Identification of dynamic axle loads on bridges is an inverse problem of structural mechanics, and a notable feature of which is the presence of ill-posed problem.
移动荷载识别属于结构动力学逆问题的范畴,而逆问题的一个显著特点就是存在不适定性。
However,there was different identification accuracy and immunity to measured noise and to the ill-posed problems of the system equation if different preconditioned matrixes were used.
仿真结果表明,在绝大多数工况下,预处理共轭梯度法均能精确识别桥梁移动荷载,但不同预优矩阵对测量噪声及识别方程的不适定性有不同的抵抗能力,且对预处理共轭梯度法的收敛速度、识别精度也存在不同影响;合理选取预优矩阵能够有效提高桥梁移动荷载识别预处理共轭梯度法的精度和效率。
Begin with to study the ill-posed problems which is resulted by Δt in dynamic loads identification techniques,a reasonable criterion of determining Δt has been proposed;and the corresponding formulas are also given.
为此从研究反分析问题的特点,即从分析其特有的不适定性出发,提出了新的Δt的确定原则,并根据这一原则推导了相应的Δt的计算方式。
The reconstructed image quality of electrical capacitance tomography (ECT) system is heavily affected by the ill-posedness problem, so the condition number of the sensitivity matrix must be decreased.
电容层析成像(ECT)系统的不适定性问题严重影响重建图像质量,为此必须减小灵敏度矩阵的条件数。
Nonlinearity and ill-posedness are the bottle-neck in inverse problem s theoretical studies and engineering applications.
非线性和不适定性是反问题理论研究和工程应用的瓶颈问题,对反问题非线性和不适定性的有效处理方法进行了总结。
A regularization method was introduced to solve the ill-posedness for ship maneuvering,as a result,the system is stable for the simulation data with 2% noise and 5% noise and the method is suitable f.
为解决上述不适定性问题,提出采用遗传算法与正则化方法相结合求解船舶操纵运动系统反问题。
Experimental Investigation on Instabilities of Steam-Water Two-Phase Flow in Large L/d Inclined Parallel Upward Smooth Pipes;
大L/d倾斜并联光管汽-液两相流不稳定性实验研究
The studies show that different types of the oscillation modes of the pulsational instabilities arise from the coupling of radial perturbations to azimuthal perturbations and the vertical perturbations.
在不引入粘滞律的条件下详细讨论了弱磁化等温吸积盘对各种扰动形式所表现的不稳定性。
The tank was of comparably small thickness and the turbulence subsequent to the instabilities was pseudo-3D.
翻转水箱具有相对较小的厚度,翻转后产生的湍流是虚三维的(Pesdo-3D),瑞利泰勒不稳定性起动了湍流混合过程及前锋的行进。
Chemical unstability and pharmacological activity of hyperforin;
贯叶金丝桃素的化学不稳定性及药理活性
Tackling Unstability of Light Source and Zero Drift of Photoelectro Devicesin Optical Fiber Sensors;
光纤传感器中光源不稳定性及光电器件零漂的处理方法
On the unstability of exponentially harmonic maps;
关于指数调和映射的不稳定性
resistive rippling instability
电阻性皱纹不稳定性
relativistic synchrotron instability
相对论性同步不稳定性
universal Alfven-wave instability
普遍阿尔芬波不稳定性
ion-ion streaming instability
离子－离子流不稳定性
modified two stream instability
变形的双流不稳定性
electrohydrodynamics instability
电流体动力学不稳定性
Rayleigh-Taylor instability
瑞利－泰勒不稳定性
Rayleigh-Benard instability
瑞利－贝纳尔不稳定性
drift-cyclotron resonance instability
漂移回旋共振不稳定性
collisionless tearing mode instability
无碰撞撕裂不稳定性
uncertainty of exchange rates
汇兑行市的不稳定性
microinstability of plasma
等离子体微观不稳定性
Variational approach for linear growth rate of Rayleigh-Taylor instability with continuous density profile
瑞利-泰勒不稳定性线性增长的密度梯度致稳
Study on Analysis of the Probability of Slope Instability in the Stability
不稳定概率法分析边坡的稳定性研究
conditional instability of the second kind
第二类条件性不稳定
a temperamental motor.
一台性能不稳定的马达
the quality of being steady--regular and unvarying.
稳定、规则、不变化的属性。
Researches into the NCS Stability of Certain and Uncertain Time-delay
确定和不确定时延的NCS稳定性研究