• Aniket Rajendra Jadhav
• Abhinandan Admuthe

Obtaining the mode shapes in the experimental modal analysis is crucial task. It involves obtaining frequency response function (FRF), converting it into single degrees of freedom (DOF) and fitting a curve. The structure of the system whose mode shapes to be plotted is excited either by impacting a hammer or by a vibration exciter or shaker. The impact hammer test is suitable for lightly damped structure while shaker test is suitable for heavy damped structures. This is because; the impact hammer may not provide sufficient energy to excite the heavy structures. The paper consists of design and development of laboratory setup to excite the beams and plotting mode shapes of beams using commercial modal analysis software. The setup can be used for both roving impact and fixed response method and roving response and fixed excitation method. The setup is designed to excite the beams up to 50 Hz. The first two mode shapes of fixed-free beams are plotted using this test setup. Also, mode shapes of beams with different boundary conditions can also be plotted using this test setup.

experimental modal analysis; simple harmonic motion (SHM); frequency response function (FRF); nodes and antinodes.

"Development of Test Setup to Obtain Mode Shapes of Beams", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 8, page no.218-224, August-2020, Available :http://www.jetir.org/papers/JETIR2008333.pdf

"Development of Test Setup to Obtain Mode Shapes of Beams", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 8, page no. pp218-224, August-2020, Available at : http://www.jetir.org/papers/JETIR2008333.pdf