1. Vibration theory and vibro-acoustic properties for leightweight core structures

The job are about corrugate core, honeycomb which are commonly used for engineering. The typical job include: the vibro-acoustic model of corrugate core sandwich panel（Int. J. Nonlin. Mech.，2012）, the theoretical model and FEA model for the vibro-acoustic properties of finite large honeycomb sandwich panel structure(Theoretical and Applied Mechanics, 2013), established the method for square opening honeycomb sandwich panel(Journal of Xi'an Jiaotong University, 2014).

  Figure 1 corrugate sandwich panel for high speed locomotive

  Figure 2 comparison between theoretical model and experiment data

  Figure 3 sound spread for square simply supported honeycomb sandwich panel

  Figure 4 bent square honeycomb sandwich panel under internal pressure

  Figure 5 the growth rate of vibrational frequency in each orders of the sandwich panel under different internal pressure

2. Fluid-solid coupling theory and acoustical behavior for lightweight composite material

Our team mainly focus on the fluid-solid coupling problem and acoustical problem of the structures under outside complex flow field. Typical works include: the theoretical model of vibration and acoustics radiation for periodic structures under outside complex flow field （Sci. China Ser. E.，2012；AIAA. J，2012）, Fluid-solid coupling and acoustics spread prediction method for periodic structures（J. Acoust. Soc. Am.，2013）and the theoretical model of acoustics spread for sound absorption sandwich panel under outside flow field （AIAA. J，2012）.

  Figure 6  sound wave penetrate the stiffened plate under outside flow

  Figure 7 infinite sandwich panel for sound absorption material filling under outside flow

  Figure 8 (a) comparison between theory prediction and experimental data；(b) comparison between core of the porous material and hollow layer

3. Acoustics-Vibration coupling theory and sound radiation mechanism for lightweight composite material

Our job lies in research on vibration and acoustics properties of composite material sandwich panel for locomotive and civil aircraft. The works include: the analysis model of vibration and sound radiation for periodic composite material （Compos. Sci. Technol.，2013）, sound radiation theory for multi-layers anisotropy sandwich panel structures based on 3D elastic theory （J. Acoust. Soc. Am.，2013）, theoretical model of sound spread for composite material stiffened plate structures （J. Mech. Sci. Technol.）.

  Figure 9 orthogonal stiffened composite panel

  Figure 10 comparison between theory outcome and experimental data

  Figure 11 milti-layers anisotropic sandwich panel

4. Acoustics theory and optimization for lightweight porous sound-absorption materials

Our job focus on the sound absorption properties on porous metal materials, and the typical work include: reseastance theoretical model for half-opening sound-absorption foam metal and developed the multi-layer optimization method （ASME J. Vib. Acoust., 2014）, sound absorption model for sintering metal fibre based on dynamic flow resistance （Sci. China Ser. E.，2014）, sound absorption model for honeycomb porous composite materials (Chinese sience: physics, mechanics and astronomy), anisotropic analysis model for sintering metal fibre（Compos. Sci. Technol.，2014）, sound absorption model and FEA method for multiscale gap composites （Chin. Phys. Lett., 2014）.

  Figure 12 element cell of half-opening foam aluminum

  Figure 13  before and after gap optimization for half-opening foam aluminum：（a）Single band optimization；（b）band optimization

  Figure 14（a）sintering metal fibre；（b）equivalent structure for (a)

  Figure 15（a）influence of porousity gradient on sound absorption coefficient；（b）influence of diameter gradient on sound absorption coefficient

  Figure 16 multiscale sound-absorption gap

  Figure 17 acoustic impedence and spread constant for multiscale sound-absorption gap

5. An overall conclusion of our work on vibration attenuation and noise decreasing of lightweight over the last 10 years（science press，2012；Springer，2014；journal od solid mechanics，2012；applied methemetics and mechanics，2014）.

Our team has cast investigation on vibration attenuation and noise decreasing of lightweight for more than 10 years, the main work include: 1. Vibration and acoustic properties for lightweight materials, theory, experiment and simulation, 2. vibration attenuation and noise decreasing of aerospace structures, 3. Sound absorption optimization for porous materials, 4. Lightwieght design and noise decreasing design, 5. Thermal protection for lightwieght materials.

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