两栖装甲车辆兴波阻力的计算及流场分析

为了研究兴波阻力对两栖车辆航速的影响,建立了某型两栖车辆兴波阻力的数学模型,应用连续源分布法计算了兴波阻力;根据车体外部流场结构和求解要求,采用非结构化网格与网格自适应技术实施区域离散化,运用计算流体动力学(CFD)求解了车辆周围流域的压力场,并进行了流场分析。算例和流场分析结果表明:这种兴波阻力的计算方法可用于排水型两栖车辆的最高航速预报和减阻提速的研究。

Calculation of Wave-making Resistance and Analysis of Flow Field for Amphibious Armored Vehicles

In the near-infrared spectrum (NIR) quantitative analysis for propellant, the method of partial least squares is a good tool to establish the calibration model, but there are some problems, such as too much variables and variegated collinear of spectrum. A multivariate calibration modeling procedure called as interval and combination partial least square (icPLS) was applied to select the efficient spectral regions for building the flash point NIR model of aviation kerosene. The root mean square errors of prediction (RMSEP) and correlation coefficients (R₂) of icPLS and whole spectral partial least squares (PLS) were 1.08, 0.808 8 and 1.6, 0.738 1, respectively. The comparison of two methods indicates that the icPLS is more robust and credible than PLS. Furthermore, icPLS model can give more stable and accurate prediction results.