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    Thrust correction
    1.
    发明授权
    Thrust correction 有权
    推力校正

    公开(公告)号：US07565269B2

    公开(公告)日：2009-07-21

    申请号：US11802507

    申请日：2007-05-23

    申请人： Robert N Parfitt ,  Martin R Turville ,  Maurice C Bristow ,  Stephen G Brown

    发明人： Robert N Parfitt ,  Martin R Turville ,  Maurice C Bristow ,  Stephen G Brown

    IPC分类号： G01M15/00 ,  G06F19/00

    CPC分类号： G01L5/133 ,  G01M15/14

    摘要： To determine free field thrust of a gas turbine engine, the gas turbine engine may be attached to a movable support, and operated at a selected engine operating point. The thrust applied by the engine to the thrust cradle is measured. The gas turbine engine intake momentum drag generated by airflow into the gas turbine engine intake, the thrust cradle drag force generated by airflow past the moveable support of the thrust cradle, the base drag generated as a result of accelerating nozzle ejector airflow, a pre-streamtube force related to turning of stream lines in the intake air path, a pre-stream tube force related to a bell mouth pull-off force are calculated. Forces due to forward anemometer plane and nozzle static pressures, and a nozzle exit buoyancy force are summed according to respective positive and negative values to determine the free field thrust at the selected engine operating point.

    摘要翻译： 为了确定燃气涡轮发动机的自由场推力，燃气涡轮发动机可以附接到可移动支撑件，并且在选定的发动机工作点操作。 测量由发动机施加到推力支架上的推力。 燃气涡轮发动机进气动量阻力由气流引入燃气轮机发动机进气口，推力支架产生的气流通过推力支架的可动支撑产生的拖曳力，由于加速喷嘴气流而产生的底座阻力， 计算与进气通道中的流线的转动相关的流动力，计算与喇叭口拉脱力相关的预流管力。 由于正向风速计平面和喷嘴静压力引起的力和喷嘴出口浮力根据相应的正值和负值相加，以确定所选发动机工作点的自由场推力。

    Gas turbine engine variable area exhaust nozzle
    4.
    发明申请
    Gas turbine engine variable area exhaust nozzle 有权
    燃气轮机发动机可变区排气喷嘴

    公开(公告)号：US20100107600A1

    公开(公告)日：2010-05-06

    申请号：US12585077

    申请日：2009-09-02

    申请人： Malcolm L. Hillel ,  Stephen G. Brown

    发明人： Malcolm L. Hillel ,  Stephen G. Brown

    IPC分类号： F02K1/18 ,  F02K1/00

    CPC分类号： F01D17/08 ,  F01D17/14 ,  F01D17/141 ,  F02C9/18 ,  F02K1/1207 ,  F02K3/04 ,  F02K3/06 ,  F02K3/075 ,  Y02T50/671

    摘要： A turbofan gas turbine engine (10) comprises a variable area exhaust nozzle (12) arranged at the downstream end of a casing (17). A control unit (66) analyses the power produced by the gas turbine engine (10), the flight speed of the gas turbine engine (1) and/or the altitude of the gas turbine engine (10). The control unit (66) configures the variable area nozzle (12) at a first cross-sectional area (70A) when the flight speed of the gas turbine engine (10) is less than a first predetermined value. The control unit (66) configures the variable area nozzle (12) at a second, smaller, cross-sectional area (70B) when the flight speed of the gas turbine engine (10) is greater than the first predetermined value and the power produced by the gas turbine engine (10) is greater than a second predetermined value. The control unit (66) configures the variable area nozzle (12) at a third, intermediate, cross-sectional area (70C) when the flight speed of the gas turbine engine (10) is greater than the first predetermined value and the power produced by the gas turbine engine (10) is less than the second predetermined value.

    摘要翻译： 涡轮风扇燃气涡轮发动机（10）包括设置在壳体（17）的下游端的可变区域排气喷嘴（12）。 控制单元（66）分析由燃气涡轮发动机（10）产生的功率，燃气涡轮发动机（1）的飞行速度和/或燃气涡轮发动机（10）的高度。 当燃气涡轮发动机（10）的飞行速度小于第一预定值时，控制单元（66）将可变区域喷嘴（12）配置在第一横截面积（70A）处。 当燃气涡轮发动机（10）的飞行速度大于第一预定值并且产生的功率时，控制单元（66）将可变区域喷嘴（12）配置在第二较小横截面积（70B） 由燃气涡轮发动机（10）大于第二预定值。 当燃气涡轮发动机（10）的飞行速度大于第一预定值并且产生的功率时，控制单元（66）将可变区域喷嘴（12）配置在第三中间横截面区域（70C） 由燃气涡轮发动机（10）小于第二预定值。

    Analysis Method
    5.
    发明申请
    Analysis Method 有权
    分析方法

    公开(公告)号：US20090271149A1

    公开(公告)日：2009-10-29

    申请号：US11887618

    申请日：2006-04-13

    申请人： Stephen G. Brown

    发明人： Stephen G. Brown

    IPC分类号： G06F15/00 ,  G06F11/00

    CPC分类号： G05B23/0254

    摘要： A method of analysing measured data, in relation to expected data, from a system which has a plurality of associated system variables, is provided, the method including the steps of: a) optimising an error function which relates said measured data to a predetermined number of the system variables adjusting the system variables; b) selecting a subset of the adjusted variables; and c) re-optimising the error function by adjusting only the variables in said subset. A method of identifying likely contributors to an error cause in measured data from a system which has a plurality of associated system variables, is also provided which uses the above method. A further method of analysing measured engine service or test data, in relation to expected data, from an engine has a plurality of associated system variables, is provided which includes the step of optimising an error function which relates said measured data to a predetermined number of the system variables by adjusting the system variables, wherein the error function is a sum of absolute variations and the step of optimising includes a least-absolutes optimisation.

    摘要翻译： 提供了一种从具有多个相关联的系统变量的系统中分析与预期数据相关的测量数据的方法，所述方法包括以下步骤：a）优化将所述测量数据与预定数量相关联的误差函数 的系统变量调整系统变量; b）选择调整变量的子集; 以及c）通过仅调整所述子集中的变量来重新优化误差函数。 还提供了一种使用上述方法来识别来自具有多个关联系统变量的系统的测量数据中的误差的可能贡献者的方法。 从发动机分析测量的发动机服务或测试数据相对于预期数据的另一种方法提供了多个相关联的系统变量，其包括优化误差函数的步骤，该误差函数将所述测量数据与预定数量的 系统变量通过调整系统变量，其中误差函数是绝对变量之和，优化步骤包括最小绝对优化。