Stainless-steel passenger coaches are the most operated passenger trains in Indonesia, which are manufactured by the Indonesian railway industry, (PT. INKA), from its first launch to the last generation of trains. PT. INKA still keeps innovating to improve the performance of these trains. Nowadays, this passenger coach is being developed to reach a speed of more than 120 km/hour, while keeping the stability, ride quality index, and ride comfort index during operation. This new train would be called a stainless-steel new generation (SS-NG) passenger coach. To reach the target, one of the methods is redesigning the old bogie structure of the stainless-steel passenger coach. The purpose of this research is to design a new bogie for the SS-NG passenger coach and analyze its dynamics during operation at high-speed using multibody simulation. The result was then compared to the existing passenger coach (SS-2018) which was structured by the old bogie one. Sperling’s method was utilized for evaluating the ride comfort index of all designed trains. As a result, the SS-NG with a new bogie design showed stable operation and gave an acceptable ride comfort index based on Sperling’s method even though travels at 240 Km/h in speed. The results will be important for improving the performance of any train, especially the SS-NG passenger coach which will be fabricated by PT. INKA.

Kereta penumpang stainless steel merupakan jenis kereta yang paling banyak beroperasi di Indonesia. Hal ini karena kereta ini memberikan fasilitas lengkap, berbiaya ekonomis, dan menawarkan jam operasi yang lebih banyak. Kereta penumpang stainless steel difabrikasi oleh PT. Industri Kereta Api (PT. INKA) dari generasi pertama hingga sekarang, dan terus mengalami perkembangan inovasi. Kereta ini sedang dikembangkan agar mencapai kecepatan lebih dari 120 Km/jam dengan tetap menjaga tingkat keamanan dan kenyamanan, serta disebut sebagai kereta penumpang stainless steel new generation (SS-NG). Untuk mencapai hal tersebut, salah satu caranya adalah dengan mendesain ulang struktur bogie kereta. Penelitian ini bertujuan untuk menganalisis desain bogie pada rangkaian kereta SS-NG dengan metode simulasi system multibody dynamic untuk mengkaji dinamika kereta serta membandingkannya dengan dinamika kereta existing, yakni SS-2018. Hasil simulasi menunjukkan bahwa desain bogie kereta SS-NG memberikan tingat kenyamanan pada arah vertikal dan lateral sesuai dengan Sperling comfort index pada pusat carbody, pusat bogie depan dan belakang saat kereta beroperasi pada kecepatan 240 Km/jam.