Structural health monitoring (SHM, SMS) subsystem
Natural frequency and logarithmic decrement control
Dynamic probing techniques of buildings and structures have been used for stress-strain state control for a long time (and especially during previous 10-15 years). This method is based on measuring bulding’s natural oscillations period and decrement.
Oscillations of buildings and bridges structures may be caused by nearby construction works, traffic and other man-made processes. Thus, for high structures it is necessary to control stress-strain state changes as well as to find particular location of such changes using other methods, which enable measuring process automation.
Exceeding the acceptable level of stress-strain state under certain circumstances may lead to complete or partial destruction of the said structures and other negative consequences. There are a lot of such examples: Egyptian Bridge in St. Petersburg, Tacoma Narrows Bridge in the USA, Volgograd Bridge in Volgograd, etc.
Structural health monitoring subsystem “Natural frequency and logarithmic decrement control” enables automated control of acceptable stress-strain level excession for the purpose of accidents prevention.
Structural health monitoring (SHM) sub-system “Natural frequency and logarithmic decrement control” compares the values registered by digital sensors to the set threshold level parameters for warning and alarm notification. If the threshold values are exceeded, there will be formed corresponding signals: “Warning” or “Alarm“.