Recent content by jason.bourne

yeah. got it. thanks for helping me Shyan. yes i realized it was silly thing to ask. Shyan, let say if we have 2 second order simultaneous non homogeneous equations which are coupled, is there any way to solve it? i have included a typical problem in an attachment.

it will be very laborious right by hand calculation? is it possible to solve on MATLAB by writing code?

how do we solve an ODE which has forcing function in terms of Fourier series? i have attached a pdf file of the problem.

how do i compute modal participation factor then?

i have solved a torsional semi-definite system problem. i have uploaded the solved problem. solved for modal participation factor and effective mass. for a semi definite system we know that one of the modes is rigid mode with natural frequency 0. i think due to the presence of rigid...

understood to a greater extent. very helpful. thank you guys !

thanks for the reply AlephZero. okay. how about these following plots? plot A: can i say that there is a order at 23 Hz with almost constant amplitude? an order of 7.5 Hz is being excited at resonance so we see peak amplitudes over the speed range. am i correct...

Chris are you having a sample waterfall plot through which you can explain me these concepts of orders/resonance/impact on it? its pretty confusing.

thanks Chris. i got it what you said. check out this waterfall plot in the attachment. from what you explained, i think the set of vertical lines are resonance as they are parallel to frequency axis. in this plot, with increase in time, does the amplitude of the machine changes at a...

hi! i'm beginner in the subject of vibrations. i'm trying to understand the waterfall plots. i have attached a waterfall plot. can someone please help me to understand it? waterfall plots are used when the operating speeds are varying (run up or coast down). in this plot, as the...

yes! i totally agree with that statement. only in the case of constant pressure process the enthalpy change concept makes sense. but how about in any general polytropic process? what happens then?

for flow problems, it's very easy to understand the concept of enthalpy change when we are dealing with open system energy balance equation. from what you said does that mean for problems involving closed systems undergoing thermodynamic processes like polytropic or adiabatic, there is no...

what if it was a closed system? lets assume it was a piston cylinder problem. what would be its enthalpy change then?

Homework Statement a fluid undergoes a reversible adiabatic compression from .5 MPa, .2 m3 to .05 m3 according to the law PV1.3 = constant. determine the change in enthalpy, internal energy and work transfer during the process. Homework Equations P1V11.3 = P2V21.3 dH = T dS + V dP dS = 0...

thanks Doc Al. i think i got it. if i have any doubts further, i'll get back to you. thank you very much!