Multiple-Degree of Freedom Cavity Resonator Diary

I had some reports that GUI software could not be downloaded. I reviewed the HTML source and replaced the files and the HTML source. Now GUI version of simulation software became available again. Visit http://mcap.webcrow.jp/software.html .

I recently devote myself to poor audio. I recognized that the most important thing of the audio hobby is technology. Important information is found everywhere around usual life. UP4D technology was found from poor audio trial. Limited materials like rough woods limited enclosure design, driver layout, size and so on. It made me realized the advantage of unparallel driver layout. Now I am trying the next UP4D application. I try UP4D cavity resonator system. Previous one was pipe resonator. Cavity resonator system is somewhat advantageous for size and shape compared with pipe resonator. Now I will incorporate pipe resonator with cavity resonator. I will see what it can.

This is the real giant. It is the first ever commercial product of multiple-degree of freedom cavity resonator type loudspeaker system! She is the president of DreamsounD where my friend devotes himself for true high-fidelity music presenter loudspeaker system. You will imagine how big it is!　She is not a dwarf. Once my friend wrote to me since he got interested in MCAP-CR. He had other multiple-degree of freedom cavity resonator project. I helped him for a little bit analysis part. He was really much impressed with the performance of the model. He wrote to me that he had never experienced such presence of music with the new system. I wish I could hear it. France is too far from Japan. Visit DreamsounD for more details. Ciao!

I recently noticed that the single file size is limited to only 250kB by FC2 free website. Therefore, some simulation program files were deleted by server. I have to find how to avoid this restriction. I know that standard paid service can avoid this restriction; however, I do not get any money from this research! I want to use free web service, unless there comes any sponsor... I feel sad research does not make money...

How are your holidays? New simulator is just released. Latest simulator runs a number of simulation cases at the same time. You can just add some volume to certain chamber or adjust duct size a little bit and estimate where the best design is. Just try. It is easy. Manual is included in the package. Windows 32bit executable, additional DLL file for non MinGW users, and sample input files are included. Visit http://mcap.web.fc2.com/software.html .

Do you enjoy Christmas holidays? I wish you Merry Christmas and a Happy New Year. I noticed that this blog has not been updated. I would like to resume Field Presenter Application in January. I have been struggling with the MCAP-CR simulator. It is a CUI version, but CUI version is more important simulator than GUI version. I added new feature to the DFT version simulator. Last one required users lots of executions, because it can handle only one simulation case. Next version will be able to handle a number of simulation cases. It made me easier to find effects of chamber volume, duct size variations to frequency responses. I am sure it will help designing not only MCAP-CR simulators but also double-bass-reflex.

I have been studying dynamics of moving masses for multiple-degree of freedom cavity resonator applications. It is interesting, because (I have seen) no study about multiple-degree of freedom model. It is not too much difficult like continuum mechanics. Therefore, I could have developed simulator programs of multiple-degree of freedom models. On the other hand, pipe resonator model is continuum mechanics model, so that it requires another technique to develop simulator models. It is true that just calculating characteristic frequencies of pipe resonator is easy; however, using calculation formulas, we do not know exact behavior of a cavity resonator application. I will not study pipe resonator model for a time being. The reason why I adopted pipe resonator for the field presenter application was not to compensate low frequency response, but to realize slim body. Slim body is advantageous for field presentation, because slim body does not sound field as much as big enclosure b...