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engine response
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  engine response
The discussion also considers multiple engine response and distance and budget constraints as well as operational problems, such as closing or relocating existing stations.
      
The results show significant improvements for T41 and for PRSHPC without perceivable effects on the overall engine response time.
      
The range delivers excellent engine response, low speed performance and machine driveability.
      
This generally acquiescent ISP and search engine response is quite predictable.
      
SM2 is not a measured output but is provided for evaluation of the engine response near the fan stall line.
      
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For the damping of speed oscillation of hybrid electrical vehicle (HEV) engine, this paper founded a PID controller according to the relationship between electrical throttle control (ETC) positions, engine speed and engine torque. The PID is implemented in the hybrid control unit and its parameters are tuned based on the engine response features. The experimental results prove that the overshoots and settles time decrease greatly with respect to the original one.

根据发动机电控节气门开度-转速-转矩关系,建立了混合动力汽车(HEV)用发动机转速比例-积分-微分(PID)控制模型,并根据发动机转速响应特性,对模型参数进行了整定.试验表明,发动机转速PID控制器具有良好的控制品质,提高了HEV用发动机的转速特性.

The mathematical model of turbofan engine transient process with thrust vectoring nozzle was established.The effects of thrust vectoring angle and angular velocity of vectoring on turbofan engine operation were investigated.The results show that the gas temperature at turbine inlet has different peak value at different thrust vectoring angle.The peak value increases with the increase of thrust vectoring angle. No significant change of the engine response to fuel step was found.

建立带矢量喷管的涡扇发动机动态数学模型。研究了矢量喷管偏转角和偏转角速度对涡扇发动机工作的影响。研究结果表明 ,不同的矢量喷管偏转角速度对发动机涡轮前燃气温度会产生不同温度峰值 ,而且温度峰值随矢量偏转角速度增大而增大。而在一定的不同矢量角作用下 ,发动机的阶跃响应过程调节参数无明显变化

Using the full-flow staged combustion cycle LH2/LOX engine as an example,the engine response characteristics were investigated.The non-linear dynamic mathematical model of the full-flow staged combustion cycle was presented.The variable step Runge-Kutta algorithm for solving the ordinary differential equations was developed.The immunity strategy algorithm and Runge-Kutta algorithm were combined to form this new algorithm.Applying the variable step Runge-Kutta algorithm,the transient performance of the...

Using the full-flow staged combustion cycle LH2/LOX engine as an example,the engine response characteristics were investigated.The non-linear dynamic mathematical model of the full-flow staged combustion cycle was presented.The variable step Runge-Kutta algorithm for solving the ordinary differential equations was developed.The immunity strategy algorithm and Runge-Kutta algorithm were combined to form this new algorithm.Applying the variable step Runge-Kutta algorithm,the transient performance of the full-flow staged combustion cycle was simulated.Calculating results show that variation of the propellant inlet pressure makes little impact on engine performance parameters,and the engine will transit to a new stable state.The parameter transition curves are smooth.When the engine thrust is adjusted in a small range within a short period,the parameter transition curves are also reposeful.But when the adjusting range becomes large,the parameter transition curves will fluctuate acutely.Thus,when large range adjusting is required,the time of adjusting should be lengthened or the adjusting should be divided into adequate steps.

以全流量补燃循环氢氧发动机系统为研究对象,对其的动态响应特性进行了研究。建立了描述全流量补燃循环发动机动态特性的非线性数学模型,将免疫策略算法同龙格-库塔法结合起来,提出了求解含有隐式项的常微分方程组的变步长龙格-库塔方法,并应用该方法对全流量补燃循环发动机系统的动态响应特性进行了仿真计算。计算结果表明,当发动机在某一个稳定工况工作时,发动机入口推进剂压强的变化对发动机性能参数的影响不大,发动机的参数都能比较平稳的过渡到一个新的稳定工况;当发动机在短时间内进行小范围的推力调节时,发动机参数的过渡过程的曲线也比较平稳,但是当在短时间内进行大范围推力调节时,参数的过渡过程的曲线振动比较剧烈,因此应当在进行大范围推力调节时,应当对调节时间进行适当延长,或者分级进行推力调节。

 
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