舰艇机械设备在瞬态冲击作用下的动力学模型可靠性研究

Recently numerical experiments on shock dynamic of ship equipments are in widely application, but the accuracy of finite element model and reliability of the predicted shock response obsesses the analysts. In this subject, the research method to process finite-element model updating and validation for ship machine equipments subjected to transient shock loading is to investigate.The validation criterion for machine equipment model updating will definitude, with considering the shock dynamic response characteristics of ship equipments.The paramatric finite-element model for linear and nonlinear substructure in equipments are to found, and the parameters identification methods for the typical substructures will be researched. The whole model of equipment are updated with experimental test data by hierarchical model validation.Considering the uncertain factors in the ship equipment transient shock response, the reliability of whole model to predict shock response is to assess. Then, taking a typical ship machine equipment as object, the shock response mechanism in the inner structure and accessories is to analyzed, in order to provide technical support for shock resistance design and protection of ship machine equipments.

随着舰艇设备抗冲击研究的深入，舰艇设备冲击动力学有限元分析受到越来越多的重视，但是目前还无法评估和优化有限元冲击问题的模拟精度和动响应预报可靠性。本项目拟开展舰艇机械设备在瞬态冲击作用下的结构动力学模型可靠性基础研究，分析舰艇机械设备冲击动力学响应特征，确定机械设备结构模型准确性的评判衡准，研究建立舰艇机械设备典型子结构的参数有限元模型，开展机械设备线性及非线性子结构模型参数辨识，并在试验数据的基础上采用分层模型确认的方法对设备整机有限元模型进行修正；充分考虑水下爆炸瞬态冲击作用下舰艇机械设备冲击动响应的不确定性因素，对机械设备整机有限元模型冲击动响应预报的可靠性进行评估，并深入探讨典型机械设备在冲击作用下的响应机理，为舰艇机械设备抗冲击设计和防护提供技术支撑。

舰艇机械设备抗冲击性能关系到乃至全舰生命力和作战能力，因此设备冲击动力学分析受到越来越多的重视。项目提出了舰用机械设备冲击响应数值计算评估体系，可用于设备抗冲击能力评估和优化设计。目前尚未有系统的舰艇设备冲击数值体系研究，本项目为建立起有效、合理的评估体系，利用理论分析、数值建模、冲击试验等几个方面的手段，分别针对典型子结构参数化模型、冲击响应离散传递矩阵法、典型设备冲击响应传递机理开展系统研究，并最终得到经过试验验证的舰艇机械设备冲击动力学数值分析方法，解决了国内舰艇设备抗冲击能力数值评估手段未经有效验证的问题，将会对海军装备研制起到技术支撑作用。