en سوخت های جایگزین Modern Powertrain (hybrid, electric, CNG, bio, ...) پژوهشي Research <span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">This study investigates the dynamic response of a lithium</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span cambria="" math="" style="font-family:">‑</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">ion battery pack subjected to environmental vibrations. Considering the widespread use of such packs in electric vehicles and energy storage systems, and the adverse effects of vibrations on their performance and safety, both numerical and experimental approaches are employed. In the numerical simulation phase, a detailed three-dimensional model of the battery pack, including all components and joints, is developed in Abaqus, and a full modal analysis is performed to extract the natural frequencies and mode shapes of the system. In the experimental phase, modal testing is conducted using an impact hammer and an accelerometer on a physical battery-pack sample under free</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span cambria="" math="" style="font-family:">‑</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">free boundary conditions to validate the simulation results. A systematic comparison between the two approaches demonstrates a good agreement, with the maximum deviation in the primary natural frequencies being less than 10%. This level of consistency confirms the accuracy and reliability of the proposed model. The developed model can serve as an effective tool during the early design stages for mechanical optimization, dynamic behavior prediction, and mitigation of vibration</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span cambria="" math="" style="font-family:">‑</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">induced failures in battery packs. The results of this study mark an important step toward improving the reliability and safety of battery packs in operational environments.</span></span></span> Lithium-Ion Battery Pack, Modal analysis, Vibration testing, Natural Frequency, Model validation, 4895 4899 http://ase.iust.ac.ir/browse.php?a_code=A-10-421-1&slc_lang=en&sid=1 Behzad Heidarpour behzad_heidarpoor@yahoo.com 180031947532846005182 180031947532846005182 No Shahid Beheshti University Abbas Rahi a_rahi@sbu.ac.ir 180031947532846005183 180031947532846005183 Yes Shahid Beheshti University Morteza Shahravi shahravim@yahoo.com 180031947532846005184 180031947532846005184 No Shahid Beheshti University