Numerical Modeling and Investigation on Aerodynamic Noise Characteristics of Pantographs in High-Speed Trains
المؤلفون المشاركون
المصدر
العدد
المجلد 2018، العدد 2018 (31 ديسمبر/كانون الأول 2018)، ص ص. 1-12، 12ص.
الناشر
Hindawi Publishing Corporation
تاريخ النشر
2018-03-20
دولة النشر
مصر
عدد الصفحات
12
التخصصات الرئيسية
الملخص EN
Pantographs are important devices on high-speed trains.
When a train runs at a high speed, concave and convex parts of the train cause serious airflow disturbances and result in flow separation, eddy shedding, and breakdown.
A strong fluctuation pressure field will be caused and transformed into aerodynamic noises.
When high-speed trains reach 300 km/h, aerodynamic noises become the main noise source.
Aerodynamic noises of pantographs occupy a large proportion in far-field aerodynamic noises of the whole train.
Therefore, the problem of aerodynamic noises for pantographs is outstanding among many aerodynamics problems.
This paper applies Detached Eddy Simulation (DES) to conducting numerical simulations of flow fields around pantographs of high-speed trains which run in the open air.
Time-domain characteristics, frequency-domain characteristics, and unsteady flow fields of aerodynamic noises for pantographs are obtained.
The acoustic boundary element method is used to study noise radiation characteristics of pantographs.
Results indicate that eddies with different rotation directions and different scales are in regions such as pantograph heads, hinge joints, bottom frames, and insulators, while larger eddies are on pantograph heads and bottom frames.
These eddies affect fluctuation pressures of pantographs to form aerodynamic noise sources.
Slide plates, pantograph heads, balance rods, insulators, bottom frames, and push rods are the main aerodynamic noise source of pantographs.
Radiated energies of pantographs are mainly in mid-frequency and high-frequency bands.
In high-frequency bands, the far-field aerodynamic noise of pantographs is mainly contributed by the pantograph head.
Single-frequency noises are in the far-field aerodynamic noise of pantographs, where main frequencies are 293 Hz, 586 Hz, 880 Hz, and 1173 Hz.
The farther the observed point is from the noise source, the faster the sound pressure attenuation will be.
When the distance of two adjacent observed points is increased by double, the attenuation amplitude of sound pressure levels for pantographs is around 6.6 dB.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Sun, Xiaoqi& Xiao, Han. 2018. Numerical Modeling and Investigation on Aerodynamic Noise Characteristics of Pantographs in High-Speed Trains. Complexity،Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1135547
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Sun, Xiaoqi& Xiao, Han. Numerical Modeling and Investigation on Aerodynamic Noise Characteristics of Pantographs in High-Speed Trains. Complexity No. 2018 (2018), pp.1-12.
https://search.emarefa.net/detail/BIM-1135547
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Sun, Xiaoqi& Xiao, Han. Numerical Modeling and Investigation on Aerodynamic Noise Characteristics of Pantographs in High-Speed Trains. Complexity. 2018. Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1135547
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-1135547
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر