Waveform Definition and 129 Threads

I've just wired in a 1kw grid tie inverter, feeding the power from solar panels into the mains grid, ( in Thailand , so no rules or regulations). There are some problems I've noticed. Toaster buzzes , but works. Induction cooker won't work, lights come on , fan works but no heat delivered, when...

I am doing a homework problem for my Power Electronics class. I have attached the relevant image. My question is, (referring to the TOP plot) why is the voltage regulator waveform (purple curve) identical to the voltage waveform coming from the diode bridge (green curve)? Shouldn't it be the...

An M.I.T. Physics lecture mentioned B and E crossing over the x-axis as lowest energy state/position of the wave(s). Along the x axis, path of photon, is photon momentum here the lowest also? Does momentum vary? For a tiny target, if a photon collides at this exact point is there no momentum...

Homework Statement Sketch the waveform and develop its Fourier series. f(\omega t)= \begin{cases} 0 & if & 0 \leq \omega t \leq \frac{π}{2} \\ V*sin(\omega t) & if & \frac{π}{2} \leq \omega t \leq π\\ 0 & if & π \leq \omega t \leq \frac{3π}{2} \\ V*sin(\omega t) & if & \frac{3π}{2} \leq...

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...

What is the current thinking about the waveform of photons? How can finite signals in the time domain produce a discrete frequency response in the frequency domain? As anyone who has worked with signal analysis remembers, the Fourier transforms of time signals in the real world always produce...

Homework Statement what type of waveform would this make ? Homework Equations V(t)=2/π(sin(ωt)+1/2sin(2ωt)+1/3sin(3ωt)+1/4sin(4ωt)+...) 5sin(ωt)+5sin(2ωt)+5sin(3ωt)+5sin(4ωt)... The Attempt at a Solution

Having some trouble with this question, A complex wave is described by equation, y=100 sin ωt+30 sin(3ωt-∏/2) A) on the same axis sketch and label, 1)one cycle of the fundamental waveform 2)the third harmonic 3) the complex waveform(y) ω=2∏f T=2∏/ω Not sure where to...

Homework Statement Q) State the equations of the wave forms which: a) Leads sin ωt by ∏/2 and b) Lags sin (ωt+∏/6) by ∏/3 Homework Equations I could not think of any relevant equations. The Attempt at a Solution a)Sin ωt will be when t=0 Sin ω(t-a) will be 0 when t-a, since...

Hi everyone, My 14 year old son who is an avid musician and composer, wants to do a science project that involves waveform analysis of tonal harmony in Western music, for example, why certain chords and chord progressions are more pleasing than others and whether the interference patterns...

Homework Statement Plot the output voltage V0 versus time of the circuit below. Assume Vgamma=0 for the diode. Clearly mark the values on the plot for full credit Homework Equations KVL KCL The Attempt at a Solution I have uploaded mt attempt the dotted line is the input waveform...

Homework Statement The question is in regards to a homework problem, but I only need clarification on how to interpret the graph of a waveform. Homework Equations N.A. The Attempt at a Solution N.A. I've attached the image. I am assuming that one cycle of the waveform takes...

A few new student questions: following collapse of the waveform, does the waveform ever reform? If so, and if entangled particles are involved, does the entangled twin reform as well? And if so, does this require forward progression in time, in other words, might the entangled twin decollapse...

Homework Statement The problem is located here http://www.chegg.com/homework-help/determine-average-rms-value-waveform-depicted-fig-1136-chapter-11-problem-26e-solution-9780073529578-exc Homework Equations Rms=sqrt(1/T∫ from 0 to T of i(t)^2 DT ) Average= couldn't find an equation in...

Hi there, I have recently come across some data that is supposed to be random, but I don't think it is. I graphed it out and it sure doesn't look random. I also ran a couple of statistical tests such as the runs test, and they all say "not random." Visually, the data looks like a piece of...

Homework Statement From the waveform shown below, estimate a) the damping ratio ζ (you may compare response with a standard chart); b) the forced or damped frequency of oscillation; and c) the natural or undamped frequency of oscillation. Homework Equations Since the waveform is under...

Hey everyone, just got a quick question in acoustics. I am mainly looking for a mathematical understanding Homework Statement Consider two harmonic plane progressive waves of the form \tilde{P(x)} = \tilde{A}e-jkx and\tilde{P(x)} = \tilde{B}e+jkx traveling in opposite directions. Showing...

Homework Statement Alpha=0.91 ,beta=2.92, T0=0.91 Homework Equations The value of a0 for the square waveform The Attempt at a Solution 1/T0 * area = 1/0.91*(2.92-0.91)*0.91

Hi all, How would I calculate theoretical power of: 1Vpp 1Mhz (sinewave) 200 cycles 100ms interval 50Ω load This waveform is going into a 55db amplifier. Any help would be great. Thanks, Mark

I have an asymmetrical clipped repeating waveform and I want to be able to find the root mean square. The function is as follows, with r and b constants: y(t) = ((exp(sin(t)*b)-exp(-sin(t)*b*r))/(exp(sin(t)*b)+exp(-sin(t)*b)))*(1/b) This is pretty computationally heavy. What are some...

I am wondering how the waveform of AC voltage measured across a diode would look like? What about the waveform of the resistor connected in series with this diode? Please help .

Homework Statement Hi in response to my previous thread (principles behind the waveform selector circuit), I would now like to run a SPICE simulation using the PSPICE schematics software to obtain the theoretical values before entering my lab session. I have uploaded the schematic for your...

Homework Statement Hi i have a practical project that i am working on. I am working on a waveform selector circuit. My circuit is part two of three circuits. The first circuit is a signal generator followed by the waveform selector and then a filter rectifier. I am required to produce a report...

Homework Statement Homework Equations ω=2\pif The Attempt at a Solution After converting it from time domain to phasor domain my answer is I=17.6\angle25mA. How am I suppose to show the current at time = 2 sec? Do I just plug in 2 and find the sine of it?

Homework Statement Given an AC Voltage that varies in time according to the equation: v(t) = 100 sin(250t) (i) What is the frequency of this waveform? (ii) Calculate the time for one complete cycle of the voltage? (iii) Calculate the instantaneous value of the voltage at time =...

My mat lab skills are pretty low, basically i want to know how to make a waveform using 1000 points of data. if the data is for example y = 1 for 0<n<0.1 y = 2 for 0.1<n<0.5 y = -5 for 0.5 < n < 1 so how could i plot this waveform using 1000 points of data cheers

I have an experiment where I calculate a value based on a waveform acquired by a digitizing oscilloscope. Since the signal is very noisy, I need to average the results many times to get a reasonably accurate value for each measured data point. My question is how should I spend the time averaging...

Hi, Can I get some learning material or guidance on how to build equipment for generating specific waveforms of DO-160 section 22? Thanks

Homework Statement I've spent the last hour trying to get this, and it's starting to drive me crazy! I'm not sure how to approach the waveform, as there are two forms? I'm guessing that the period in this case is 4 seconds, and they've included a second wave to reiterate that? Homework...

Hello, I am wondering what sort of visual differences you would see between an AM modulated waveform with carrier and a DSBSC waveform (suppressed carrier) in the time domain on an oscilloscope. Any help would be appreciated.

I am a bit confuse on the back EMF waveform shape of the brushless permanent magnet machine. As I know brushless DC permanent magnet motor has a trapezoidal shape back EMF waveform. If I use this motor as a generator, do I still get the same waveform shape or I will get a sinusoidal waveform?

Hello, I need to sketch the frequency domain for the following AM waveform showing total bandwidth and frequency. 8sin(2pi500kt - 4cos(2pi530kt) + 4cos(2pi(470kt) I have attached an attempt I have made. Does anyone know if I have this correct or not ? Thanks kindly for any input.

Homework Statement An A.C. voltage, V comprises of a fundamental voltage of 100V rms at a frequency of 120Hz, a 3rd harmonic which is 20% of the fundamental, a 5th harmonic which is 10% of the fundamental and at a phase angle of 1.2 radians lagging. i) Write down an expression for the...

I have an assessment at the moment and one of the questions is about the conversion of an Analogue wave to Digital one. I know how it is graphed and the basic concepts but I have no idea how to express it being forced into a grid. I was wondering if anyone knew any websites or books which has...

As part of a lab report I have to determine the speed of a motor from the PWM waveform. The motor in question is a lego motor, of type at disassembled at http://www.philohome.com/motors/motor.htm. It has three coils on the rotor and a 4 pole permanent magnet stator. This is the waveform I...

Continious FT of a rectangle is real valued but DFT of it is not!? Continious Fourier Transform of a rectangle with amplitude of 1 between [-u,u] is a real valued function (u is a positive number). Actually it is a sinc function. However when I use discrete Fourier Transform (fft) I obtain...

Homework Statement Create 512 element triangular waveform (In Matlab) x(k)= k 0≤k≤7 8-k 8≤k≤23 -32+k 24≤k≤31 For 0≤k≤31 repeating every 32 elements. Homework Equations N/A The Attempt at a Solution Ok so I am confused on how to code...

How to write a function by analysing/looking at a signal? Hello everyone. I have attached one waveform/signal. I want to know how can I represent it mathematically. I have been studying about functions that are already defined, say, a function like this f(x)=4Sinx + 2Cosx | x is in some...

How do we represent data in terms of impulse waveform ??

Hi All As the title of this thread suggest, I am looking for ways to recognize patterns in an analog waveform. Well the obvious answer to this question is use Artifical Neural Network (ANN) as ( from the text on google) its been used for pattern recognition and all sorts of stuff. I've been...

Homework Statement For an even function, the Fourier series takes the form ^{\infty}_{n=0}\Sigma A_n cos(\frac{2\pi n x}{\lambda}) where \lambda is the wavelength of the function. In this problem you will see how to find the Fourier coefficients A_n. a.) Prove that A_0 =...

Hi all. A transformer is driven with a square wave pulse. The transformer has three secondary coils all in series, a diode is placed between two of them which is forward biased during the on time. The coils are used to charge a capacitor and limit current. When the transformer is pulsed...

Hi everyone, I am currently doing some experimentation with electromagnetic coils, I realize I will need a waveform amplifier for the testing using my rsr32 function generator. Could someone point me in the direction of a decently priced one?

I'm trying to design a pickup/reluctor that produces a specific waveform. I'm using an automotive ignition pickup and expermenting with different shapes of reluctor but the results I'm getting aren't making any sense. The pickup/reluctor are of the familiar design with a pickup coil wound...

I'm working on a voice synthesizer. I have my computer set up to accept an 8-bit 44kHz waveform. I'm feeding it sines, adding sines together, and so on. It works great. However, I want to generate a sound given a frequency histogram. That is, I want to generate noise that has a specific...

Homework Statement A capacitance of 60 \mu F has the voltage waveform shown in Fig. 2-36. Find P_{max}. [PLAIN]http://img828.imageshack.us/img828/5255/unled2copy.jpg Homework Equations p(t)=i(t)u(t)=\left(C\frac{du(t)}{dt}\right)u(t)The Attempt at a Solution When is power at maximum? Is it...

Homework Statement An inductance of 3 mH has the following voltage waveform: for 0<t<2\text{ }ms, v=15\text{ }V; for 2ms<t<4ms, v=0; and for 4\text{ }ms<t<6\text{ }ms, v=-30\text{ }V. Assuming i(0)=0, find the current at time (a) 1 ms, (b) 4 ms, (c) 5 ms. Ans. (a) 5 A; (b) 10 A; (c) 0Homework...

Hello, :smile: I did an experiment on full wave rectification using center tap transformer. The transformer read: Input 220V, Output 12V, 12V. I used two diodes and 1 micro farad capacitor. As you see capacitor's capacitance is very little so it didn't effect the overall output because I...

Hi, :wink: In the link given below circuit #1 and #2 are same except that they have opposite polarities for the battery V. On the left bottom there is output waveform after the clipping. In the beginning I was thinking that output for both circuits, #1 and #2, will be same. But now I am...

Homework Statement What causes the output distortion seen in the above diagram? Output on right, input on left. The Attempt at a Solution This isn't homework, just something I can't figure out, playing with a simulator. The gain here is dependent on the input voltage... but why is the output...