Experimental studies of the influence of elastic-dissipative parameters of engine mounting units on the dynamic characteristics of the “wing model – elastic pylon – engine” system
A feature of modern heavy transport aircraft is their layout with engines on elastic pylons under the wing, with the fuel tanks located in the wing consoles. In this case, the main elastic tones of the aircraft’s own oscillations, which determine its dynamic response to external disturbing influence...
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Moscow State Technical University of Civil Aviation
2024-05-01
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| Series: | Научный вестник МГТУ ГА |
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| Online Access: | https://avia.mstuca.ru/jour/article/view/2339 |
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| author | Y. V. Petrov M. V. Semakova V. G. Ugreninov |
| author_facet | Y. V. Petrov M. V. Semakova V. G. Ugreninov |
| author_sort | Y. V. Petrov |
| collection | DOAJ |
| description | A feature of modern heavy transport aircraft is their layout with engines on elastic pylons under the wing, with the fuel tanks located in the wing consoles. In this case, the main elastic tones of the aircraft’s own oscillations, which determine its dynamic response to external disturbing influences, include the so-called motor tones (vertical and horizontal (lateral) oscillations of engines on elastic pylons). A new type of flutter has appeared – pylon, which for some aircraft determines the critical flutter speed of the aircraft as a whole. The main reason for this phenomenon is the low oscillation damping of the engine on the pylon under the wing. Therefore, research aimed at modernizing the engine mounting points on the pylon in order to reduce the level of elastic oscillations during aircraft operation seems relevant. One of the possible ways to solve this problem is to use the concept of a freed engine, when the engine attachment points to the pylon are modernized, providing more effective damping of engine oscillations. In order to confirm the possibility of practical implementation of these solutions, corresponding experimental studies were carried out on an experimental setup developed by the authors. A design of engine mounting units has been developed that allows specified displacements of the engine relative to the pylon during forced elastic oscillations of the system, which includes a hinged suspension, installation of additional elastic elements and hydraulic dampers.The article presents the results of studies of the influence of elastic-dissipative parameters (partial frequency of natural oscillations and partial decrement of oscillations) of an engine mount on an elastic pylon on the dynamic characteristics of the dynamic system “wing model – elastic pylon – engine”. It is shown that by introducing specially designed engine suspension units on pylons, it is possible to significantly change the dynamic characteristics (frequencies and amplitudes of natural oscillations) of the elastic system as a whole. Thus, the amplitudes of oscillations of the engine’s center of mass in the region of motor tones decrease by 3...7 times during forced harmonic oscillations. |
| format | Article |
| id | doaj-art-c9ce336d08e6422fbb1ce0b53a9660e8 |
| institution | DOAJ |
| issn | 2079-0619 2542-0119 |
| language | Russian |
| publishDate | 2024-05-01 |
| publisher | Moscow State Technical University of Civil Aviation |
| record_format | Article |
| series | Научный вестник МГТУ ГА |
| spelling | doaj-art-c9ce336d08e6422fbb1ce0b53a9660e82025-08-20T02:59:50ZrusMoscow State Technical University of Civil AviationНаучный вестник МГТУ ГА2079-06192542-01192024-05-012729410210.26467/2079-0619-2024-27-2-94-1021516Experimental studies of the influence of elastic-dissipative parameters of engine mounting units on the dynamic characteristics of the “wing model – elastic pylon – engine” systemY. V. Petrov0M. V. Semakova1V. G. Ugreninov2The Moscow State Technical University of Civil AviationThe Moscow State Technical University of Civil AviationThe Moscow State Technical University of Civil AviationA feature of modern heavy transport aircraft is their layout with engines on elastic pylons under the wing, with the fuel tanks located in the wing consoles. In this case, the main elastic tones of the aircraft’s own oscillations, which determine its dynamic response to external disturbing influences, include the so-called motor tones (vertical and horizontal (lateral) oscillations of engines on elastic pylons). A new type of flutter has appeared – pylon, which for some aircraft determines the critical flutter speed of the aircraft as a whole. The main reason for this phenomenon is the low oscillation damping of the engine on the pylon under the wing. Therefore, research aimed at modernizing the engine mounting points on the pylon in order to reduce the level of elastic oscillations during aircraft operation seems relevant. One of the possible ways to solve this problem is to use the concept of a freed engine, when the engine attachment points to the pylon are modernized, providing more effective damping of engine oscillations. In order to confirm the possibility of practical implementation of these solutions, corresponding experimental studies were carried out on an experimental setup developed by the authors. A design of engine mounting units has been developed that allows specified displacements of the engine relative to the pylon during forced elastic oscillations of the system, which includes a hinged suspension, installation of additional elastic elements and hydraulic dampers.The article presents the results of studies of the influence of elastic-dissipative parameters (partial frequency of natural oscillations and partial decrement of oscillations) of an engine mount on an elastic pylon on the dynamic characteristics of the dynamic system “wing model – elastic pylon – engine”. It is shown that by introducing specially designed engine suspension units on pylons, it is possible to significantly change the dynamic characteristics (frequencies and amplitudes of natural oscillations) of the elastic system as a whole. Thus, the amplitudes of oscillations of the engine’s center of mass in the region of motor tones decrease by 3...7 times during forced harmonic oscillations.https://avia.mstuca.ru/jour/article/view/2339elastic-dissipative parameters of the suspensiondynamic characteristicsfrequency and amplitude of natural oscillationsamplitude-frequency characteristics |
| spellingShingle | Y. V. Petrov M. V. Semakova V. G. Ugreninov Experimental studies of the influence of elastic-dissipative parameters of engine mounting units on the dynamic characteristics of the “wing model – elastic pylon – engine” system Научный вестник МГТУ ГА elastic-dissipative parameters of the suspension dynamic characteristics frequency and amplitude of natural oscillations amplitude-frequency characteristics |
| title | Experimental studies of the influence of elastic-dissipative parameters of engine mounting units on the dynamic characteristics of the “wing model – elastic pylon – engine” system |
| title_full | Experimental studies of the influence of elastic-dissipative parameters of engine mounting units on the dynamic characteristics of the “wing model – elastic pylon – engine” system |
| title_fullStr | Experimental studies of the influence of elastic-dissipative parameters of engine mounting units on the dynamic characteristics of the “wing model – elastic pylon – engine” system |
| title_full_unstemmed | Experimental studies of the influence of elastic-dissipative parameters of engine mounting units on the dynamic characteristics of the “wing model – elastic pylon – engine” system |
| title_short | Experimental studies of the influence of elastic-dissipative parameters of engine mounting units on the dynamic characteristics of the “wing model – elastic pylon – engine” system |
| title_sort | experimental studies of the influence of elastic dissipative parameters of engine mounting units on the dynamic characteristics of the wing model elastic pylon engine system |
| topic | elastic-dissipative parameters of the suspension dynamic characteristics frequency and amplitude of natural oscillations amplitude-frequency characteristics |
| url | https://avia.mstuca.ru/jour/article/view/2339 |
| work_keys_str_mv | AT yvpetrov experimentalstudiesoftheinfluenceofelasticdissipativeparametersofenginemountingunitsonthedynamiccharacteristicsofthewingmodelelasticpylonenginesystem AT mvsemakova experimentalstudiesoftheinfluenceofelasticdissipativeparametersofenginemountingunitsonthedynamiccharacteristicsofthewingmodelelasticpylonenginesystem AT vgugreninov experimentalstudiesoftheinfluenceofelasticdissipativeparametersofenginemountingunitsonthedynamiccharacteristicsofthewingmodelelasticpylonenginesystem |