本文提出了一种新的抑制抖振的方法——改进型边界层法，较好地满足抑制抖振和控制精度两个方面的要求。
The dissertation developed an improved method, which is known as improved boundary layer solution, the better demand for chattering reduced and control precision can be achieved.
由于它能使滑动模态实现希望的频率整形，故能有效地抑制抖振。
Frequency shaping of sliding mode can be achieved and chattering can be reduced well via this new metliod.
抖振分析的准确性，取决于抖振力和结构模型的准确描述。
Naturally, the accuracy of buffeting analysis lies on the buffeting force spectrum and the model of the structure.
因此，解决桥梁抖振问题是桥梁界人士共同关心的事。
Therefore, to solve the problem about buffeting of bridge is concerned by people engaged in bridge engineering.
桥梁的抖振分析，有频域和时域两大类方法。
The buffeting of Bridges can be analyzed in frequency domain and in time domain.
桥梁风荷载很复杂，在桥梁初步设计阶段没有必要进行精确地抖振分析。
It is impossible and costly to carry out detailed buffet analysis in the bridge conceptual phase and many short span bridge designs because the wind load on bridge is complicated.
提出一种抑制抖振的新方法。
A new method of reducing chattering in sliding mode control is proposed.
准确预测抖振响应的一个重要环节是对抖振荷载的恰当描述。
Describing the buffeting gust load properly is an important section to predict the buffeting response.
对于风力作用下所引起的桥梁主梁抖振反应，通常采用全桥风洞试验或断面模型风洞试验配合数值分析进行评估。
Generally, either the full bridge model wind tunnel test or section model wind tunnel test with analytical procedure is used to evaluate buffeting responses of Bridges.
理论分析和仿真表明，连续时间系统变结构控制确实具有一定的鲁棒性，并且能够实现抖振控制与系统控制的部分解耦。
The theoretical reasoning and simulation results show that continuous time VSC system can be more robust than PID system, and chattering control an be partially decoupled with system dynamics.
同时对变结构控制律中包含的符号函数项，采取了用饱和函数来代替的方法以尽可能地抑制变结构系统所带来的抖振。
The symbolic function in the variable structure control is replaced by the saturation function to reduce the chattering which is brought by the variable structure control system.
通过系统状态预估及对状态运动的分析，设计了可以完全消除系统抖振的滑模控制器。
After state preestimate and state movement analysis, a discrete sliding mode controller which can essentially avoid the chattering phenomenon is designed.
针对滑模变结构控制的抖振问题，提出一种用于异步电动机矢量控制系统的积分滑模变结构速度控制方法。
A strategy of speed control for vector-controlled asynchronous motor drive system using sliding mode variable structure control with an integral action was proposed.
然而滑模变结构控制带来的高频抖振是其应用到实际系统中的障碍。
However, the chattering with high frequency in sliding mode control systems is barrier for the application to the practice engineering problems.
之后，设计了双曲正切函数的鲁棒补偿项，从而得到一种没有抖振的平滑控制输入。
Then, a robust compensation term is developed in form of hyperbolic tangent function to obtain a smooth control input without chattering phenomena.
考虑风与膜结构的耦合作用，研究索膜结构在顺风向和垂直向风作用下的抖振响应规律及特性。
Considering wind-structure interaction, cable-membrane structure buffeting analysis under horizontal and vertical wind has been carried out in this study.
为了削弱控制器所带来的抖振，运用模糊逻辑理论对控制器的不连续项进行了修正，从而得到了一种新的基于模糊逻辑的变结构控制器。
To weaken the chatter from the controller, the theory of fuzzy logic was used to modify the discontinuous term. Based on fuzzy logic, a variable structure controller was gotten.
分析结果表明，在大跨度悬索桥中，多模态效应和模态耦合效应对主梁的竖向和扭转位移抖振响应有显著的影响。
It is shown that the multimode and mode coupled effects on the vertical and torsional buffeting responses of the bridge deck are quite obvious.
负载推力观测器和扰动前馈补偿的设计有效地削弱了变结构控制产生的抖振。
The chattering of the VSC system is effectively minimised by designing a load thrust observer and a disturbance feed forward compensation.
此外，增加前悬吊下控臂后衬套的刚性系数、阻尼系数与方向盘的转动惯量，均可有效减少因煞车抖振所导致的方向盘振动。
Moreover, increasing the stiffness and damping of lower control arm rear bushing and the steering column inertia can effectively reduce the shimmy caused by brake judder.
提出采用准定常气动刚度与基于试验的非定常气动阻尼进行气动修正的大跨度桥梁抖振计算新模型。
Put forward a new method for long-span bridge buffeting analysis which using quasi-steady aerodynamic stiffness and unsteady aerodynamic damping based directly on wind tunnel test.
气动导纳函数是桥梁抖振分析中的重要气动参数。
Aerodynamic admittance was an important aerodynamic factor in the analysis of buffeting of Bridges.
气动导数是大跨桥梁结构颤振和抖振分析中确定颤振临界风速和抖振响应的重要依据。
Flutter derivatives play very important roles for determining the flutter critical wind speed and buffeting responses of long-span Bridges.
在桥梁抖振精细时程分析基础上，模拟出构件的应力时程，并以南京长江二桥为实例对公式进行了验证。
Based on the accurate bridge buffeting analysis of time history, the time history of components is simulated and numerical example is presented to testify this method.
探讨了利用非平稳随机过程理论和少量的实际风速记录模拟自然风，并以此作为桥址处的自然风用时域抖振分析方法对某系杆拱桥进行抖振时域分析。
Then by taking the simulation results as the natural wind in the bridge address, the buffeting analysis in time domain is carried out for an arch bridge of linking pole.
基于测试的气动参数和模拟的脉动风速场，给出了车辆和桥梁静风力、抖振力及自激力的时域表达式。
Based measured aerodynamic parameter and simulated wind speed field, time-domain expression of static wind load, buffeting load and self-excited load for bridge and vehicle are introduced.
选择适当的动态不连续控制律保证了系统状态在有限时间到达滑模面，并有效的削弱了抖振。
An appropriate control law was selected that forces the system states to reach the sliding manifold in finite time and has low chattering in the sliding motion.
文中简单介绍了半模和全模两期抖振试验的主要结果，提及了研究中存在的不足和将来研究应改进或加强的工作。
Test results of a half-model and a complete model, deficiency of the research, and the follow-on improvements are also introduced.
文中简单介绍了半模和全模两期抖振试验的主要结果，提及了研究中存在的不足和将来研究应改进或加强的工作。
Test results of a half-model and a complete model, deficiency of the research, and the follow-on improvements are also introduced.
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