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基于弯扭复合的曲轴应力及响应面优化分析
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国家自然科学基金资助项目(51776089)


Crankshaft Stress and Response Surface Optimization Based on Bend-twist Compounding
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    摘要:

    为了研究曲轴承受弯扭复合载荷时,其圆角应力的变化情况,建立了柴油机曲轴弯扭复合模型,采用试验的方法验证了模型的准确性。模拟了标定工况下,曲轴过渡圆角处最大弯曲、扭转以及弯扭复合应力随曲轴转角的变化规律。选择最大弯扭复合载荷,以曲轴质量为约束条件,运用Workbench Design Exploration优化模块对曲轴最大应力和最大变形进行响应面优化分析。结果表明:在0~180°CA内,随着曲轴转角增加,弯扭复合圆角应力先增大后减小,最大值出现在上止点后15°CA,此时的圆角应力比最大爆发压力时的圆角应力大4.9%,比上止点时的圆角应力大26%。过渡圆角半径对曲轴应力和变形敏感度最大,敏感度分别为-0.426和-0.563。通过响应面优化分析,在满足约束条件的情况下,优化后的曲轴最大应力减少了14.45%,最大变形减小了18.17%。

    Abstract:

    In order to study the change of the fillet stress when the crankshaft is subjected to the bend-twist compounding load,a crankshaft of bend-twist compounding model is established and the accuracy of the model is verified by experiment.Under calibrated working conditions,the variation law of the maximum bend,twist,bend-twist compounding stress at transition fillet with the crankshaft angle was simulated.The maximum bend-twist compounding load was selected and the crankshaft quality was used as the constraint condition.The Workbench Design Exploration optimization module was used to optimize the response surface of the crankshaft for maximum stress and maximum deformation.The results show that within 0~180° Calibrated Angle(CA),with the increase of crankshaft angle,the fillet stress increases first and then decreases.The maximum fillet stress occurs 15°CA after (Top Dead Center)TDC.At the same time,the fillet stress is 4.9% larger than the maximum burst pressure moment and 26% larger than the fillet stress when the crankshaft at TDC.The transition fillet radius is the most sensitive to stress and deformation,and the sensitivity is -0.426 and -0.563.Through the response surface optimization analysis,the maximum stress of the crankshaft is reduced by 14.45% and the maximum deformation is reduced by 18.17% under the constraint condition.

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施佳裕,王忠,殷文元.基于弯扭复合的曲轴应力及响应面优化分析[J].机床与液压,2020,48(1):116-120.
. Crankshaft Stress and Response Surface Optimization Based on Bend-twist Compounding[J]. Machine Tool & Hydraulics,2020,48(1):116-120

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  • 在线发布日期: 2020-03-12
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