Bevel tip position and corneal damage during phacoemulsification Recently, Faramarzi et al. reported on bevel-up versus bevel-down phaco tip during phacoemulsification. We disagree with the authors that it was the first study to consider this subject. Other authors have published studies considering the consequences of phaco needle bevel position on corneal endothelial cells during phacoemulsif...

In this paper, a double-side milling method on spiral bevel gear is proposed. First, according to the tooth taper processed by method, influence of dedendum angle was researched. Taking cut parameters into comprehensive consideration, geometric were designed through inclination root line and modified mean point in which machine setting calculated selected. Only met meshing equation, error press...

To improve the meshing performance and increase bearing capacity service life of spiral gear pairs, a cutterhead approximation machining method based on controlling geometric topological deviations was proposed to solve problem where line contact bevel gears with tapered teeth depth cannot be machined by cutterheads. First, mathematical model conjugate flank established, comparison between toot...

Abstract The paper presents a structure diagram of slot trencher when planting garden, consisting frame on which working sections, bevel gear reducer and support wheel stands are fixed. On the section there is shaft with body - disk cutter. It made in form disc teeth, one cutting edge each tooth straight other parabolic. parabolic elements fixed knives two parts. A along periphery; guide entire...

A three-dimensional (3D) finite element (FE) model was developed to simulate the motion modes of the human middle ear structures. The model was based entirely on 3D reconstruction obtained from micro Computed Tomography (microCT) imaging. We solve the acoustics-structure interaction problem using COMSOL Multiphysics. Our results show that at low frequencies, the classical hinging motion is domi...

This paper reports the study of four time-frequency transforms applied to vibration signals and presents a new metric for comparing them for fault detection. The four methods to be described and compared are the Short Time Frequency Transform (STFT), the Choi-Williams Distribution (WV-CW), the Continuous Wavelet Transform (CWT) and the Discrete Wavelet Transform (DWT). Vibration data of bevel g...

This article describes the structure and the working principle of the blind hole drilling device, by application in the production practice proves its feasibility. At present, we commonly used electrical discharge machining and welding method to solve the problem. However, these methods have the low processing efficiency, low manufacturing precision and high cost defect. This paper developed an...