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为满足声源辨识中对合成冲击声的迫切需求,建立了球-板撞击的时域模型,提出一种时域快速求解方法,并进行了实验验证.首先给出一种将时域有限差分法(FDTD)和模态展开法(MEM)相结合的时域混合方法,求解板的振动方程,并解决了混合方法中MEM的模态截断和初值问题,及两种方法中阻尼的一致性问题;随后,给出了简支矩形板的冲击声计算结果,通过与FDTD方法的运算量进行对比,验证了混合方法的高效性;最后,针对自由边界下的L形板进行了实验验证.结果表明,与传统FDTD方法相比,时域混合方法在保证合成冲击声精度的前提下可将计算效率提高100至1200倍。
In order to meet the urgent need of synthesizing impact noise in sound source recognition, a time-domain model of ball-plate impact is established and a fast time-domain solution method is proposed and validated experimentally.Firstly, (FDTD) and modal expansion method (MEM), the vibration equation of the plate is solved and the modal truncation and initial value problem of MEM in the hybrid method are solved, and the damping of the two methods is consistent Then, the calculation results of impact sound of simply supported rectangular plate are given, and the computational efficiency of the FDTD method is compared to verify the efficiency of the hybrid method. Finally, an experiment is carried out on the L-shaped plate under the free boundary The results show that compared with the traditional FDTD method, the time domain hybrid method can improve the computational efficiency by 100 to 1200 times under the premise of ensuring the accuracy of synthetic impact sound.