近年来,随着车辆设计向轻量化、高强度化方向发展,边三轮车车架作为关键的承载结构,其性能直接影响车辆的整体强度和稳定性.车架在复杂工况下承受纵向弯曲、横向弯曲和扭转载荷,因此在设计车架过程中不仅需满足强度和刚度要求,还需确保...近年来,随着车辆设计向轻量化、高强度化方向发展,边三轮车车架作为关键的承载结构,其性能直接影响车辆的整体强度和稳定性.车架在复杂工况下承受纵向弯曲、横向弯曲和扭转载荷,因此在设计车架过程中不仅需满足强度和刚度要求,还需确保车架长期使用的可靠性与安全性.有限元分析(Finite element analysis,FEA)作为一种高效的结构性能研究手段,能够通过精确建模和仿真分析对车架在静态和动态载荷作用下的应力分布、变形及振动特性进行全面评估,从而为结构性能的验证提供理论依据和数据支持.相较于传统经验设计与试验验证方法,有限元分析具有高效性和精确性的优势,已广泛应用于车架结构的设计和分析.然而,现有研究多集中于车架的轻量化设计,对于标准载荷条件下对既有设计的性能验证研究较为稀缺.本研究针对某边三轮车架,基于ANSYS Workbench有限元分析软件对其结构性能进行系统验证.首先,采用APDL语言编写参数化建模命令流,建立了车架的三维模型,并对非承载部分进行了合理简化处理,以提高计算效率;其次,通过静力学分析,评估车架在设计载荷下的应力分布和变形情况,验证其强度设计的合理性;再次,通过模态分析获取车架的前六阶固有频率和振型,评估其动态特性及共振风险;最后,结合路面振动台架试验,验证车架在实际振动环境下的稳定性和耐久性.本研究旨在验证现有设计的合理性,为边三轮车架在实际工况下的强度和动态性能提供科学评估,同时为类似结构的设计与工程应用提供重要参考.展开更多
Some theorems of compactly supported non-tensor product form two-dimension Daubechies wavelet were analysed carefully. Compactly supported non-tensor product form two-dimension wavelet was constructed, then non-tensor...Some theorems of compactly supported non-tensor product form two-dimension Daubechies wavelet were analysed carefully. Compactly supported non-tensor product form two-dimension wavelet was constructed, then non-tensor product form two dimension wavelet finite element was used to solve the deflection problem of elastic thin plate. The error order was researched. A numerical example was given at last.展开更多
The adaptive mesh refinement （AMR） method is applied in the 2-D Euler multi-component elasticplastic hydrodynamics code （MEPH2Y）. It is applied on detonation. Firstly, the AMR method is described, including a cons...The adaptive mesh refinement （AMR） method is applied in the 2-D Euler multi-component elasticplastic hydrodynamics code （MEPH2Y）. It is applied on detonation. Firstly, the AMR method is described, including a conservative spatial interpolation, the time integration methodology with the adapitve time increment and an adaptive computational region method. The advantage of AMR technique is exhibited by numerical examples, including the 1-D C-J detonation and the 2-D implosion ignited from a single point. Results show that AMR can promote the computational efficiency, keeping the accuracy in interesting regions.展开更多
By considering the effect of suspended solid particles in the ordinary equations for two-dimension inviscid incompressible mixing layer, the Rayleigh equation and the modified Rayleigh equation are obtained. And then,...By considering the effect of suspended solid particles in the ordinary equations for two-dimension inviscid incompressible mixing layer, the Rayleigh equation and the modified Rayleigh equation are obtained. And then, by solving the corresponding eigen-value equations with numerical computational method, the relation curves between perturbation frequency and spacial growth rate of the mixing layer for the varying particle loading, ratio of particle velocity to fluid velocity and Stokes number are got. Sever al important conclusions on the effect of suspended solid particles on unstability of the mixing layer are presented in the end by analyzing all the relation curves.展开更多
The surface quality of fine-grained ZrO2 engineering ceramic were researched using 270# diamond wheel both with and without work-piece two-dimension ultrasonic vibration grinding（WTDUVG）. By AFM images, the surface ...The surface quality of fine-grained ZrO2 engineering ceramic were researched using 270# diamond wheel both with and without work-piece two-dimension ultrasonic vibration grinding（WTDUVG）. By AFM images, the surface topography and the micro structure of the two-dimensional ultrasonic vibration grinding ceramics were especially analyzed. The experimental results indicate that the surface roughness is related to grinding vibration mode and the material removal mechanism. Surface quality of WTDUVG is superior to that of conventional grinding, and it is easy for two-dimensional ultrasonic vibration grinding that material removal mechanism is ductile mode grinding.展开更多
As a kind of subculture, The two-dimensional culture came of age during the 1970s in Japan and spread to China in the 1980s. In China, the culture has become an important economic force and social capital get more and...As a kind of subculture, The two-dimensional culture came of age during the 1970s in Japan and spread to China in the 1980s. In China, the culture has become an important economic force and social capital get more and more attention to it as well. This paper mainly discusses the origin and development of the two-dimensional clothing, and summed up the inherent characteristics and the internal developing law of it, furthermore, on the stage of current situation of two-dimensional economy this paper will conclude the development trend of next days.展开更多
文摘近年来,随着车辆设计向轻量化、高强度化方向发展,边三轮车车架作为关键的承载结构,其性能直接影响车辆的整体强度和稳定性.车架在复杂工况下承受纵向弯曲、横向弯曲和扭转载荷,因此在设计车架过程中不仅需满足强度和刚度要求,还需确保车架长期使用的可靠性与安全性.有限元分析(Finite element analysis,FEA)作为一种高效的结构性能研究手段,能够通过精确建模和仿真分析对车架在静态和动态载荷作用下的应力分布、变形及振动特性进行全面评估,从而为结构性能的验证提供理论依据和数据支持.相较于传统经验设计与试验验证方法,有限元分析具有高效性和精确性的优势,已广泛应用于车架结构的设计和分析.然而,现有研究多集中于车架的轻量化设计,对于标准载荷条件下对既有设计的性能验证研究较为稀缺.本研究针对某边三轮车架,基于ANSYS Workbench有限元分析软件对其结构性能进行系统验证.首先,采用APDL语言编写参数化建模命令流,建立了车架的三维模型,并对非承载部分进行了合理简化处理,以提高计算效率;其次,通过静力学分析,评估车架在设计载荷下的应力分布和变形情况,验证其强度设计的合理性;再次,通过模态分析获取车架的前六阶固有频率和振型,评估其动态特性及共振风险;最后,结合路面振动台架试验,验证车架在实际振动环境下的稳定性和耐久性.本研究旨在验证现有设计的合理性,为边三轮车架在实际工况下的强度和动态性能提供科学评估,同时为类似结构的设计与工程应用提供重要参考.
文摘Some theorems of compactly supported non-tensor product form two-dimension Daubechies wavelet were analysed carefully. Compactly supported non-tensor product form two-dimension wavelet was constructed, then non-tensor product form two dimension wavelet finite element was used to solve the deflection problem of elastic thin plate. The error order was researched. A numerical example was given at last.
基金Sponsored by the National Natural Science Foundation of China(10676120)Laboratory of Computational Physics Foundation(9140C690101070C69)
文摘The adaptive mesh refinement （AMR） method is applied in the 2-D Euler multi-component elasticplastic hydrodynamics code （MEPH2Y）. It is applied on detonation. Firstly, the AMR method is described, including a conservative spatial interpolation, the time integration methodology with the adapitve time increment and an adaptive computational region method. The advantage of AMR technique is exhibited by numerical examples, including the 1-D C-J detonation and the 2-D implosion ignited from a single point. Results show that AMR can promote the computational efficiency, keeping the accuracy in interesting regions.
文摘By considering the effect of suspended solid particles in the ordinary equations for two-dimension inviscid incompressible mixing layer, the Rayleigh equation and the modified Rayleigh equation are obtained. And then, by solving the corresponding eigen-value equations with numerical computational method, the relation curves between perturbation frequency and spacial growth rate of the mixing layer for the varying particle loading, ratio of particle velocity to fluid velocity and Stokes number are got. Sever al important conclusions on the effect of suspended solid particles on unstability of the mixing layer are presented in the end by analyzing all the relation curves.
基金Funded by the Shanxi Province Science Foundation for Youths(2006021026)
文摘The surface quality of fine-grained ZrO2 engineering ceramic were researched using 270# diamond wheel both with and without work-piece two-dimension ultrasonic vibration grinding（WTDUVG）. By AFM images, the surface topography and the micro structure of the two-dimensional ultrasonic vibration grinding ceramics were especially analyzed. The experimental results indicate that the surface roughness is related to grinding vibration mode and the material removal mechanism. Surface quality of WTDUVG is superior to that of conventional grinding, and it is easy for two-dimensional ultrasonic vibration grinding that material removal mechanism is ductile mode grinding.
基金This research was financially supported by the National Natural Science Foundation of China （Grant NO. 00000000） and the Fundamental Research Funds for Central University （Grant NO.TD2010-2）.
文摘As a kind of subculture, The two-dimensional culture came of age during the 1970s in Japan and spread to China in the 1980s. In China, the culture has become an important economic force and social capital get more and more attention to it as well. This paper mainly discusses the origin and development of the two-dimensional clothing, and summed up the inherent characteristics and the internal developing law of it, furthermore, on the stage of current situation of two-dimensional economy this paper will conclude the development trend of next days.
