基于最优控制解的理论 ,建立了引入先验约束条件的混凝土重力坝动态参数识别模型 ,提出了求解该模型的约束变尺度方法。以某大坝空库情形为例 ,在振动观测数据不完全的条件下 ,对动态材料参数识别方法进行考察。识别结果表明 ,约束变尺度方法不仅具有较高的计算精度和良好的数值稳定性 ,并且具有一定的抑制数据噪音的能力。在只有一阶圆频率和几个固定点处有一阶振型观测数据的情况下 ,可以可靠地识别出坝体混凝土和基础岩石的动弹性模量。从而为识别混凝土坝体和岩石基础弹性常数提供了一条新的有效途径 Based on the theory of optimal control solution, a dynamic parameter identification model of concrete gravity dam with prior constraint is established, and a constrained scaling method is proposed to solve this model. Taking a dam empty reservoir as an example, under the condition of incomplete vibration observation data, the method of dynamic material parameter identification is investigated. The recognition results show that the constrained variable scale method not only has high computational accuracy and good numerical stability, but also has a certain ability to suppress data noise. In the case of first-order circular frequencies and first-order mode shapes observed at several fixed points, the dynamic elastic modulus of dam concrete and base rock can be reliably identified. Thus providing a new effective way to identify concrete dam and rock foundation elastic constants