A new method named orthogonal two-way link-shift here has been proposed.Based on the method and a standard involute gear hob, a specific gear tooth profile (including anarbitrary gear tooth profile and a modified invo...A new method named orthogonal two-way link-shift here has been proposed.Based on the method and a standard involute gear hob, a specific gear tooth profile (including anarbitrary gear tooth profile and a modified involute gear tooth profile) can be generated on aCNC(computer numerical control) bobbing machine. Computer simulation has been carried out, and theresults prove that the method is right and practicable. So, the fabrication costs can be greatlydecreased than before. The new method has momentous significance to realize gear's optimizedmodification under different work conditions.展开更多
三端口隔离DC-DC变换器(triple active bridge,TAB)作为新能源接入的一种积极探索与尝试,在分布式光伏接入、新能源汽车以及多电压等级直流用电需求等领域得到了广泛关注。由于开关管数量增多,TAB移相角及占空比的组合方式较双有源桥DC...三端口隔离DC-DC变换器(triple active bridge,TAB)作为新能源接入的一种积极探索与尝试,在分布式光伏接入、新能源汽车以及多电压等级直流用电需求等领域得到了广泛关注。由于开关管数量增多,TAB移相角及占空比的组合方式较双有源桥DC-DC变换器出现了成倍增加的现象,现有的分段线性计算方法在计算TAB高频链交流电流时呈现出更大的计算难度和计算复杂性。TAB的高频链电流计算是变换器电流应力、有效值等多个优化目标的首要求解步骤,为后续的优化运行提供基础。基于此,文中提出一种简易的TAB高频链交流电流统一求解模型,可以同时得到所有占空比及移相角组合方式下的交流电流极点值。根据所推导的交流电流极点值统一公式,给出TAB各端口高频链交流电流峰值及有效值的计算方法。最后搭建实验平台,验证该方法的可行性与有效性。展开更多
基金This project is supported by National Natural Science Foundation of China (No.59905018) Provincial Excellent Young Scientist Foundation of Shandong (No.01BS033).
文摘A new method named orthogonal two-way link-shift here has been proposed.Based on the method and a standard involute gear hob, a specific gear tooth profile (including anarbitrary gear tooth profile and a modified involute gear tooth profile) can be generated on aCNC(computer numerical control) bobbing machine. Computer simulation has been carried out, and theresults prove that the method is right and practicable. So, the fabrication costs can be greatlydecreased than before. The new method has momentous significance to realize gear's optimizedmodification under different work conditions.
文摘三端口隔离DC-DC变换器(triple active bridge,TAB)作为新能源接入的一种积极探索与尝试,在分布式光伏接入、新能源汽车以及多电压等级直流用电需求等领域得到了广泛关注。由于开关管数量增多,TAB移相角及占空比的组合方式较双有源桥DC-DC变换器出现了成倍增加的现象,现有的分段线性计算方法在计算TAB高频链交流电流时呈现出更大的计算难度和计算复杂性。TAB的高频链电流计算是变换器电流应力、有效值等多个优化目标的首要求解步骤,为后续的优化运行提供基础。基于此,文中提出一种简易的TAB高频链交流电流统一求解模型,可以同时得到所有占空比及移相角组合方式下的交流电流极点值。根据所推导的交流电流极点值统一公式,给出TAB各端口高频链交流电流峰值及有效值的计算方法。最后搭建实验平台,验证该方法的可行性与有效性。
