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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">novtexmech</journal-id><journal-title-group><journal-title xml:lang="ru">Мехатроника, автоматизация, управление</journal-title><trans-title-group xml:lang="en"><trans-title>Mekhatronika, Avtomatizatsiya, Upravlenie</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1684-6427</issn><issn pub-type="epub">2619-1253</issn><publisher><publisher-name>Commercial Publisher «New Technologies»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17587/mau.20.143-151</article-id><article-id custom-type="elpub" pub-id-type="custom">novtexmech-593</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>СИСТЕМНЫЙ АНАЛИЗ, УПРАВЛЕНИЕ И ОБРАБОТКА ИНФОРМАЦИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SYSTEM ANALYSIS, CONTROL AND INFORMATION PROCESSING</subject></subj-group></article-categories><title-group><article-title>Новые уравнения для расчета плотности морской воды на основе измерений скорости звука</article-title><trans-title-group xml:lang="en"><trans-title>New Equations for Sea Water Density Calculation Based on Measurements of the Sound Speed</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Греков</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Grekov</surname><given-names>A. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кандидат технических наук, заведующий лабораторией полигонных систем мониторинга окружающей среды.</p><p>Севастополь.</p></bio><bio xml:lang="en"><p>Grekov Aleksandr N. - PhD, Laboratory Head, Laboratory of field monitoring systems.</p></bio><email xlink:type="simple">grekov@protonmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Греков</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Grekov</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Доктор технических наук, руководитель центра, Специальное научно-конструкторское и технологическое бюро.</p><p>Севастополь.</p></bio><bio xml:lang="en"><p>Special Scientiﬁc Design and Technology Bureau.</p><p>Sevastopol, 299011.</p></bio><email xlink:type="simple">ngrekov1@ya.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сычев</surname><given-names>Е. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Sychov</surname><given-names>E. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кандидат технических наук, ведущий научный сотрудник, лаборатория полигонных систем мониторинга окружающей среды.</p><p>Севастополь.</p></bio><bio xml:lang="en"><p>Laboratory of ﬁeld monitoring systems.</p><p>Sevastopol, 299011.</p></bio><email xlink:type="simple">sychov-e@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт природно-технических систем</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Natural and Technical Systems</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>06</day><month>03</month><year>2019</year></pub-date><volume>20</volume><issue>3</issue><fpage>143</fpage><lpage>151</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Commercial Publisher «New Technologies», 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Commercial Publisher «New Technologies»</copyright-holder><copyright-holder xml:lang="en">Commercial Publisher «New Technologies»</copyright-holder><license xlink:href="https://mech.novtex.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://mech.novtex.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://mech.novtex.ru/jour/article/view/593">https://mech.novtex.ru/jour/article/view/593</self-uri><abstract><p>Плотность  является  одним  из  важнейших свойств  морской  воды и используется в различных  морских  исследованиях  и  технологиях.  Традиционно  в  практике  океанографических исследований принято  рассматривать  плотность как  зависимый  параметр, который  является  функцией  нескольких других  параметров, принятых  в качестве независимых. Обычно следующие  три параметра  используются в качестве  независимых параметров:  температура, гидростатическое давление  и соленость.  Вопросы измерения температуры  и гидростатического давления insitu технологически  хорошо разработаны, в то время как  при измерении  солености  все еще остаются  нерешенные  проблемы. Это связано  с тем, что соленость  является  таким  свойством, которое  просто невозможно  прямо измерять  insitu. Для  устранения  проблем, связанных   с измерениями  солености, авторы  разработали  специальное  уравнение  нового вида.  Это уравнение  нового вида выражает  плотность  морской  воды через независимые  и измеренные  insitu параметры: температуру, гидростатическое давление  и скорость  звука.  Новизна  этого  подхода  заключается в том, что использование скорости  звука  в качестве  одного из аргументов  позволяет обойтись без измерения солености  морской воды при определении  плотности  морской  воды. Авторы  разработали два таких  уравнения для двух  случаев  использования. Первое  уравнение  предназначено  для использования в технических приложениях и воспроизводит плотность морской  воды  в  широком  диапазоне  параметров   водной  среды  со  среднеквадратическим отклонением 0,062  кг/м3. Второе  более точное  уравнение  предназначено  для научных  применений  и воспроизводит плотность  морской  воды в более узком  океанографическом диапазоне  параметров  со среднеквадратическим отклонением 0,0018 кг/м3.</p></abstract><trans-abstract xml:lang="en"><p>Density is one of the most important properties of seawater and is used in various marine research and technology. Traditionally, in the practice of oceanographic research, it is customary to consider density as a dependent  parameter, which is a function of several other parameters taken  as independent.  Usually the following three parameters are used as the independent  parameters: temperature, hydrostatic  pressure  and  salinity.  The  issues  of  temperature  and  hydrostatic  pressure  measuring  in  situ  are  technologically  well developed,  while in the salinity measuring there are still unsolved problems. This is due to the fact that salinity is such a property that it is simply impossible to determine  directly in situ. To  eliminate  the problems associated  with measurements  of salinity, the authors developed  the special new kind  equation.  That  equation  of the new kind  express the density  of sea water through independent  and in situ measured  parameters:  temperature, hydrostatic  pressure and  sound  speed.  The  novelty  of this approach  is that  using of the sound speed as the independent  parameter makes  it possible to exclude measurements  of salinity. The authors developed two such new equations  for the different cases of using. The  first new equation  is intended  for use in technical  applications and reproduces the sea water density in a wide range of the aquatic environment  parameters with a root mean square deviation  of 0.062  kg/m3. The  second more precise new equation  is intended  for scientific applications  and  reproduces the sea water density  in a narrower oceanographic range of parameters with a root mean  square deviation  of 0.0018  kg/m3.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>уравнение  состояния</kwd><kwd>морская вода</kwd><kwd>плотность</kwd><kwd>скорость  звука</kwd><kwd>TEOS-10</kwd><kwd>среднеквадратическое отклонение</kwd></kwd-group><kwd-group xml:lang="en"><kwd>equation  of state</kwd><kwd>sea water</kwd><kwd>density</kwd><kwd>sound velocity</kwd><kwd>TEOS-10</kwd><kwd>root mean  square deviation</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Le Menn M. Measurements at Sea, Instrumentation and Metrology in Oceanography, pp. 295—351.</mixed-citation><mixed-citation xml:lang="en">Le Menn M. 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