用強迫振動速度響應(yīng)曲線分析地基阻尼比
吳邦達1，應(yīng)懷樵2
- 摘 要
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(1 中國兵器工業(yè)第五設(shè)計研究院，北京 100053； 2 北京東方振動和噪聲技術(shù)研究所，北京 100085)［摘要］當(dāng)?shù)鼗枘岜容^大，位移及加速度幅頻響應(yīng)曲線峰點不明顯或消失時，點峰法及多峰法均不能求阻尼比。但是只要速度曲線尚有峰點，就可用點峰法導(dǎo)出阻尼比公式，并利用變換，將其與位移、加速度曲線求阻尼比之間的關(guān)系互相溝通，并得出參振質(zhì)量及地基剛度。［關(guān)鍵詞］點峰法；多峰法；速度曲線；地基阻尼比；變換Using the velocity response curve under forced vibration to analyze subsoil damping ratioWu Bangda1, Ying Huaiqiao2(1 Fifth Design & Research Institute of China Ordnance,Beijing 100053, China;\=2 China Orient Institute of Noise & Vibration, Beijing 100085, China)Abstract:Being the peak of displacement and acceleration curves not clear or disappearance, if the subsoil damping ratio is large, it can not be obtained by using point-peak and multi-peak method. But if there is a peak in the velocity curve, it may be applied to derive the formula of subsoil damping ratio by using point-peak method. This formula may be linked up with transforming from velocity curve into displacement and acceleration curves for getting subsoil damping ratio, and participating vibrational mass and subsoil stiffness may be obtained also.Keywords:point-peak method; multi-peak method; velocity curve; subsoil damping ratio; transform①圖1(b)速度曲線現(xiàn)由應(yīng)懷樵給出。②由吳邦達導(dǎo)出、更正并變換。作者簡介：吳邦達，教授級高工，Email:wubangda@sina.com.cn參考文獻［1］[ZK(#〗GB/T50269—97地基動力特性測試規(guī)范［S］.北京：中國計劃出版社，1998.［2］吳邦達.用多峰法分析動力基礎(chǔ)地基阻尼比［C］∥現(xiàn)代振動與噪聲技術(shù)(第5卷).北京：航空工業(yè)出版社，2007:510-513.
［3］黃浩華，戴君武，戰(zhàn)松海.5m×5m振動臺基礎(chǔ)動力分析與實測［C］∥現(xiàn)代振動與噪聲技術(shù)(第5卷).北京：航空工業(yè)出版社，2007:94-115.
