Honeycomb panels are widely used in aviation industry because of the properties of lightweight and high bending stiffness. However, the sound transmission loss of the panel is often low since the coincident frequency of the panel usually lies below 2 kHz. Previous results show that a single-faced honeycomb panel may acoustically perform much better, especially when it is combined with absorptive materials. This idea is further developed to overcome drawbacks. An improved concept of honeycomb panel is presented, which keeps the basic properties of a honeycomb panel, while the coincident phenomenon in audible frequency is avoided. The theoretical consideration behind this design is discussed. The idea is then tested experimentally. The weighted apparent sound reduction index of the modified honeycomb panel is 4 dB higher than an ordinary honeycomb panel with similar surface density.
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