Ride Index for Metro Coaches: Experimental Evaluation and Vehicle Dynamics Results

Instrumented field studies during oscillation trials for a new metro line and metro coaches were used to obtain Sperling’s ride index for the same. Ride index was also evaluated using a SIMPACK model. Actual coach, track, and speed information were used in the SIMPACK model. Ride index was seen to be influenced by track, velocity, and acceleration profiles. Ride indices were seen to be different in different directions (vertical, lateral and longitudinal). In the absence of track irregularities in SIMPACK, match between oscillation trail and SIMPACK results is best for longitudinal and worst for vertical ride indices.

Influence of the Primary Suspension Damping on the Ride Comfort in the Railway Vehicles

The paper features the results of a numerical study regarding the influence that the damping reduction in the primary suspension of the rail vehicle, due to the defect in a damper, has on the ride comfort. The study is based on model of rigid-flexible coupled vehicle, with seven degrees of freedom, where the carbody is modelled as an Euler-Bernoulli type equivalent beam. The results of the numerical simulations show the power spectral density of carbody vertical accceleration and the ride index comfort calculated in three carbody reference points - at the centre and against the bogies, for various cases of reduction in the damping constant of the primay suspension in the axle, compared to the reference value. As a function of velocity, due to the geometric filtering effect, the damping reduction has contrary effects upon the level of vibrations in the carbody and upon the ride comfort.

Multibody Dynamics Models of Railway Vehicle Using Adams/Rail

This research is focusing on multibody dynamics modeling data and parameter comparison. The comfort and stability of railway vehicle suspension can be measured by using Ride Index Machine and other sensors. Complete model of EMU82 from KTMB is adapted to multibody software, ADAMS/Rail. With ADAMS/Rail, the behavior and characteristic of each suspension element can be determined. The accuracy of the simulation model is verified by comparing the result of body roll angle in Adams/Rail and the actual test. As for the experiment, certain test track will be chosen and simulated in ADAMS/Rail. The selection of track is based on the design and curvature characteristic. In experiment, data of roll angle and lateral acceleration are necessary. For that purpose selected sensors such as tri-axis accelerometer and gyro will be used. The running performance of the KTMB EMU82 suspension will be gathered from the simulation.

HASIL UJI COBA DARI PENGEMBANGAN SISTEM PENGUJIAN RIDE INDEX FASILTAS UJI DINAMIKA KERETA API (FUDIKA) TEST DRIVE RESULT OF RIDE INDEX DEVELOPMENT SYSTEM AT DYNAMIC TEST FACILITY

Seiring dengan meningkatnya tuntutan masyarakat akan jasa transportasi kereta api, BPP Teknologi telah merancang dan mengembangkan sistem instrumentasi untuk pengujian dinamis kereta api yang diberi nama Fudika (Fasilitas Uji Dinamika Kereta api), salah satu kelengkapan dari uji dinamis kereta api tersebut adalah uji ride indeks yang hasilnya berkaitan langsung dengan tingkat kenyamanan penumpang diatas kereta. Pada awalnya pengujian ride indeks untuk melakukan uji pertama dan uji berkala dilakukan secara parsial dan tidak real time, disamping itu teknologi yang digunakan masih sangat sederhana. Dengan semakin banyaknya jumlah kereta yang akan diuji, baik uji pertama maupun uji berkala dan sesuai amanah Undang-Undang Nomor 23 Tahun 2007 tentang Perkertaapian, perlu dipikirkan cara pengujian yang lebih efisien dan efektif. Solusi dari persoalan sistem instrumentasi untuk pengujian ride indeks yang telah diuraikan diatas pada awalnya dilakukan secara parsial dan tidak real time selanjutnya dikembangkan menjadi sistem pengujian terpadu yang dapat menguji ride indeks 10 kereta dalam satu rangkaian pada waktu yang bersamaan secara real time. Hasil dari pengembangan pengujian secara parsial menjadi sistem pengujian terpadu telah diuji coba pada beberapa jenis kereta/gerbong pada lintasan Madiun-Walikukun dengan hasil cukup memuaskan dalam arti sistem instrumentasi Fudika tersebut bekerja dengan baik.