What is Transient: Definition and 200 Discussions

ECHELON, originally a secret government code name, is a surveillance program (signals intelligence/SIGINT collection and analysis network) operated by the United States with the aid of four other signatory states to the UKUSA Security Agreement: Australia, Canada, New Zealand, and the United Kingdom, also known as the Five Eyes.Created in the late 1960s to monitor the military and diplomatic communications of the Soviet Union and its Eastern Bloc allies during the Cold War, the ECHELON project became formally established in 1971.By the end of the 20th century, the system referred to as "ECHELON" had evolved beyond its military and diplomatic origins into "a global system for the interception of private and commercial communications" (mass surveillance and industrial espionage).

View More On Wikipedia.org
Recent contents Top users
  1. ltkach2015

    Homogenous Solution Represents the Transient Response Right?

    CONCEPTUAL QUESTIONS: -Does the Homogenous Solution represent the Transient Response? Let me specify. For a N-DOF spring, mass, and damper mechanical system: -Does the Homogenous Solution represent the Transient Response for given mechanical system? MY ANSWER: Yes. ASSUMPTIONS: -only...
  2. K

    How does negative feedback affect op-amp response?

    Hello, I have two questions about feedback. 1. If we look at the equation above, it says G(Vin-BVout)=Vout but this equation is actually,G(Vin-BVout1)=Vout2 whereas Vout1 is Vout for first iteration and Vout2 is Vout for 2nd iteration. Therefore, they must have different values. How can we...
  3. R

    How to design coil terminals for maxwell3D transient?

    In magnetostatic simulation model I design the winding as a volume of copper and assign a single plane on the volume of copper as current excitation terminal to define the winding current value and its direction. In transient model when I am creating coil terminal for a winding, I need to...
  4. DoobleD

    E field inside wires during transient state

    I've come across an instructive paper which explains qualitatively what happens inside wires of a simple circuit during the transient state, leading to the steady state where there is an uniform E field everywhere inside the wires. Here are two figures from the paper which are pretty much self...
  5. C

    First order transient circuit

    Homework Statement It asks me to find io(t=0-), io(t=0+), and Vc(t=0-). C=100μF R= 2kΩ Homework Equations V=I*R, i(t)= i(∞)+[i(0+)-i(∞)]*e-t/τ, Vc(0-)=Vc(0+) The Attempt at a Solution [/B]I first tried to calculate Vc(0-) as it will be the same as Vc(0+), stating that at t=0- the...
  6. I

    Transmission line transient simulation

    Dear all, I am simulation a lossy transmission line like this: http://www.ece.uci.edu/docs/hspice/hspice_2001_2-2878.jpg with G having zero conductance (open). So it is a standard lossy transmission line with RLC components. All R, L, and C values are the same, so there is no variation from...
  7. J

    Solving a Series RLC Transient Analysis Problem

    Let's say we have a free-source series RLC circuit. The differential equation that describes the behavior of the transient is given by Ri+L\frac{di}{dt}+V=0, where V is the potential difference across the capacitor. But I have trouble understanding the way this equation is developed. For...
  8. M

    Transient Impacts, Summation of Forces and Transfer Fuctions

    So I have a question I am hoping someone can help me answer. I am trying to compute transfer functions for a hammer impact with an accelerometer response on a cylinder. Please see the attached photo. http://imgur.com/F8DGwl2For some reason the picture did not attach but I have uploaded to...
  9. T

    Synchronous Machine Transent parameters from sudden 3phase Short Circuit

    Hi, So we're doing this Lab on Transient reactance of a synch generator and I'm reading Sarma's classic: Electric Machines Steady-state theory and Dynamic performance p. 474-479 But I can't see how to get the actual exponential time constants for the sub-transient and transient reactances? Thanks
  10. E

    [Multisim] Transient time point calculation did not converge

    Hi. I have problem simulating this circuit in Multisim: (LTSpice) Here is scheme from Multisim: When I run transient analysis, I got this: ------ Checking SPICE netlist for Design3 - Saturday, September 26, 2015, 10:58:03 AM ------ ======= SPICE Netlist check completed, 0 error(s), 0...
  11. V

    Ansoft Maxwell - Multi terminal excitation on 3D Transient

    Hello everybody,I am busy with a magnetic transient 3D model and quite new in the use of Maxwell. I am simulating a 6 pulse rectifier in double star connection (connection number 5 as per IEC 146-1-1). Each of the 6 arms of rectifier foresee 8 paralleled diodes. I am interested to see the...
  12. Kolton

    Solving Magnetic Field Problems w/ Ansoft Maxwell 14.0?

    So I'm trying to run some 3D transient simulations based on magnetic field focusing/shielding, but I'm not getting the expected results. Does anyone know if Ansoft Maxwell 14.0 will solve for the magnetic fields created due to the eddy currents? It doesn't appear to.
  13. R

    Transient FEM Simulation of a Solenoid Actuator with MAXWELL

    Hey Guys! Hi Guys! Well I am new here and I have to confess that I somehow got stuck in a 3D transient electromagnetic simulation of a solenoid actuator and… I’m a mechanical engineer^^ So I would appreciate some help of you guys! 1. I imported the geometry from CAD-files. But I remodeled...
  14. J

    Ansoft Maxwell - Transient solver

    Hello everybody i am trying to simulate some high air gap transformer. While Magnetostatic solution works fine , transient seems not to. Actually i connect the first winding to a 90KHz voltage source and then in series with a capacitor. The second winding in series with a Capacitor and a...
  15. MexChemE

    Transient state energy balance -- Variable volume system

    Hello PF! I have some questions regarding the accumulation term for the energy balance on a variable volume system. Suppose we have a tank storing a liquid substance. The tank has a moving boundary at the top, which can expand unlimitedly. The system has a mass input \dot{m}_1 and mass output...
  16. cnh1995

    Switching transient in current transformer

    If a purely inductive circuit is excited with an AC source, a transient occurs before reaching the steady state 90 ophase shift i.e. the current takes some time to shift the phase depending on the switching instant. Is there any such transient in CT?? Suppose the primary circuit is initially off...
  17. mudweez0009

    Transient heat conduction of a semi-infinite solid

    Homework Statement This is a problem regarding transient heat conduction in an undefined semi-infinite solid, initially at a temperature T0 whose surface temperature is suddenly raised to a new constant level at Ts. I also supplied the problem as an attachment for ease in explaining the...
  18. A

    Parallel RC transient response

    Homework Statement An accelerometer is connected via a length of coaxial cable to an amplifier. The arrangement is modeled by: (a) a Norton generator in parallel with a capacitor (CP) representing the piezoelectric crystal within the accelerometer; (b) a lumped capacitor (CC) representing...
  19. M

    How can I successfully simulate a Transient 3D solver using ANSOFT MAXWELL?

    Hi All, I'm starting using ANSOFT MAXWELL and stuck in simulating a Transient 3D solver i'm simulating a simple permanent magnet setup (attached an image) to examine fields/forces/motion M1 is rotating around Z-Axis while M2 is fixed out of the motion setup I'm seeking some guidance to get...
  20. STEMucator

    Engineering Transient Circuit 2 HW: Find i_L & v_L

    Homework Statement I felt some more practice for this was needed and I want to make sure I really understand. The circuit is given: I'm asked to find the current in the inductor just before the switch is closed ##( i_L(t = 0^-) )##. Then I'm asked to find ##v_L## at the instant just after...
  21. STEMucator

    Engineering Solving Transient Circuit Equations for v_C(t)

    Homework Statement I had a question about transient circuits. I was asked to find an expression for ##v_C(t)## at any time ##t## for the following circuit. My work is shown in the image below. Then the response is interrupted at ##t = 50 ms## by the switch being opened and I'm asked to derive...
  22. ranju

    Solving Transient Response Homework Statement

    Homework Statement In given network (voltage source V & switch K) , a steady state is reached with the switch k open .At time t=0 , switch k is closed. Find voltage across C before switch is closed? and i1 &i2 at t=0+.Also values of di1/dt and di2/dt at t=0.Homework EquationsThe Attempt at a...
  23. S

    Transient Stability in industrial network

    Hi All I have done transient stability simulations on isolated electrical network using ETAP 7.5 software. Problem: On buses Faults generators return to stable stade But on cable faults, rotor angle is diverged so the system is not stable. To be noted that we have 2 SOLAR generators of 5MW...
  24. ranju

    Solving Transient Analysis Homework Problem

    Homework Statement In the given circuit (voltage source is V) , we have to find initial and final values of current and also di(0+)/dt , di2)0+)/dt , d2i1(0+)/dt2 . Now , by intial and values of currents , does they mean i(0-) and i(0+) or the discharging or charging current?? nd how to form...
  25. C

    Sketch waveform to represent the transient response

    Homework Statement Sketch, on a set of common axes, waveforms to represent the transient response of circuits having transfer functions with the following parameters: a) ζ = 0.5, ω = 1×10^3 rad s^-1 b) ζ = 0.2, ω = 2×10^3 rad s^-1 c) ζ = 2, ω = 1×10^3 rad s^-1 Homework...
  26. B

    Thermal transient Simulation

    Hello, I have modell in Ansoft Maxwell sumulate and need to transfer (import) it in Workbench ANSYS for the next step (Thermal analysis). How can i import it? Thank.
  27. M

    Transient currents and effects

    Hello, My question is out of curiosity and pertains to transient currents and their possible effects on any electrical equipment. For example, The various electrical components(infotainment systems, headlights, radio etc) in a car are “grounded” on the chassis, If a live wire from a electricity...
  28. F

    Two methods for solving Transient Circuits

    Hi! I'm learning about solving transient circuits using the differential method and step-by-step approach and I'm just wondering if there's any advantages or disadvantages to both. Are there any problems which will be easier solved using the step-by-step approach vs differential? Thanks!
  29. R

    Engineering First-Order Transient Circuits

    Homework Statement Use the step-by-step method to find vo(t) for t > 0 in the circuit in the figure below. Homework Equations V=IR, KVL, Mesh Analysis, Voltage Division, Solution form of first order equations The Attempt at a Solution Finding the current through the inductor before the...
  30. N

    Assembling mass matrix for transient heat conduction pde

    I have derived the weak form of the transient heat conduction equation (for FEM) and I am having trouble trying to assemble the mass matrix This is the PDE: \frac{\partial U}{\partial t} = \alpha \nabla^2U This is the equation for the mass matrix for an element: M^e = \int \Psi...
  31. U

    Biot number-does it tell us if a problem is transient or steady state?

    So in a lumped parameter system, we use the ln(Θ)=exp(-hAt/ρVc), where Θ is non-dimensional temperature. This expression has 't' i.e. time in it. So does this mean it is used only for transient problems? Also, does the Biot number Bi tell us anything about whether a problem is in...
  32. S

    How to model transient conditions?

    Hello, I am graduate student in NE within the US. I am working on a grant that examines a small (10-100 microns) ceramic film region on the outside of the cladding region. I have assessed the neutronic impact, as well as a thermal impact (heat transfer coefficients, etc.) of the additional...
  33. C

    Engineering Transient response of RL Circuit

    Homework Statement Find the expression of the current "i" by terms of time. The answer is 3e^(20t) Amps Homework Equations i(t)=I_final+(I_initial-I_final)*e^(-t/τ) The Attempt at a Solution I have found the initial current as 3 amps. However, after the switch had been changed for too long...
  34. B

    How Does Current Behave in a Discharging RC Circuit?

    Homework Statement Determine the current flowing when the capacitor has been discharging for 5μs Capacitance=400 pico farads which is charged to 10v through a 50kΩ resistor. Homework Equations Vc = ve-t/CR The Attempt at a Solution So Vc =Ve -t/CR -t/CR =...
  35. J

    Engineering Transient Analysis of an RLC Circuit

    Homework Statement For a series circuit with the following components: 1. Vin(t) 2. 1K resistor 3. 100 mH Inductor 4. 1 uF capacitor 1. Write down the differential eqn. for Vc in the circuit. 2. Solve the DE, calculate the natural and forced response with the following initial...
  36. K

    Hydraulic turbine transient performance

    Hi I am having difficulty explaining to my mechanical engineering supervisors the following: When a pumped storage unit is in generation mode, synchronised to the grid and in steady state and the guide vanes/wicket gates are opened more to allow more water flow and therefore more power...
  37. A

    Laplace transforms for the transient analysis of networks

    Homework Statement Use Laplace transforms to derive an expression for the current flowing in the circuit shown in the figure, given that i = 0 when t=0 Homework Equations Expression for the current in an LR series circuit I(t) = V / R (1-e-Rt/L) V - Volts (6V) R - Ohms (10Ω) L...
  38. A

    Laplace transforms for transient analysis

    Homework Statement A capacitor of 0.1 F and a resistor of 5 Ω are connected in series; the combination is applied to a step voltage of 20V. Determine the expression for the: (a) current that flows in the circuit and (b) the voltage across the capacitor in time domain. Homework Equations...
  39. A

    Physics Lab, Transient response of LCR circuit, lorentzian curve

    I wasn't exactly paying much attention during our lab, partially because it was right in the middle of midterms and I wanted to solely focus on those. Now it is coming back to bite me as I am not entirely sure how to complete my lab report, or the theory behind the lab really. If you would like...
  40. LADransfield

    DC Transient RL Circuit - Current Decay

    If I have a circuit with R = 1Ω L = 300μH V = 20V i0 = 5A I know that I can use the equation at the bottom of page 13 to calculate the current rise given any starting current and input voltage: i(t) = (V/R)[1-e-t/τ] + i0e-t/τ This is fine, and stops increasing at 20A as expected...
  41. P

    Engineering Transient Response RC series circuit

    Hi, I have been given a question which involves analysis of a series RC circuit. The system in question has a 4Ω resistor in series with a 1000μF Capacitor (the capacitor is to be considered as completely uncharged before t=0). There is a 12V supply in the circuit. At t=0, a switch is...
  42. V

    Solving Transient Response RL Circuit with Switch

    Homework Statement I have a circuit containing an inductor, 2 resistors and diode in series however there is also a switch. The Attempt at a Solution I thought that when the switch is closed there would be no current flowing through the right side of the circuit (resistor and...
  43. P

    Transient Response: Analyzing Current with Thevenin's & Mesh/Nodal Analysis

    Homework Statement =137200878&filters[recent]=1&sort=1&o=0"]http://s741.photobucket.com/user/pforpashya/media/studybitch/untitled_zps4cac3f38.png.html?filters[user]=137200878&filters[recent]=1&sort=1&o=0 Homework Equations The Attempt at a Solution Well I already got the solution and also...
  44. J

    Transient 1D radial conduction

    Morning all, This is probably going to seem absurdly simple, however I need to do a very quick conduction calculation as part of a much larger problem I am working on. I was wondering if anyone would be able to give me some pointers as time is of the essence. The scenario can be simplified as...
  45. D

    Transient - Contact Analysis in Ansys

    Hi all! I am trying to solve a transient contact analysis in Ansys 14.0 The problem is a Bouncing Rectangle problem. That's the procedure I use: /Prep7 k,1,-30,0,0 k,2,30,0,0 k,3,-30,30,0 k,4,0,30,0 Create->Areas->Arbitrary->Through Keypoints !Create the ground k,50,-20,30,0...
  46. astroscout

    Questions about a Transient Luminous Event

    I was watching TV and noticed a lot of flashing lights outside which was coming from a distant storm. I got my camera and proceded to take pictures. During one of the 8 second exposures I saw a large bolt rise from the top of the storm cell then it quickly collapsed but then it rose again but...
  47. P

    Definition of transient absorbtion

    Hi, could someone help me to define what is transient or in other words short-lived absorbtion? Maybe the general defintion could sound something like: In transient absorbtion the sample is excited with some kind of source(electrons, laser ,x-ray and so on) and then flashed with wide spectra...
  48. A

    Need help on finding a program that can output transient curves as txt

    Hello! I'm currently working on a solenoid and trying to simulate the response of a ferrous rod in the coil. I've been using FEMM 4.2 for my magnetostatic simulations, and Pspice Schematics 9.1 for the circuit part. I was thinking of combining the two by using scripts to let FEMM run through...
  49. T

    Engineering Voltage Drops in Transient RL Circuits

    Hi all, I have a general query about voltage drops. Below is an example of the sort of question i am dealing with. If we have: a series circuit with a 14v dc supply, with a resistor of 200ohms and an inductor with inductance 0.6H use the exponential equation to work out voltage across the...
  50. G

    Transient oscillations in transformer?

    Hello, I calculated the transient response of a weakly coupled transformer (M ≠ L1L2), for a heaviside step function input. I get a decaying oscillatory response, even though I didn't include any capacitance, can this be? If interested here is the angular frequency I get...
Back
Top