| 1. | The results show that it is effective and feasible to diagnose faults of diesel engine by mean of un - disassembly using surface vibration signal
研究表明，利用柴油机表面振动信号对其进行不解体故障诊断是可行的。 |
| 2. | The results show that it is effective and feasible to diagnose faults of diesel engine by mean of un - disassembly using surface vibration signal .
研究表明，利用柴油机表面振动信号对其进行不解体故障诊断是可行性的。 |
| 3. | Then , local - wave ( lw ) method is imported especially for solving questions about nonlinear and non - stationary of diesel surface vibration signals
然后，针对柴油机系统的非线性和表面振动信号的非平稳特性，引入局域波分析方法。 |
| 4. | Fractal dimension not onlg can be used to detect the knock threshold from the cylinder pressure signal , but also can be used to detect the knock threshold from the engine surface vibration signal
利用分形维数不仅能够自缸压信号中有效检测出爆震边缘，而且能够自振动信号中有效检测出爆震边缘。 |
| 5. | The cylinder block surface vibration monitoring of diesel cylinder liner wear is introduced , and the cylinder block surface vibration under the condition of exceeding the high - degree wear of cylinder liner is monitored
摘要研究了柴油机缸套磨损故障的机体振动监测，包括缸套破坏性磨损故障时的机体振动。 |
| 6. | The influences of the rotation of drops forced by orthogonal acoustic waves and the surface vibration on undercooling are analyzed and the conclusion that ultrasound can suppress the undercooling level has been drawn
分析了声场对过冷度的影响，认为声波引起的样品表面振动以及试样的绕轴自转都会抑制过冷度的进一步提高，不利于深过冷条件的获得。 |
| 7. | In succession , fractal is imported especially for solving questions about nonlinear and non - stationary of diesel surface vibration signals . a formula with variation has been set to calculate the fractal dimension of the vibration curve
接着，针对柴油机系统的非线性和表面振动信号的非平稳特性，引入分形分析方法，利用变换法计算振动曲线的分维数。 |
| 8. | A rectangular box simulating the axial box of the lathe tool is manufactured ; experimental measurements of the surface vibration on the rectangular box and the acoustic field around the rectangular box corresponding to firstly a series of a homogeneous excitation and secondly two iii independent white noise excitations are taken in a semi - anechoic chamber . taking the vibratory properties as input , the properties of the sound field are calculated by the evsbpm and the sdsbpm respectively . the effectiveness and reliability of the evsbpm and the sdsbpm for the calculation of acoustic radiation problem is further verified from the comparison of the calculated results and measured ones
第五章设计加工了一模拟机床主轴箱的长方箱体，在半消声室环境下，分别对其在单点处一系列简谐激励作用下和两点处的独立白噪声激励作用下的振动及其辐射声场进行了实验研究和分析计算，通过计算结果和实测值之间的比较，进一步验证了改进体积源边界合肥工业大学搏士学位论文点方法和统计分布源边界点方法计算振动声辐射问题的有效性和可靠性。 |
| 9. | In succession , through testing , analyzing , diagnosing to diesel surface vibration signals for long time and experience piling up , a new practicability way for identifying cylinder pressure is discovered , and validated in brief . meanwhile , the experimental results confirm the validity and practicability of this way
接着，通过对柴油机表面振动信号的长期进行测试、分析、诊断及经验的积累，提出了一种实用型气缸压力识别的方法，并作了简单理论验证，该方法在柴油机故障诊断中起到了积极的作用。 |
