Response Definition and 486 Threads

Hi all, I have input force data and output acceleration data to calculate frequency response functions. As these data are in time domain I converted it to frequency domain using fft function in MATLAB. This is the procedure I used. As an example Let's think, Force matrix =a Acceleration...

Hi all The impulse response h(t) of an electric circuit (maybe in some special cases) is the derivative of the step response s(t) of the same circuit. right? So does it mean they have different dimension, namely if the dimension of s(t) is X, then the dimension of h(t)=ds/dt is x over...

greetings, At high frequency (more than 20kHz) the reactance of capacitor is very small and act as short circuit.this increase the loading of next stage.whats the meaning of increse of loading in next stage? RC coupled two stage amplifier circuit is here-...

I have a 2nd order system response on a graph. How would I go about this to develop the equation that models this system in s- domain when its graphed in time domain like I have ?

Homework Statement Find v(t) across a cap. in a series rlc circuit with no driving force (initial v across cap: 24V) Homework Equations from the values of the components, \alpha > \omega_0, the circuit is overdamped, and the following equation can be used: v(t) =A_1 e^{s_1 t} + A_2...

If I have the unit impulse response function for a discrete-time LTI system (Unit sequence response?), h[n], how can I calculate the time taken for the output to fall below 1% of its initial value, after a unit impulse is applied to the input? In particular, I have: h[n]=(\alpha...

Homework Statement Hi. I need help on this Matlab problem. I need to find the system response of the function, where the input is a unit step and a zero initial condition. G(s) = 1/(s+5)Homework Equations G(s)=C(s)/R(s) The Attempt at a Solution num=[1]; den=[-5]; t=0:0.1:80...

Hi all, I have a question about the response of a cmos imaging sensor. The total exposure is defined as the irradiance * pixel area * exposure time and it can be varied by changing either the irradiance or the exposure time. Would the sensor response remain constant if measurements are taken...

Homework Statement Find T,K value such that the system's percent overshoot is .254 and peak time is 3 http://img560.imageshack.us/img560/6139/problemz.png Homework Equations [PLAIN]http://img46.imageshack.us/img46/51/releq.png The Attempt at a Solution...

I asked a professor for advice on whether he thought I would do well in his course given my limited coursework. This is his response: ” Dear Mr. ..., As a science student you should know that to establish a trend line you would need to provide many data points. With your expectation of an...

ok i need some clarification if you have a circuit where a current source is in parallel with an inductor a resistor and a capacitor is this considered a natural response or a step response. I guess i thought a step response is if a switch is switched and a source is added then it is a step...

Zero input means input equals zero the input is to some differential equation D2x = Dx + x + Input the input = sin(2pi * f * t) so say I want to make a program that solves for the zero input frequency response. (Matlab actually) what would I need to set the variable for frequency to...

Hi, given the state equations of a system, x(dot) = Ax + Bu y = Cx is the impulse response function of this system C(e^(At))B? If not, how can i identify the impulse response from a given state equations? Please advise. Thank you.

If one has input x(t), then convolving x(t) with impulse response of the system would give the zero-state of the system. For example, we have a system described as : (D^{2} + 4D + 3)y(t) = (D+5)f(t). I computed system impulse response which is : h(t) = 2e^{-t} - e^{-3t} Now if say f(t) =...

Okay, since the most fluids I've studied are from the Euler equation in the context of plasma physics I may be asking a trivial question, but here goes anyway. What I am wondering about is why there is a transient response when I cap a straw with my finger, place the straw in water (while still...

Homework Statement A contininous time system has when laplace transformed, a pole in s = 0. What is de stepresponse for the system when t goes to infinity Homework Equations H(s) is infinity in 0 (H(s) is unit response laplace transformed) s(t) = h(t) * u(t) (the stepresponse is the...

Dear all In case of a material that instantaneous responds to an external applied field is P(r,t)=χE(t) Is the suseptibility then time independent? And if so, how it is possible to derive from the above equation an equation in the frequency domain? Yours

I'm not sure I'm providing enough information in order to get a meaningful reply, but I'll try anyway: Lets say you have a regulator of some sort, with a LC filter on the output, and some sort of feedback loop with an unknown transient response (i.e. you lack info on the system's phase...

the problem statement is attached. i've begun by converting everything into phasor notation but I'm not quite sure where to go from here. when i try to add the C and the L phasors, i get zero. this doesn't seem right. another problem is i have no idea what to do when i get the impedances of...

I'm writing a little 2D physics engine. The collision response is calculated by working out the impulse (and so, change in momentum) on each object, and takes into account the objects' velocities, angular velocities, and the fact that the collision normal may be in a different direction to the...

So I posted this in the Electrical Engineering forum, and with 41 views and no replies, it appears I put it in the wrong forum, so here we go... Hi, I'm currently working on a project and I was wondering whether you guys were familiar with these "devices". SMA's are shape memory alloys, and...

Hi, I'm currently working on a project and I was wondering whether you guys were familiar with these "devices". SMA's are shape memory alloys, and TEC's are thermoelectric coolers/peltiers. I tried looking for a pretty long time to find the specs on shape memory alloy (more specifically NiTiNOL)...

HELP! Impulse Response h(n) problem Please help me solve this problem. Atleast the correct answer indication is also very much appreciated. A system has impulse response h(n) = (1/2)^n-3 U(n-3) and the input is x(n) = 3^n U(n) a)Find the output by direct convolution. b)Find the output...

I have a frequency response diagram(frequency vs head) of discrete values. I have to perform Fourier analysis on these discrete values. The resultant frequency and head should be in FREQUENCY DOMAIN. how I can do this... by using FFT or any other ... using Nyquist frequency... please tell me...

y'' + 6y' + 4y = x(t) I found the eigenvalues to be -.764 and -5.24, no problems here. Next, since the order of the response is greater than the order of the excitation, I assumed the unit response took the form: h(t) = k_1e^{-.764t} + k_2e^{-5.24t} So now I must find the values for k_1 and...

I have this circuit that I have attached with the question, Its given that V=100 V, R1= 30, R2= 70 and R3 = 3. L = 1/11 H The switch in the circuit represents a current operated relay, the contact of which close when current through inductor is 0.9 A and opens again when current is 0.25 A...

Dear colleagues, I have the following question in my head: Give two canonical coordinates P, Q, and a corresponding set of equations of motions, not necessary solved. Is it possible to find analytically the action S and response Rfunctions of the system, which satisfy the relations...

i can't understand how they got the praph of the capacitator i clearly see that as the frequency goes up so does omega so the denominator goes up and the whole expression decrisses why does the gpath goes up as the frquency goes up

Hi guys. I am a Mechanical Engineering Student but we've a course called Control systems. My question is why does any system(physical like fan,motor or electronic like amplifier) have a TRANSIENT RESPONSE and specially why do electronic components like amplifiers,diode or for that matter any...

Hi Everyone, I am looking for some assistance on a problem that I have been working on for the last few weeks. I would like to optimise the performance of an accounts receivable department. In this dept there are several tools available to obtain a commitment to pay such as letters...

Hi all, I want to get Frequency Response Functions from ANSYS software. Can anyone give me a guideline? Thank you.

http://www.instantfilehosting.com/images/access/number-7427.jpg i divided the circuit into two halves. i did the first half which is from X(t) till A. i got [(1+Rb/Ra)*1/(R1C1)]/[S+1/(R1C1)] but I'm not sure if i did it right and i don't know how to do the second part. can anyone help me please

Hi looking for some help on the below I'm a little bit stuck. The effect of an earthquake on an elevated water tank is to be investigated. The water tank has mass m=2x10^6 kg and natural frequency wn=10.6 rad/s and a damping coefficient of 12% critical damping. Ground acceleration can be...

Hi, in the paper I've attached, they give a method for generating a polynomial g for the amplitude response of a filter that gives arbitrary flatness and roll-off characteristics. \frac{1}{\sqrt{1+g}} And then they say the transfer function can be easily determined from this, but they...

Homework Statement Find analytical expressions for the magnitude and phase of the frequency response for each G(s) below: (a) G(s)\,=\,\frac{20}{s\,\left(s\,+\,5\right)\left(s\,+\,5\right)}(b) G(s)\,=\,\frac{2\,\left(s\,+\,5\right)}{\left(s\,+\,1\right)\,\left(s\,+\,10\right)}(c)...

As shown in diagram attached: http://i894.photobucket.com/albums/ac149/bri22xo_photo/calcdiag.jpg A clock sits on a desk so that its center is 35 inches from the floor. The MINUTE hand is 5 inches long. Let theta (θ) be the angle between the 12 o'clock position and the minute's hand...

I would like to know the difference between pulse response and impulse response. I looked for "pulse" and "impulse" on the internet and found that on some websites they had been used interchangeably. Apart from that I checked out some books and found that they use the term "impulse response"...

Hi, I am a little bit confused about the impulse response of one electron. Assume that we have LTI system characterized by impulse response h(t) with unit gain, int{h(t)} = 1. Let the input is current i(t) [Amp]. So the output current will be i(t)*h(t). We can view it as i(t) is...

Hi,I have the equation G(s)=C(s)/M(s)=10e^(ts)/s+3 and I have to find the open loop response c(t) with a unit step which is 1/s The explanation in the Text book is quite confusing, does anyone know if there are easier explanations like worked exampled on the internet so I can work though then...

Hello everybody, When I came up to my problem, I searched all over our forum but I could not find the appropriate solution. Would you please help me: 1) http://home.sandiego.edu/~ekim/photodiode/pdtech.html#resp is the description about the response time of photodiodes and I can find the...

Integration Homework Statement Hi everyone, I'm new here. This is my first post. I found physicsforums when researching on google a solution for a doubt I've had when trying to solve rc step response. Basically, the RC analyse showed at...

Homework Statement Find the unit step response of the transfer function... a) G(s)\,=\,\frac{4}{s\,+\,4} b) G(s)\,=\,\frac{2}{0.2s\,+\,1} Homework Equations General first order step response equation... C(s)\,=\,R(s)\,G(s)\,=\,\frac{a}{s(s\,+\,a)}, where R(s)\,=\,\frac{1}{s} then do an...

Hi there... i'm working on my college project and wanted to design a high speed photosensor. The intensity of light source is quite high (actually a bomb explosion), so noise signals are not a problem. The photosensor is required to trigger other sensing devices. So which type of photosensor...

2008 AP Physics B Free Response MISTAKE? Homework Statement Question number two can be found here... http://apcentral.collegeboard.com/apc/public/repository/ap08_physics_b_frq.pdf Homework Equations The Attempt at a Solution Ok I was working out question number two and was...

I designed a spring and mass system (damping unknown) that is vibrated by applying a sinusoidal force to the mass using an electrodynamic shaker. The mass is estimated to be 100 Kg. The spring is actually 4 springs, each with a k value of 63.55 N/mm, supporting a platform (one spring at each...

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Can one model how a spring (fixed at one end) responds to a sinusoidally varying applied force ? For example, in electric circuits, the reactance of a capacitor is modeled as 1/j(omega)C and is used to obtain the current when a sinusoidally varying voltage is applied.

Guys I know how to solve the simple ones but this one has complex roots I have to find the zero input response (D-1)(D2+1)y(t)=(D2+2)f(t) y(0)=4 y'(0)=3 y''(0)=3 D2= D square. Y' = first derivative Y''= secondI know the roots are +1, j and -j But I don't know how to solve or...

The book I am currently reading derives the response of an electron to an applied sinusoidal field as: 1/[1 + 2i (w - wa)/g] = 1 / (1 + i delta) where w and wa are the induced and resonance response frequencies and g the damping constant. And delta = 2 (w - wa)/g Up to this...

Homework Statement two 10-kilogram boxes are connected by a massless string that passes over a massless frictionless pulley. The boxes remain at rest with the one on the right hanging vertically and the one on the left 2.0 meters from the bottom of an inclined plane that makes an angle of 60°...