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Old 22nd March 2013, 10:00 AM   #3211
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Quote:
Originally Posted by more10 View Post
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.
Hi Mårten,

If you care to post your proposed design I would be happy to calculate the diaphragm pressure for you.

You can add the large chamber to a separate design for me to check as well, if you like.

At this stage I have no plans to add any further charts to the production version of Hornresp.

Kind regards,

David
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Old 22nd March 2013, 11:32 AM   #3212
more10 is offline more10  Sweden
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David

I am very grateful for you help. My hornresp record.

Best regards

Mårten
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Old 23rd March 2013, 06:42 AM   #3213
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Quote:
Originally Posted by more10 View Post
I am very grateful for you help.
Hi Mårten,

You're welcome :-).

Attachment 1 shows the pressure at the throat, and attachment 2 shows the pressure on the diaphragm. In each case, resonances are unmasked.

As mentioned previously, when resonances are masked the results are the same.

Kind regards,

David
Attached Images
File Type: png Throat_Press.png (58.1 KB, 100 views)
File Type: png Diaphragm_Press.png (57.9 KB, 94 views)
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Old 25th March 2013, 07:04 AM   #3214
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Default Hornresp Update 3130-130325

Hi Everyone,

CHANGE 1

The accuracy of the normalised polar map for a constant directivity horn has been improved at those frequencies where the off-axis pressure is greater than the on-axis pressure.

Attachment 1 shows an example where the off-axis pressure is greater than the on-axis pressure across a beamwidth of approximately 64 degrees.

Attachment 2 shows an example of the old normalised polar map.

Attachment 3 shows the new normalised polar map for the same horn system.

My thanks to AllenB for the query that prompted me to investigate this issue.

CHANGE 2

The throat sound pressure chart has been changed to a diaphragm pressure chart showing the peak sound pressure at the driver diaphragm, and the particle velocity chart has been changed to a diaphragm velocity chart showing the driver diaphragm peak velocity.

The diaphragm pressure chart can be selected from the Tools menu when the SPL response window is displayed.

The diaphragm velocity chart can be selected from the Tools menu when the diaphragm displacement window is displayed.

My thanks to Mårten (more10) for the query that prompted me to make this change.

Kind regards,

David
Attached Images
File Type: png Pattern.png (43.9 KB, 75 views)
File Type: png Norm_old.png (162.8 KB, 75 views)
File Type: png Norm_New.png (172.5 KB, 71 views)
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Old 25th March 2013, 07:56 AM   #3215
Zero D is offline Zero D  United Kingdom
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Lightbulb Plug in/s etc

@ David McBean

Hi, the diaphragm pressure/velocity charts will prove Extremely helpful Thanks

I know you incorporated some visualisation software from another member, into HR last year. So it occurred to me that, as this is possible to do, i thought that due to the fact that many people, my self included, have requested a filter to be included in HR, this would/could be a way to achieve it =

Right now i don't know who could provide this Plug In, for want of a better description. But i'm sure there must be someone who could. If you agreed, at least to consider it, the word would spread & i feel sure someone would come forward & offer to assist.
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Old 25th March 2013, 08:21 AM   #3216
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Quote:
Originally Posted by Zero D View Post
So it occurred to me that, as this is possible to do, i thought that due to the fact that many people, my self included, have requested a filter to be included in HR, this would/could be a way to achieve it
Hi Zero D,

Nice try, but it's not going to happen :-).

Kind regards,

David
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Old 25th March 2013, 11:18 AM   #3217
AllenB is offline AllenB  Australia
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Ah, so the old method of normalising was going up over the zero degree point in places? Good find! This is much easier to read.
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Old 25th March 2013, 01:24 PM   #3218
tb46 is offline tb46  United States
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Location: Texas
Hi David,

How does one get from diaphragm velocity to throat velocity?

Regards,
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Old 26th March 2013, 12:04 AM   #3219
Mark Kravchenko --- www.kravchenko-audio.com
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Location: Perth Canada
If we all ask for filters do we get it?

Would so change what we can do with this evil little program.

But the floodgates could open for types of filters.

Oh the horrors!
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Old 26th March 2013, 11:25 AM   #3220
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Quote:
Originally Posted by AllenB View Post
Ah, so the old method of normalising was going up over the zero degree point in places?
Hi AllenB,

With the old method, the on-axis (zero degree) pressure was the maximum level that could be displayed. Off-axis pressures higher than the on-axis pressure were incorrectly shown to be at the same level as the on-axis pressure. Now off-axis pressures higher than the on-axis pressure are correctly displayed.

Kind regards,

David
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