段浩 , 陈晖 , 翟兆阳 , 等 . 基于支持向量机的氢混天然气发动机性能预测 [J ] . 兵工学报 , 2022 , 43 ( 5 ): 1002 - 1011 . DOI: 10.12382/bgxb.2021.0199 http://doi.org/10.12382/bgxb.2021.0199 为提高氢混天然气（HCNG）发动机的标定效率，精确预测发动机参数，对一台氢气体积分数为20%的HCNG燃料发动机进行试验研究和性能预测分析。基于高转速低负载工况稳态标定试验数据，采用支持向量机（SVM）方法建立发动机参数关联模型，并利用不同寻优算法为模型寻找最优参数，以提高各项参数的预测精度。结果显示：若发动机运行于最大扭矩点火正时，则等效天然气比消耗（BSFC）最小，NO_x比排放（BSNO_x）也处于较理想的水平，尤其在增加氢气比例时，这些外特性有更加显著的提升；SVM模型可以较好地描述发动机输入参数与输出参数之前的非线性关系，自变量与因变量之间的相关性较强（决定系数R²均大于0.97），模型的预测精度较高，利用遗传算法得出的最优预测模型具有较高的泛化能力，扭矩、BSFC、BSNO_x的平均绝对百分比误差分别仅为1.23%、1.98%、5.43%。

DUAN H , CHEN H , ZHAI Z Y , et al . Performance prediction of hydrogen-enriched compressed natural gas engine based on support vector machine [J ] . Acta Armamentarii , 2022 , 43 ( 5 ): 1002 - 1011 . (in Chinese) DOI: 10.12382/bgxb.2021.0199 http://doi.org/10.12382/bgxb.2021.0199 A hydrogen-enriched compressed natural gas (HCNG) fuel engine with hydrogen volume fraction of 20% is experimentally studied and its performance is analyzed to improve the calibration efficiency of HCNG fuel engine and accurately predict the engine parameters. An engine parameter association model is established by using support vector machine (SVM) based on the steady-state experimental calibration data under high speed and low load conditions，and the different optimization algorithms are used to improve the prediction accuracy of engine parameters. Results show that the engine has the minimum brake specific fuel consumption (BSFC) and ideal brake specific NO_x consumption level (BSNO_x) at the minimum advance for best torque.The external characteristics is obviously improved when increasing the hydrogen ratio especially. The SVM model can describe the nonlinear relationship between the input and output parameters of the engine，and has high prediction accuracy and strong correlation between independent variables and dependent variables (all coefficients of determination R² are all greater than 0.97). The optimal prediction model derived using the genetic algorithm has a high generalization capability，with mean absolute percentage errors of only 1.23%，1.98%，and 5.43% for torque，BSFC，and BSNO_x, respectively.

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张彤 , 李德才 , 李艳文 . 磁性液体密封与迷宫密封组合密封的结构设计及优化 [J ] . 机械工程学报 , 2022 , 58 ( 9 ): 172 - 181 . DOI: 10.3901/JME.2022.09.172 http://doi.org/10.3901/JME.2022.09.172 目前，磁性液体密封作为一种新型密封方式，具有零泄漏、无污染、寿命长等优点，但存在着耐温差和耐压差能力相对较弱，高速工况下容易失效的问题。而迷宫密封作为传统密封方式，具有泄漏量大的缺点，但适用于高温、高压和高速的工况，可以很好地弥补磁性液体密封的缺点。因此，设计了磁性液体密封与迷宫密封组合密封的结构，对极靴和轴套的结构尺寸进行正交试验和响应曲面法优化，得到了使组合密封结构耐压值最大的结构尺寸，为高温、高压、高速工况实现零泄漏密封提供了理论基础。

ZHANG T , LI D C , LI Y W . Design and optimization of combined magnetic fluid seal and labyrinth seal [J ] . Journal of Mechanical Engineering , 2022 , 58 ( 9 ): 172 - 181 . (in Chinese) DOI: 10.3901/JME.2022.09.172 http://doi.org/10.3901/JME.2022.09.172 At present, as a new sealing method, magnetic fluid seal has the advantages of zero leakage, no pollution and long life, but it is relatively weak when the temperature or pressure is high and it is easy to fail under high-speed working conditions. As a traditional sealing method, labyrinth seal has the disadvantage of large leakage, but it is suitable for high-temperature, high-pressure and high-speed working conditions, so it can make up for the shortcomings of magnetic fluid seal well. Therefore, the combined seal structure of magnetic fluid seal and labyrinth seal is designed, and the structural size of pole shoe and shaft sleeve is optimized by orthogonal test and response surface method. The structural size that could maximize the pressure resistance value of the combined seal is obtained, which may provide a theoretical basis for zero-leakage sealing under high-temperature, high-pressure and high-speed conditions.

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刘检华 , 张飞凯 , 丁晓宇 . 弹塑性粗糙表面实际接触面积演变规律研究 [J ] . 机械工程学报 , 2021 , 57 ( 7 ): 109 - 116 . DOI: 10.3901/JME.2021.07.109 http://doi.org/10.3901/JME.2021.07.109 粗糙表面的实际接触面积直接影响精密机电设备配合表面的摩擦因数、热导/电导率、接触应力等。然而，针对弹塑性接触行为进行系统性地研究很少，弹塑性粗糙表面实际接触面积的演变规律尚不明确。针对这一问题，通过理论研究获得了弹塑性粗糙表面实际接触面积的影响因素，并引入弹塑性接触力学数值计算方法，对具有不同材料参数和表面形貌特征的弹塑性粗糙表面的接触行为进行数值仿真计算，得到各种情况下的表面实际接触面积随着平均接触压力的变化曲线，总结出了实际接触面积演变规律与这些影响因素之间的映射关系，并最终得到实际接触面积的计算公式，为弹塑性接触力学的相关工程应用奠定了基础。

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