Fourteen SAE standards related to accommodation and occupant＇ packaging for vehicle interior are studied. The influencing factors, key reference accommodation points and major design dimensions and their relationship...Fourteen SAE standards related to accommodation and occupant＇ packaging for vehicle interior are studied. The influencing factors, key reference accommodation points and major design dimensions and their relationships of occupant packaging and ergonomics during the vehicle interior layout design and development are analyzed. Prototypes are presented to verify the results and how to achieve the packaging is shown. Auto- mobile designers can achieve significant practical guidance for human safety, efficiency accommodation and occupant packaging of all passengers during the vehicle design process.展开更多
The components of railway landscape were analyzed,and the railway landscape was classified as railway interior and exterior landscape from the perspective of its characters.After analysis and summarization,the compone...The components of railway landscape were analyzed,and the railway landscape was classified as railway interior and exterior landscape from the perspective of its characters.After analysis and summarization,the components and contents of the railway landscape factors were put forward.展开更多
This paper is concerned with the inverse scattering problems for Schrdinger equations with compactly supported potentials.For purpose of reconstructing the support of the potential,we derive a factorization of the sca...This paper is concerned with the inverse scattering problems for Schrdinger equations with compactly supported potentials.For purpose of reconstructing the support of the potential,we derive a factorization of the scattering amplitude operator A and prove that the ranges of （A＊ A） ^1/4 and G which maps more general incident fields than plane waves into the scattering amplitude coincide.As an application we characterize the support of the potential using only the spectral data of the operator A.展开更多
通过程序框图计算了多个子系统功率流平衡方程,建立了轿车SEA(Statistical Energy Analysis,SEA)系统模型,含车身结构模型和车内声腔模型,计算了模态密度、内损耗因子、耦合损耗因子及外部激励参数并进行仿真分析。将分析结果和实验进...通过程序框图计算了多个子系统功率流平衡方程,建立了轿车SEA(Statistical Energy Analysis,SEA)系统模型,含车身结构模型和车内声腔模型,计算了模态密度、内损耗因子、耦合损耗因子及外部激励参数并进行仿真分析。将分析结果和实验进行对比,结果证明在200 Hz和20 kHz中高频范围里车内噪声实验值和预测值基本吻合,整体相对值相差不到5%。对汽车产品初步开发、优化设计有借鉴意义。展开更多
为了降低驾驶员头部声腔噪声,基于统计能量分析(Statistical Energy Analysis,SEA)原理,将汽车划分为79个结构子系统和8个声腔子系统。采用导纳法对复杂结构子系统的模态密度进行仿真,利用稳态能量流方法计算得到复杂结构的内损耗因子,...为了降低驾驶员头部声腔噪声,基于统计能量分析(Statistical Energy Analysis,SEA)原理,将汽车划分为79个结构子系统和8个声腔子系统。采用导纳法对复杂结构子系统的模态密度进行仿真,利用稳态能量流方法计算得到复杂结构的内损耗因子,计算了子系统间的耦合损耗因子。试验测量了动力总成振动和路面随机输入对车身的激励,测试了发动机舱声激励,建立了轿车的CFD模型,对车外风激励进行了仿真。在上述研究工作的基础上建立SEA分析模型,分析预测了驾驶员头部的噪声,通过试验对比,验证了统计能量分析模型的准确性。据此提出降低头部声腔噪声的3种措施并对比,得出最有效的噪声控制措施。展开更多
基金the National Natural Science Foundation of China (19832020)National Outstanding Youth Science Foundation of China(10125208)
文摘Fourteen SAE standards related to accommodation and occupant＇ packaging for vehicle interior are studied. The influencing factors, key reference accommodation points and major design dimensions and their relationships of occupant packaging and ergonomics during the vehicle interior layout design and development are analyzed. Prototypes are presented to verify the results and how to achieve the packaging is shown. Auto- mobile designers can achieve significant practical guidance for human safety, efficiency accommodation and occupant packaging of all passengers during the vehicle design process.
文摘The components of railway landscape were analyzed,and the railway landscape was classified as railway interior and exterior landscape from the perspective of its characters.After analysis and summarization,the components and contents of the railway landscape factors were put forward.
基金The Major State Basic Research Development Program Grant (2005CB321701)the Heilongjiang Education Committee Grant (11551364) of China
文摘This paper is concerned with the inverse scattering problems for Schrdinger equations with compactly supported potentials.For purpose of reconstructing the support of the potential,we derive a factorization of the scattering amplitude operator A and prove that the ranges of （A＊ A） ^1/4 and G which maps more general incident fields than plane waves into the scattering amplitude coincide.As an application we characterize the support of the potential using only the spectral data of the operator A.
文摘通过程序框图计算了多个子系统功率流平衡方程,建立了轿车SEA(Statistical Energy Analysis,SEA)系统模型,含车身结构模型和车内声腔模型,计算了模态密度、内损耗因子、耦合损耗因子及外部激励参数并进行仿真分析。将分析结果和实验进行对比,结果证明在200 Hz和20 kHz中高频范围里车内噪声实验值和预测值基本吻合,整体相对值相差不到5%。对汽车产品初步开发、优化设计有借鉴意义。
文摘为了降低驾驶员头部声腔噪声,基于统计能量分析(Statistical Energy Analysis,SEA)原理,将汽车划分为79个结构子系统和8个声腔子系统。采用导纳法对复杂结构子系统的模态密度进行仿真,利用稳态能量流方法计算得到复杂结构的内损耗因子,计算了子系统间的耦合损耗因子。试验测量了动力总成振动和路面随机输入对车身的激励,测试了发动机舱声激励,建立了轿车的CFD模型,对车外风激励进行了仿真。在上述研究工作的基础上建立SEA分析模型,分析预测了驾驶员头部的噪声,通过试验对比,验证了统计能量分析模型的准确性。据此提出降低头部声腔噪声的3种措施并对比,得出最有效的噪声控制措施。
