摘要
针对环境噪声声场建立及其可视化,研究了基于预测模型的声线追踪过程.首先提出线声源有约束二次离散算法,通过考虑声源周围障碍物群对线声源离散过程的影响,使离散结果能够较好地等效线声源能量的连续分布特性;其次给出了直达声线、绕射声线和反射声线追踪过程,提出针对反射路径树的二次剪枝算法来实现大范围多次反射求解,并给出剪枝判据.通过在噪声地图系统中的应用可以看出,该方法能较好地降低声源离散误差,并能在复杂城市环境下准确地对3类声线路径进行追踪.
To cope with environmental noise field establishment and visualization, a prediction model based ray-tracing process is studied. A constrained two-stage discretization algorithm for line sources is proposed, and the discrete results can reflect the energy continuous distribution characteristics of line sources by taking into account of the effects from surround barriers. In addition, the process of ray- tracing approach is discussed based on direct sound line, diffraction sound line and reflection sound line. A reflection path tree based two-stage pruning algorithm is proposed to find the solution of large- scale multiple reflections and give the pruning criteria. Finally, an application in noise mapping system is presented which indicates that the ray-tracing approach considerably reduces the errors of line sources discretization and can locate all kinds of sound lines precisely in complex urban environment.
出处
《计算机辅助设计与图形学学报》
EI
CSCD
北大核心
2014年第4期644-653,共10页
Journal of Computer-Aided Design & Computer Graphics
基金
国家自然科学基金(51175033)
北京市教委科技发展面上项目(KM201210011007)
北京市属高等学校人才强教计划资助项目(PHR201108075)
关键词
声线追踪
声场可视化
噪声地图
噪声预测
ray-tracing
sound field visualization
noise mapping
noise prediction
