Development of engineering methods for structure-borne noise specification and quantification in aircraft and rotorcraft cabins

开发飞机和旋翼飞机机舱中结构噪声规范和量化的工程方法

• 批准号: 514874-2017
• 负责人: Doutres, Olivier
• 金额: $ 11.66万
• 依托单位: École de technologie supérieure
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618538
• 关键词: Development; engineering; methods; structure; borne

Aircraft and rotorcraft manufacturers integrate a high number of systems which are responsible for tonal vibrations such as (i) aircraft engines generating low frequency tonal components at Fan and Engines core rotor frequency, (ii) rotorcraft main rotor transmission generating structure-borne mid frequency tones at gear mesh frequencies, (iii) hydraulic system generating mid to high frequency tonal components and (iv) electric components generating high frequency harmonics. These vibrations propagate into the aircraft/rotorcraft structure and are transmitted to the interior trim panels that, in turn, radiate noise into the cabin. This noise, referred to as SBN, is known to be a major source of aircraft/rotorcraft interior noise that affects passengers comfort, increases crew member noise exposure level and decreases their communication ability. However, these annoying SBN could be mitigated if vibrating systems, receiving structures and interfaces between them were well specified and designed during the product development phase. The overall objective of this project is to develop and validate engineering methods for predicting SBN generated in aircraft/rotorcraft cabins by integrated vibrating systems. These methods will be based on existing SBN methods (i.e., Frequency Based Substructuring and Component-based TPA) which are not widely spread in the mechanical engineering community because they are difficult to apply in practice. The objective of this project is in consequence to investigate, extend and validate these methods specifically for aerospace integrated systems and structures focusing on the degree of complexity required for the targeted accuracy on the SBN prediction. The three industrial partners will be provided with an engineering tool together with the relevant methodologies and metrics dedicated to their SBN challenges. This knowledge toolbox will allow them a better engineering integration of SBN design challenges all along the product design cycle.

飞机和旋翼机制造商集成了大量负责音调振动的系统，例如(I)飞机发动机在风扇和发动机核心转子频率产生低频音调分量，(Ii)旋翼飞机主转子变速器在齿轮啮合频率产生结构承载的中频音调，(Iii)液压系统产生中高频音调分量和(Iv)产生高频谐波的电气部件。这些振动传播到飞机/旋翼机结构，并传递到内部装饰板，进而向机舱辐射噪音。这种被称为SBN的噪声是飞机/旋翼机内部噪声的主要来源，它会影响乘客的舒适性，增加机组人员的噪声暴露水平，并降低他们的沟通能力。然而，如果在产品开发阶段很好地指定和设计振动系统、接收结构和它们之间的接口，这些恼人的SBN可以得到缓解。该项目的总体目标是开发和验证工程方法，以预测通过集成振动系统在飞机/旋翼机舱内产生的SBN。这些方法将基于现有的SBN方法(即基于频率的子结构和基于组件的TPA)，由于难以在实践中应用，这些方法在机械工程界并未广泛推广。因此，本项目的目标是专门为航天综合系统和结构调查、推广和验证这些方法，重点是SBN预测的目标准确性所需的复杂程度。这三个行业合作伙伴将获得一个工程工具，以及专门用于他们的SBN挑战的相关方法和指标。该知识工具箱将使他们能够在整个产品设计周期中更好地整合SBN设计挑战。