At last , based on vehicle side - slip angle and yaw rate , 3 different kinds of vehicle handling stability controller are designed using variable structure control with sliding mode theory . at simulink simulation flat , do simulation experiment of the concept car model with the direct yaw moment control and without control ; and which control strategy should be apply in different specifically vehicle working conditions , how the vehicle velocity , steer characteristic , control parameters etc . impact the control quality have been studied 最后,运用滑模变结构控制理论,基于质心侧偏角和横摆角速度这两个控制变量分别提出三种具有针对性的控制策略,在simulink仿真平台上,对带有汽车稳定性控制器和不带汽车稳定性控制器的车辆模型进行了仿真研究;对不同工况下汽车稳定性控制策略的具体应用及车速、转向特性和控制参数等因素对控制品质的影响进行了研究。
And this numerical result is similar to the experimental result . then , the computation was played on different domain , rate of fibers and st numbers and got the conclusion that the farther the distance between the domain and the center of the pipe was , the more fibers " axis concentrated on the orientation of flow , while the rate of fibers and the st numbers had little influence on the distribution 然后通过考虑管道截面上的不同区域、改变纤维长径比和st数来研究他们对纤维偏角分布的影响，从而得出结果：随着计算区域从管道截面的中心向壁面的转移，纤维粒子的偏角分布逐渐集中于低角度；而纤维长径比和st数却对纤维的偏角分布没有明显影响。
It utilizes the computer digital image processing technology . and this system can measure the characteristic parameters automatically and quickly , such as luminous intensity , center of far light , corner of the close light . the advantage is high accuracy , good repetition and automatic measurement 此系统采用多维精密可调工作台，并利用计算机数字图像处理技术，以vc + +编程实现，达到了自动测量出被测校准器的发光强度，远光中心坐标，近光拐点坐标以及光轴偏角等特征参数的目的。
Secondly , based on cutting edge geometric model and machining mode of mk6335a grinder , the rake face with constant normal rake angle and flank face with constant orthogonal clearance angle models of ball - end cutters are discussed . the cutting geometry angle parameters are solved and analyzed . moreover , the tool paths models of wheel which grinding are builded and the post - processing technique for coordination transfer is studied 然后,基于刃口曲线模型、五轴数控磨床刃磨运动方式和微分几何的直纹面概念,本文推导与建立了具有等法前角的前刀面和具有等主后角的后刀面的球头立铣刀数学模型,并对球头立铣刀的刀具角度如刃倾角、主前角、法后角、主偏角等参数进行了求解与分析。
In the next part , after verifying the simplified computational method of turbulence , the movement of fibers in turbulent pipe flow was simulated by 3 - d integral method and simplified computational method of turbulence . it was found that the fluctuation of turbulence caused random of fibers " orientation and its distribution became broader as the re numbers increased 然后，在验证了湍流的简化方法的合理性后，利用三维分段计算方法和湍流简化方法模拟了大量纤维粒子在管道湍流内的运动，得出的结果为：湍流的脉动速度导致了纤维的偏角趋于无序，且随着re数的增加，纤维偏角的分布越来越趋于均匀。
Comparing and analyzing the experiment results , it is shown that : on the low adhesion road - control should be the primary as it can decrease the large side - slip angle ; on the high adhesion road - control is the best choice because it can restrain the oversized lateral acceleration ; on the mid - adhesion road , the right control strategy should be identified by the vehicle responses 对仿真结果的比较分析表明:在低附着路面上应以控制为主,以控制过大的质心侧偏角;在高附着路面上应以控制为主,从而抑制较大的侧向加速度;而在中等附着路面上,应根据实际车辆响应参数来决定到底应该采用何种控制策略。
Firstly , when the pipe flow was laminar , the movement of fibers was computed in the 2 - d force formulae that were deduced from the slender body theory and in 3 - d integral method . results revealed that angles between fibers " axis and the orientation of flow would concentrate gradually on a low number as the re numbers increased . that is , the axis of fibers would rotate toward the orientation of flow 首先，当管道内流动为层流时，分别利用从细长体理论出发得出的纤维二维受力公式和三维分段积分计算方法模拟了大量纤维在流场中的运动，然后在最终时刻统计了纤维的偏角分布，并得出相同的结果：随着re数的增加，纤维粒子的偏角逐渐集中于小角度，即纤维轴线方向越来越集中于流向，此结果与实验吻合较好。
By comprehensive considerate the intercoupling relationship between the side - slip angle and the yaw rate , the combine - control strategy ’ s predominance distinctness because it overcome the disadvantages of the large side - slip angle under the - control and can ’ t following the ideal yaw rate under the - control . vehicle possesses optimal control stability with the combine - control obviously 由于联合控制策略综合考虑了质心侧偏角和横摆角速度之间相互耦合的关系,克服了单独横摆角速度控制时质心侧偏角过大,以及单独质心侧偏角控制时对理想横摆角速度跟踪不好的缺点,因而优势明显,联合控制策略下的车辆具有最佳的操纵稳定性。
