| Author Name | Affiliation | | Jingyong Han | School of Astronautics, Harbin Institute of Technology, Harbin 150001, China
China Academy of Launch Vehicle Technology, Beijing 100076, China | | Kaiping Yu | School of Astronautics, Harbin Institute of Technology, Harbin 150001, China | | Haiyang Song | School of Astronautics, Harbin Institute of Technology, Harbin 150001, China |
|
| Abstract: |
| Sandwich panels are increasingly used in the aerospace industry in recent years. Aircrafts are always affected by the thermal and noise environment during their life in service. Analytical studies on the sound vibration response of the sandwich panels with flexible core under thermal environments are performed in the paper. Governing equations are obtained by applying Hamilton’s principle with both anti-symmetric and symmetric motions taken into consideration. Natural frequencies, mode shape and critical temperature are acquired with thermal stresses considered. The forced vibration response and sound radiation are obtained based on the mode superposition principle and the Rayleigh integral. The model is validated compared with the results in literature. Natural frequencies for both anti-symmetric and symmetric motions decrease with temperature rise. Lower order flexural mode and higher-order dilatational mode are sensitive to the temperature change. Symmetric motion induces the anti-resonance frequencies move to the low frequency range. The peaks of sound vibration response remove to the low frequency range as the temperature rise and the amplitude of the peaks decrease due to the enhanced damping.The proposed model may serve as an effective guideline for the application of sandwich panels in thermal environments. |
| Key words: sandwich panels symmetric motion vibration sound radiation thermal environment |
| DOI：10.11916/j.issn.1005-9113.16055 |
| Clc Number:TB532 |
| Fund: |
|
| Descriptions in Chinese: |
| 软芯夹层板热环境下声振特性研究 韩敬永1,2，于开平1，宋海洋1，李向阳1 （1．哈尔滨工业大学 航天学院，哈尔滨 150001； 2．中国运载火箭技术研究院，北京，100076） 创新点说明：同时考虑对称和反对称变形，建立了软芯夹层板热环境下声振特性分析模型，并揭示了温度及夹层板参数对结构振动特性及辐射声场声压级的影响规律。 研究目的： 考虑夹层板对称变形，针对软芯夹层板热环境下的振动和声辐射特性进行理论建模。 研究方法： 同时考虑对称和反对称变形利用哈密顿变分原理推导了热环境下夹层板的振动控制方程，通过自由振动分析得到了夹层板在热环境下的临界屈曲温度、固有频率和振型，利用模态叠加法和瑞利积分分别求得了夹层板受迫振动响应及辐射声场的声压级。分析了芯层泊松比、芯层厚度和温度载荷对夹层板固有频率的影响机理，研究了膨胀模态及温度载荷对夹层板振动和辐射声场声压级的影响。 结论： 研究发现固有频率随温度升高而降低，低阶弯曲模态和高阶膨胀模态固有频率对温度变化比较敏感；膨胀模态使得振动响应反共振频率向低频移动；随温度载荷升高响应共振峰频率向低频移动，且由于阻尼随温度升高而增大导致响应峰值降低。该理论模型可以为热环境下夹层板的应用提供一定的指导作用。 关键词：夹层板，对称运动，振动，声辐射，热环境 |
