| 1. | Application of square demodulation analysis in fault diagnosis for mechanical signal
平方解调分析原理及在机械信号故障诊断中的应用 |
| 2. | To extract incipient fault feature of mechanical signal , a new method to construct wavelet according to the fault characteristics is presented
摘要针对机械信号早期故障特徵的提取问题，提出了一种根据故障特徵波形的特点来构造相应小波的方法。 |
| 3. | The results demonstrate that for ica the correct preprocessing according to signal structure contributes to extracting features from mechanical signals effectively
研究结果表明，根据信号结构选择预处理的方法十分重要，正确的预处理可以使独立分量分析有效地提取机械信号中的特徵。 |
| 4. | Its control precision must fit a certain extent standard . now , proportional hydraulic valve which developed from the general hydraulic valve is applied in ali kind of control scopes . it uses proportional electromagnetic iron to change the electron signal into mechanical signal instead of the manual adjuster or general switch electromagnetic iron
现在工业生产中得到广泛应用的比例液压阀多是在普通液压阀的基础上，采用廉价而可靠的比例电磁铁作为电-机转换元件，把电气控制信号转为机械信号，以代替原阀内的手动调节器或普通开关式电磁铁。 |
| 5. | The engineering result confirms that the proposed method is better than the other wavelet methods for matching fault feature of mechanical signal , and the weak impact - rub fault caused by the axis misalignment and rotor imbalance of a key rotating machine in an oil refinery are desirably extracted
工程振动信号分析表明，同其他类型的小波相比，用提升方法构造的小波能更好地匹配机械信号故障特徵波形，因此较理想地提取出了某炼油厂重催机组转子不平衡、轴系不对中和轻微碰摩的故障特徵。 |
| 6. | An automated de - noising algorithm based on the energy of wavelet packet not donoho ' s threshold algorithm is established . a gear feature vibration signal extraction method using the wavelet packet energy is proposed , which can separate gear meshing vibration , noise vibration and gear fault vibration signal from the original gearbox case vibration signal . basis pursuit ( bp ) algorithm is introduced into the filed of mechanical signal de - noising and feature extraction for the first time
第三章摆脱了donoho的阈值消噪思想，从能量的角度建立了基于小波包的自动消噪算法；提出基于小波包能量分布的齿轮故障特征信号提取方法，可以将齿轮啮合振动信号、干扰振动信号以及故障冲击振动信号从原始齿轮振动信号中分离出来；首次将基追踪消噪算法引入到机械故障信号的消噪与特征提取上，通过对齿轮故障信号的消噪，表明了它的有效性，并对影响该方法实际应用效果的因素进行了全面的分析，同时也指出了该方法存在的局限性。 |
