BL Band Limiting

Results show that the movement limiting frequency is 253 Hz,thus provide theoretical guide for the frequency setting value of ageing and testing experience,to avoid the abnormal movement with incorrect driven frequency.

分析了电控共轨供油泵进油电磁阀衔铁组件的运动过程,使用Simulink软件对衔铁吸合和回落过程运动时间进行了模拟计算,得到电磁阀部件运动的极限频率为253 Hz,为电磁阀部件在磨合和试验过程中控制系统设定的控制频率提供了理论依据,避免了因输入频率过高而导致的电磁阀部件运动不正常。

This paper deals with output power and frequency features of switched capacitor DC DC converter, suggests the concepts of frequency limitation and power limitation as well as the method to determine the limitation frequency, and further discusses the control methods for the switched capacitor DC DC converter.

探讨了开关电容 DC-DC变换器的输出功率及频率特性 ,提出了频率极限和功率极限概念 ,并得出了极限频率的确定方法 ,进而讨论了开关电容 DC-DC变换器的控制模式。

The ultimate frequency can be taken as an important criterion for evaluating RC beam bridge load capacity.

：通过对钢筋混凝土梁进行不同荷载等级重复静载和动载的交替试验，测出结构从完整到破坏不同荷载等级作用后的频率、振型和阻尼等模态参数，考查其与梁承载力的关系，得出梁频率与荷载等级之间的关系和极限频率值，建议将极限频率作为评定承载力依据，由频率和荷载等级关系的经验公式进行非线性外推求极限承载力，对钢筋混凝土梁桥进行承载力评定。