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Old 11th March 2013, 07:35 AM   #3201
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Join Date: Jun 2007
Default Hornresp Update 3120-130311

Hi Everyone,

Under certain conditions the new 'Radiation Angle' tool menu command could be enabled even when the input parameters window was not in edit mode. This anomaly has been now fixed, with the menu command only being enabled when the Ang parameter value has the focus in edit mode.

EDIT - Have just found another bug (will try to release a further update tomorrow).

Kind regards,

David
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Old 11th March 2013, 07:50 AM   #3202
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Quote:
Originally Posted by mwmkravchenko View Post
Nice touch.

Thanks David!
Hi Mark,

It is something that I have been meaning to do for a while, but I only just managed to get around to it :-).

Kind regards,

David
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Old 12th March 2013, 05:11 AM   #3203
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Default Hornresp Update 3120-130312

Quote:
Originally Posted by David McBean View Post
EDIT - Have just found another bug (will try to release a further update tomorrow).
Hi Everyone,

With reference to my comment above, when the Ang parameter value was changed using the new 'Radiation Angle' tool, the value would revert back to the original value when a different record was selected. This bug has now been fixed.

Kind regards,

David
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Old 20th March 2013, 11:04 PM   #3204
AllenB is offline AllenB  Australia
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David, is the high frequency disturbance in this polar map due to mouth diffraction? Is it possible to model a conical horn like this with the intended mouth treatment added, or alternately to eliminate this diffraction from the model so I can see the directivity of the horn at these frequencies?
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Old 21st March 2013, 04:51 AM   #3205
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Quote:
Originally Posted by AllenB View Post
David, is the high frequency disturbance in this polar map due to mouth diffraction? Is it possible to model a conical horn like this with the intended mouth treatment added, or alternately to eliminate this diffraction from the model so I can see the directivity of the horn at these frequencies?
Hi AllenB,

To allow me to investigate further, could you please post a screenprint of the input parameter window values that produce this result. Thanks.

Kind regards,

David
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Old 21st March 2013, 09:04 AM   #3206
more10 is offline more10  Sweden
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Location: Solna
David

I have a question regarding the "Window/SPL Response/Tools/Sound Pressure" function.

Does the "Horn Throat Peak Sound Pressure" reflect the pressure at S1 or the pressure in the front chamber?

What I really would like to know is the pressure on the cone.

Mårten
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Old 21st March 2013, 06:45 PM   #3207
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by David McBean View Post
Hi AllenB,

To allow me to investigate further, could you please post a screenprint of the input parameter window values that produce this result. Thanks.

Kind regards,

David
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File Type: gif d.gif (109.6 KB, 103 views)
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Old 22nd March 2013, 07:09 AM   #3208
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Quote:
Originally Posted by more10 View Post
Does the "Horn Throat Peak Sound Pressure" reflect the pressure at S1 or the pressure in the front chamber? What I really would like to know is the pressure on the cone.
Hi Mårten,

The Horn Throat Peak Sound Pressure chart shows the pressure at S1 for a normal horn, and at S2 for an offset driver or tapped horn.

With the resonances masked option selected, the calculated pressure on the horn-facing side of the diaphragm will be the same as the pressure at the throat . With the resonances not masked option selected, the pressure on the diaphragm will be marginally higher than the pressure at the throat, but not enough to be of any concern.

To illustrate -

Attachment 1 shows the pressure at the throat S1 of the default record with resonances unmasked.

Attachment 2 shows the pressure on the horn-facing side of the diaphragm of the default record with resonances unmasked.

As you can see, the difference between the two charts is minimal.

Kind regards,

David
Attached Images
File Type: png Pressure1.png (53.9 KB, 92 views)
File Type: png Pressure2.png (53.8 KB, 87 views)
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Last edited by David McBean; 22nd March 2013 at 07:15 AM.
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Old 22nd March 2013, 08:09 AM   #3209
more10 is offline more10  Sweden
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Thanks for you explanation David

I am designing a bass horn with extremely high compression ratio. The throat pressure is double of anything else I have built. I am a bit concerned with breaking the cone. So I thought maybe I can lower the pressure by adding a big front chamber.

I would like to add calculation of pressure on the cone to the wishlist.
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Old 22nd March 2013, 09:42 AM   #3210
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Quote:
Originally Posted by AllenB View Post
David, is the high frequency disturbance in this polar map due to mouth diffraction? Is it possible to model a conical horn like this with the intended mouth treatment added, or alternately to eliminate this diffraction from the model so I can see the directivity of the horn at these frequencies?
Hi AllenB,

Thanks for providing the additional information.

The high frequency disturbance you are seeing is not due to mouth diffraction. The directivity patterns produced by Hornresp are such that when the results for all frequencies are consolidated into a single polar map, the results as shown in your example are produced. It is not possible to readily change the model.

You may find that the normalised polar map view (where values are shown relative to the on-axis pressure) gives a better indication of directivity - see Attachment 1.

The beam width chart can also be useful in highlighting directivity characteristics - see Attachment 2, which clearly shows the constant directivity effect at higher frequencies.

Individual patterns can also be viewed at selected frequencies to further illustrate directivity characteristics - see Attachment 3.

Kind regards,

David
Attached Images
File Type: png Polar.png (162.8 KB, 90 views)
File Type: png Beam.png (57.9 KB, 22 views)
File Type: png Pattern.png (44.3 KB, 27 views)
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Last edited by David McBean; 22nd March 2013 at 09:45 AM.
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