| 1. | Research on sound radiation modes
对声辐射模态的讨论 |
| 2. | Because radiation modes are orthogonal each other , the corresponding sound power of each order radiation mode is completely independent
声辐射模态相互正交，每一阶声辐射模态下的声功率相互独立。 |
| 3. | That is to say , in order to measure the adjoint coefficients of sound radiation modes , we should design the particular shape of error sensor
因此我们必须设计出误差传感器来测量所需控制的声辐射模态伴随系数。 |
| 4. | Based on the acoustic radiation mode analysis , the transfer matrix relating the pressure at every field point to normal component of surface velocity is formed
摘要基于声辐射模态分析，建立了外部场压和结构表面振动速度之间关系的传递矩阵。 |
| 5. | The total sound radiation power can be reduced by counteracting the adjoint coefficients of sound radiation modes of the first n radiation modes
声辐射模态伴随系数与对应的辐射声功率成正比。通过抵消前n阶声辐射模态伴随系数，就可以使总声功率降低。 |
| 6. | People are interested in the study of asac system based on the radiation modes of radiation structure in recent years , and the system can reduce sound radiation power by controlling radiation modes
其中以声辐射模态为基础的asac系统是近年来的研究热点。这种方法是通过声辐射模态的抑制来使结构的辐射声功率降低。 |
| 7. | Modal analysis of k5206nm compressor block is done , and the acoustic radiation modal parameters are calculated , then the acoustic radiation properties of the compressor block can be obtained , which provide the basis for the low noise compressor block design
对k5206nm压缩机机体进行了模态分析和声辐射模态参数计算，获得了机体的声辐射特性，从而为机体的低噪声设计提供了依据。 |
| 8. | Using finite element and boundary element method , a modal analysis model of complex structural acoustic radiation in light fluid is proposed for computing modal acoustic radiation frequency , farfield sound pressure , modal radiated acoustic power and acoustic radiation efficiency
摘要采用有限元和边界元方法建立了轻流体介质中复杂结构振动声辐射的模态分析模型，可计算结构的声辐射模态频率、模态场点声压、模态辐射声功率和声辐射效率等声场特性参数。 |
| 9. | Abstract : it is observed that the sommerfeld ' s formula for a progressive spherical wave is not covariant with respectro the rotation of the coordinate system . it contains complex partial waves that are not physical . the standing wave representation of the same formula is shown to be covariant and physical . it is applied to solve the boundary value problem of fiber optics . the radiation modes as well as the guided normal modes are obtained in closed forms . the intensity distribution in various modes is obtained . it is remarked that the mode of critical refraction is missing
文摘:说明了球面行波的索末菲公式在坐标转动下不协变.证明了球面波的驻波表示是协变的，因而是一个物理的关系式，故适用于圆柱坐标中各类波动方程的定解问题.作为一个例，应用于光纤光学，导出了受导简正模和辐射模的表达式，以及各模式的强度分布 |
| 10. | Radiation modes are dependent on the radiator ' s geometry shape and vibration frequency , but are not relative to the material characteristic and the border condition of the radiator . further more , the radiation efficiency of the radiation modes falls off very rapidly with the increase of modes order at low frequency . the adjoint coefficient of sound radiation modes is proportional to the corresponding sound radiation power
声辐射模态由辐射体的几何形状和振动频率决定，与辐射体本身的材料特性以及边界条件无关；特别是在中低频率时，声辐射模态对应的辐射效率随模态阶数的增加而迅速降低。 |
