By virtue of some known results of the existence on at most one or two limit cycles of the Lienard systems,using the theory of rotated vector field,we study the number and relative positions of the limit cycles of the n-demensional differential system =y,=-(hxn-1+δ)y-(xn-x)(h>0),where n is a positive integer greater than 1.
利用已有的关于Lienard系统极限环存在性和唯一、唯二性的诸多结论,结合旋转向量场理论,研究了n次微分系统x。
Moreover, the generalized rotated vector field, constructed in the present paper, is used for obtaining the existence condition of period solutions for another system.
然后,利用构造的一个广义旋转向量场得到另一系统的周期解的存在条件。
In this paper by means of three types of exampls,we investigate the distinction problem of what types of bounded separatrix cycles the limit cycle of quadratic system will become,when it is extending in rotated vector field as the parameter varies monotonically in a suitable direction.
本文通过三种类型的例子研究了在旋转向量场中二次系统的极限环随参数按适当方向单调变化而扩大时,将变成何种类型的有界分界线环的判别问题,而且得出二次系统极限环存在的精确参数区间的三个推论。
By application of the theory of rotating vector field ,this paper obtains the sufficient conditions for limit circle of the second system of Ⅲ a=0 x=-y+x+lx 2+mxy+ny 2(n=-1,0<l<1) y=x(1+y), that exists in origin periphery.
利用旋转向量场理论得到Ⅲa=0 类二次系统 x =-y+δx+lx2 +mxy +ny2 y =x(1 +y) (n =- 1 ,0
The Stability of Limit-cycles in a Spinning Vector Field;
一旋转向量场中极限环的稳定性及变化规律
Development of Rotary Arc Gap-Switch in Axial Magnetic Field;
轴向磁场控制的旋转电弧开关的研制
Measurement of the swirling flow field in the circular pipe with the diameter 300mm×3240mm by LDV
D300mm×3420mm圆管内旋转流流场的LDV实验测量
Rotating Machinery Failure Diagnosis Based on Support Vector Machine;
基于支持向量机的旋转机械故障诊断
rotating-field electromagnetic pump
旋转(磁)场电磁泵
Study on Trajectory Measurement Technology of the Point-the-Bit Rotary Steerable Drilling System
指向式旋转导向钻具钻孔轨迹测量研究
Measurement of electron beam energy from Mini-LIA by solenoid-induced beam rotation
螺线管磁场旋转束流法测量Mini-LIA电子束能量
A Study on the Revolving Field Direction Discrimination Laser Doppler Vibrometer
旋转场辨向层栅激光多普勒测振系统研究
Magnetic circuit modeling and field analysis for opposite-rotation dual mechanical ports PM machine
异向旋转双机械口永磁电机磁路建模与场分析
Development of Pseudorandom Circumrotatory ELF-EMF Rodent Control System
极低频伪随机无定向旋转磁场驱灭鼠系统研制
Research on Bending Rotation Test of Rotation Shaft in Point the Bit Rotary Steerable System
指向式旋转导向系统旋转轴弯曲旋转试验研究
rotarydisplacement meter
“旋转”排量式仪表
The rotational inertias of uniform rotational rigid surfaces about the around axis
均质旋转面绕旋转轴转动的转动惯量
A turning to the right.Used especially of the plane of polarization of light.
向右旋转向右旋转，尤指光的偏振面
Mechanical vibration of large rotating machines with speed range from 10 to 200 r/s-Measurement and evaluation of vibration severity in situ
GB/T11347-1989大型旋转机械振动烈度现场测量与评定
Males and females within our species rotated their fields in counterbalance to one another.
我们物种中的雌雄以相反方式旋转能量场。
By turning this knob to the right you can amplify the sound from this radio.
把这个旋扭向右转你就可以增大收音机的音量。
Gyroscope-Free Inertial Measurement and Lateral Thrust Control System Design for a Rolling Missile
旋转导弹的无陀螺测量方法及直接侧向力控制