Marcin Wiklo

Robust Post-Accident Reconstruction of Loading Forces

The paper presents a novel methodology for robust post-accident reconstruction of spatial and temporal characteristics of the load. The methodology is based on analysis of local structural response, and identifies an observationally equivalent load, which in a given sense optimally approximates the real load. Compared to previous researches this approach allows to use a limited number of sensors to reconstruct general dynamic loads of unknown locations, including multiple impacts and moving loads. Additionally, the problem of optimum sensor location is studied.

Design of Adaptive Structures under Random Impact Conditions

The methodology (based on the so-called Dynamic Virtual Distortion Method) of the design of structures exposed to impact loading is presented in the work. Minimization of material volume and accelerations of structural response are chosen as the objective functions for optimal design of structures adapting to impact loads. The cross-sections of structural members as well as stress levels triggering plastic-like behavior and initial prestressing are the design parameters. A general formulation of this problem, as well as particular cases, are discussed.

Impact Load Identification Based on Local Measurements

A new methodology for load identification is proposed. The global dynamic structural response is modeled using only pre-computed, time dependent, dynamic influence matrix, describing structural response to locally generated unit impulses. Then, the impact load identification procedure is based on distance minimization between the modeled and measured local dynamic responses in sensor locations. The theoretical background as well as numerical examples is presented.