What is Dynamic: Definition and 477 Discussions

Dynamic is an Italian independent record label located in Genoa. Founded in 1978, it specialises in classical music and opera, especially rarely performed works and has produced several world premiere recordings. The Dynamic catalogue contains over 400 titles, with about 25 new titles added each year and is distributed in 32 countries.

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  1. V

    Modelling a dynamic system of permutations

    Let us assume a dynamic system which has vector with 'n' components (which are non-negative integers from 1->n) at time t=1. In other words we have a permutation over 1->n at time t=1. Assuming time to be discrete, at any time time 't' , the system evolves such that there are 't' permutations...
  2. O

    Static Motor Speed Under Dynamic Load

    Hi. For a project of mine, I need a motor that can dole out and pull in a wire at a constant speed under a dynamic load. The load will be anywhere between 20-500 lbs. The speed will be about 1 ft/sec. Any idea about how I can achieve this effect? Is a motor even the right way to go or should...
  3. L

    Dynamic Similarity / Reynolds Number

    Question from Text Gas (rho = 5.25 kg/m^3, v = 2.0 x 10^-5 m^2/s) is flowing in a 20-mm-diameter pipe. When a gas flowmeter measures the flow as being 0.064 kg/s, it registers a pressure drop of 8.5 kPa. Investigators plan to test an enlarged model that is geometrically similar in a...
  4. X

    Solution to Navier-Stokes Equation for dynamic boundary

    I'm looking to get a full solution to the Navier-Stokes equation to describe fluid flow through a pipe with moving surfaces. For now I am just concerned with a two dimensional system. The upper and lower boundaries are parallel to the x-axis. The surfaces of the boundaries move sinusoidally...
  5. R

    How Do You Solve a Dynamic Pulley System Problem?

    Homework Statement http://img53.imageshack.us/img53/6141/41622697.png Homework Equations F = ma, all that basic stuff.The Attempt at a Solution Alright g = 32.2 Ma = 150/g = 4.66lb Mb = 75/g = 2.33lb so Box A __ |...}==== 2T |__| box B 3T -----|...|______ 60lb ===={__| Sum of Fx = ma so...
  6. P

    How Do You Calculate the Angle and Tension in a Rotating Ball System?

    Homework Statement 2 kg ball revolves in a horizontal circle with speed of 1.5 m/s. knowing that L= 600 mm, determine (a) the angle that cord forms withe vertical (b) the tension in the cord i don't know how to put the figure but this problem is similarly like people...
  7. C

    Full well capacity and dynamic range of CCD

    Hi, I have some question about the full well capacity and dynamic range of the CCD camera. The following link lists some full well capacity and dynamic ragnes of some CCD cameras: http://www.andor.com/learning/digital_cameras/?docid=321 My question is how they obtain the electron numbers...
  8. D

    Discrepancy in the solution of a nonlinear dynamic system

    Hi, I am solving the following nonlinear dynamical system using Energy Balance Method (EBM*). My intention is to arrive at an approximate analytical expression for the frequency of oscillation and the excitation force. u''+u=A(1+2*u) with u(0)=u'(0)=0, where A is a constant (Physically it...
  9. P

    Dynamic Case Study: Exploring Kinetics of Forces & Acceleration

    Homework Statement i need an idea from all forummers.i have to do dynamic case study which is focus on kinetics that study of the relationship between forces and the acceleration they cause and it's based on Newton's 2nd law of motion.it can be problems that occur in real life which caused by...
  10. J

    Geogebra is a free and multi-platform dynamic mathematics software

    Geogebra is a free and multi-platform dynamic mathematics software for learning and teaching. Looks pretty good to me if you can't afford an advanced software program like Mathematica or Matlab.
  11. A

    Help required to understand dynamic pressures

    Hi all, I am trying to understand the concept of dynamic and static pressures and would appreciate your help. I've got a nozzle flow setup, such that the flow is exhausting into atmosphere. Am I right in assuming that the dynamic pressure at exit (relative to atmosphere) is equivalent to...
  12. M

    PHP How Can I Replace My Static Website with a Dynamic Website Using PHP & MySQL?

    Hi, I already have a static website, and now I am trying to design a dynamic website. I used Apache, PHP, and MySQL and setup on my computer (hostname = localhost) and tested my member directory database. It worked fine that I can add, edit and delete, and update the data from table. I...
  13. G

    Creating Large Dynamic O-Ring Seals: Is It Possible?

    Is it a huge daunting engineering task to create a very large dynamic o ring water seal (sliding up and down a shaft with ring on a mating surface) say about 50 or 100 meters in diamter? Would it be a good idea to make the ring and moving part a cube like shape so as to have a square seal...
  14. rcgldr

    Dynamic Soaring: Reaching 392mph with Radio Control Gliders

    Dynamic Soaring takes advantage of differeing wind flows separated by a thin wind shear boundary. Recently the record for radio control glider reached 392 mph (peak speed is over 400mph, but the convention is to measure the uphill return speed: http://www.youtube.com/watch?v=WaQB16ZaNI4&fmt=18
  15. C

    Use of state space equations to model a dynamic system

    Hello, I enclose a jpeg of the circuit and two simulink jpeg files. The first mdl file - First Test circuit sucessfully models the circuit. The second one where I attempt to model the circuit from its state space equation does not. Can anyone help me to create a correct state space model...
  16. B

    Qusetion about dynamic emitter resistance

    I have a question about the nodal equations of BJTs - when analyzing a circuit to find out the input impedance, output impedance etc. is the term representing the intrinsic emitter resistance, Rbe (that is approximately 26mv/Ic) multiplied by the term beta+1? I'm looking at two references, and...
  17. A

    Calculating Car Acceleration on a 3% Slope at 88.5 km/h

    A car is rising an excerpt in slope of 2%, at a constant speed of 88,5 km/h. If the driver does not change the motion, or changing the pressure of your foot on the accelerator, which should be the acceleration of the car down the stretch of 3%?Answer 0,491 m/s^2
  18. A

    How Do You Implement Dynamic Meshing in OpenFOAM?

    Homework Statement does any1 know how to make dynamic mesh on open foam? Homework Equations The Attempt at a Solution i can't find any yet.. thx
  19. W

    Dynamic Impossibility of Photon to Electron/Positron Conversion

    Show that the following process is dynamically impossible: A single photon in empty space is transformed into an electron and a positron. Hint: use conservation of momentum and energy for this problem I know a photon has no rest mass and therefore its energy is just equal to pc. However...
  20. T

    Dynamic meshing 2 stroke engine issue

    Hello everyone, im a 5th year student and I am doing my final project which consists on analyzing the scavenging process of a 2 stroke opposed piston engine, but I am having a hard time creating the UDF for the dynamic meshing thing. Could anyone please help me?
  21. J

    Is My Calculated Acceleration Correct? Help Needed!

    Hey guys, I am rather stuck with my work from College, I missed a bit of College as I was having treatment for Cancer, and so I missed a lot of work :frown:, but I'm desperately trying to catch up! If anyone could help me with my work, I would really appreciate it, thank you guys/gals!
  22. tiny-tim

    What is the Correct Definition of Dynamic Resistance and Resistivity?

    I'm confused about dynamic resistance. The definition I've seen is Rd = dV/dI. Is it also ok to write it Rd = d(IR)/dI, so that Rd = R + I dR/dI ? I couldn't find a straightforward definition for dynamic resistivity at all … is it ρd = d(Iρ)dI = ρ + I dρ/dI ?
  23. S

    Help With Dynamic Force Calibration

    I am currently working on a project which involves me using a force sensor. So far I have tested the sensor statically. However, I need to calibrate it dynamically so that the output voltage can be used to determine a force in Newtons. I have done a bit of research so far and it seems that it...
  24. A

    Maximum Acceleration for Flatbed Truck with Jet-Powered Crate

    Homework Statement A jet-powered flatbed truck has a crate of mass m, which is strapped down to the truck with a tension three times the weight of the box. Find the maximum acceleration without having the box slide. Us= .9, Uk=.7 Homework Equations Fun= SUM Fun= ma Ff= -(Us) Fn...
  25. T

    Applied ME: Drag Force Calculation with Load Cells & LabVIEW

    Hello, First time post long time lurker! I've got an interesting project I am working on which involves a few MechE subjects. The overall goal (for now) is to determine the drag force of a cylindrical cone headed object in sand under various pressures. The movement of the cylinder is the tricky...
  26. A

    Algorithms For Change In Dynamic Discrete Systems

    I've been noticing that several new technologies (SSDs, integrated batteries, etc.) are using wear-leveling algorithms but I've never actually seen one; is there a model or set of nicely arranged equations out there? I'm trying to find a general method that can be applied to a wide range of...
  27. T

    Calculating Wheel Loads in Dynamic and Static Conditions for Vehicle Analysis

    Hey Just needed some help with analysis of vehicle loading in dynamic and static conditions.Basically what are the axial and radial loads acting on the axle/wheel in static and dynamic conditions? Accompanying formula would be helpful. How would i go about finding out the loads under static...
  28. P

    Dynamic Mesh - Fluent - Savonius Wind turbine

    Hey guys, new user here. I had a question about a project I am working on with a professor. Unfortunately he does not have much experience with fluent but is a very intelligent and experienced person when it comes to the theory. So I am basically trying to develop a chart of the power...
  29. L

    Kinetic and dynamic twin effect

    I just realized that the standard "twin paradox" in SR is actually a purely kinetic effect. It is solve by the obvious assymetry of the twins and the time dilation. However, the acceleration is not really needed in solving the paradox, since a third person could carry the clock backward...
  30. C

    Tesla's Dynamic Theory of Gravity: Unpublished and Unexplored

    I was wondering if anyone could tell me about Tesla's Dynamic Theory of Gravity, I couldn't find much on it (I read that it wasn't ever published, which could explain why I haven't found anything). I did read that his theory was explaining gravity by using electromagnetism, which is fascinating...
  31. K

    Semiconductor Optical Amplifier Static and Dynamic Design

    Hie. I would like to know anyone who knows or have idea on design static and dynamic model for Semiconductor Optical Amplifier? Currently my lecturer ask me to design using Optisystem software which I quit blur on designing this models. Anyone who knows and help me please. Thanks in advanced..
  32. T

    Dynamic cylinder + pulley question

    Homework Statement http://members.shaw.ca/code/cylinder.JPG Homework Equations I denote the top of the ceiling to the top of cylinder A la. I denote the top most small pulley above A to the larger pulley bottom directly above A as Xa I denote the distance from the pulley that changes...
  33. K

    Dynamic Systems: Calculating Boom Crane's Transfer Motion

    There is boom crane with a bucket attached at the end. The angle of the boom "theta" is 60 degree. The weight of the bucket with a man in it is 200Kg. The mass of the boom is acting at centre of the boom (length of the boom is 10m) is 600 Kg. There is a cylinder attached to lift the boom 1m...
  34. W

    Block on Block Dynamic Question

    I was wondering if anyone knows the answer to this question: Homework Statement consider 2 blocks of masses m1 and m2. the block of mass m1 is resting on top of the block m2 which in turn is resting upon a horizontal surface. The coefficient of static friction between the 2 blocks is u1...
  35. K

    HELP A dynamic question with friction

    HELP!A dynamic question with friction Homework Statement Two blocks lie on a table as shown and are connected by an inextensible cord around a frictionless, massless pulley. A force F=50N is applied to the pulley. The coefficients of friction between the blocks and the table are mu(s)=0.20...
  36. JJBladester

    Dynamic Equilibrium Question (block sliding on wall)

    Homework Statement http://i450.photobucket.com/albums/qq230/JJBladester/06_p51.jpg?t=1223753179 The 2.0kg wood box in the figure slides down a vertical wood wall while you push on it at a 45 degree angle. What magnitude of force should you apply to cause the box to slide down at a constant...
  37. S

    Design Dynamic Reciprocating Pump Engine with Variable Stroke Length

    Hey guys, I'm trying to design a reciprocating pump engine with a dynamic stroke length. basically something like this: http://www.animatedsoftware.com/pics/pumps/animpist.gif" However I wish the stroke length to be variable and dynamic. The only way I have found so far is the change...
  38. Y

    Dynamic equilibrium - walking in constant speed

    Homework Statement A man is walking in a straight line in a constant speed V. All variables are known. Since the speed in constant, the net force is zero. But aside from the static friction which is allowing him to move forward, what other force is present (in the direction of the movement)...
  39. B

    Dynamic Suspension Emergency

    Hi all, (see the attached images) working on a dynamics project about the suspension system in a bike, we have been given a 4 bar linkage - dynamic system, and I am trying to find the velocity of POINT C and POINT F, but given in terms of the angular velocity of bar AB in the STATIC...
  40. S

    Dynamic equilibrium (I though I understood now went blank again)

    Hello everyone, It is funny that I thought I understood dynamic equilibrium really well but now I have gone blank again. I can do all the calculations and I understand Le chatelier principle well. Here are the problems I have. 2A+B <----> C * If forward reaction equals backward...
  41. S

    Permeability with static and dynamic H fields

    If a material has a higher permeability (electromagnetism) than another when in the presence of a fixed H field, would it generally also have a higher permeability when in the presence of a changing H field?
  42. E

    Ebook about the dynamic analysis of a bar mechanism?

    Do you know an ebook about the dynamic analysis of a bar mechanism?Thank you.
  43. T

    Dynamic Balancing: Help Needed for 3 Large Machines

    looking for help- built 3 large dynamic balance checking machines- built one years ago for small parts, worked fine- new machine tooling weighs over 100 pounds and has some inherent imbalance...so requires tooling compensation- plus new workpiece has substantial axial offset from...
  44. Astronuc

    Dynamic Outer Planets Expedition Planned

    Heads up! Really cool! :cool: I hope they do both the aircraft and submarine on Titan and Europa. Talk about a design challenge.
  45. E

    Dynamic head, pressure drop formulas?

    My fluid dynamics is rather weak and i was wondering if someone could please tell me how to calculate dynamic head of the flow in the a tube and how to calculate pressure drop of a hole in a tube? Some formulas would be handy thanks engineering
  46. Y

    Static vs Dynamic: Finding Force of Tension

    What is the difference between figuring out the force of tension in the string using the static and the dynamic method?? We did a lab where a toy pig was hung from the ceiling with a string and when we turned the pig on the wings moved and traveled in a circle... In the dynamic case, we just...
  47. D

    Shortest path on dynamic graph

    Shortest path on dynamic "graph" Suppose you have n objects orbiting Earth with velocities v1, ..., vn. Starting from t=0, the objects are at positions x1,..., xn; how do you calculate at what point they will be at a state such that the shortest path (arcs of great cirlces) connecting all of...
  48. Phrak

    Dynamic Braking of 3-Phase DC Motor

    To brake a 3ph DC, the best I've come up with, apparently, is to place a pair of power FETS, back-to-back across each pair of leads. I would like to manage a hard short without additional load beyond the motor winding resistance, then duty cycle to get controlled braking. As far as having...
  49. E

    Calculate Dynamic Viscosity of Air at 4000m Altitude

    How to calculate the dynamic viscosity of air at high alttitudes,i want to calculate it at hight 4000m abovesea level at that hight the temp. is 262 kelven degrees. Any thoughts?
  50. C

    Dynamic Confinement: Min Angular Velocity of Object for Solid Behaviour

    What is the minumum angular velocity of an object to behave solid to various objects? I've tasked myself with determining the rotational velocity (omega) for (n) vertical beams rotating a distance (r) from common axis such that particles moving at a linear velocity (v) with a radius of (p)...
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