EVALUATION OF SPECIFIC METHODS TO DETECT CRACK AND DAMAGE OF MECHANICAL BEAM STRUCTURES USING FREE VIBRATION ANALYSIS. jcoeng [انترنت]. 25 فبراير، 2024 [وثق 17 مايو، 2024];15(04):4258-79. موجود في: https://joe.uobaghdad.edu.iq/index.php/main/article/view/3161