The estimated service life of this battery in diesel locomotive was about twice as long as that of its original battery, and it was maintain-free.
性能测试表明起动性能良好，在机车上的使用寿命预期比原有电池提高一倍左右，且无需维护。
Normal service life of U74 heavy rail and service life of the damaged rail are estimated by fracture dynamical analysis and possible mechanism on the longitudinal crack on the rail discussed.
通过断裂力学分析，估算出u 74重轨的正常使用寿命及伤轨残余使用寿命；探讨了钢轨纵裂的可能机制。
The random stress of torsion rod spring may be calculated after road surface, vehicle speed arid constructional parameters are given, and service life may be estimated according to P-S-N curve.
在给走路面、车速、结构参数后，可计算出扭杆的随机应力，并根据P - S - N曲线估计出扭杆的寿命。
The random stress of torsion rod spring may be calculated after road surface, vehicle speed arid constructional parameters are given, and service life may be estimated according to P-S-N curve.
在给走路面、车速、结构参数后，可计算出扭杆的随机应力，并根据P - S - N曲线估计出扭杆的寿命。
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