Enhancing the Quality of Failed Planetary Gear Regions Using Intensity Transformation

2018 ◽  
pp. 121-127
Author(s):  
K. Santhi ◽  
Dhanasekaran Rajagopal ◽  
Somasundaram Devaraj ◽  
Nirmala Madian
Keyword(s):  
Planetary Gear

Study on the use of a non-circular gear train for the generation of Figure-8 patterns

2006 ◽  
Vol 220 (8) ◽  
pp. 1229-1236 ◽  
Author(s):  
J-Y Liu ◽  
S-L Chang ◽  
D Mundo
Keyword(s):  
Optical Fibre ◽  
Planetary Gear ◽  
Gear Train ◽  
Driving Mechanism ◽  
Programmable Logic ◽  
Planetary Gear Trains ◽  
Gear Trains ◽  
Motion Characteristics ◽  
Four Bar Linkage

Most popular polishing mechanisms for optical fibre end-face polishing machines are divided into three categories: planetary gear trains, linkages, and programmable logic controllers. To prevent the finished product from being scratched, it is expected that the grinding pattern prevents the lapping surface from repeatedly cutting the optical fibre end face in the same direction during the grinding process. For this reason, a polishing machine, whose grinding pad moves according to a Figure-8 path, is proposed in the present work. A pair of elliptical gears is designed to substitute the anti-parallel four-bar linkage and to drive one point of the coupler link along a Figure-8 pattern. However, owing the kinematic characteristics of elliptical gears, the velocity of the coupler point is highly variable during its motion, which is disadvantageous to the quality of grinding. Thus, in this study, a pair of non-circular gears is proposed as driving mechanism. By providing the driving elliptical gear with a suitable law of motion, it is possible to enable the velocity of the coupler point to be constant. A kinematic simulation has been performed to prove that the use of non-circular gears is effective in improving the motion characteristics of the Figure-8 path of motion, which is generated by elliptical gears.

A Study of Wind Generator Set Planetary Gear Transmission Dynamics Analysis

2010 ◽  
Vol 168-170 ◽  
pp. 2590-2594
Author(s):  
Jian Jie Zhang ◽  
Wen Lei Sun ◽  
Lei Lei Ma
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Planetary Gear ◽  
Scientific Basis ◽  
Gear Transmission ◽  
Transmission Dynamics ◽  
Dynamics Analysis ◽  
Wind Generator ◽  
Element Method

This paper on wind generator set planetary gear had a simple introduction, and finite element method was used on the planetary gear transmission dynamics analysis, the conclusion was drawn that the different planetary gear in the direction of the force and deformation, so as to improve the quality of the gear is designed to provide a scientific basis.

The Meshing Efficiency Analysis of Coupled Planetary Gear Reducer

2013 ◽  
Vol 479-480 ◽  
pp. 309-313 ◽  
Author(s):  
Long Chang Hsieh ◽  
Hsiu Chen Tang
Keyword(s):  
Planetary Gear ◽  
Efficiency Analysis ◽  
Reduction Ratio ◽  
Kinematic Design

This paper focus on the meshing efficiency of 2K-2H type planetary gear reducer. First, according to the concept of train value equation, the kinematic design of 2K-2H type planetary gear reducers is carried out. Then, based on the latent power theorem, the meshing efficiency equation of 2K-2H type planetary gear reducer is derived. According to the meshing efficiency equation, the meshing efficiency of 2K-2H type planetary gear reducer can be analyzed. The 2K-2H type planetary gear reducer has the following characteristics: 1. There is a problem of power circulation, 2.Larger reduction ratio makes less meshing efficiency, 3.For the same reduction ratio, larger value |ξ42| (|ξα|) will get better meshing efficiency, and 4.The better quality of gears (manufactured by grinding) will produce much better meshing efficiency.

scholarly journals Analysis of the shift quality of a hydrostatic power split continuously variable cotton picker

2021 ◽  
Vol 12 (1) ◽  
pp. 589-601
Author(s):  
Wanqiang Chen ◽  
Zhaorui Xu ◽  
Yeqi Wu ◽  
Yehui Zhao ◽  
Guangming Wang ◽  
...  
Keyword(s):  
Ride Comfort ◽  
Planetary Gear ◽  
Shift Quality ◽  
Acceleration Rate ◽  
Cotton Picker ◽  
Power Split ◽  
Action Time ◽  
Variable Transmission ◽  
The Cost

Abstract. In order to improve the ride comfort of a continuously variable cotton picker, the shift quality of the cotton picker is analysed. Firstly, the transmission principle of the hydrostatic power split continuously variable transmission (CVT) with a single planetary gear set is introduced; secondly, the shift dynamic model of the power train is constructed, and the key models are verified by experiments; finally, the influence law and mechanism of various factors in the shift qualities of a cotton picker are analysed. The results show that the increase in main circuit pressure will reduce the shift quality of the cotton picker; the influence of clutch-charging flow and acceleration rate on the shift quality of the cotton picker can be ignored; with the action time of the clutch delayed in a certain range, the shift impact first decreases slightly, then increases, and finally decreases; the increase in the cotton box weight can slightly improve the shift quality of the cotton picker but is at the cost of consuming more clutch-sliding energy. If different factors are evaluated together, the value of the main circuit pressure and charging flow should not be too large or too small. At the same time, the action time of a clutch to be disengaged should be delayed, and the action time of a clutch to be engaged should be advanced. The conclusions of this study can provide theoretical support for the controller development of a continuously variable cotton picker.

Immunoferritin localization of intracellular antigens in positively stained frozen sections

1978 ◽  
Vol 36 (2) ◽  
pp. 168-169
Author(s):  
K. T. Tokuyasu
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Thin Layers ◽  
The Other ◽  
Positive Staining ◽  
Frozen Sections ◽  
The Past ◽  
Ultrathin Frozen Sections ◽  
Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

Lithography below 100 nm

1983 ◽  
Vol 41 ◽  
pp. 96-99
Author(s):  
L. D. Jackel
Keyword(s):  
Spatial Distribution ◽  
Electron Beam ◽  
Electron Scattering ◽  
Electron Beam Lithography ◽  
Substrate Material ◽  
Local Electron ◽  
Electron Dose ◽  
Positive Resist ◽  
Exposure Process

Most production electron beam lithography systems can pattern minimum features a few tenths of a micron across. Linewidth in these systems is usually limited by the quality of the exposing beam and by electron scattering in the resist and substrate. By using a smaller spot along with exposure techniques that minimize scattering and its effects, laboratory e-beam lithography systems can now make features hundredths of a micron wide on standard substrate material. This talk will outline sane of these high- resolution e-beam lithography techniques.We first consider parameters of the exposure process that limit resolution in organic resists. For concreteness suppose that we have a “positive” resist in which exposing electrons break bonds in the resist molecules thus increasing the exposed resist's solubility in a developer. Ihe attainable resolution is obviously limited by the overall width of the exposing beam, but the spatial distribution of the beam intensity, the beam “profile” , also contributes to the resolution. Depending on the local electron dose, more or less resist bonds are broken resulting in slower or faster dissolution in the developer.

Convergent Beam Electron Diffraction

1978 ◽  
Vol 36 (3) ◽  
pp. 304-315
Author(s):  
G. Lehmpfuhl
Keyword(s):  
Electron Diffraction ◽  
Diffraction Pattern ◽  
Crystal Surface ◽  
Diffraction Spot ◽  
Crystal Thickness ◽  
Large Area ◽  
Electron Microscopic ◽  
Additional Information ◽  
Microscopic Investigations

Introduction In electron microscopic investigations of crystalline specimens the direct observation of the electron diffraction pattern gives additional information about the specimen. The quality of this information depends on the quality of the crystals or the crystal area contributing to the diffraction pattern. By selected area diffraction in a conventional electron microscope, specimen areas as small as 1 µ in diameter can be investigated. It is well known that crystal areas of that size which must be thin enough (in the order of 1000 Å) for electron microscopic investigations are normally somewhat distorted by bending, or they are not homogeneous. Furthermore, the crystal surface is not well defined over such a large area. These are facts which cause reduction of information in the diffraction pattern. The intensity of a diffraction spot, for example, depends on the crystal thickness. If the thickness is not uniform over the investigated area, one observes an averaged intensity, so that the intensity distribution in the diffraction pattern cannot be used for an analysis unless additional information is available.

Observability of Very Thick Specimen by Using Transmission Scanning Electron Microscope

1971 ◽  
Vol 29 ◽  
pp. 26-27
Author(s):  
K. Shibatomi ◽  
T. Yamanoto ◽  
H. Koike
Keyword(s):  
Electron Microscope ◽  
Image Quality ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Image Contrast ◽  
Objective Lens ◽  
Thick Specimen ◽  
Transmission Electron ◽  
Scanning Electron

In the observation of a thick specimen by means of a transmission electron microscope, the intensity of electrons passing through the objective lens aperture is greatly reduced. So that the image is almost invisible. In addition to this fact, it have been reported that a chromatic aberration causes the deterioration of the image contrast rather than that of the resolution. The scanning electron microscope is, however, capable of electrically amplifying the signal of the decreasing intensity, and also free from a chromatic aberration so that the deterioration of the image contrast due to the aberration can be prevented. The electrical improvement of the image quality can be carried out by using the fascionating features of the SEM, that is, the amplification of a weak in-put signal forming the image and the descriminating action of the heigh level signal of the background. This paper reports some of the experimental results about the thickness dependence of the observability and quality of the image in the case of the transmission SEM.

The Current Situation in Chemical Stabilization of Biological Materials

1972 ◽  
Vol 30 ◽  
pp. 132-133
Author(s):  
John H. Luft
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Osmium Tetroxide ◽  
Molecular Level ◽  
Cross Linking ◽  
Chemical Stabilization ◽  
Specimen Preparation ◽  
Sufficient Condition ◽  
Radio Telescopes

With information processing devices such as radio telescopes, microscopes or hi-fi systems, the quality of the output often is limited by distortion or noise introduced at the input stage of the device. This analogy can be extended usefully to specimen preparation for the electron microscope; fixation, which initiates the processing sequence, is the single most important step and, unfortunately, is the least well understood. Although there is an abundance of fixation mixtures recommended in the light microscopy literature, osmium tetroxide and glutaraldehyde are favored for electron microscopy. These fixatives react vigorously with proteins at the molecular level. There is clear evidence for the cross-linking of proteins both by osmium tetroxide and glutaraldehyde and cross-linking may be a necessary if not sufficient condition to define fixatives as a class.

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