Predicting the fatigue life of structures
To suppress the vibrations of structures and predict their fatigue life, it is important to understand the state of vibrations, such as natural frequencies and vibration modes. Until now, numerical analysis methods like the finite element method have been used to predict the state of vibrations. Mode analysis is used as a means to validate the predictions made by the finite element method. Mode analysis involves striking the target structure with a hammer and measuring and recording its vibrational response using a piezoelectric accelerometer, which is then analyzed using a mode analysis system. The recorded time data is converted into frequency data, known as the transfer function, using an FFT analyzer, and the mode analysis software calculates the eigenvalues (natural frequencies, natural damping ratios, and eigenvectors) through curve fitting, allowing for the visualization of behaviors at each frequency through animation.
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Transferring the measured data to the mode analysis system required many steps, but by using the mode analysis direct link software, continuous operations from measurement to analysis and animation can be easily performed. First, the defined 3D shape data is loaded and displayed. Next, the points and directions to be measured for each channel are indicated with arrows, allowing for a confirmation check before measurement. After measurement, the transfer function and time data, which include information about the measurement points and directions, are saved in a dedicated data file for the mode analysis software. Using the saved data file, analyses such as animations can be performed with the mode analysis software.
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A group of acoustic measuring instruments such as sound level meters and vibration meters, particle counters essential for cleanliness management, seismic measurement systems including earthquake meters for disaster prevention and control, and further expanding product fields centered on welfare and environmental issues, contribute to the enhancement of social welfare, safe living, and technological innovation through a long accumulation of technology and continuous challenges to new technologies.