Purlins made from galvanised steel in fertiliser warehouses have often been considered less efficient, necessitating a new purlin made using corrosion-resistant material to increase building efficiency. This study was an attempt to design a nine-metre purlin from glass-fibre-reinforced polymer (GFRP) composite material for a new fertiliser warehouse in Bontang-East Kalimantan, Indonesia. The purlin design selected in this study was the Z profile of pultruded beams from GFRP composite material that met the criteria of an efficient purlin, such as corrosion resistance, compact stacking, and ability to withstand technical loads. In particular, the Z profile becomes compact when stacked, and the GFRP material used is corrosion-resistant yet affordable. The primary materials for GFRP composites consist of long yarn glass fibre bundles for reinforcement and unsaturated polyester resin (UPR) for the matrix. Material strength modelling was based on analytical and finite element approaches. The analysis shows that the most considerable normal stress of “64.41 MPa” occurred at the two fixed end supports, while the most significant deflection of “45.9 mm” occurred at the mid-span of the purlin structure. The purlin structure was considered safe, as the strength and deflection were below the threshold. Thus, the Z profile of the pultruded purlin beams built using the GFRP composite material meets the technical criteria.
Kontes Mobil Hemat Energi (KMHE) merupakan lomba tingkat nasional yang diselenggarakan oleh Kementerian Riset dan Teknologi Indonesia yang bertujuan untuk mewadahi kreativitas mahasiswa seluruh Indonesia dalam merancang, membangun, menguji dan menyelenggarakan kompetisi mobil hemat energi yang aman dan ramah lingkungan. Peserta dari kegiatan ini adalah seluruh mahasiswa teknik di Indonesia. Penelitian ini membahas mengenai rancang bangun sistem kelistrikan mobil hemat energi yang telah sesuai regulasi KMHE 2019. Metode yang digunakan dalam penelitian ini adalah melalui simulasi Simulink MATLAB dengan menggunakan sistem kontrol Proportional Integral Derivative (PID). Hasil simulasi dengan program Simulink MATLAB R2020b menunjukkan bahwa motor BLDC dengan kecepatan putar 100-900 rpm menghasilkan torsi motor sebesar 30 Nm dan memiliki daya sekitar 960 W. Hal ini menunjukkan bahwa motor BLDC telah melebihi kebutuhan perancangan mobil listrik. Kata Kunci: KMHE, motor BLDC, ramah lingkungan, sistem kelistrikan, torsi motor.
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