KEYWORDS: Inspection, Metrology, Manufacturing, Teeth, Data processing, Data acquisition, Control systems, Electronics, Design for manufacturability, Instrumentation engineering
Generally the profile deviations are measured through the generating method, the coordinate method and the meshing method by using gear measuring instruments (GMI) and coordinate measuring machines (CMM) in metrology room. But high-speed inspection of gear profile deviations at industrial scale manufacturing is a problem. To solve this problem, a novel measurement principle of profile deviations based on the double-flank rolling test with rack probe is introduced in this paper, and also the measuring system was given. The new methods will meet the demands of the high-speed gear measurement in shop floor.
The In-line Gear Measuring Machine (GMM) based on the double-flank gear rolling test with many degrees of freedom
was developed to inspect the gears fast in workshop. The radial composite deviations and tangential deviations can be
evaluated during one inspection. To evaluate the measuring machine, the repeatability test is the most critical. Many
factors should be notified in the repeatability test, such as mechanism accuracy, clearance between bore and arbor,
accuracy of master gear and the gear to be inspected, spring stiffness and damping coefficient, stability of the air
pressure, measuring force, starting point of measurement, speed and rotation direction of gear, clean and no stain, etc..
After taking account of the above factors, the repeatability test of GMM was implemented.
Radial composite deviations can be assessed by the traditional double-flank gear rolling tester, but it is hard to obtain
tangential deviations (helix, taper, etc.) of the produced gear. To solve this problem, a measuring principle of the
double-flank gear rolling test with many degrees of freedom was investigated in order to inspect radial composite
deviations and tangential deviations during one inspection. This paper presents the measuring model, the definition of the
deviations and the evaluation method, including the radial composite helical slope deviation and the radial composite
helical taper deviation. An In-line Gear Measuring Machine (GMM) was developed based on this measuring principle to
meet the demand of high-speed inspections in mass-production gear workshops.
Magnetic resonance image (MRI) has provided an imageological support into the clinical diagnosis and prediction of
Alzheimer disease (AD) progress. Currently, the clinical use of MRI data on AD diagnosis is qualitative via visual
inspection and less accurate. To provide assistance to physicians in improving the accuracy and sensitivity of the AD
diagnose and the clinical outcome of the disease, we developed a computer-assisted analysis package that analyzed the
MRI data of an individual patient in comparison with a group of normal controls. The package is based on the principle
of the well established and widely used voxel-based morphometry (VBM) and SPM software. All analysis procedure is
automated and streamlined. With only one mouse-click, the whole procedure was finished within 15 minutes. With the
interactive display and anatomical automatic labeling toolbox, the final result and report supply the brain regional
structure difference, the quantitative assessment and visual inspections by physicians and scientific researcher. The brain
regions which affected by AD are consonant in the main with the clinical diagnosis, which are reviewed by physicians.
In result, the computer package provides physician with an automatic and assistant tool for prediction using MRI. This
package could be valuable tool assisting physicians in making their clinical diagnosis decisions.
This paper presents for the first time the concept of anisotropy of measurement for complex curved surfaces. Based on the theory of differential geometry, the relation between measurement error and micro-structure & form of curved surfaces is studied, which is existence proof of anisotropy, and also the basic rule of anisotropy is clarified. Through anisotropic analysis of the measurement for complex curved surfaces, series of conclusions relating to that are obtained. Those conclusions have not only theoretical meaning but also far-reaching practical value on the following aspects: precision instruments design, error budget, measuring method design, and etc.
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