经济使用寿命

既有铁路混凝土桥梁的维修及经济使用寿命预测

Maintenance and Economic Service Life Prediction of Existing Railway Concrete Bridges

JD－4450型拖拉机经济使用寿命的研究

Study on the reasonable service life for imported jd-4450 tractor

桥梁加固后的经济使用寿命评估

Estimation on Economic Using Life of Reinforced Bridge

对有关经济使用寿命的指标进行分析研究。

And the index relating to the reasonable service life were analyzed and studied in this paper .

建立了一个使金属切除率最大为目标函数，刀具经济使用寿命、加工精度、机床功率和机床进给机构强度等为约束条件的数学模型。

An optimization model is formed with cutting volume of metal as the objective function , and machining time , machining accuracy , capacity of machining tool and feeding intensity of machining tool as constraints .

变压器线圈热点温度是变压器安全、经济运行和使用寿命的主要决定因素。

Winding hot-point temperature is one of the key factors to safety and economy operation as well as life of transformers .

设备选型遵循技术先进、安全可靠、经济合理、使用寿命长的原则。

Selection of the equipment shall comply with the principle of state-of-the-art technology , safety and reliability , economy and rationality and long service life .

曲轴作为往复泵动力端中最关键的受力零件，它的可靠性直接影响着整机的可靠性、经济性以及使用寿命。

Crankshaft is one of the most critical parts in reciprocating pump dynamic section , its reliability directly affect the economy , reliability , and service life of the machine .

缸套-活塞环摩擦副的工作直接影响到内燃机的效率、经济指标、使用寿命及污染物的排放等。

The feature of friction between cylinder liner and piston ring affects all the technical and economic indexes , uses and service life and emission of pollutant of internal combustion engine directly .

柴油机凭借其循环热效率高、燃油经济性好和使用寿命长等优点逐渐被客车和卡车所普遍接受。

Diesel engines have been widely used in passenger cars and trucks because of their attractive characteristics such as high thermal efficiency , fuel economy , and durability .

运用可持续发展思想和经济优化理论，结合桥梁结构时变可靠度理论，提出了桥梁加固后剩余经济使用寿命的计算方法，可应用于桥梁加固工程的持续性评价。

Applying sustainable development idea and economic optimization theories , combining reliability-based time of bridge structure , the dissertation establishes calculating method of strengthening bridge 's remaining economic service lifespan . This can be applied in persistent evaluation of bridges strengthening .