在飞机飞行控制故障检测中,空速和攻角是完成飞行控制的重要参数,正确性直接影响飞机的飞行安全。大气数据系统故障检测常采用多系统硬件冗余和系统建模解析冗余的方法,而硬件冗余增加了硬件成本与系统复杂度,解析冗余需要将待检测的空速和攻角作为量测估计飞机状态,故障信息会导致空速和攻角的估计偏差影响检测可靠性。针对上述问题,提出了一种基于扩展卡尔曼滤波的空速和攻角估计方法,根据飞行动力学与控制原理进行建模,利用机载导航系统和飞机固有的模型参数完成飞机的空速和攻角估计,并分辨出大气数据系统的故障数据。上述方法不需要增加新的硬件设备,也不需要空速和攻角作量测,是一种经济可靠的故障检测方法。仿真结果显示,提出的故障检测方法能够对大气数据系统空速和攻角的故障进行有效检测。

为深入分析延迟决策与有限理性对航空公司动态价格竞争复杂性的影响,综合运用了延迟决策与非线性动力学理论,构建了基于延迟决策的航空公司动态价格竞争模型,对模型进行了理论分析与数值仿真,研究了不同市场参数下的航空公司复杂的动力学行为.研究结果表明:较大的延迟决策权重可以扩大系统稳定域范围、缩短系统到达均衡的时间;系统处于不稳定状态时,引入延迟决策机制对航空公司更有利;一方引入延迟决策机制,会出现竞争对手“搭便车”而获取额外利润的现象;为权衡航空公司市场表现,关键是确定合理的延迟决策权重.

A multi-dimensional and hierarchical airport service quality model was proposed to extend the service quality measurement model and broaden the vision of the airport service quality evaluation .It formed an airport service quality measure-ment scale.The scale of the airport service quality was simplified by two steps .An empirical study was carried out for the multi-dimensional and hierarchical airport service quality model by using 304 valid sample data obtained from the questionnaire survey . The results show that the model fits the data well .Thus it could be used as an overall assessment of domestic airport service qual-ity.The reliability and validity of airport service quality scale was confirmed as well .

In order to carry out quality evaluation of air service effectively, according to the airline service characteristics, the paper proposes and tests a sub-order model of airline service quality. The empirical results show that we can confirm all three levels of the proposed sub-order structure where a passenger's perceived airline service quality includes second-order factors of interaction, environment, process and outcome qualities, and each second-order factor further has its third-order factors. The empirical results also show that airline service quality scale is valid and reliable.

根据皖电东送1 000kV特高压交流输电工程试运行期间的调试试验要求,设计了架空地线的感应电压采集系统,论述了系统的结构功能和设计原理,并分别在输电线路瞬时人工接地故障和不同输送功率工况下采集了其架空地线的瞬态感应电压水平和稳态感应电压水平.试验结果表明,该系统运行稳定、状态良好,具有较好的实用性、可靠性与精确性.

In order to provide theoretical support and practical guidance for the study of domestic civil air -port passenger satisfaction ,the paper combined with the domestic airport industry characteristics ,aimed at airport passengers ,and researched that the impact factor of airport passenger satisfaction was the corporate image ,service quality ,safety factors and so on .The paper constructed the structure equation model of air-port passenger satisfaction , formed airport passenger satisfaction scale , and carried on the empirical re-search .The results showed that the service quality and safety factors have a direct positive impact on pas-senger satisfaction ,and passenger satisfaction has a significant direct impact on passenger loyalty .

The planar capacitance sensor is specially designed for the process of the test which can induce the changes of the water in the building envelope.The working principle of the sensor is given.In order to solve the interference problem of small capacitance in dectection,a sensor with protection electrode and the singal transmission technology of actuation electric cable are used.With the improved micro-capacitance measurement circuit based on charging/discharging principle,the optimization is given to the relations of test depth and sensitivity of the sensor.The system of moisture test in the building envelope is based on embedded microprocessor unit.The experimental results show that the system can be used for moisture test of the building envelope in a certain depth at the scene.

Aimed at the request of the water content of the construction wall in different depth,the method of optimizing the structure and the size of capacitive sensor is strdied.A series of detectors with different detecting depth are developed by simulation and experiment.The construction wall is divided into some layers along the direction of depth,and the relationship between water content and the output of different sensors is fitted by means of experimental data.Through combination measurement,the water content in each layer can be obtained.Experimental results show that the distribution of the water can be calculated from the equations,and the test accuracy is decided by the amount of sensors.

At present,the common methods used for measuring water content are microwave method,infrared ray method and electrical capacitance method.The capacitance sensor has wide application.It is characterized by high resolution,rapid response speed and simple structure.In this paper,the size and structure of the uniplanar scattering-field capacitance sensors are optimally designed by simulation and experiment for test depth and testing feature with guard electrode for improving the anti-disturbance capability.A new uniplanar scattering-filed capacitance sensor for measuring water in building inclosure is designed based on improved charge/discharge capacitance measuring circuits.This kind of sensor has wide test depth and high sensitivity.

In allusion to the complication of processing dynamic weighing data,the expirical mode decomposition(EMD) method is used to obtain the average residue.The experiments concentrate on two-axle vehicle.The mean residue of front,the one of rear axle,the velocity,the ascending slope and descending slope of signal on the plate entirely are inputed into the RBF network.The system composed by vehicle and weighing plate is non-linear.The static weight signals are used for simulating relative real value.The relative error is decreased from(2.1 %)to 1.4 %.The simulation results show that higher precision can be achieved instead of simple average.

It is complicated to process weighing data during the weighing-in-motion of vehicles.Considering the influence of their motion parameters on axial weighing signal,we use the radial basis function(RBF) network.We build the models of the whole vehicle and do network training for three types of vehicles in terms of their weights i.e.big,medium and small weight with the contradiction between the generalization capability of the network and its fitting accuracy considered.We extract the type features of the vehicles using their plan views.In order to diminish the influence of the vibration during the vehicles′ movement on the measurement accuracy,we carry out the empirical mode decomposition(EMD) of their signals when they completely reach the weighing platform to obtain their mean residue values.The mean residue values of front axle and rear axle,average velocity,the ascending slope and descending slope of the signals of the vehicles that ascend or descend the platform are used as input of the RBF network.Their measurement parameters are input into different neural networks according to their types.Their static measurement results are treated as relative real value.The results show that higher precision of measurement can be achieved by inputting the mean residue value of the EMD signal on the platform than inputting its mean value.

1 引言软件测试过程中,测试用例的生成是软件测试的关键.目前,测试用例的生成主要靠手工完成,因此测试效率低下,软件成本居高不下.为此,迫切需要开发一些测试用例的自动生成工具,提高软件测试效率,降低软件成本,保证软件质量,提高软件测试的自动化程度.