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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Tractors and Agricultural Machinery</journal-id><journal-title-group><journal-title xml:lang="en">Tractors and Agricultural Machinery</journal-title><trans-title-group xml:lang="ru"><trans-title>Тракторы и сельхозмашины</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0321-4443</issn><issn publication-format="electronic">2782-425X</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">301264</article-id><article-id pub-id-type="doi">10.17816/0321-4443-301264</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Theory, designing, testing</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Теория, конструирование, испытания</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Optimization of design parameters of the vibration protection system of a motor grader seat with quasi-zero stiffness</article-title><trans-title-group xml:lang="ru"><trans-title>Оптимизация конструктивных параметров виброзащитной системы сиденья автогрейдера с квазинулевой жесткостью</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5104-7568</contrib-id><contrib-id contrib-id-type="scopus">57035238500</contrib-id><contrib-id contrib-id-type="researcherid">B-5667-2015</contrib-id><contrib-id contrib-id-type="spin">2921-4760</contrib-id><name-alternatives><name xml:lang="en"><surname>Korytov</surname><given-names>Mikhail S.</given-names></name><name xml:lang="ru"><surname>Корытов</surname><given-names>Михаил Сергеевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Associate Professor, Dr. Sci. (Tech.), Professor of the Automotive Transport Department</p></bio><bio xml:lang="ru"><p>доцент, д-р техн. наук, профессор кафедры "Автомобильный транспорт"</p></bio><email>kms142@mail.ru</email><uri>https://sibadi.org/about/staff/korytov-mikhail-sergeevich/</uri><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3084-2271</contrib-id><contrib-id contrib-id-type="spin">6171-2320</contrib-id><name-alternatives><name xml:lang="en"><surname>Shcherbakov</surname><given-names>Vitaly S.</given-names></name><name xml:lang="ru"><surname>Щербаков</surname><given-names>Виталий Сергеевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. Sci. (Tech.), Professor of the Automation and Power Engineering Department</p></bio><bio xml:lang="ru"><p>д-р техн. наук, профессор кафедры «Автоматизация и энергетическое машиностроение»</p></bio><email>sherbakov_vs@sibadi.org</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0631-564X</contrib-id><contrib-id contrib-id-type="spin">8011-6829</contrib-id><name-alternatives><name xml:lang="en"><surname>Kashapova</surname><given-names>Irina E.</given-names></name><name xml:lang="ru"><surname>Кашапова</surname><given-names>Ирина Евгеньевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Postgraduate Student, Lecturer of the Automation and Power Engineering Department</p></bio><bio xml:lang="ru"><p>аспирант, преподаватель кафедры «Автоматизация и энергетическое машиностроение»</p></bio><email>iriska-97-17-13@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Siberian State Automobile and Highway University</institution></aff><aff><institution xml:lang="ru">Сибирский государственный автомобильно-дорожный университет</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2023-08-16" publication-format="electronic"><day>16</day><month>08</month><year>2023</year></pub-date><pub-date date-type="pub" iso-8601-date="2023-09-14" publication-format="electronic"><day>14</day><month>09</month><year>2023</year></pub-date><volume>90</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>233</fpage><lpage>244</lpage><history><date date-type="received" iso-8601-date="2023-02-28"><day>28</day><month>02</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-07-24"><day>24</day><month>07</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Эко-Вектор</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-09-14"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc-nd/4.0/</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/0321-4443/article/view/301264">https://journals.eco-vector.com/0321-4443/article/view/301264</self-uri><abstract xml:lang="en"><p><bold><italic>BACKGROUND</italic></bold><italic>:</italic> Vibrations occurring during operation of land transport-technological machines deteriorate the quality of control, reduce the productivity of the work performed, adversely affect the health of machine operators. In order to reduce the impact of vibrations on the operators, vibration protection systems of the cab and seat are used.</p> <p><bold><italic>AIMS</italic></bold><italic>:</italic> For practical application of the developed design of the passive vibration protection system of the motor grader operator’s seat on the basis of a parallelogram mechanism, tensile spring, cable and rollers, it is necessary to develop an algorithm for optimizing the values of design parameters.</p> <p><bold><italic>METHODS</italic></bold><italic>:</italic> The mean square value of seat acceleration in a stationary reference frame, determined as a result of simulation of the motor grader motion over a set of stochastic microprofiles of the support surface with various characteristics and velocities, was used as an optimization criterion. Comprehensive simulation mathematical model of a motor grader with cabin vibration protection supports and vibration protection system of a seat was used. All parameters of the optimization algorithm and model were divided into fixed, random and varying ones. The latter include a number of dimensions of the parallelogram mechanism of the seat vibration protection system, the coefficient of viscous friction of the mechanism’s shock absorber, the height of the quasi-zero stiffness zone. The dependence of the criterion on the design parameters of the seat vibration protection mechanism, which has an implicit pattern and is determined by means of a simulation mathematical model, served as the target function. Boundary conditions were imposed on a number of parameters to ensure the operability of the mechanism, manufacturability of its parts as well as ergonomic considerations. Optimization of the values of the varying parameters was performed with the simplex method. At the same time, a part of the parameters unambiguously influencing the value of the target function was preliminarily maximized or minimized within the boundary ranges.</p> <p><bold><italic>RESULTS</italic></bold><italic>:</italic> An algorithm for assignment and optimization of design parameters of the vibration protection system of a motor grader seat with quasi-zero stiffness is developed, one of the key features of which is the possibility to adjust the vibration protection system of the seat to the weight of the current operator. Examples of algorithm application are given.</p> <p><bold><italic>CONCLUSIONS</italic></bold><italic>: </italic>The algorithm makes it possible to determine the optimal values of design parameters of the seat vibration protection system based on a parallelogram mechanism such as: the dimensions of the parallelogram mechanism, including the attachment points of rollers and cable, the coefficient of tensile spring stiffness, the coefficient of viscous friction of a shock absorber, the parameter of adjusting the mechanism to the weight of the current operator. The key feature of the developed vibration protection system and the optimization algorithm of its design parameters is the possibility of adjustment to the weight of the current operator.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Обоснование</bold>. Вибрации, возникающие при работе наземных транспортно-технологических машин, ухудшают качество управления, снижают производительность выполняемых работ, отрицательно влияют на состояние здоровья операторов машин. Для уменьшения воздействия вибраций на операторов применяют виброзащитные системы кабины и сиденья.</p> <p><bold>Цель</bold>. Для практического применения разработанной конструкции пассивной виброзащитной системы сиденья оператора автогрейдера на основе параллелограммного механизма, пружины растяжения, троса и роликов, необходимо разработать алгоритм оптимизации значений конструктивных параметров.</p> <p><bold>Методы</bold>. В качестве критерия оптимизации использовалось среднеквадратичное значение ускорения сиденья в неподвижной системе координат, определяемое в результате моделирования перемещений автогрейдера по совокупности стохастических микрорельефов опорной поверхности с различными характеристиками и скоростями. Применялась комплексная имитационная математическая модель автогрейдера с виброзащитными опорами кабины и виброзащитной системой сиденья. Все параметры алгоритма оптимизации и модели были разделены на фиксированные, случайные и варьируемые. К последним относится ряд размеров параллелограммного механизма виброзащитной системы сиденья, коэффициент вязкого трения амортизатора механизма, высота зоны квазинулевой жесткости. В качестве целевой функции выступала зависимость критерия от конструктивных параметров виброзащитного механизма сиденья, которая имеет неявный характер и определяется при помощи имитационной математической модели. На ряд параметров были наложены граничные условия из соображений обеспечения работоспособности механизма, технологичности изготовления его деталей, а также эргономических соображений. Оптимизация значений варьируемых параметров выполнялась Симплекс-методом. При этом часть параметров, однозначно влияющих на значение целевой функции, предварительно максимизировалась, либо минимизировалась в пределах граничных диапазонов.</p> <p><bold>Результаты</bold>. Разработан алгоритм назначения и оптимизации конструктивных параметров виброзащитной системы сиденья автогрейдера с квазинулевой жесткостью, одной из ключевых особенностей которого является возможность подстройки виброзащитной системы сиденья под массу текущего оператора. Приведены примеры применения алгоритма.</p> <p><bold>Заключение</bold>. Алгоритм позволяет определить оптимальные значения конструктивных параметров виброзащитной системы сиденья на основе параллелограммного механизма: размеров параллелограммного механизма, в том числе точек крепления роликов и троса, коэффициента жесткости пружины растяжения, коэффициента вязкого трения амортизатора, параметра подстройки механизма под массу текущего оператора. Ключевой особенностью разработанной виброзащитной системы и алгоритма оптимизации ее конструктивных параметров является возможность подстройки под массу текущего оператора.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Vibration protection</kwd><kwd>motor grader</kwd><kwd>seat</kwd><kwd>microprofile</kwd><kwd>acceleration</kwd><kwd>parallelogram</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>виброзащита</kwd><kwd>автогрейдер</kwd><kwd>сиденье</kwd><kwd>микрорельеф</kwd><kwd>ускорение</kwd><kwd>параллелограммный</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Aiello G, Vallone M, Catania P. Optimising the efficiency of olive harvesting considering operator safety. Biosystems Engineering. 2019;185:15–24. doi: 10.1016/j.biosystemseng.2019.02.016</mixed-citation><mixed-citation xml:lang="ru">Aiello G., Vallone M., Catania P. 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