用强迫振动速度响应曲线分析地基阻尼比
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(1 中国兵器工业第五设计研究院，北京 100053； 2 北京东方振动和噪声技术研究所，北京 100085)［摘要］当地基阻尼比较大，位移及加速度幅频响应曲线峰点不明显或消失时，点峰法及多峰法均不能求阻尼比。但是只要速度曲线尚有峰点，就可用点峰法导出阻尼比公式，并利用变换，将其与位移、加速度曲线求阻尼比之间的关系互相沟通，并得出参振质量及地基刚度。［关键词］点峰法；多峰法；速度曲线；地基阻尼比；变换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图1(b)速度曲线现由应怀樵给出。②由吴邦达导出、更正并变换。作者简介：吴邦达，教授级高工，Email:wubangda@sina.com.cn参考文献［1］[ZK(#〗GB/T50269—97地基动力特性测试规范［S］.北京：中国计划出版社，1998.［2］吴邦达.用多峰法分析动力基础地基阻尼比［C］∥现代振动与噪声技术(第5卷).北京：航空工业出版社，2007:510-513.
［3］黄浩华，戴君武，战松海.5m×5m振动台基础动力分析与实测［C］∥现代振动与噪声技术(第5卷).北京：航空工业出版社，2007:94-115.
