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The performanes of the tracks of a track-test-rig were taken and the soil parameters at different conditions were measured with specially designed meters simultaneously. The relations between the track performances and the soil parameters were investigated in order that the formers would be predicted and compared from the informations of the latters。The details including:1. The relations between sinkages and load-carrying capacities., The"pressure-sinkage" model of Bekker and the "soil cone index" of WES were... The performanes of the tracks of a track-test-rig were taken and the soil parameters at different conditions were measured with specially designed meters simultaneously. The relations between the track performances and the soil parameters were investigated in order that the formers would be predicted and compared from the informations of the latters。The details including:1. The relations between sinkages and load-carrying capacities., The"pressure-sinkage" model of Bekker and the "soil cone index" of WES were tested to see their workability in the paddy fields. The coefficients K=K_φ+K_c/b in the model were readjusted and "Plate-index" mothod was established in order to be more accurate in the prediction of the sinkages of the tracks in the paddy fields.2. The relations between tractive force and soil shear strengthes:The tests of workability of the usual "Push-slip" model H=H_(max)(1+(K/iL)e~(-iL/k)-K/iL) were taken. After analysis of the track's tractive forces in the paddy fields,a new tentative"Pushslip" model has been proposed for testing. 通过自行设计的土壤参数测定仪测定,研究诸土壤参数与履带在水田土壤中的性能关系表明,国外现有的有关数学模型用在水田土壤应做修正。文中提出了修正“压力-下陷”模型中的系数K,以“圆盘指数”代替“圆锥指数”预计履带下陷深度;探索了新的“推力-打滑”模型。 When the twin-spool by-pass turbc-fan is being tested in the testing bed, if the engine performance does not conform to its design value we must readjust it. The exit area of the nozzle guide vanes of the high and low pressure turbines, the areas of the propelling nozzle for cold air and for hot gas should be readjusted. Hence it is necessary to find out a method for readjusting it. This paper introduces a method to calculate rapidly the readjusted values of these areas according to the parameters... When the twin-spool by-pass turbc-fan is being tested in the testing bed, if the engine performance does not conform to its design value we must readjust it. The exit area of the nozzle guide vanes of the high and low pressure turbines, the areas of the propelling nozzle for cold air and for hot gas should be readjusted. Hence it is necessary to find out a method for readjusting it. This paper introduces a method to calculate rapidly the readjusted values of these areas according to the parameters and performance data of the tested engine. 双轴涡扇发动机地面台架试车时,需要对发动机进行性能调试。可调截面积至少有高、低压涡轮导向器排气断面积,内、外函尾喷管最小截面积等四处。当发动机性能参数不符合设计要求时,如何调整这些截面积,是发动机试车中必须解决的问题。本文介绍的方法可以根据试车中所测得的数据迅速算出各个可调截面积所需要调整的数值。 A machining centre should have high positioning accuracy to ensure its machining precision. This paper introduces a reference model compound control system with magnetic scale measurement used for controlling NC machines. It is proved that this system runs stably and reliably, and can be readjusted conveniently. The comparision of the positioning accuracy has been made between the open loop control system and the reference model compound control system. The positioning accuracy from a definite point is... A machining centre should have high positioning accuracy to ensure its machining precision. This paper introduces a reference model compound control system with magnetic scale measurement used for controlling NC machines. It is proved that this system runs stably and reliably, and can be readjusted conveniently. The comparision of the positioning accuracy has been made between the open loop control system and the reference model compound control system. The positioning accuracy from a definite point is also compared with that from random points, when the reference model system is used. 加工中心机床必须具有高的定位精度以保证机床的加工精度。本文介绍了一种用来控制这种数控机床的磁尺测量模型参考复合控制系统,该系统不仅工作稳定可靠,而且调整方便。文中对用开环控制系统和复合控制系统时的定位精度进行了比较,并对比了用复合控制系统时的单点定位精度和任意点定位精度。
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