玄武岩纤维增强复合材料(basalt fiber-reinforced polymer,BFRP)具有优异的力学性能和可熔融再生特性,在汽车轻量化领域的应用前景广阔。针对某车型的铝制防撞装置,开展BFRP/铝混合防撞装置的多目标优化设计。首先,对BFRP层合板开展力...玄武岩纤维增强复合材料(basalt fiber-reinforced polymer,BFRP)具有优异的力学性能和可熔融再生特性,在汽车轻量化领域的应用前景广阔。针对某车型的铝制防撞装置,开展BFRP/铝混合防撞装置的多目标优化设计。首先,对BFRP层合板开展力学性能测试,并利用HyperMesh软件建立防撞装置有限元模型;其次,采用拉丁超立方抽样生成代理模型的训练样本,结合敏感度分析识别关键设计参数,并通过基于加权欧式距离的空间填充采样法来提升代理模型对响应指标的预测精度;最后,以防撞装置峰值载荷、总质量及横梁最大位移最小为优化目标,运用MOPSO(multi-objective particle swarm optimization,多目标粒子群优化)算法求解Pareto前沿,并基于熵权-TOPSIS(technique for order preference by similarity to an ideal solution,逼近理想解排序法)确定最优设计参数组合。结果显示:优化后防撞装置的峰值载荷降低了36.15%,总质量减小了12.23%,显著提升了耐撞性能并实现了轻量化目标。所提出的方法可为BFRP/铝混合防撞装置的轻量化设计提供一套系统性的解决方案。展开更多
The tire acoustic cavity resonance(TACR)noise is a significant source of the structure-borne noise inside a vehicle in the low-frequency range.This paper studies the noise dissipation effect of porous materials in red...The tire acoustic cavity resonance(TACR)noise is a significant source of the structure-borne noise inside a vehicle in the low-frequency range.This paper studies the noise dissipation effect of porous materials in reducing the TACR noise,an attempt to clarify the acoustic reduction mechanism and improve the accompanying vehicle interior noise level.A numerical model of a simplified tire cavity with rigid boundaries and acoustic excitation is established and further validated by the experiment.The effects of porous parameters on TACR frequency and sound pressure are then investigated and compared.The result reveals that the most influential material parameters are the porosity and material volume.It is also shown that the effectiveness of porous material in the mitigation of noise originates from the curliness of the material,which results in much larger acoustic impedance near the excitation position.Therefore,the sound absorption performance of the cavity attached with porous material proves to be excellent compared to that of the porous material itself.For further studying the damping effects of structural coupling,the flexible boundary of the tire tread is introduced.The results show that the porosity,material volume and structural loss factor of the tread all play important roles in reducing TACR noise.展开更多
文摘玄武岩纤维增强复合材料(basalt fiber-reinforced polymer,BFRP)具有优异的力学性能和可熔融再生特性,在汽车轻量化领域的应用前景广阔。针对某车型的铝制防撞装置,开展BFRP/铝混合防撞装置的多目标优化设计。首先,对BFRP层合板开展力学性能测试,并利用HyperMesh软件建立防撞装置有限元模型;其次,采用拉丁超立方抽样生成代理模型的训练样本,结合敏感度分析识别关键设计参数,并通过基于加权欧式距离的空间填充采样法来提升代理模型对响应指标的预测精度;最后,以防撞装置峰值载荷、总质量及横梁最大位移最小为优化目标,运用MOPSO(multi-objective particle swarm optimization,多目标粒子群优化)算法求解Pareto前沿,并基于熵权-TOPSIS(technique for order preference by similarity to an ideal solution,逼近理想解排序法)确定最优设计参数组合。结果显示:优化后防撞装置的峰值载荷降低了36.15%,总质量减小了12.23%,显著提升了耐撞性能并实现了轻量化目标。所提出的方法可为BFRP/铝混合防撞装置的轻量化设计提供一套系统性的解决方案。
基金Supported by National Natural Science Foundation of China(Grant No.51675021).
文摘The tire acoustic cavity resonance(TACR)noise is a significant source of the structure-borne noise inside a vehicle in the low-frequency range.This paper studies the noise dissipation effect of porous materials in reducing the TACR noise,an attempt to clarify the acoustic reduction mechanism and improve the accompanying vehicle interior noise level.A numerical model of a simplified tire cavity with rigid boundaries and acoustic excitation is established and further validated by the experiment.The effects of porous parameters on TACR frequency and sound pressure are then investigated and compared.The result reveals that the most influential material parameters are the porosity and material volume.It is also shown that the effectiveness of porous material in the mitigation of noise originates from the curliness of the material,which results in much larger acoustic impedance near the excitation position.Therefore,the sound absorption performance of the cavity attached with porous material proves to be excellent compared to that of the porous material itself.For further studying the damping effects of structural coupling,the flexible boundary of the tire tread is introduced.The results show that the porosity,material volume and structural loss factor of the tread all play important roles in reducing TACR noise.
