The development of a small PEMFC combined heat and power system

A proton exchange membrane fuel cell combined heat and power system has been chosen as a platform on which key components and system integration technologies have been developed to advance the applications of fuel-cell technology. The prototype system consists mainly of a fuel-cell stack, a natural gas reformer to supply hydrogen-rich reformate gas to the stack, a power conditioner to convert and invert the electricity generated by the stack, and a water and heat management network to provide the oxidizer (air) to and necessary cooling and humidification for the stack. The design of the stack and its components, catalysts development, design and testing of the natural gas reformer, were studied. In addition, the durability of a CO tolerant membrane-electrode-assembly has been studied with the assistance of air bleeding. Preliminary testing of the prototype combined heat and power system was carried out. It was found that the maintenance of a uniform output voltage across all single cells was more difficult with reformatted gas rather than using pure hydrogen. It was also found that the design of water and heat management network played an important role in the overall efficiency of the system.     

基于ANSYS的机车车体结构有限元计算模板的研究与应用

利用APDL程序语言与宏技术组织和管理ANSYS命令,建立了车体结构有限元计算模板。初步实现了车体结构有限元建模、计算和后处理的全程参数化,加快了建模速度,提高了分析效率。并以"HXD"号机车车体为例,验证了有限元计算模板的可行性和有效性。     

三维虚拟仿真系统有限元参数化方法实现

为保证吊装的安全进行,吊装辅助件的选择与设计至关重要,通常采用人工校核的方法,且多有重复性,有必要对有限元分析软件ANSYS进行二次开发,实现吊装辅助件的参数化分析。本文采用ANSYS自带编程语言APDL编写参数化命令流程序,对其进行参数化有限元分析,并通过具体算例证明了该方法的可行性与准确性。     

基于ANSYS二次开发的机床主轴单元分析系统

基于VB和ANSYS提供的二次开发工具APDL,建立了数控机床主轴单元参数化分析系统.此系统具有友好、方便、易用的人机交互界面,对复杂、难于理解和掌握的ANSYS命令流进行了后台封装,避免了大量的重复性分析工作,提高了分析效率,为机床主轴单元的合理设计提供了依据.     

基于ANSYS的二次开发在张弦立体桁架结构设计中的应用

张弦立体桁架结构在大跨度空间结构中有着广泛的应用。一个成功的张弦立体桁架结构设计方案需要经过多次计算及优化。而长期以来对该类问题的求解一般是通过开发相应的有限元程序来完成,但是开发程序需要大量的人力、物力,开发周期长,程序代码的利用率低。基于ANSYS的二次开发语言APDL和UIDL,编制张弦空间立体桁架计算程序,为结构工程师和研究人员对空间立体桁架的受力性能和结构优化分析进行进一步研究提供依据和参考模型,以提高科研和设计的工作效率。     

基于ANSYS搅拌容器的参数化建模

搅拌容器是化工机械搅拌设备的关键部件之一,在对搅拌设备进行设计、开发过程中,对搅拌容器模型的建立十分重要。利用ANSYS自带的APDL命令流,实现了搅拌容器的参数化建模,简化了搅拌容器在ANSYS图形用户界面下的重复建模工作,提高了工作效率。     

齿轮轴参数化有限元分析系统的开发

进行齿轮轴的静力分析时,常采用在三维软件中建立模型,并导入有限元分析软件中进行计算的方式。对于系列化的产品,以上过程无法实现快速改型设计,进行大量重复性工作,工作效率低下。针对以上问题,提出了齿轮轴的参数化有限元分析系统的总体框架;以VC++6.0为开发平台,实现了系统各模块的功能。整个过程完成了对ANSYS中APDL语句的封装以及对ANSYS核心程序的调用。以某齿轮轴的设计分析全过程为实例进行了详细说明,解决了ANSYS中完成同类分析时界面不友好及耗时较长的问题。     

Investigation of debonding propagation in aluminum/composite joints under fatigue loading

In this paper, Fracture Mechanics is used to predict debonding propagation in adhesive joint between aluminum and composite plates. Three types of loadings (λ = 0, λ = 0.5, and λ = 1 when λ is the ratio of lateral to in-plane loading) and two types of glass–epoxy composite sequences: [0/90]_2s and [0/45/?45/90]_s are considered for the composite plate and their results are compared. It was seen that generally the cases with stacking sequence of [0/45/?45/90]_s have much shorter lives than cases with [0/90]_2s. It was also seen that in cases with λ = 0, the ends of the debonding front propagates forward more than its middle, while in cases with λ = 0.5 or λ = 1 it is vice versa. Moreover, regardless of value of λ, the difference between the debonding propagations of the ends and the middle of the debonding front is very close in cases λ = 0.5 and λ = 1. Another main conclusion was that the non-dimensionalized debonding front profile is almost independent of sequence type or the applied load value.     

基于ANSYS的塔机底盘结构的模态分析

利用ANSYS的APDL语言对塔机底盘结构进行参数化建模和模态分析,得到塔机底盘结构前20阶固有频率及相应频率下的振型,得到动力学响应分析的初步数据,且数据符合工程实际应用。可以看出随着模态分析阶数的增加,固有频率呈递增趋势,当频率为61．633Hz时,结构的振型变化最为明显,且主要表现为塔机底盘基础节部分的腹杆的左右摆动。     

大吨位桥式起重机主梁腹板开门处有限元分析

本文以起重量为200t,跨度为31m的桥式起重机为例,运用Visual C++6.0对ANSYS进行二次开发,借助ANSYS自带的参数化设计语言(APDL)根据桥式起重机桥架结构的特点采用自底向上的方法建立桥架结构的参数化有限元模型,并实现有限元分析过程的程序化。在此基础上,着力研究影响主梁腹板开门处应力分布的各个因素,为今后大吨位桥式起重机主梁腹板开门处的合理设计提供有益的参考。