摘要：基于虚拟载荷谱技术,提出一种新的疲劳寿命计算方法.以锥齿轮减速系统作为研究对象,对齿轮接触模型进行有限元分析,得到锥齿轮传动工况的应力分析结果及云图数据.将应力结果进行数据处理,得到锥齿轮的虚拟载荷谱.根据Miner准则和Corten-Do-lan准则估算出锥齿轮传动的疲劳寿命,并与仿真云图寿命结果相比较.应用实例表明,基于虚拟载荷谱计算的疲劳寿命分析结果具有较高的安全性和可靠性,具有较大的工程应用价值.

摘要：针对粒子群优化算法在处理约束问题时产生的不可行解,引用基于多级罚函数的约束处理方法。为了改进罚函数粒子群算法易早熟、后期收敛慢、易陷入局部最优解的缺点,提出了动态改变惩罚系数的改进粒子群算法。应用于几个经典的测试函数,都在较少的迭代次数内得到了高精度的优化解,验证了算法的有效性。以某一机械零部件的可靠性优化为例,建立了基于改进粒子群算法的可靠性优化设计模型。结果表明:该方法能快速有效地解决可靠性优化设计问题,计算结果明显优于常规的多级罚函数法。

摘要：车架是非承载式车辆的重要承载部件,对保证汽车安全行驶起着重要作用,因此保证车架的可靠性尤为重要。对车架进行轻量化研究对保障车辆安全性、节能减排以及减少生产成本等方面有重要的现实意义。首先建立某车型的车架参数化模型,并在此基础上进行可靠性分析,得到车架的位移概率分布图及可靠性数据,然后用ANSYS的优化模块对车架进行优化,最后应用ISIGHT联合ANSYS对其进行结构轻量化研究。结果显示,ISIGHT联合ANSYS优化得到车架模型尺寸较为理想,达到了轻量化设计的目的。

摘要：Electrochemical CO_(2)reduction reaction(CO_(2)RR)driven by sustainable energy has emerged as an attractive route to achieve the target of carbon *** is one of the most economically viable products,and electrocatalytic CO_(2)RR to formate is a promising ***-pressure H-cell electrolyzer is easy to operate and allows high CO_(2)solubility for realizing high current density,but the design of highly efficient catalysts for working under high CO_(2)pressures remains ***-based catalysts exhibit high formate selectivity,but suffer from limited ***,we report a high-performance catalyst,which is derived from BiPO_(4)nanopolyhedrons during electrocatalytic CO_(2)RR to formate in neutral solution under high CO_(2)pressures.A high partial current density of formate(534 mA cm^(−2))and formate formation rate(9.9 mmol h^(−1) cm^(−2))with a formate Faradaic efficiency of 90%have been achieved over BiPO_(4)-derived catalyst at an applied potential of−0.81 V *** under 3.0 MPa CO_(2)*** discover that BiPO_(4)nanopolyhedrons evolve into metallic Bi nanosheets with rich grain boundaries in electrocatalytic CO_(2)RR under high CO_(2)pressures,and the grain boundaries of the BiPO_(4)-derived catalyst play a vital role in promoting electrocatalytic CO_(2)RR to *** theoretical studies reveal that the charge redistribution occurs at the grain boundaries of Bi surface,and this promotes CO_(2)activation and increases HCOO^(*)intermediate stability,thus making the pathway for CO_(2)RR to formate more selective and *** work not only demonstrates a highly efficient catalyst for CO_(2)RR to formate but also discovers a unique feature of catalyst evolution under high CO_(2)pressures.

摘要：基于模块化设计的智能电力设备技术,可满足智能电网采集全电量数据,有效控制执行设备,数据存储、交换及信息安全,多通信接口等方面的要求,以实际应用情况说明该设备在智能电网实践中起到的作用。

摘要：基于模块化设计的智能电力设备技术,可满足智能电网采集全电量数据,有效控制执行设备,数据存储、交换及信息安全,多通信接口等方面的要求,以实际应用情况说明该设备在智能电网实践中起到的作用。

摘要：试验采用单因素试验设计研究了抗凝剂添加比例、抗凝剂浓度、冷藏温度、存储时间4个因素对喷雾干燥后的鸡血浆蛋白粉品质的影响。结果表明,抗凝剂添加比例、抗凝剂浓度、存储罐体温度、存储时间分别为5.0‰、12.0%、6.0℃、24h时,喷雾干燥鸡血浆蛋白粉的品质最佳。