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Abstract

A challenge for developing acoustic metamaterials (AMMs) is considering the application of broadband muffling and load bearing capacity simultaneously. In this paper, a honeycomb based graded AMM muffler is proposed, which can widen the attenuation band and improve the structural stiffness without any external device by means of integrated design. Firstly, the acoustic and mechanical characteristics of the muffler unit cell are theoretically and numerically studied, and the graded muffler is designed based on these characteristics. The numerical results show that the graded muffler widens the attenuation bandwidth of the unit cell, and the simulation also shows that the graded muffler has greater stiffness than the uniform one. The stiffness driven muffler provides new possibilities for the design of advanced metamaterial with simultaneous sound insulation and load bearing performances.
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Authors and Affiliations

Gen Li
1 2
Yan Chen
1 2
Huan He
1 3 4

  1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  2. Institute of Vibration Engineering Research, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  3. MIIT Key Laboratory of Multi-Functional Lightweight Materials and Structures, Nanjing 210016, China
  4. Laboratory of Aerospace Entry, Descent and Landing Technology, Beijing 100094, China
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Abstract

Based on the exergetic sustainability indicators of polymer electrolyte membrane (PEM) fuel cell, this paper studied the effects of irreversibility of thermodynamics on some exergetic sustainability indicators of PEM fuel cell under changing operating temperature, operating pressure and current density. Some conclusions are drawn by analyzing the curves. As the operating temperature increases, the negative impact of PEM fuel cell on various parameters due to irreversibility decreases; As the operating pressure increases, the negative impact of PEM fuel cell on various parameters due to irreversibility decreases; On the other hand, with the increase of current density, the negative impact of the PEM fuel cell on various parameters due to irreversibility increases.
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Bibliography

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Authors and Affiliations

Bing Xu
1
Yan Chen
2
Zheshu Ma
1

  1. Nanjing Forestry University Coll Automobile & Traff Engn, Nanjing 210037, Jiangsu, China
  2. The 723th Institute, China Shipbuilding Industry Corporation, Yangzhou, 225001, China

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