Noise and vibration in screw compressors considerably affect performance, dependability, and operational efficiency. This research investigates the underlying causes of elevated vibration levels in an industrial oil-flooded screw compressor using Finite Element Analysis (FEA). Excitation frequencies, including those from the drive shaft, rotors, lobe pass, and gear meshing, were computed and compared with modal analysis results to identify potential resonance conditions. Mode shapes were evaluated to understand deformation patterns contributing to vibratory behavior. Based on these observations, potential mitigation strategies—such as improved rotor support and consideration of Anti-Vibration Mount (AVM) placement—were proposed. While no direct noise measurements or AVM optimization analysis were conducted, this study enhances understanding of vibration mechanisms in screw compressors and lays the groundwork for future experimental validation and advanced NVH mitigation techniques.