The coconut frond cutter or coconut frond shredder is a device used to transform coconut fronds into small pieces, even turning them into a finely textured material. This study examines the design and development of a coconut-chopping machine that uses an 8 HP combustion motor. Structural analysis was performed on the machine frame by considering the maximum and minimum Von Mises Stresses. The analysis results show that the maximum Von Mises Stress in the frame is 1.670e+06 N/mm², while the minimum stress is 2.338e+04 N/mm². The displacement of the frame was observed at 2.642e-02 mm to 1.000e-30 mm. The safety factor of the frame was found to be 1.366e+02, indicating an adequate level of safety. Next, this study analyzed the shredding capacity of the machine. The analysis showed that the largest shredding capacity was 3619.30 kg/hour, which occurred at a high rotation of young fronds, producing fine shreds. Meanwhile, the smallest shredding capacity of 612.66 kg/hour occurs at low rotation of old fronds and produces coarse shreds. These results provide essential insights into using coconut shredding machines based on the rotation level and the processed material. This research contributes to the development of efficient and effective coconut processing technology.

This study explores the sound absorption behavior of polyurethane-based composites reinforced with nanocellulose derived from oil palm empty fruit bunches. Nanocellulose was synthesized through chemical and mechanical processes and incorporated into the polyurethane matrix at weight ratios of 3%, 5%, 10%, and 20%. Test specimens were prepared with standardized dimensions and evaluated using a four-microphone impedance tube system following ASTM E2611-19 to determine the frequency-dependent acoustic response across the 125–5000 Hz range. The results demonstrated a clear improvement in sound absorption in the mid-to-high frequency bands (1000–4000 Hz) as nanocellulose content increased, with peak absorption coefficients (α) exceeding 0.7 at frequencies above 3000 Hz for 5% and 10% formulations. This enhancement is attributed to increased tortuosity, airflow resistivity, and complex internal structures formed by the nanocellulose fibers. However, performance in the low-frequency range (100–1000 Hz) remained limited across all compositions, and excessive filler loading (20%) led to diminishing returns due to particle agglomeration and reduced pore connectivity. These findings suggest that oil palm empty fruit bunch nanocellulose holds substantial potential as a sustainable acoustic reinforcement material, particularly for high-frequency applications. Further structural optimization is recommended to expand its applicability for broadband noise control.