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- 저자 : Xiaokun Hu (검색결과 2 건)
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Xiaokun Hu,Qiangqiang Zhao,Yitao Yang,Shaoke Wan,Yanhui Sun,Jun Hong 한국CDE학회 2023 Journal of computational design and engineering Vol.10 No.5
The rotation accuracy of a machine tool spindle is essential for ensuring the machining precision. Due to the existence of manufacturing and assembly errors, the rotation accuracy of the spindle will be inevitably impacted and degraded. Therefore, to reduce the influence of the errors and improve the work performance, this paper focuses on accuracy analysis for the spindle and a novel optimization-oriented skin model shape method to tackle this highly complex problem. First, a structural analysis of the spindle is carried out to elaborate the intractable full parallel collections in the assembly. Then, based on the iterative closest point method, the deviation propagation of the spindle considering complex full parallel collections is transformed into an optimization problem, in which the skin model shapes and small displacement torsor are utilized to represent the form and pose errors of the part, respectively. By solving the optimization problem, assembly accuracy analysis for the spindle in terms of full parallel connections and form errors is accordingly achieved. On this basis, the tolerance analysis model of the spindle is also comprehensively established by employing the corresponding error simulation. Finally, measurement experiments are conducted to validate the effectiveness of the proposed method. The experiments show the predicted rotation runout and tolerance magnitude are close to the testing results, therefore indicating the proposed method can provide effective accuracy analysis for spindles.
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Xiaokun He,Renjie Hu 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.3
When compared to the conventional AC collection system, the DC collection system for renewable energy sources presents lots of advantages. High power high-voltage DC/DC converters are essential equipment for medium voltage DC (MVDC) grid. A novel zero-current-switching full-bridge DC/DC converter is proposed in this paper. In particular, a blocking capacitor is introduced to rapidly decay the circulating current to zero. Hence, both the switching loss and conduction loss can be reduced. A scaled-down 120 V/1.2 kV, 2 kW prototype was built to validate the effectiveness of the proposed converter.
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