Liquid sloshing is becoming a major source of noise in hybrid vehicles during acceleration and braking. This noise, which is due to the movement of a liquid free surface causes annoyance to passengers and negatively affects the perceived quality of a vehicle. Sloshing phenomenon can be controlled using baffles in the tank, however a proper study is required on the configuration of baffles inside tank to effectively reduce the sloshing noise. This paper presents an experimental study on the effect of vertical baffles on sloshing noise in a partially filled rectangular tank under longitudinal periodic excitation. The experimental setup emulates different sloshing regimes namely- Planar, Non-planar and Chaotic in the tank when excited at different frequencies. Experiments were performed to understand the effect of baffle position and baffle height on the sloshing noise generation mechanism in different sloshing regimes. From the parametric studies, it is observed that the baffles are more effective in suppressing the sloshing noise when positioned close to the liquid free surface. © INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering. All rights reserved.