ANALYSIS OF SOUND CHARACTERISTICS FROM OPERATIONAL CONDITIONS IN INTERNAL COMBUSTION ENGINE (ICE) AND ELECTRIC VEHICLE (EV) TACTICAL VEHICLE TYPES

• Main Author: Fitriadi Rakhim, Yogi
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/73147
• Institution: Institut Teknologi Bandung

This study aims to analyze the sound characteristics in tactical vehicles of Internal Combustion Engine (ICE) and Electric Vehicle (EV) types under specific operational conditions. In the context of tactical vehicle development, a good understanding of sound characteristics is crucial to enhance civilian driver comfort and acoustic performance of the vehicles. The method employed in this research involves evaluating objective frequency parameters using Fast Fourier Transform (FFT) and spectrogram analysis. The study compares the sound characteristics of the ICE and EV models of the Morino 4x4 tactical vehicle, along with the Toyota Hilux. Sound data was collected during both static and dynamic conditions of the vehicles. The evaluation focused on analyzing the Sound Pressure Level (SPL) using FFT and spectrogram analysis to observe the differences in SPL range and levels between the ICE and EV vehicles. The research findings indicate that the EV model of the Morino 4x4 tactical vehicle exhibits a wider and higher SPL range compared to the ICE model and Toyota Hilux under static conditions. Conversely, under dynamic conditions, the ICE model of the Morino 4x4 tactical vehicle demonstrates a broader and higher SPL range compared to the EV model and Toyota Hilux. A significant difference of approximately 3.4 dB(A) in average SPL and 6.04 dB(A) in maximum SPL was observed between the EV and ICE vehicle types. Furthermore, sound event identification revealed similarities among all three vehicle types in various audible aspects inside the cabin. Sounds such as starter, powertrain, electric motor, HVAC, acceleration, deceleration, shifting gear, road bumps, squeaks & rattles, rolling noise, and aerodynamic noise were detected in all vehicles. However, the frequency characteristics of the sounds differed among the vehicles, with the Toyota Hilux exhibiting dominant frequencies in the low mid-range, the EV tactical vehicle in the mid-range, and the ICE tactical vehicle in the bass range.