The effect of tribology factors on bearing vibration is studied experimentally. AR model and WPT are used to processing the normal arid abnormal signals. The results are as follows:1. The vibration of ball bearings is caused by the tribology action of contact pairs of ball and ring races and has the essential of tribo-dynamics. Any factors affecting the tribology characteristics of contact pairs will affect vibration and noise of bearings consequently.2. Vibration characteristics of bearing keep almostly unchanged with the increasing of axial load expecting the increasing of nature frequencies. When radial load increasing with axial load unchanged, nature frequencies keep unchanged but some new vibration peaks appears in the spectrum.3. Vibration amplitudes are damped and nature frequency are enhanced with sufficient lubrication. Vibration and noise of bearings increase obviously and roar can happen and the contact surfaces scratch slightly under insufficient and unclean lubrication state. Bearing will be disabled in a few minutes without any lubrication.4. Bearing vibration is unstable under low speed. With the speed increasing, the vibration become stable and natural frequencies increase slightly but the amplitudes increase apparently.5. Bearing vibration can be excited only by some harmonics ofwaviness without lubrication and by all harmonics with lubrication based on the theoretical analysis.6. The nature frequencies of ball bearings decrease with the increasing sizes. When international clearance increasing, nature frequencies decrease in radial and increase in axial and angular and the amplitudes increase in radial and decrease in axial and angular. When the number of balls increasing, nature frequencies increase and amplitudes decrease. When the pitch diameter increasing, axial nature frequency increase and others nearly keep no change. When outer race groove curvature radius increasing, nature frequencies increase in radial and decrease in axial and angular and amplitudes keep no change in radial and increase in axial and angular. When inner race groove curvature radius increasing, nature frequencies decrease and amplitudes increase.7. The distortion in amplitude and frequency components of bearing vibration signals picked up by the present probe measurement method is founded and right conclusions cannot be achieved by the signals. When accelerometer is rigidly screwed with steel stud onto a flat outer surface of a ball bearing, vibration signal can be got without distortion and the reliability of research on bearing vibration is assured.8. AR model is suitable for large samples of bearing vibration signals, square root of length of samples can be used as the upper limitation of order determination and the FPE order selection criterion is effective. Many advantages of AR spectrum are founded over the classical based on FFT.9. Time-Frequency analysis is necessary for abnormal noise of ball bearings. WPT overcomes the principle shortcomings of STFT and proved to be a best tool to process the abnormal signals.

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This article take the massive harmonics phenomenon as the language material, take the multi-gates discipline theory of the rhetoric, the language with study, the culture study, the glossary study, the dialectology, the psychology, the ethnology, the mark study, the embryology and so on as the instruction, uses classified, the induction, the comparison research technique, the discussion harmonics phenomenon production.

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Methods The effects of the reading error and the misalignment of the probes on the accuracy of measuring and all the harmonics of roundness were analyzed; The strategy and the algorithm for optimizing the parameters of the measuring system were proposed; The distribution and propagation patterns of the measured errors for all the harmonics of roundness were studied in detail; A software for correcting the errors caused by the measurement error of the angle positions of the probes and the sensitivity difference between three probes was presented.

分析了測頭讀數(shù)及角位置誤差對圓度各次諧波及圓周各點(diǎn)測量精度的影響www.丝袜.com；提出了三點(diǎn)法測量系統(tǒng)的優(yōu)化策略與算法；研究了三點(diǎn)法測量誤差的分布與傳遞規(guī)律热久久的免费毛片；提出了克服測頭定位誤差以及3個(gè)測頭的靈敏度不一致影響的軟件校正方法全免国内国外A片。

We research the spherical harmonics express of Lambert re- flection and propose a pure image based rendering method to synthesis image under arbitrary illumination condition based on spherical harmonics.

研究了朗伯反射的球調(diào)和表示，提出了一種基于球調(diào)和函數(shù)的任意光照目標(biāo)圖像生成方法色噜噜噜一二三区。

The paper first introduces the basic knowledge of power system harmonics, and points out the importance of studying harmonics.

本文首先介紹了電力系統(tǒng)諧波的基本知識玖性殴美，并指出了電力系統(tǒng)諧波研究的艱巨任務(wù)和重大意義。

Results show that dominant periods of relief variation can be derived by periodogram more obviously and easily than by harmonics analysis,while harmonics analysis can obtain relief variation simulation models as well as its periods.

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A new strategies for restraining harmonics are presented in the paper, the methods adopt the right carrier frequency and the sine wave superimposed a proper three-time harmonics to make it saddle-shaped wave, produce SPWM waveform to control the inverter switching devices for the on and off .

并提出了一種新的易于工程實(shí)現(xiàn)的諧波抑制策略色玖玖在线，該方法通過正確選擇載波頻率和在正弦調(diào)制波上疊加一個(gè)三次波使之成為鞍形波com.在线久久特，產(chǎn)生相應(yīng)的SPWM波形來控制逆變器開關(guān)器件的通斷從而改善輸出波形。

Simulation results of the circuit with filter indicate decrease of the harmonics in current of power supply, and the waveform is close to sinusoidal wave, which prove correctness of the solution to harmonics pollution.

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In this paper, a sort of recursive formulas of spherical harmonics integrals, which often appear in the gravitational gradient harmonic analysis, are deduced according to the recursive formulas between every other order of spherical harmonics and the trigonometric functions＇properties. And the calculated formulas on the recursive initialization also are brought forward.

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The simulated climate fields were decomposed with the spherical harmonics function and the corresponding spectral analysis was made,thus the spherical harmonics feature of global 500 hPa height and the sea level pressure in several truncations was investigated and the field changes on doubling CO2 were analyzed too.

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