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

    I Restricted Boltzmann machine uniqueness

    I am dealing with restricted Boltzmann machines to model distributuins in my final degree project and some question has come to my mind. A restricted Boltzmann machine with v visible binary neurons and h hidden neurons models a distribution in the following manner: ## f_i= e^{ \sum_k b[k]...
  2. sam0916

    Engineering How to Solve for Force in Hydraulic IJ Using Statics Analysis?

    Do you guys have techniques in solving for the Force in hydraulic IJ? I've been stucked for a while now and I can't seem to find the answer.The question says the answer should be = 11, 051.9516 N (T).
  3. khodournajem

    Minimum motor power for a mechanical horizontal sieving machine

    r = 2.5 l=10 cm angle = 0 (maximum connecting rode elongation) w = 0.5 (30 rpm) n=10/2.5 = 4 so the acceleration is 1.5×0.5×0.5(1 + 1/4 ) = 0.4 m/s friction force = 10*9.81*0.3 = 29.4 Newton. Crank force is the mass of the object into acceleration. So crank force = 10 × 0.4 = 4 Newton...
  4. E

    Tensile test machine and Extensometer -- connection problems

    Dear friends i am using tensile test machine, tinius olsen 602 to conduct a tensile test for Glass-fiber composite. i am facing problem of using an extensometer from Epsilon (gage length is 25 mm). I have connected the extensometer to the tensile test machine(tinius olsen 602) through the...
  5. andrewkirk

    Troubleshooting a Frozen Far Roller on a Marcato Atlas 150 Pasta Machine

    This is a not very physics-related question, but I suppose fixing mechanical things involves a bit of physics, so I thought I might as well ask here. I have a Marcato Atlas 150 pasta machine that has stopped working. The crank won't turn because the rollers won't turn. The crank directly drives...
  6. T

    Did working as a MechE help you learn about tools in a machine shop?

    The first career that I tried to have was as a mechanical engineer. I majored in mechanical engineering at a university, but I failed out of the university. I've always been curious as to exactly what most mechanical engineers do most of the time. I imagine that the vast majority of the...
  7. E

    Feynman irreversible and reversible weightlifting machine

    i have tried to understand Feynman's words i think i finally understands what he means by "we must add a little extra to get it to run" he refers to the "inversion" of the process, that's when we need to add extra work (lifting up a little mass) please correct me if I am wrong, this is something...
  8. A

    Comp Sci Appendix C problem -- Machine Language Subtraction

    2010 210F Can only get this far without running into issues
  9. jay_chay22

    Engineering Frame and Machine (engineering mechanics statics)

    I have problem on this question on how to draw free body diagram. Can you please show me on how to draw free body diagram on this question ? The calculation part I think I do not have a problem with it. Thank you in advance ! I am really struggle with this question.
  10. TiGuru22

    Maxwell3D Error -- Unable to locate COM Engine on 'Local Machine'

    I am attempting to solve a rather simple induction problem in Maxwell3D that I have solved before. But this time when I run it I am getting this error and can not seem to find a solution in ANSYS? I am running ANSYS Suite 2020 R1 Thank you in advance if anyone has a possible.
  11. F

    Engineering Find the brake torque in separately excited machine

    Here's my attempt for part 1a: What I am not sure about is the direction, is it in the opposite direction (= - 458.37 N.m ) or it's positive? Thanks,
  12. J

    Restricted Boltzmann machine understanding

    Suppose you have an experiment of 2 possible outcomes 0 and 1 with probabilities p and 1-p respectively. I've been told in University that Restricted Boltzmann machines (RBM) can be used to infer probability distributions so I guess that one could built a RBM in order to infer p in the example...
  13. R

    Can machine learning be used to treat diseases?

    Say a person is infected with disease X. I suspect that it's possible for computers to learn the behavior of X via machine learning. This would lead to greater understanding of X. The unsupervised learning approach is pertinent to this. For another approach, say a new medicine Y is being...
  14. J

    A Restricted Boltzmann machine for Quantum state tomography

    I'm struggling with my Final Degree Project. I would like to perform a quantum simulation and perform quantum tomography for a single-qubit using a resrticted Boltzmann machine. In order to do so I'm trying to follow the recipe in the paper "Neural Network quantum state tomography, Giacomo...
  15. A

    Limiting Factors for Liner Implosion in Z Machine Fusion

    What is the limiting factor for a liner and it's implosion in a Z type machine? I wonder have they tried or is it possible to use liners that have a larger radius and contain more gas or gas under higher pressure aka more dense? Are the dimensions of the liner so small because having a larger...
  16. S

    What limits superconducting machine power density?

    Hi. There has been a fair amount of research into electric generators and motors with superconductive coils. If traditional iron cores is used that obviously limits the power density because of the iron cores magnetic saturation point. But for coreless/ironless designs i don't understand what...
  17. Caw

    Centripetal force problem involving a washing machine

    Summary:: Just want to know if I'm on the right track with this question. Hi, so this is what I have for my assignment: A washing machines drum is rotating rapidly about a vertical axis (a so-called toploader). A wet sock is stuck on the inside, halfway up the drum, and the drum begins to slow...
  18. A

    Thermal Machine: Solving for Q23 to Complete the Otto Cycle

    1-->2 (adiabatic) $$P_1V_1^γ=P_2V_2^γ$$ $$P_2=18,4.10^5Pa$$ $$T_1V_1^{1-\gamma}=T_2V_2^{1-\gamma}$$ $$T_2=429,32K$$ 2-->3 (isochoric) $$\frac{P_2}{T_2}=\frac{P_3}{T_3}$$ $$\frac{18,4.10^5}{429,32}=\frac{P_3}{T_3}$$ 3--> 4 (adiabatic) $$P_3V_3^{\gamma}=P_4V_4^{\gamma}$$...
  19. C

    A XRay Help -- Xrays are generated "accidentally" in a HV machine

    First post here, thanks in advance... It may seem like xrays aren't something to play around with at home - but that's not my intent! I just need to get some paperwork done (no, it's not homework...). Does anyone have any insight into this question - or know of an expert source I could...
  20. gregory112

    Troubleshooting a homemade Van de Graaff machine

    I'm trying to build a Van de Graaff generator, but it does not generate any charges. The problem is, I don't know which part is accidentally shorted, or grounded. I use both PVC pipes for the top and bottom rollers. The belt is neoprene rubber, 1mm thick. The rollers are bolted on aluminum...
  21. Quarinteen

    B How long before someone builds a machine to predict the future?

    Now that we have quantum computing how long before someone builds an AI ML system that can predict the future?
  22. D

    What is the free-body diagram for a massless pulley in free fall?

    Hi. First of all i have a question regarding a simple Atwood's machine. The pulley has no mass and the string has no mass and is inextensible. If one pulley is suspended from a fixed support and it has 2 masses ; one at either end of the string. If i construct a free-body diagram of the pulley...
  23. D

    Atwood machine calculation for launching a pebble

    Assume m2>m1 and take positive direction as downwards. String is inextensible so acceleration of block up = acceleration of block +pebble down =a I used the following 2 equations to obtain a ; -m1a = m1g - T , (m2+m)a = (m+m2)g - T which gives a = g(m+m2-m1)/(m+m1+m2) I then...
  24. Y

    Machine Learning - Empirical Error

    I understand everything in this equation except for the summation. I understand it's the average error over the sample. But why do we need the "1"? Moreover wouldn't the error be the absolute value of the hypothesized value minus the concept value? Meaning | h( x_i ) - c( x_i ) | because you...
  25. mingyz0403

    Engineering Machine Analysis -- gripping pliers

    I know that moment is distance vector x force vector x the degree between them. I understand it uses the moment about A to solve for the unknown force R. I don’t understand why it use Rx1.2m and why the perpendicular distance between A and R is 1.2m. could anyone please explain why? Many...
  26. F

    Clustering and Classification in Machine Learning

    Hello, I started studying machine learning and its basics. One of the applications of supervised learning ML is classification, i.e. identifying different objects and classify them. Being supervised means that the ML algorithm is initially served labelled data. The labelled data is used to a)...
  27. E

    3D model of an RBMK reactor refueling machine

    I made this 3D model of the RBMK-1000 nuclear reactor central hall about 3 years ago. But I did not model the fuel handling machine. Recently I decided to complete it by modeling the fuel handling machine.
  28. F

    Construct a circuit with single phase asynchronous machine in MATLAB

    Construct the circuit above using the block shown below. The torque was gradually increased in small steps until the load torque reached the rated torque. At each step the torque, current speed, voltage and power factor was measured and the result record in Table (1). Tn = Rated torque = 1 Nm...
  29. N

    Welding Machine Increases Power: Physically Impossible?

    How is it possible for a welding machine to end up creating more power than what it started with if that is physically impossible? For ex; 200 amp @ 28vdc welding machine. starts out with main voltage being 120v @ 20amps = 2400 watts then converts it to 200 amps at 28vdc which = 5,600 watts of...
  30. Asterast

    Question: Solving for Accelerations in an Atwood Machine System

    Summary:: I have solved the question but I'm getting answers wrong, some reaction equations seems to have trouble. Question: Let m1 = 1 kg, m2 = 2 kg and m3 = 3 kg in figure. Find the accelerations of m1, m2 and m3. The string from the upper pulley to m1 is 20 cm when the system is released...
  31. MotoMike

    Study of an unbalanced washing machine

    the washer is a front loading type with axle of the drum going from the center of the front door to the back of the washer. the axle is close to horizontal. the pedestal is made for the washers and has a drawer in the bottom. the washer is firmly attached to the pedestal, essentially bolted...
  32. D

    Electrical Trying to build a diy EMG machine

    i placed a emg pad on my elbow and 2nd emg pad on the part of my forearm near the elbow and a 3rd emg pad on the part of my forearm near the hand. i connected the 2nd emg pad to a wire, which was connected to the red prong and 3rd emg pad to a 2nd wire which was connect to the red prong. so both...
  33. scottdave

    Make sure your slot machine has a good pseudorandom number gen

    In this NPR podcast (Planet Money) they describe how the cheaters figured out the pseudorandom number generators in a certain model of slot machine. I found it interesting and entertaining.
  34. A

    Misc. Paper folding manual machine - plan folding

    Hello everyone! I am trying to replicate a folding machine, just as a fun project for home use. I understand this simple idea of a folding machine, and I know which measurements I should take. The question behind this project that I simply can´t understand is the spring linear clamp which...
  35. E

    Small error in calculating the value of g with an Atwood machine

    Hello, I hope you are very well ! I have a physics practical test where I have to find the gravitational acceleration with the Atwood machine: I've found 9.27 m/s² and have to say what could have caused this slight gap. They say that there is no friction in this experiment. I can't really...
  36. christang_1023

    Engineering Verilog for a Simple Vending Machine

    module fsm(input clk, rst, fifty, onedollar, output insert, dispense, reject); reg [1:0] st; wire [1:0] nst; parameter ready = 2'b00, s1 = 2'b01, dispense = 2'b10, reject = 2'b11; always@(posedge clk) begin if ~rst st=ready; else st=nst; end assign...
  37. P

    Why is tension (T) only added to one side of an Atwood Machine?

    I solved for a1 prior to the force (f) being added. -a1 = a2 and T = m1*a1 + m1*g T = m2*a2 + m2*g <--substitute -a1 = a2, multiply everything by -1, add the two equations in order to solve for a1 (and thus also a2) T = m1*a1 + m1*g -T = m2*a1 - m2*g 0 = m1*a1 + m1*g + m2*a1 - m2*g...
  38. Negatratoron

    Discussion Thread on the "Massless Charge" Perpetual Motion Machine

    Imagine a massless (or very light-weight) charge that is glued to a rod undergoing sinusoidal motion along an axis. The acceleration of this charge produces electromagnetic waves, which can be harvested for energy, and this energy can be used to power the continued sinusoidal motion as well as...
  39. J

    400 volt 3 phase 16 amp machine -- can it be used in the US?

    Maybe you can please give advice. I have a coffee roaster here in New Zealand I would like to bring to the US. It is 400 volt 3 phase 16 amp. It has a blower, a heater and computer components to run it. It is like a very large popcorn machine. Can this work in the US?
  40. R

    Comp Sci Finite state machine that doesn't terminate and detects overlapping strings

    Attached is what I have so far. I believe it is done but I am not 100% sure. It seems to me like every case is considered. For each state, and output of a,b, or c is possible.
  41. M

    MHB Is this a Gödel number of a Turing machine?

    Hey! :o We have the number \begin{align*}70&6737922567786324304462189150536772513339293263220644 \\ &=2^2\cdot 3\cdot 59^5\cdot 103\cdot 149^2\cdot 353\cdot 607\cdot 823^4\cdot 1409\cdot 1873^2\cdot 4201^3\end{align*} I want to check if this is a Gödel number of a Turing machine. From...
  42. M

    MHB Reducing States in Modified Turing Machines

    Hey! :o I am looking at the following: The Turing table of the following modified Turing machine is given: Change this into an ordinary "Turing machine" (i.e., one that either writes or moves the head). Give the appropriate Turing table. Give also the Turing table of an equivalent...
  43. markzboyce

    Can someone compute the electrical output of this machine in watts

    Setting aside whether this works or not, can someone here compute the output in watts-?
  44. markzboyce

    Can this machine produce more work than consumed?

    [Mentors’ note: Elaborate explanation of unworkable perpetual motion machine removed]
  45. H

    Misc. Project: Single Shaft Shredder

    Summary: Single shaft copper shredder I design a rotor of a shredder, but i need to find a motor for the rotor of the shredder. My questions are: 1. What is the best rpm for a copper shredder ( what kind of effects wil the shredder have on high rpm 1200-3000, lower rpm 300-1200 ) 2. what...
  46. S

    Dual heads on a 3-axis machine, without interfering?

    As the description says, I want to make something which moves 2 heads on a 3-axis basis. The heads will ideally rise from the flat top of whatever contraption will be needed - it's not an option to have one rise from the bottom and the other descend from above. Aside from the obvious collision...
  47. E

    Beach Cleaner Machine Research in Ontario, Canada

    So I am trying to design a beach cleaner machine in Ontario for my project... As part of it I have to research codes and regulations needed to implement it. I can't seem to find any regulations in Canada regarding beach cleaners, are there any?
  48. Z

    Comp Sci Understanding Residue 3 Automata: A Guide to Moore Machines | Zulfi

    Hi, I am trying to create residue 3 automata using Moore. I can't understand why we go to state q1 when we have input 0 in q0 and similalry why we go to q2 when we have input zero in q1. I have attached an image of FA. Some body please guide me. Zulfi.
  49. ValeForce46

    Two objects exchange heat through a cyclical thermal machine

    This is how I solved part a) : ##Q_1=C\cdot (T_1-T_i)## This quantity is negative because object 1 loses heat. (positive for the machine) ##Q_2=C\cdot (T_2-T_i)## This one is positive because the object 2 absorbs heat.(negative for the machine) Then the exchanged heat FOR THE MACHINE is...
  50. dilby

    Principles behind a ball pitching machine

    Hi all - I'm not an engineer or even very good at physics, but I was hoping to learn about something I'm interested in. I bought a ball pitching machine that I've outgrown and I'm wondering about either modifying it or even building my own and wanted to know about some of the key principles...
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