Overcoming Effects from Environmental Temperature on the Natural Frequencies of Cable-strut Structures

Abstract

The changes in dynamic properties such as natural frequencies and mode shapes are used in vibration health monitoring as tools for assessing the structures health status. They are, however, also affected by environmental conditions like wind, humidity and temperature changes. Of particular importance is the change of the environmental temperature, and it is the most commonly considered environmental variable that influences the vibration health monitoring algorithms. This paper discusses how cable-strut structures can be designed such that their first natural frequency is less sensitive to the temperature changes. The optimization problem is solved by using a genetic algorithm. The level of pre-stress can be regulated to achieve the solution, particularly when a symmetric self-stress vector is chosen.

The Coupled Effect of Temperature Changes and Damage Depth on Natural Frequencies in Beam-Like Structures

“…The changes in structural frequencies are produced due to the variation in the modulus of materials under varying temperatures. Through an optimization problem, Ashwear et al [18] studied the influence of changes in environmental temperatures on a cable-strut structure's dynamic properties. They found that the first natural frequencies are less susceptible to temperature variations.…”