研究了系统刚度、粘性阻尼系数尤其是变质量等参数对系统固有频率和阻尼比的影响。
The effect of stiffness constant, viscosity damper coefficient and variable mass on the damped frequency and the relative damping ratio of the system were studied.
从物流角度来讲，缩短冷链物流流程时间，能够减少食品变质的风险，提高安全系数。
From the point of logistics, reducing the time of cold chain logistics process can reduce the risk of food deterioration and raise the food safety level.
对物品变质率和需求价格敏感系数对零售商的订货量、订货周期、出售价格和单位时间利润的影响进行了数值分析，并给出了数值算例。
Sensitivity analysis with the numerical example shows that order quantity and replenishment cycle are very sensitive to the deterioration rate, but the retailer's profit per unit time is not. The …
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