire. How much mechanical...

Hi all The title pretty much says it all... The slider is required to push and pull a load of 70N. Radius between centre of crank axle and connecting rod is 12mm. I have been unable to find a formula to calculate torque required to enable selection of an appropriate motor to drive the...

Hi I am looking for an external USB CD/DVD R/W drive for my laptop as it does not come with one. I look on Amazon and they only say DVD drive. How do I know whether it can R/W both DVD and CD? Here is the link for...

I just realize my new laptop has no CD or DVD drive. I need to load anti virus and other programs in. I know all I need is to go and buy a USB DVD drive. But is there any way for me to copy the content of the DVD or CD into a USB flash drive using another computer. Then plug the flash drive into...

I'm wondering what the difference is between a VFD and servo drive are. I'm pretty familiar with VFDs but not so much with servo drives. From what I read, would the following assumptions be correct? A variable frequency drive without an encoder module will adjust the frequency and amplitude...

Assuming that the early inflation of the universe is driven by the potential energy of some inflaton field(s), the "normal" matter is created only after this rapid inflation has stopped by conversion of the latent energy of the corresponding phase transition to particles. Does this mean that...