参数变化

In this paper the dynamics characteristics are analyzed theoretically at first. According to the unique configuration and mechanics characteristics, the mechanics model and kinetic differential equation of the half-tracked air-cushion vehicle are established. Algorithm of mechanics and lifting-state parameters are put forward and analyzed. And variation ranges of the driving state parameters are obtained and the corresponding influence factors are analyzed. The further qualitative studies on control model are carried out.

因此，本文首先从理论上分析了半履带式气垫车的动力学特性，根据半履带式气垫车的独特结构和力学特性，建立了半履带式气垫车的力学模型和相应的运动微分方程，提出并分析了在纵摇与升沉运动时，半履带式气垫车的力学参数和垫升状态参数的计算方法，得到了在行驶过程中各运行状态参数的变化规律，并分析了相应的影响因素，进而对控制对象模型进行了定性研究。

After hundreds of discharge experiments under the conditions of different capillary geometrical parameters, Ablation capillary materials, the comprehensive experimental character of free injection plasma generator is worked out.

通过在不同毛细管几何参数、不同消融毛细管材料、不同PFN放电参数、不同脉冲叠加方式条件下的百余次放电实验，得出了自由喷射等离子体发生器主要放电特征参数在不同条件下较全面的实验变化规律。

It is found that these parameters have great changes under the misfire operating mode. Hence, the threshold values corresponding to these parameters are determined to diagnose the misfire operating mode. The corresponding fault diagnostic program is written.

对这两个参数在各工况下的值进行了详细的分析后，发现这两个参数在失火工况下有较大的变化，故对这两个参数确定相应的阈值来诊断失火故障。

In addition, the past 20 years, no change in the standard steam trap is still in use in the 20th century set the standard 80, test method does not improve, or replace with low parameters of high parameters, which parameters of the steam traps for high-test is unscientific.

除此之外，近20年来，蒸汽疏水阀的标准没有变化，仍然沿用20世纪80年代制定的标准，试验方法没有提高，还是用低参数替代高参数，这对于高参数蒸汽疏水阀的试验是不科学的。

After building the mathematical model of marine impellent system by means of MATLAB,this paper adopted traditional PID algorithm and used the genetic algorithm to regulate the parameters of PID controller for making simulation and analyses on the speed control system of certain ship.

利用MATLAB建立了船舶推进系统的数学模型，采用传统的PID算法，并利用遗传算法整定PID参数，对某船航速控制系统进行了仿真分析。为反映真实情况，文章分别仿真了船舶在无干扰、5%、10%及20%干扰情况下航速及螺旋桨转速等参数的变化，仿真结果显示遗传算法整定PID参数用在船舶航速控制系统上是可行的

According to Floquet theory and transition curves of Mathieu equation, two different modified strained parameter methods are compared on precision of periodic solutions. The effect of viscous damp on parametrical rolling stability is analyzed with the modified strained parameter method.

根据Floquet理论和方程的稳定性过渡曲线，比较2种不同改进变形参数法的求解精度，利用改进变形参数法来分析黏性阻尼变化对参数横摇稳定性的影响。

Generalized negative binomial distribution was successfully fitted to all the snail data. The parameters of GNBD from the same bottomlands in different seasons changed differently, and parameters of GNBD from different bottomlands in the same season were not similar even if their snail density were close.

不同季节同一滩地间的广义负二项分布参数的变化不一致，同一季节不同滩地广义负二项分布的参数估计结果即使在钉螺密度相近的情况下也不相近，钉螺生存环境的微小差异可以通过广义负二项分布的参数灵敏反映。

The soil parameter is the basic parameter in the soil engineering design, but the variety of soil parameter have the very strong region characteristic.

岩土参数是岩土工程设计的基本参数，而岩土参数的变化具有很强的地域特征。

Aiming at the big time-delay,big burthen fluctuating and mutable characteristic of the controlled object,combining Smith predicator with PID controller,the BP neural network tuning Smith-PID controlling policy is presented.

针对大时滞时变对象，把Smith补偿控制原理和PID参数的自适应调整方法结合起来，提出了基于BP神经网络整定Smith PID控制算法，即在Smith预估补偿控制系统中，利用BP神经网络在线自学习整定PID参数，使PID参数实现最佳的非线性组合，以适应对象特性的变化，从而克服了常规PID算法不适应大时滞系统控制和常规Smith算法过于依赖模型精度的缺陷。

DIPSO incorporates the dynamic mutation, multi-subpopulations methods of IPSO, and changes the heights and the positions of the peaks by variable parameters and chaotic model. This algorithm uses multi-subpopulations to search for the highest peak in order to track the dynamic environments. Furthermore, DIPSO apperceives the changes of the environment by tracking the fitness value of the global optimal particle.

该算法是IPSO的动态版本，沿用了IPSO的动态变异策略、多子种群策略，在算法运行的过程中分别对环境进行参数设定型动态变化和混沌模型动态变化，利用多子种群分别对多个峰进行搜索，很好地实现了算法的追踪性能；对全局最优粒子进行实时跟踪，利用其适应度值的变化来发现环境的改变，并以此来引导群体对环境变化的感应。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。