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• W2956056090 abstract "Rollover crashes are known as the most dangerous type of accidents throughout the world. They are associated with multi-directional velocities and accelerations which creates a complex dynamic behavior of the vehicle. Several experimental and numerical methods have been used to gain a better understanding of kinematics of the vehicle and occupants during the rollover crashes. Due to the complex nature of the rollover, any change in the initial conditions may significantly influence the rollover outcomes. The main goal of this study is to assess the effects of initial conditions on dynamic responses of the bus using a modified dolly rollover test procedure. Since the experimental rollover test is very expensive and to decrease the computational costs, the numerical model of cutaway bus was developed using lumped mass-spring-damper in PC-Crash software. First, the model was validated using the experimental data. Then, a series of simulations have been conducted with considering various initial conditions (inputs) such as initial velocity, friction of rollover surface, height of bus’s CG, and initial roll angle. The range of initial variables were selected based on Latin Hypercube Sampling (LHS) with uniform distribution. The simulation results were used to build the surrogate model using Kriging model for each rollover outcomes (outputs) including number of quarter turns, roll distance, deceleration rate, and maximum impact force. The sensitivity of the model to 400 set of input data was computed in MATLAB. The results of the sensitivity analysis indicate that the number of quarter turns and roll distance was highly affected by the initial velocity of the bus. Furthermore, the deceleration rate controlled mainly by friction and initial velocity and a negative correlation with the initial roll rate. No strong correlation between maximum impact force and any input parameters was observed. This led us to perform further research on exploring the effects of dynamic characteristics of the bus on maximum impact force." @default.
• W2956056090 created "2019-07-12" @default.
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• W2956056090 date "2019-05-31" @default.
• W2956056090 modified "2023-09-27" @default.
• W2956056090 title "Characteristic Analysis of Modified Dolly Test: A Sensitivity Study of Initial Conditions on Rollover Outcomes" @default.
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• W2956056090 doi "https://doi.org/10.1007/978-3-030-12075-7_11" @default.
• W2956056090 hasPublicationYear "2019" @default.
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