Thus the displacement amplitude of even the loudest sound is extremely small . 這樣,即使是最強聲音的位移振幅,也還是非常小的。
The notable torsion effects of the surface ground motion above the alluvial valley are illustrated and the torsion effects become stronger as the frequency of the incidence is higher . ( 4 ) antiplane surface motion of the underground circular soft inclusion and the underground homogeneous soft interlayer is investigated in this paper . the results indicate : surface displacement amplitudes just above the soft inclusion of small depth - to - width ratio is amplified and soft interlayer of small depth - to - thickness ratio is amplified to a certain degree , and moreover , the latter is lower limit of the former 結(jié)果表明:垂直入射時,小深寬比軟夾塞上方地表位移幅值有較大的放大,小深厚比軟夾層的地表位移幅值也有一定的放大,且后者為前者的下限;波接近掠入射時,軟夾塞正上方地表點和軟夾層的中國地震局工程力學研究所碩士學位論文一地表位移幅值都沒有放大,而軟夾塞迎波面一側(cè)地表點的位移幅值會有一定的放大;軟夾塞上方的地表位移運動有較強烈的扭轉(zhuǎn)效應(yīng),且此扭轉(zhuǎn)效應(yīng)隨入射波頻率的增高而增強。
( 5 ) antiplane surface motion of underground circular hard inclusion and underground homogeneous hard interlayer is investigated . the results indicate : the surface displacement amplitudes just above the underground circular hard inclusion is reduced , while surface motion on both two sides are significantly amplified when the vertical waves are excited . the surface motion on the side o 結(jié)果表明:波垂直入射時硬夾塞上方地表位移幅值處于減小狀態(tài),但在兩側(cè)出現(xiàn)放大,波斜入射時硬夾塞的迎波一側(cè)地表易出現(xiàn)一定的放大:硬夾層上的地表位移幅值在多數(shù)情況下呈現(xiàn)一種放大作用,對深厚比較大的硬夾層放大作用易出現(xiàn)在低頻:地下硬夾塞上的地表運動沒有明顯的扭轉(zhuǎn)效應(yīng)。
Through the research , following achievements have been made : ( 1 ) a detailed experimented study has been carried out to investigate the performance of the sma incorporated friction dampers . the effects of displacement amplitude and frequency are taken into account in experiments . good agreement between theoretical and experimental results is obtained 通過研究主要取得如下成果: ( 1 )首次進行了sma復合摩擦阻尼器的性能試驗研究,根據(jù)試驗結(jié)果分析了位移幅值、加載頻率等對阻尼器的等效剛度、單位循環(huán)耗能和等效阻尼比的影響,并與理論分析結(jié)果進行了對比分析,兩者吻合較好。
After that , antiplane surface motion features of the shallow alluvial valley of small depth - to - width ratio are investigated in details . the results indicate that surface displacement amplitudes of alluvial valley will not reduce when the alluvial valley become shallow . the maximum amplitudes will move to high frequency with depth - to - width ratio becoming small 在此基礎(chǔ)上,對小深寬比的淺圓弧型沉積盆地出平面地表運動特征做了較深入的研究,結(jié)果表明盆地地表位移幅值不會因變淺而減小,最大反應(yīng)會隨著盆地深寬比的減小而向高頻移動。