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该文针对局部子结构为修正对象的情况,提出只利用整体结构中局部子结构部分的脉冲响应即可以精确修正子结构模型的约束子结构方法。它是利用子结构位置的脉冲响应,计算需要施加在结构边界的支座反力,构造出约束子结构的脉冲响应,然后由特征系统实现法(ERA)方法识别出构造响应的模态,进而修正子结构。约束子结构是指在子结构边界施加虚拟支座后的独立结构,它含有单元少而更有利于模型修正。通过修正约束子结构的单元刚度,间接修正整体结构中的子结构,不但可剔除整体结构其他部分的误差对子结构模型修正的影响,提高修正精度,而且可提高计算效率。该文以十跨桁架模型为例,分别利用子结构位置的位移脉冲、速度脉冲和加速度脉冲构造约束子结构并修正子结构,验证了方法的有效性,并分析了噪声对方法的影响。
Aiming at the situation that the local substructure is the object of amendment, this paper proposes a method to correct the constraint substructure of the substructure model by using only the impulse response of the partial substructure in the whole structure. It uses the impulse response of the substructure position to calculate the reaction force of the abutment to be applied to the boundary of the structure and construct the impulse response of the constrained substructure. The ERA method then identifies the modes of the structural response, and then Modifier substructure. Constraint structure refers to the independent structure after the virtual support is applied on the boundary of the substructure, which contains fewer units and is more conducive to model correction. By correcting the unit stiffness of the constrained sub-structure and indirectly correcting the sub-structure in the whole structure, the influence of the errors of other parts of the whole structure on the sub-structure model correction can be eliminated, the correction accuracy can be improved, and the computational efficiency can be improved. Taking the 10-span truss model as an example, this paper constructs the constrained substructure using the displacement pulse, velocity pulse and acceleration pulse of sub-structure respectively and modifies the substructure. The effectiveness of the method is verified and the influence of noise on the method is analyzed.