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高强螺栓连接节点高温摩擦系数试验研究 被引量:2
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作者 佘晨岗 刘雁 +1 位作者 张超 张秋萍 《钢结构》 2013年第2期75-77,49,共4页
高温下摩擦系数的改变是影响摩擦型连接高强螺栓受力性能的一个主要因素。通过对6组取自同批次钢板做成的摩擦副进行的高温下摩擦系数试验,得到不同温度下高强螺栓连接节点的摩擦系数及Q235钢高温下的部分特征。试验结果表明:与常温下... 高温下摩擦系数的改变是影响摩擦型连接高强螺栓受力性能的一个主要因素。通过对6组取自同批次钢板做成的摩擦副进行的高温下摩擦系数试验,得到不同温度下高强螺栓连接节点的摩擦系数及Q235钢高温下的部分特征。试验结果表明:与常温下连接节点的摩擦系数相比,随着温度的升高,摩擦系数会不断降低,且在300℃以内,摩擦系数总体上表现为线性降低。 展开更多
关键词 高强螺栓连接节点 摩擦副 摩擦系数 线性降低
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多策略协同改进的阿基米德优化算法及其应用 被引量:6
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作者 罗仕杭 何庆 《计算机应用研究》 CSCD 北大核心 2022年第5期1386-1394,共9页
针对阿基米德优化算法(AOA)寻优过程中存在全局搜索能力弱、收敛精度低、易陷入局部最优等缺陷,提出一种融合多策略的阿基米德优化算法(MAOA)。首先,采用随机高斯变异策略选取适应度优的多个个体引导种群向最优解区域寻优,增强全局搜索... 针对阿基米德优化算法(AOA)寻优过程中存在全局搜索能力弱、收敛精度低、易陷入局部最优等缺陷,提出一种融合多策略的阿基米德优化算法(MAOA)。首先,采用随机高斯变异策略选取适应度优的多个个体引导种群向最优解区域寻优,增强全局搜索能力;其次,利用多种混沌映射的随机性、遍历性和多样性,引入局部混沌搜索策略扩大混沌空间的搜索范围,提高算法的局部开发能力;同时,为了协调算法的全局勘探和局部开采能力,提出一种非线性动态密度降低因子;最后,利用Lévy飞行引导机制的黄金正弦策略对种群位置进行扰动更新,增加迭代过程中种群的多样性,提高算法跳出局部最优的能力。通过对12个基准测试函数和部分CEC2014测试函数进行仿真实验,结果表明所提算法能够改善AOA全局探索能力弱、易陷入局部最优等缺点,提高AOA的寻优精度和稳定性。另外,引入机械设计案例进行测试分析,进一步验证MAOA在处理实际问题上的适用性和可行性。 展开更多
关键词 阿基米德优化算法 随机高斯变异策略 线性动态密度降低因子 Lévy飞行 黄金正弦 机械设计
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Analysis and Design of a High-Stability,High-Accuracy,Low-Dropout Voltage Regulator 被引量:2
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作者 沈良国 严祖树 +2 位作者 王钊 张兴 赵元富 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2007年第12期1872-1877,共6页
A high-accuracy,low-dropout (LDO) voltage regulator is presented. Using the slow-rolloff frequency compensation scheme, the LDO effectively overcomes the stability problem, facilitates the use of a ceramic capacitor... A high-accuracy,low-dropout (LDO) voltage regulator is presented. Using the slow-rolloff frequency compensation scheme, the LDO effectively overcomes the stability problem, facilitates the use of a ceramic capacitor, and improves the output voltage accuracy, which is critical for powering high-performance analog circuitry. The slow-rolloff compensation scheme is realized by introducing three pole-zero pairs, including the proposed polezero pair and sense zero. The post-layout simulation results demonstrate that this LDO has robust system stability, a high open-loop gain, and a high unit-gain frequency,which lead to excellent regulation and transient response performance. The line and load regulation are 27μV/V and 3.78μV/mA, and the overshoots of the output voltage are less than 30mV,while the dropout voltage is 120mV for a 150mA load current. 展开更多
关键词 voltage regulator LDO slow-rolloff frequency compensation line regulation load regulation
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A novel SMC-PHD filter based on particle compensation
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作者 徐从安 何友 +3 位作者 杨富程 简涛 王海鹏 李天梅 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第8期1826-1836,共11页
As a typical implementation of the probability hypothesis density(PHD) filter, sequential Monte Carlo PHD(SMC-PHD) is widely employed in highly nonlinear systems. However, the particle impoverishment problem introduce... As a typical implementation of the probability hypothesis density(PHD) filter, sequential Monte Carlo PHD(SMC-PHD) is widely employed in highly nonlinear systems. However, the particle impoverishment problem introduced by the resampling step, together with the high computational burden problem, may lead to performance degradation and restrain the use of SMC-PHD filter in practical applications. In this work, a novel SMC-PHD filter based on particle compensation is proposed to solve above problems. Firstly, according to a comprehensive analysis on the particle impoverishment problem, a new particle generating mechanism is developed to compensate the particles. Then, all the particles are integrated into the SMC-PHD filter framework. Simulation results demonstrate that, in comparison with the SMC-PHD filter, proposed PC-SMC-PHD filter is capable of overcoming the particle impoverishment problem, as well as improving the processing rate for a certain tracking accuracy in different scenarios. 展开更多
关键词 random finite set(RFS) probability hypothesis density(PHD) particle filter(PF) particle impoverishment particle compensation multi-target tracking(MTT)
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