| 1. | Optimal control theory often dictates that nonlinear time varying control law be used , even if the basic system is linear and time - invariant
即使系统是线性定常的，最优控制理论通常给出非线性时变控制律。 |
| 2. | As well as added mass coefficient and damping ing coefficient was obtained in unsteady condition . however , the latter results are less satisifyied than the former results
在定常的情况下，计算的结果比较理想；而在非定常的情况下计算结果还有待进一步的改进。 |
| 3. | The ice accretion is considered a quasi - steady process in which the accretion is calculated layer by layer , assuming a constant flow field during the accretion of each new ice layer
在对结冰进行数值模拟时，结冰被当成一个准定常过程，即把冰看成是一层一层增长的，假定每一层内冰增长时流场是定常的。 |
| 4. | In order to obtain transient mathematical model as vectoring deflection which is very important in engineering and valuable in theory , three - dimensional and unsteady flow fields must be researched
由于气流在喷管流动中具有复杂的三维非定常的特征，因此，建立其动态数学模型有着更为重要的工程及理论价值。 |
| 5. | This paper discusses the positive periodic solution and the almost periodic solution to dimensional predator - prey model with prey supplements by using the differential inequality , and its stability under disturbances in the shell
摘要对于食饵有补充具有功能反应类的非定常的捕食食饵模型，利用微分不等式讨论了周期解的存在性及其全局吸引性、概周期解的存在性及其在壳扰动下的稳定性。 |
| 6. | The mechanical model of panel flutter considering thermal effect is established by the use of von karman large deflection strain - displacement formulations , quasi - steady first - order piston theory aerodynamics and quasi - steady thermal stress theory . ( 3 )
采用vonkarman大变形应变?位移关系、基于一阶活塞理论的气动力公式以及准定常的热应力理论建立了考虑热效应时复合材料壁板颤振的力学模型。 |
| 7. | On the basis of some conclusion , we have proved that the schemes have second - order convergence accuracy for the time discretization , a two - level method for resolving the nonlinearity in finite element approximation of the stationary conduction - convection problems is presented
在某些已有结论的基础之上，我们证明了这种格式对于时间离散上的二阶精度。提出了一种解决定常的热传导-对流问题的有限元近似中出现的非线性问题的两层方法。 |
| 8. | According to the distinction of scanning and staring ir imaging systems , researches and simulations on two - point nuc ( tpnuc ) are made respectively . as most of algorithms presume thermal imaging sensors " response is linear , they cannot avoid the effect of response nonlinearity , leaving a residual special noise
一般温度定标校正法都建立在探测元的响应是线性定常的假设之上，故无法避免响应非线性的影响，校正后仍存在剩余非均匀性。 |
| 9. | Based on the navier - stockes equation , the finite difference method was applied to variance the simplified n - s equation on cylindrical coordinate system . then , 3 - d model of the spiral flow locally generated in circular pipe with steady and axial - symmetry condition was founded . the ordinary iterative method of gauss - seidel was induced
太原理工大学硕士学位论文本文以局部起旋条件下的圆管螺旋流为模拟对象，从以速度和压强为自变量的微分方程一navier一5tokes方程出发，利用有限差分法对柱坐标系下简化后的n一s方程进行离散，建立定常的、轴对称的三维计算模型。 |
| 10. | In this paper , a nonlinear galerkin mixed element method , a galerkin / petrov - least squares - type mixed finite element method and a nonlinear galerkin / petrov - least squares mixed element method for the stationary conduction - convection problems are presented and analyzed , respectively . we discuss the existence , uniqueness and convergence
本文分别给出了定常的热传导-对流问题的非线性galerkin混合元法、 galerkin / petrov最小二乘混合元法和非线性galerkin / petrov最小二乘混合元法，并证明这些方法的解的存在唯一性和收敛性。 |
