为提高自动炮武器系统发射动力学模型精度,基于实弹射击试验建立支持向量机响应面,对仿真模型进行了修正。应用有限元分析方法建立了双炮身管结构和炮塔结构有限元模型,基于武器系统各部件间的约束关系建立了步兵战车刚柔耦合发射动力学模型;基于相同边界条件,选取自动炮连发射击中典型结构的振动特性搭建了测试系统并进行了实弹射击试验;针对仿真数据与试验数据误差,引入支持向量机响应面方法对步兵战车刚柔耦合发射动力学模型进行了修正。修正结果表明,基于支持向量机响应面的模型修正方法大幅提高了自动炮武器系统发射动力学模型的精度,更准确地反映了自动炮射击过程中的机构动态特性。

The automatic gun firing dynamics model was built up and the simulation model was updated by use of the support vector machine response surface method based on the actual firing experiment so as to analyze the influence factor of firing precision.The finite element models of the gun barrel structure and turret structure were established by means of finite element analysis method,and the rigid-flexible cou-pled firing dynamics models of the infantry combat vehicle were set up based on the restricted relationship between components and joints of the weapon system.The test system was established and the actual fir-ing experiment was carried out by use of picking up the typical structure vibration characteristics in the burst firing of automatic gun based on the same boundary conditions.Aimed at the errors between the simula-tion data and the test data,the automatic gun firing dynamics model was updated.The updating results showed that the model updating method can increase the precision o

基于同一混沌信号光注入下两个1550 nm垂直腔面发射激光器(VCSELs)中两对应线性偏振模式之间的混沌同步,提出了一种可实现信息的长距离双向双信道光纤混沌保密通信的系统模型,并对该系统的同步、双向双信道通信以及光纤信道对信息传输的影响等性能进行了相关仿真研究.结果表明：在由驱动混沌激光器所产生的同一混沌光注入下,两响应激光器中对应的两线偏振模式之间均可实现高质量的等时混沌同步,且驱动激光器与两响应激光器间的同步系数较低；基于两响应激光器之间对应线偏振模式的高质量混沌同步,可实现双向双信道混沌通信；采用单模保偏光纤(或色散位移保偏光纤)作为通信信道,2.5 Gbit/s信息在传输60 km (或200 km)后解调信息的Q因子能保持在6以上.

Based on the chaos synchronization between two pairs of corresponding linear polarization modes in two 1550 nm vertical-cavity surface-emitting lasers (1550 nm-VCSELs) subject to optical injection of common chaotic signals, a novel bidirectional and dual-channel long-distance chaos secure communication system is proposed. The chaotic synchronization characteristics, bidirectional dual-channel communication performance, and the influences of the fiber channel on the message transmission are numerically investigated. Results show that, driven by a common chaotic signal generated from a driver VCSEL (D-VCSEL), two pairs of responding linear polarization modes in two response 1550nm-VCSELs (R-VCSELs) can be synchronized completely and isochronally. Meanwhile, the synchronization coefficients between the two pairs of responding linear polarization modes in D-VCSEL and R-VCSELs are low. Based on the high quality chaos synchronization between two pairs of responding linear modes in two R-VCSE

针对旋转靶弹低空飞行姿态难以快速调整以及参数摄动的问题,基于内外环的双滑模变结构方法,设计了旋转靶弹的双通道控制器。基于非线性模型,对靶弹快速变化的攻角和侧滑角以及慢速变化的高度和偏航距离分别设计了一种积分型滑模面,并采用指数趋近律减轻系统的抖振,利用Lyapunov稳定理论证明其稳定性。非线性仿真结果表明,该设计控制方法能快速准确响应控制指令,且在参数摄动时表现出较强的鲁棒性。

Aimming at flight attitude difficult to quickly adjust and parameter perturbation problems when rotating target missile fly at low altitude, inner and outer rings of the method of double SMVSC is adopted to design dual?channel controller for rotating target missile. Based on the nonlinear model of rotating target missile, the paper designs an integral sliding surface for rapidly changing attack angle and sideslip angle and slowly varying height and yaw distance respectively, buffeting is reduced by using index reaching law. It is proved to be stable by using Lyapunov stability theory. The designed control method is proved that it can quickly and accurately respond to control commands and exhibit strong robustness when parameter perturbate.

益生菌发酵乳中的活菌数是保证其功能特性的关键因素,为提高益生菌发酵乳中的活菌总数,以干酪乳杆菌和双歧杆菌复合菌种为试验对象,以发酵过程中的pH值和吸光度平均值OD值为试验指标,在单因素试验的基础上,利用Box-Benhnken中心组合试验和响应面分析法研究了接种量、益生菌接种比例、发酵温度、葡萄糖添加量以及大豆多肽添加量对发酵乳pH值和活菌数的影响,并建立了复合益生菌发酵模型。响应面优化试验结果表明复合益生菌发酵的最佳工艺条件是脱脂乳乳固体质量分数为12%,接种量为6%,干酪乳杆菌:双歧杆菌接种体积比为3:1,葡萄糖添加量为2.9%,大豆多肽添加量为0.8%,发酵温度为34℃,在此条件下OD预测值为1.076,验证试验得到实际OD值为1.087,与理论预测值相比,相对误差为1.0%。发酵乳最大活菌数为4.1×1011cfu/mL,与已有研究相比,活菌数提高了1～2个对数级。在4℃条件下贮藏21d后,发酵乳的活菌数仍然保持在4.7×1010cfu/mL。研究结果为工业化生产高活菌数的益生菌饮料提供参考。

The viable probiotic count is the key factor to functionality of fermented milk. It is very important for the milk industry to improve the number of viable bacteria in its final products. Lactobacillus casei and Bifidobacterium were blended using them as a starter culture for fermented milk to achieve a high viable probiotic count. Lactobacillus casei and Bifidobacterium were studied and a high density culture technology of Lactobacillus was applied to increase the number of viable bacteria in the fermentation system. Determination of the absorbance method was used to assess the viable count of probiotics in fermented milk in which the calcium ion would combine with salt under alkaline conditions to make fermented milk dispersed evenly in a solution state. Ethylenediamine Tetraacetic Acid (EDTA) was selected as a chelating agent to chelate the calcium ion in the fermented milk, and to make the solution clarify. The OD value of the bacteria did not change significantly after entering th

针对路面结构响应动力学理论模型构造实验模型。经模型试验与数值仿真相结合方法研究移动荷载下路面动力学响应。设计含车辆模型及分布刚度路面模型的车路模型试验系统,其中车辆模型包括谐振源车辆模型及1/4车模型。利用模型试验与数值仿真方法分别对移动简谐激励及冲击激励作用的分布刚度路面动力响应进行研究。数值仿真与试验结果对比表明设计的模型及实验方法可近似模拟车-路耦合作用及路面动力响应。

In order to test the accuracy of the dynamic response of pavement,calculated based on the theoretical model,a new test rig was proposed.With the help of experimental and numerical simulation,the dynamic response of pavement under moving load was investigated.The vehicle-pavement test rig includes a vehicle model and a distributed stiffness pavement-roadbed model,and the vehicle model was simplified as a quarter of resonance source vehicle model. The dynamic response of distributed of stiffness pavement under moving resonance load and shock excitement were analysed respectively.The results show that the designed test rig is usable,and the experiment results can meet closely with the numerical results.