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The virtual load method is studied in this paper for damage assessment of beam type structures. The main advantage of this technique is that damage assessment can be accomplished by using only the vibration modes of the current structure. A series of virtual load vectors are constructed to obtain the same pure bending states for different segments of the beam. And then the curvatures of these segments loaded in pure bending are compared to identify the damage locations and extents. It was found that the proposed method is very suitable for damage assessment of those existing beam type structures.

The PLC curriculum is highly practical. In order to achieve a good teaching effect, it must be equipped with experimental devices for a large number of practical training. The control objects of the PLC are various and it is not only unrealistic but also costly to develop a physical experiment device for each control object. Although the use of computer simulation software for virtual simulation experiments can solve the PLC experiment teaching the difficulties of physical experiments, but it does not involve hardware wiring debugging, and cannot train students’ engineering ability. Aiming at the above situation, a virtual load experiment device based on SCM is designed. With the help of the rich resources of configuration software, the realistic control model can be constructed. At the same time, the hardware interface circuit designed by the SCM is used to implement the hardware connection training. Practice has shown that this experimental device with a combination of hardware and software has significant effect on the practical teaching of PLC. [ABSTRACT FROM AUTHOR]