Optimization Design of Nj Shaped Guardrail Based on Collision Safety Consideration

Abstract

Cross-sectional shapes and dimensions of concrete guardrails directly influence climbing angles and directions of a car when a collision between concrete guardrail and car occurs. At the same time, contacting and climbing angles and directions influence the peak crushing force and the peak acceleration of a car body during a collision. Therefore, cross-sectional shapes and dimensions of concrete guardrails can influence the severity of injuries sustained when a collision between concrete guardrail and car occurs. In this study, the passive safety of a car body is considered in optimizing the cross-sectional dimensions of a New Jersey (NJ) concrete guardrail based on numerical simulations and surrogate model techniques. Optimal Latin hypercube design is used to get sampling points, and multi-island genetic algorithm is utilized to obtain the optimal size of NJ concrete guardrail in the optimization process. After simulating the collision between car and optimal NJ shaped guardrail, the results show that the peak acceleration of optimal results reduces significantly by 28% compared with the initial value, and the peak interface force decreases from 378.6 kN to 241.5 kN.

Radial basis function surrogate model-based optimization of guardrail post embedment depth in different soil conditions

“…Based on prior experience or practical design requirements, the designer may know what levels of errors are acceptable for a particular problem. Most studies [36][37][38][39] state that a 2% error might be desirable, a 2-10% error is acceptable, and higher than 10% error is unacceptable. It can be seen from Figures 10 and that the RMSE CV of RBFs are less than 0.3%, which demonstrated that the prediction results of the surrogates were accurate enough for engineering design.…”

“…The results presented were intended to improve the safety performance of longitudinal barriers. Hou et al 38 focused on the optimization of New Jersey concrete barriers based on safety assessments. In the same study, the efficiency of RBF-MQ (multi-quadratic) and RBF-LP (linear polynomial) methods were also investigated and the RBF-MQ method was found to yield more effective results.…”

Optimization design of corrugated beam guardrail based on RBF-MQ surrogate model and collision safety consideration

“…(4) will be unique. For constructing RBF model, some of the most commonly used basis functions [22][23][24] are: Gauss function:…”

“…Hou et al [24] used the FE model of Ford Taurus to establish the collision model between car and the NJ shaped guardrail, and optimized NJ shaped guardrail. Therefore, we used this FE model of Ford Taurus to set up the collision model between car and the corrugated beam guardrails.…”

The Correlation of Texture and the Formation of the Adiabatic Shear Band in 7XXX Aluminum Alloy during Dynamic Loading

“…In recent years, more and more high-performance extruded 7XXX series aluminum alloy profiles are applied in the car body, such as 7003 aluminum alloy, as the automotive buffer beams. erefore, the material's impact safety under high-speed impact is especially important for security reasons [1]. us, it is a major requirement to research the mechanical behavior of 7XXX series aluminum alloy under dynamic loading.…”