The surface texture technology can improve the film–substrate adhesion and material properties by optimizing microstructure of diamond films on WC – Co substrate. Four types textures are fabricated cemented carbide (YG8) substrates using fiber laser processing, different structural deposited textured nontextured hot filament chemical vapor deposition technique. features mechanical tribological studied. results show that wave‐shaped structure shows best performance in all experiments. film...

A silicon nitride ceramic bearing has good self-lubricating characteristics. It still a operational status under the condition of lack oil. However, temperature distribution during its operation is unclear. To clarify thermal full-ceramic ball conditions, changing trend rolling friction between elements and channels with different accuracies analyzed using testing machine. The heat generation model based on material coefficient established, life test machine measures to verify accuracy...

Abstract The effects of the uncertainty angular misalignment on wear contact ball bearings in spindle system are investigated. model bearing raceways is derived based Archard model. caused by mounting error assumed to comply with normal distribution, Monte Carlo method used extract sample. Based model, spinning speed, pitch angle, and force elements each calculated. depth analyzed. results show that initial leads significant dispersion bearings, but degree related cases, position. Increasing...

Abstract As a new high-end bearing product, full ceramic ball bearings are favoured in variety. However, there have been few studies on the lubrication of bearings. The purpose this study is to reveal relationship between vibration and temperature rise angular contact lubricant viscosity, improve service life In study, effects viscosity silicon nitride under different axial loads rotation speeds were tested. Herein, mathematical model oil suitable for established film thickness, outer ring...

In this paper, we investigate the initial value problem (IVP henceforth) associated with generalized Kawahara equation [Z.Y. Zhang, J.H. Huang, Z.H. Liu and M.B. Sun, On unique continuation property for modified equation, Adv Math (China).45(2016),pp.80–88] as follows: data in Sobolev space Benefited from ideas of Zhang Well-posedness Ostrovsky low regularity, Meth Appl Sci. 39(2016),pp.2488–2513; Z.Y. Almost conservation laws global rough solutions defocusing nonlinear wave on ; Acta...

The removal mechanism of silicon nitride ceramic under high-speed grinding is studied in this article, and parameters are optimized. efficiency improved. diamond grains wheel simplified into the truncated octahedron cone to simulate process. When workpiece grinded by single-diamond grain continuously multi-diamond grains, effects depth speed on force surface morphology analyzed. Through experiment inner ceramic, data images were obtained. It proves that at process studying effect machining...

Fault diagnosis of rolling bearings can effectively prevent sudden accidents and is an important factor for the safe operation mechanical systems. However, traditional time–frequency analysis techniques cannot obtain fault feature information. In this paper, a flat variational modal decomposition denoising method based on wavelet transform proposed to solve susceptibility vibration signal noise interference easily features. method, first, series mother wavelets with different periods are...

During the operation of bearing in motor, induced current will inevitably be generated. The raceway damaged by current. In this paper, oil film thickness and capacitance are analyzed detail, relationship between thickness, rotational speed, load is obtained. increases with increase rotation speed decreases slightly load. minimum 0.4 μm 2.9 μm. influenced Hertz contact area, lubricant quality. It 1.9 pF 34.7 pF. A shaft test rig was developed. Based on analysis results, orthogonal tests set...

Working conditions such as lubrication, preload, and rotational speed have important influence on vibration temperature rise of the spindle motor. In this study, controlled variable experiments are carried out silicon nitride (Si 3 N 4 ) full‐ceramic ball bearing steel same type, signal characteristics motor tested analysed, by changing lubrication conditions, preloads, speeds Through research, it is found that increases, velocity Si under different preloads shows an overall increasing...

According to the redox ability of dopamine in a weak alkaline environment, silver nanoparticles were uniformly loaded on surface polydopamine-modified graphene oxide (Ag/PGO). The results show that base oil containing Ag/PGO exhibits better tribological property than oil. maximum decrease wear rate and friction coefficient at different temperatures amounted 68% 53.6%, respectively. tribofilm C, O, N, Ag exists plays an important role reducing increasing resistance. Molecular dynamics...

Trend of the high speed and efficiency machining has pushed continuous demand higher spindle power for center application. However, extremely will produce significant centrifugal force. Conventional steel spindles are not appropriate operation because their rotational inertia low damping ratio. Moreover, heat generation dynamic loading caused by rotation have been obstacles increasing limit in many conventional applications. In this study, a frequency fully ceramic motor equipped with ball...

For , the symmetric functions are defined by urn:x-wiley:dummy:mana201300073:equation:mana201300073-math-0003 where and non‐negative integers. In this paper, Schur convexity, geometric convexity harmonic of investigated. As applications, for other is obtained a bijective transformation independent variable convex function, some analytic inequalities established using theory majorization, in particular, we derive from our results generalization Sharpiro's inequality, give new Safta's...