Recent content by SFB

Why wind instruments are asymmetric?Is this a condition to get a strong standing wave ?What about a flute? Is the cylindrical enclosure helping somehow to store more energy.Also , I would be interested to know about wave propagation characteristics in the near field (fresnel zone). As it seems...

Do you have any idea on how ka values can change the wavefront pattern in the near field. Going through the basics on radiation from vibrating sphere , it seemed to me that the wavefront pattern in the near field may turn into a plane wavefront depending on the ka limit and position of the...

@Born2bwire Can you give me some guidelines on how did you generate those videos.What would be the required theories behind it ? I believe If I can manage to write codes on my own , I would be able to have enough preconception before running the actual experiments. Thanks again

@Studiot ...Thanks for your help.I am doing MS in Mechanical Engineering.

@Studiot Thanks for your reply. I am doing my first year in grad school. You can post the differential equations if you think that its going to help better explaining the problem. "This column will have a normal column resonance and the output will be this frequency for a wide range of input...

"Thus, you may be working in the Fresnel zone or near field as opposed to the far-field. But if your purpose is to get plane wave like radiation via a rigid piston than I think we can see as in my simulation that the large size of your radiator is only going to work to your benefit." You...

@Born2bewire Thanks for your email .I wanted to use a flat plate rather than a speaker because its difficult to get a nodal planes with spherical wave unless your cavity is large enough to make a planar wave approximation of the large spherical wavefronts. If my sidewalls are open...

Your videos are indeed extremely helpful tutorials for me . Would you please clarify what the idea of plane waves has to do with finite/infinite surface of the slave plate.There can always be some leakage from the waves between the speaker and plate and that may disrupts the plane waves emitted...

@Studiot ...What did you mean by periodic energy.Is it the energy coming from the driving source? I heard resonance occurs when driving freq matches the natural freqeuncy of the system. As I understand , when these two frequency match , there is periodic supply of energy from the speaker. Is...

@Studiot Thanks for the info. Would you please elaborate the phenomena . If I use the flat plate , should not I try to drive it at its resonance frequency.How do I calculate it.

If I have a honeycomb structure, then waves from radiating speaker may pass through the holes. Would not it interrupt the plain waves created by the honeycomb. I am using a 500 micron thick aluminum plate.The air gap is one wavelength so that I can form a pressure antinode on the aluminum...

Thanks for your reply. I was thinking of putting a thin metal plate infront of my speaker.The plate can be connected to the wall by springs (or some other elastic means ). In that way , the oscillation from the speaker can cause linear motion of the plate and it can generate plane waves in the...

Thank you for your reply. "The wave is going to spread out as it propagates and thus the reflected wavefront is going to be larger than the original radiator. This means that if the radiator is reflective then not all of the energy is going to be reflected back. So just having a source and a...

Thank you very much for such an excellent feedback. Your last reply clarified a lot of the ambiguities that I am facing with my experiment. Would it possible to suggest me some literatures that you believe can help me to develop a conceptual framework on spherical wave propagation and its...

Moreover , I am also confused with the waves emitting from the source. As I am using a ultrasonic spekaer (it has a vibrating membrane that vibrates when alternating voltage is applied ), I am assuming that I am getting spherical waves. What would be the reflected wave pattern if my reflector...