| 1. | When the velocity is changed , in order to change the amount of seeding transplant , single - chip microcomputer adjusts the frequency of electromagnet
当行走速度发生改变时，单片机改变方波的频率，经驱动电路改变电磁铁的吸合频率(激振频率) ，以达到调节摆秧量的目的。 |
| 2. | It is proved that when frequency is low , there can be significant discrepancies between them , with frequency increasing , the simplified solutions converge to the new more rigorous one
研究表明它们与本文严格解的差别主要限于低频段，随激振频率的提高，不同解将趋于一致。 |
| 3. | Under the same conditions , the reflective peak of pile toe in time domain in the former is smaller than in the latter and decreases gradually with the increase of exciting frequencies
研究表明，长径比越小，两者区别越显著，同样条件下，前者的时域底反峰值小于后者，且对激振频率有依赖性，频率越高，底反峰值越小，而后者不能反映这一现象。 |
| 4. | The optimized combination of parameters is listed as followed : the amplitude of excitation force is 150 newton ; the frequency of excitation force is 38 hertz ; the inclination and stiffness of spring is 64 degree and 56 newton per millimeter
分析得出振动参数的最优组合方案为：激振力f取150n ，激振频率山取38hz ，弹簧倾角及刚度k分别取64 、 56n mm 。 |
| 5. | No bad effect on concrete strength is found within a certain range of amplitude . the ultimate loads of vibration members are not lower than those of normal ones am , when vibration frequency is below 40hz and maximum vertical displacement is within 0 . 2mm
在一定的振幅范围内，对混凝土强度没有不利影响，当激振频率在40hz以下，最大竖向位移振幅在0 . 2mm以内，受振与非振构件相比较，其破坏荷载值没有降低。 |
| 6. | This dissertation also presents the equivalent stiffness and damping models and the nonlinear hysteresis and saturation model of a kind of the mr damper developed by the experimental testing and modeling in order to describe accurately characteristics of the mr damper
建立了磁流变阻尼器的等效刚度和等效粘性阻尼系数与施加电压、激振频率和振幅的关系以及能精确表示磁流变阻尼器的力学特性的非线性滞回模型。 |
| 7. | The performance of vibration and movement of seedlings is validated in the whole vibration plate simulation . an orthogonal experiment is designed for analyzing the effect that the four parameters ( f , co , a , k ) act on horizontal and vertical velocity of seedlings
首先验证虚拟模型的振动性能与物理原型基本相符，进一步采用正交试验，考察四个因子(激振频率山、激振力幅值f 、弹簧刚度k及弹簧倾角)对钵苗推送速度的影响。 |
| 8. | In this paper , the theory for lateral vibration of pile foundation with consideration of shear deformation of pile is established , and the influence of the ratio of pile length to its diameter , the ratio of pile stiffness to soil stiffness and dimensionless frequency were studied systemically
本文建立了一整套考虑桩体剪切变形的桩基水平振动分析理论，并较系统地研究了桩的长径比、桩土刚度比、激振频率等因素对桩基水平动力响应的影响。 |
| 9. | 5 . based on the solutions developed herein , the main features of the interaction between visco - elastic layered soil and an integral pile or a multi - defective pile are systematically analyzed . the influence on the vibration properties caused by soil modulus , the degree of pile defects , and the length and location of the defects are discussed , and many important conclusions are drawn
5 、利用所得解，对成层土中完整桩、变截面、变模量桩的振动特性进行了较系统的分析，并重点讨论了土层模量、桩身缺陷程度、埋身、缺陷段长度、激振频率等对桩项复刚度、桩顶反射波曲线、导纳曲线的影响，得到了许多重要结论。 |
| 10. | Base on review of existed study and application in suppressing cable vibration in the world , technique of mitigating cable vibration with viscous damper and mr damper has been investigated in this dissertation , and the main contents and progresses in form of summary are as following : 1 the motion differential equations of the cable - damper system are formatted , which take into account these factors , such as the inclined angle , sag , stiffness etc . coupling motion between cable and deck is studied with analytical and numerical method . numerical results show that large amplitude vibration of cable with beat rhythm will occur when exciting frequency of deck equals two times modal frequency of cable
本文在对国内外斜拉索振动控制研究与应用现状进行综合评述、分析的基础上，针对上述问题进行了深入研究，具体的研究内容和取得的成果包括： 1 、建立了斜拉索-阻尼器系统运动方程，对拉索与桥面的耦合振动作了分析和研究，数值结果显示当桥面激振频率等于某阶拉索模态频率的两倍时，很小的初始扰动将引起拉索的大幅振动，并呈现拍振的特征，与实测的拍振信号一致。 |
