臺灣博碩士論文加值系統

在先前的研究中已經針對聲源法作過討論,而事實證明聲源法的確在
聲場的預估上有著良好的預估結果.但是卻衍生出一個問題:"如果在近場
的量測面上有些許量測上的誤差存在,那麼利用聲源法預估遠場時會有多
大的誤差發生呢?"吾人將針對這個問題進行一系列的數值計算.藉由在近
場量測面上給定某些誤差,然後再來計算遠場發生多大的誤差.結果指出,
即使在近場有少許量測誤差存在,吾人利用聲源法預估遠場時依然可以有
不錯的預估值. 另外,為掌握住聲源法分析的特性,吾人將在文章中針
對近似聲源法的影響參數進行討論.

Alternative acoustic source methods were introduced in the
earlier studies.It proves that source methods give good
estimations. However a question arises:"Suppose there are some
errors in the nearfield measurement on the boundary, what will
be the errors in the estimation in the farfield by these source
methods?" A numerical simulation is performed by setting
possible errors in the nearfield measurement, then the errors in
the farfield are evaluated. The results indicate that the source
methods give fair estimations in the farfield, even with
possible errors in the nearfield measurement. Besides, in order
to capture analytical characteristics of source methods,we will
discuss the influence parameters of similar source method(SSM)
in thearticle.