What is Machine: Definition and 966 Discussions

A machine is a human-made device that uses power to apply forces and control movement to perform an action. Machines can be driven by animals and people, by natural forces such as wind and water, and by chemical, thermal, or electrical power, and include a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement. They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems.
Renaissance natural philosophers identified six simple machines which were the elementary devices that put a load into motion, and calculated the ratio of output force to input force, known today as mechanical advantage.Modern machines are complex systems that consist of structural elements, mechanisms and control components and include interfaces for convenient use. Examples include: a wide range of vehicles, such as automobiles, boats and airplanes; appliances in the home and office, including computers, building air handling and water handling systems; as well as farm machinery, machine tools and factory automation systems and robots.

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  1. J

    Physics / Statistics question related to Atwood Machine and calculus of g

    Hello everyone. I am a 12th grade Portuguese student and have a theoretical question to pose, which is probably more related to maths & statistics. In our class, we made an experiment with an Atwood Machine and deduced the formula for the acceleration of the system (ignoring the string's...
  2. L

    Time Machine will not be invented

    :smile: Hello people, Time Machine will not be invented. We will never travel in time, not in future, not in past. Why? If time machine will be invented then why no one travel to us from the future and say "Hello"? They fear that harm the past? Then let they send us some device from...
  3. I

    Atwood's machine on an inclined plane

    I know this has been asked before, but it was never really clearly explained.. The problem is as follows: Homework Statement What is the acceleration of the system shown in the diagram if the kinetic coefficient of friction is 0.15? [diagram attached.. if not visible, it is an incline plane...
  4. B

    Turing machine and quantum computers

    Can anyone help me...from Nielsen-Chuang "quantum computation and quantum information":how might we recognize that a process in nature computes a function not computable by a turing machine?
  5. B

    Turing machine, computable function.

    From Nielsen-Chuang:how might we recognize that a process in nature computes a function not computable by a turing machine?
  6. A

    Theoretical Acceleration of an Atwood machine

    Homework Statement The descending mass of the pulley system (atwood machine) is 60g and the ascending mass is 55g. Using DataStudio to measured the slope of the velocity over time (read by the spinning spokes of the pulley) the acceleration (constant) is experimentally given as 0.316m/s^2...
  7. V

    Creating a Bit Detector with Mealy Machine: State Diagrams & Tables

    Homework Statement I have to make a scheme of a bit detector that detects the bit "1101" with a Mealy Machine. So I have made the following state diagram and state table(picture 1 and picture 2) http://img215.imageshack.us/g/picture1jf.png/" Now I don't know what happens in picture 3. How...
  8. J

    Finding g from Atwood's Machine

    1.Homework Statement Two masses hang from a string running over a pulley. Such a device can be used to measure the acceleration of gravity; it is then called Atwood's machine. If the masses are nearly equal, then the a of the masses will be much smaller than g; than makes it convienient to...
  9. V

    How Does Friction Affect the Timing in an Atwood Machine?

    Homework Statement It appears that the subscript is not working properly, please take m1 to means mass 1 and m2 to mean mass2 Atwood's machine consists of two masses connected by a string that passes over a pulley, as show in the figure. Consider the pulley to be massless and frictionless...
  10. A

    Atwood's machine with 3 masses

    Homework Statement A pulley is massless and frictionless, 2kg, 3kg, and 6kg masses are suspended. The 2 and 3 kilogram masses are suspended on the left side of the pulley (the 2 kilogram mass on the bottom) and are connected by a cord of negligible mass that does not stretch(T1), the 6kg mass...
  11. M

    Calculating Mass of Atwood Machine to Keep It Still

    In the Atwood machine, what should M be, in terms of m1 and m2 so that it doesn't move? [PLAIN]http://img163.imageshack.us/img163/8288/atwood.jpg My work: It doesn't move, so I said T1=Mg (T1 is the tension in the rope attached to M), I believe the tension in the rope connecting m1 and m2 is...
  12. L

    Machine programming a 7segment LED

    Hello, Lately I've been trying to gain an understanding of processors/cpu's and the very lowest possible code you can engineer. I decided I would do a thought experiment where I would distill the computer down to the most basic level I could conceive, and decided that such a computer would...
  13. A

    How Does Power Factor Change with Field Induced EMF in a Synchronous Motor?

    Homework Statement A star-connected, 3-phase, 100kVA, 415V, 50Hz synchronous motor having a synchronous reactance of 1.2ohms and negligible resistance operates at its rated terminal voltage, rated current and per-phase field-induced emf of 228V. Determine the power factor. The excitation...
  14. S

    Need help designing a dumpling machine

    As a fun project, I'm trying to design a mechanical machine as simple and elegant as possible to "crease up" a round flat piece of dough around a meatball. Any suggestions how this could work? If you know a better place where I should ask for help, please tell me. P.S. You will notice that in...
  15. A

    Atwood Machine and the Work done

    The two block in an atwood machine have masses 2kg and 3kg. Find the work done by gravity during the fourth second after the system is released from rest.I have attached my attempt here..Kindly tell me where I went wrong. I am sure that I didnt go anywhere wrong in finding the acceleration and...
  16. A

    3 Phase Machine Line Current problem

    Hi guys, I would really appreciate some help with this problem(probably quite easy for anybody with Electrical Engineering experience). Thanks in advance Homework Statement A 415V, 50Hz, 3-phase supply is connected to a 3 phase load of 10kw with a power factor of 0.8 lagging. Find the...
  17. C

    How can I build my own EEG machine?

    As useful as an EEG machine would be for me, I can't afford to buy one but I'm going to build one in the near future. There is a lot of information on this site http://openeeg.sourceforge.net/doc/ and from what I've read so far, building an EEG machine is no simple matter. Not for the layman...
  18. S

    Constraint Equations: Atwoods Machine

    Can questions like the one given in the following pic be solved by taking the reference frame answhere in the middle of the string and not on the fixed pulley?(http://cnx.org/content/m14731/latest/pq8.gif) A somewhat similar method has been given in http://cnx.org/content/m14783/latest/"...
  19. H

    Need help to read and understand machine drawings

    i am a mechanical engineer. but, i am not good in machine drawings. i can not understand the assembly drawings. i can not visualize the 2d drawings into 3d drawings. if anybody knows the perfect method to understand and read machine/assembly drawings then please inform me.
  20. K

    Why is my state machine output being synthesized away?

    This is my first state machine that has an input large than one bit. The simulation tool says that I synthesize my output away. I think I understand why, but don't really know how to fix it. library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; -- entity trimoore is...
  21. R

    Good books on machine design and heat transfer

    Hi Tell me some good books on machine design and heat transfer. What about Machine design by Norton?
  22. D

    Number crunching machine on a small budget?

    I'm looking for as much computational power as possible for maybe 2-3 grand. This looks like a nice setup fit to the purpose, but I thought it would be good to ask and see what other people know or have been doing. (fyi I'm not really a hardware guy myself) Glad for any input!
  23. U

    Atwood machine bounce, how high?

    Homework Statement Basically, an ideal Atwood machine is released from rest (m1 != m2) and I have to find out how high the mass, say m1, bounces after an absolutely inelastic collision with the floor (no energy is lost). Homework Equations Conservation of energy, Newtons equations...
  24. E

    Inventor Discusses Rotary Machine with Eccentric Piston

    Hi, I am industrial automation engineer,I am 52 years old and I am from Romania. I would love to talk with you about "ROTARY MACHINE WITH ECCENTRIC PISTON" ,I like to say:"rotary piston" I asked the name "Rotary Piston" but the Patent Office has given the name:"ROTARY MACHINE WITH ECCENTRIC...
  25. Y

    Porting linux application on cray machine

    I am trying to deploy my oceanic model currently runing on ubuntu linux and compiled with intel fortran on a cray sv1 machine with UNICOS operating system. It actually went quite well until i tried to read unformatted files. i am using the following code to export the data to the new machine...
  26. M

    Average power output of machine

    Homework Statement what is the average power output of an engine lifts a 250kg mass a distance of 30.0m in 20.0s? Homework Equations Ek= (1/2)(m)(v^2) Ep=mgh Ew=fnet x distance Es= (1/2)kx^2 The Attempt at a Solution Ep+Ek=f x d (.5)(200)(3)^2 + (200)(9.81)(5)= fx5.00...
  27. A

    Atwood machine, solve for angular acceleration

    Homework Statement The goal is to solve for angular acceleration with the end variables being m1,m2,m3, R, r, g. M2 > M1. An atwood machine is a pulley with 2 masses, one on each side. Homework Equations Tnet = I * angular acceleration Fnet = ma The Attempt at a Solution I know...
  28. I

    Mechanics - massive pulley, Atwood machine or similar

    hi, why does a massive pulley cause different tensions in a length of cable? I've looked for answers but got only that "the pulley needs to be lifted". Couldn't really picture it. Some maths would be nice :smile: cheers!
  29. B

    How do the masses and pulleys affect the motion of a double Atwood machine?

    Homework Statement My question is about a double atwood machine like this: http://farside.ph.utexas.edu/teaching/336k/Newton/img1915.png Now imagine that m1 = 5m, m2=2m, m3=3m My question is: why does the upper pulley rotate despite the fact that the masses on either side are...
  30. R

    Machine Design Textbook problem

    If anyone could walk me through any of these or provide any help I'd appreciate it. Thanks I owe you one. Homework Statement Homework Equations The Attempt at a Solution
  31. S

    New Flying Machine Idea - Is It Possible?

    This may be a bit weird but please consider my idea.. Flying Machines like the aeroplane work on the principles of aerodynamic lift employing a special wing structure. What if I make an alteration to this design such that these "wings" are replaced by moveable "curved surfaces" like the...
  32. P

    Energy and pulleys (Atwood's machine i think)

    Homework Statement The pulley in the diagram has a radius of 0.160 m and a moment of inertia 0.480 kg.m². The rope does not slip on the pulley rim. Use energy methods to calculate the speed of the 4.00 kg block just before it strikes the floor. Homework Equations The Attempt at a...
  33. T

    Find Mass of Pulley in Atwood's Machine Homework

    Homework Statement The two masses (m1 = 5.2 kg and m2 = 2.6 kg) in the Atwood's machine shown in The Figure are released from rest, with m1 at a height of 0.79 m above the floor. When m1 hits the ground its speed is 1.7 m/s. Assuming that the pulley is a uniform disk with a radius of 12 cm...
  34. H

    What input work is required for this machine

    Homework Statement a 25% efficient machine performs external work of 200 J. what input work is required?..please answer,,is the answer is 800 J? Homework Equations The Attempt at a Solution 800 J
  35. S

    Measuring Microwave Machine Leakage - Is There a Way?

    I have a microwave machine. I am questioning whether it has leakage or not. I am asking is there a way of measuring the leakage of microwave machine. What I have been doing was, I purchased oscilloscope, it is on the way. whenever I turned on the microwave machine, the following will be...
  36. C

    Atwood's fall machine w. sylinder (again?)

    Homework Statement Atwood’s fall machine consists of two weight of mass m1 and m2 attached with a massless rope running around a spinning wheel of mass M and radius R without slipping. The spinning wheel is attached at its center and rotates around an axis through its center without friction...
  37. M

    Optimizing Turing Machine Functions: Finding the Minimum Cost and Enumeration

    Hello smart people, I am wondering if there is a process to convert a function to a Turing Machine. In other words, if I provide a list of input strings , and a corresponding output string for each input string, is there a way to find the minimum number of instructions to realize any function...
  38. A

    Atwood machine problem (speed of mases after they have moved through 1.45 m)

    Homework Statement An Atwood machine has a mas of 2.50 Kg connected by a light string to a mass of 7.00 Kg over a pulley with a moment of inertia of 0.0652 kg m^2 and a radius of 11.3 cm. If the system is released from rest, what is the speed of the masses after they have moved 1.45 m? (Hint...
  39. L

    Energy stored and # turns in an MRI machine (solenoid)

    1. MRI (magnetic resonance imaging) is a medical technique that produces detailed "pictures" of the interior of the body. The patient is placed into a solenoid that is 40 cm in diameter and 1.0 m long. A 100 A current creates a 5.0 T magnetic field inside the solenoid. To carry such a large...
  40. I

    Should the state table include the clock and reset button as possible inputs?

    Homework Statement Homework Equations There aren't really any relevant equations. The Attempt at a Solution Ok so I just want to see if my idea for the state diagram seems ok, I'm going to give it in table form here but its the same info. F | Bk | A | B | C | D...
  41. T

    Programming Binary Addition with a Turing Machine

    hello, One can wonder what is the relation between the title of this thread and the subject of quantum mechanics, well, i was reading in a book about quantum computation and information and it was talking about computer science in some chapter where it shows a basic understanding of Turing...
  42. Ranger Mike

    Air consumption of machine tool

    Ok fellow posters.. I am trying to compare two machine tools for economy of operation. machine tool 1 uses 32 Nl/m air at idle (not moving) under power and moving uses 70 Nl/m machine tool 2 uses 73.5 Nl/m air at idle (not moving) under power and moving uses 73.5 Nl/m under power uses 70...
  43. J

    How Accurate Can an Atwood Machine Measure Gravity?

    Homework Statement Consider the Atwood's machine of Lecture 8. We wish to use this machine to measure our local acceleration of gravity with an accuracy of 5% [i.e. (Delta g)/g = 0.05]. To begin, suppose we let the mass m_1 fall through a distance L. 3.1 Find an expression for the...
  44. T

    Evaporator machine but in the operations manual

    Hello, Could someone please give me an explanation using the following equation? I work this evaporator machine but in the operations manual there is this equation below.I would like to further my knowledge. Equation for Evaporation Q = U x A x DT Q = Energy Transfer (W) U = Heat...
  45. M

    Types of commutators in DC machine

    1. Types off commutator and their effect on current densit? [b.]2I want to ask how many types of commutators are there in a DC machine and what is their effect on current density..[\b] [b]3.i have been working on it for a long time and came to know tht there are two types Brushed...
  46. D

    Atwood's machine with a cylinder

    Homework Statement a massless string of negligible thickness is wrapped around a uniform cylinder of mass m and raidus r. the string passes up over a massless pulley and is tied to a block of mass m at its other end. the system is released from rest. what are the accelerations of the block...
  47. A

    Atwoods machine, solve for mass

    Homework Statement A simple Atwood's machine uses two masses, m1 and m2. Starting from rest, the speed of the two masses is 3.0 m/s at the end of 3.0 s. At that instant, the kinetic energy of the system is 60 J and each mass has moved a distance of 4.5 m. Determine the values of m1 and...
  48. P

    Determine Mass of Pulley in Atwood's Machine

    Homework Statement The two masses(m1 = 5.0 kg and m2 = 3.0 kg) in the Atwood's machine shown below are released from rest, with m1 at a height of 0.75 m above the floor. When m1 hits the ground its speed is 1.8 m/s. Assuming that the pulley is a uniform disk with a radius of 12 cm, determine...
  49. A

    Inductance of a Rotating Machine

    Homework Statement The stator of the magnetic circuit of the above figure has a coil of turns 200, which carries a current of 1A. The rotor has a radius of 30mm, a height of 30mm and an axial depth of 20mm. The material for the stator and rotor has infinite permeability. The air gap...
  50. W

    Atwood Machine: Reduce Exp Errors By Stabilizing Masses

    Homework Statement String that is equal in length to the string connecting the pulley is sometimes tied to the bottoms of the two masses, where it hangs suspended between them. Explain why this would reduce experimental errors. Homework Equations The Attempt at a Solution I'm...
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