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- 저자 : Shuilong He (검색결과 2 건)
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Shuilong He,Keren Chen,Enyong Xu,Mingsong Ye,Yanxue Wang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
This article introduces a rigid-flexible coupling calculation model based on a multi-platform integrated method to analyze and optimize the cab comfort of commercial vehicles. A 12 degree-of-freedom (DOF) vibration model is first derived by Lagrange's equations. Further, a refined cab with flexible body, bushing, and nonlinear damping is constructed and connected with the vibration model to form a novel dynamics model. Next, the coupled suspend parameters on cab vibration are explored with a Latin hypercube method, which concluded that the front suspend is the most significant component for cab comfort. The multi-objective genetic algorithm (MOGA) and multiverse optimizer (MVO) is then applied to obtain the optimal suspend parameters for ideal cab comfort. Finally, the optimization is verified via simulation and experiment, illustrating that the coupling calculation model and multi-platform integrated method can provide an effective approach to excavate the optimal solution for the optimization of high-complexity engineering problems.
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Effect of ages and season temperatures on bi-surface shear behavior of HESUHPC-NSC composite
Yang Zhang,Yanping Zhu,Pengfei Ma,Shuilong He,Xudong Shao Techno-Press 2023 Advances in concrete construction Vol.15 No.6
Ultra-high-performance concrete (UHPC) has become an attractive cast-in-place repairing material for existing engineering structures. The present study aims to investigate age-dependent high-early-strength UHPC (HESUHPC) material properties (i.e., compressive strength, elastic modulus, flexural strength, and tensile strength) as well as interfacial shear properties of HESUHPC-normal strength concrete (NSC) composites cured at different season temperatures (i.e., summer, autumn, and winter). The typical temperatures were kept for at least seven days in different seasons from weather forecasting to guarantee an approximately consistent curing and testing condition (i.e., temperature and relative humidity) for specimens at different ages. The HESUHPC material properties are tested through standardized testing methods, and the interfacial bond performance is tested through a bi-surface shear testing method. The test results quantify the positive development of HESUHPC material properties at the early age, and the increasing amplitude decreases from summer to winter. Three-day mechanical properties in winter (with the lowest curing temperature) still gain more than 60% of the 28-day mechanical properties, and the impact of season temperatures becomes small at the later age. The HESUHPC shrinkage mainly occurs at the early age, and the final shrinkage value is not significant. The HESUHPC-NSC interface exhibits sound shear performance, the interface in most specimens does not fail, and most interfacial shear strengths are higher than the NSC-NSC composite. The HESUHPC-NSC composites at the shear failure do not exhibit a large relative slip and present a significant brittleness at the failure. The typical failures are characterized by thin-layer NSC debonding near the interface, and NSC pure shear failure. Two load-slip development patterns, and two types of main crack location are identified for the HESUHPC-NSC composites tested in different ages and seasons. In addition, shear capacity of the HESUHPC-NSC composite develops rapidly at the early age, and the increasing amplitude decreases as the season temperature decreases. This study will promote the HESUHPC application in practical engineering as a cast-in-place repairing material subjected to different natural environments.
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