Proposal of a Computational Algorithm for Calculating Material Ratio of Surface Texture

2021 ◽  
Vol 11 (1) ◽  
pp. 22
Author(s):  
Hirokazu Machida ◽  
Ichiro Yoshida ◽  
Yuki Kondo
Keyword(s):  
Quality Control ◽  
Surface Texture ◽  
Computational Algorithm ◽  
Computing Time ◽  
Surface Profile ◽  
Efficiency Improvement ◽  
Iso Standard ◽  
Calculation Time ◽  
Ratio Curve ◽  
Improved Algorithm

The material ratio curve (hereafter referred to as MRC) of ISO 13565-2 and ISO 4287 is widely used in industrial fields. The computational algorithm of MRC proposed in ISO has a problem of long calculation time, because of a method of slicing the roughness profile. Therefore, in this study, a sort method was proposed as a computational algorithm for time reduction. However, depending on the form of the surface profile, the algorithm of the proposed sort method has a problem in that calculation errors occur. Therefore, in this paper, we report a new improved algorithm that solves this problem. In this paper, a new and improved algorithm for calculating MRC has been researched and developed. The proposed algorithm in this paper succeeded in reducing the computing time to derive MRC compared with the calculating algorithm of MRC proposed in the ISO standard. This algorithm is expected the efficiency improvement of quality control.

scholarly journals 331 Efficient quality control methods for genomic and pedigree data used in routine genomic evaluation

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 50-51
Author(s):  
Yutaka Masuda ◽  
Andres Legarra ◽  
Ignacio Aguilar ◽  
Ignacy Misztal
Keyword(s):  
Quality Control ◽  
Large Scale ◽  
Computing Time ◽  
Academic Research ◽  
Snp Markers ◽  
Pedigree Information ◽  
Memory Usage ◽  
Pedigree Data ◽  
Genomic Evaluation ◽  
Data Set

Abstract Quality control and consistency tests on genotypes and historical pedigree data are applied in a routine genomic evaluation and academic research. The quality control takes more time to finish as more genotypes become available, and this step is a bottleneck in a pipeline of routine evaluation. For the efficient quality control, we have developed several algorithms and a computer program to support for large-scale, biallelic, single nucleotide polymorphisms (SNPs). The program is designed to detect unsatisfactory genomic markers and individuals in terms of call rate, marker allele frequencies, duplicate samples, and Mendelian inconsistency in the large genomic data with the pedigree including millions of individuals. Duplicated genotypes can be detected using a set of markers. An SNP genotype is packed into a 2-bit representation in memory that enables bitwise operations with parallel computing to efficiently perform the quality control. The software optionally checks the inconsistency of pedigree information. We compared QCF90 with preGSf90, a preceding program, in terms of memory usage and computing time using a data set including 200,000 genotyped individuals, 50,000 SNP markers per individual, and 216,500 pedigree individuals. In total running time, QCF90 was approximately 6 times faster than PREGSF90 (307 s vs 2075 s) while the memory usage was 30 times less (2 GB vs 75 GB) using only 1 thread. The QCF90 program performed better in speed as more threads were used. A check for genomic duplications took 159 s with 16 threads when 5,000 genotypes were compared with 200,000 genotypes using 2500 SNP markers. The new tool is useful in the routine genomic evaluation and the academic research in which both the genotypes and the pedigree information are used. The QCF90 executable is available at http://nce.ads.uga.edu with a user manual.

An Average Wavelength Parameter for Surface Metrology

1972 ◽  
Vol 5 (3) ◽  
pp. 95-101 ◽  
Author(s):  
R C Spragg ◽  
D J Whitehouse
Keyword(s):  
Quality Control ◽  
Surface Texture ◽  
Surface Metrology ◽  
Average Height ◽  
Additional Parameter ◽  
Texture Measurement ◽  
International Standard ◽  
Arithmetic Average ◽  
Average Wavelength

The new International Standard for the assessment of surface texture is based on the Arithmetic Average Height Index Ra. This parameter, although extremely valuable for quality control in manufacture, takes little or no account of the openness or closeness of the texture. Recently an additional parameter, the Average Wavelength Λa has been defined which is wavelength conscious and which supplements the information given by Ra. This paper shows how this new parameter can be derived and measured, and gives some practical examples of the application to surface texture measurement.

Two-Dimensional Adaptive-Surface Elasto-Plastic Asperity Contact Model

2006 ◽  
Vol 128 (4) ◽  
pp. 898-903 ◽  
Author(s):  
Tianxiang Liu ◽  
Geng Liu ◽  
Qin Xie ◽  
Q. Jane Wang
Keyword(s):  
Computing Time ◽  
Surface Profile ◽  
Contact Problems ◽  
Contact Model ◽  
Computational Time ◽  
Real Contact Area ◽  
Asperity Contact ◽  
Relative Errors ◽  
Domain Discretization ◽  
Element Free

When contact problems are solved by numerical approaches, a surface profile is usually described by a series of discrete nodes with the same intervals along a coordinate axis. Contact computation based on roughness datum mesh may be time consuming. An adaptive-surface elasto-plastic asperity contact model is presented in this paper. Such a model is developed in order to reduce the computing time by removing the surface nodes that have little influence on the contact behavior of rough surfaces. The nodes to be removed are determined by a prescribed threshold. The adaptive-surface asperity contact model is solved by means of the element-free Galerkin-finite element coupling method because of its flexibility in domain discretization and versatility in node arrangements. The effects of different thresholds on contact pressure distribution, real contact area, and elasto-plastic stress fields in contacting bodies are investigated and discussed. The results show that this model can help reduce about 48% computational time when the relative errors are about 5%.

Surface Texture and Machining Conditions. Part 1: Model Building Logic in View of Process Control

1983 ◽  
Vol 105 (4) ◽  
pp. 259-263 ◽  
Author(s):  
A. Villa ◽  
S. Rossetto ◽  
R. Levi
Keyword(s):  
Process Control ◽  
Surface Texture ◽  
Model Building ◽  
Surface Profile ◽  
Cutting Parameters ◽  
Tool Geometry ◽  
Machining Processes ◽  
Tool Marks ◽  
Machining Conditions ◽  
Cutting Processes

Surface texture generation in machining processes is examined in view of establishing a model building procedure capable of linking surface finish parameters to machining conditions. In the first part of the paper, with reference to cutting processes with defined tool geometry, a model capable of describing a surface profile as an ordered sequence of tool marks is developed. The use of such a model for process control is also discussed. In the second part, the identification procedure of a model describing profile generation in face milling versus cutting parameters is presented.

Study on the Edge Quality Control in Grinding Engineering Ceramics

2010 ◽  
Vol 455 ◽  
pp. 682-685
Author(s):  
Ping Yan Bian ◽  
Bo Zhao ◽  
Yu Li
Keyword(s):  
Quality Control ◽  
Surface Integrity ◽  
Brittle Material ◽  
Surface Profile ◽  
Material Surface ◽  
Interference Detection ◽  
Quality Traits ◽  
Engineering Ceramics ◽  
Edge Quality

In this paper, the edge quality of the nano-ZrO2 ceramics surface grinding was studied on experiments. Through the microscopic observation and measurement on the edge micro-step，and the white interference detection on the 3D surface profile of both sides of the edges, the edge quality traits are obtained，which lay a foundation for further study on the technology of the edge quality controlling and hard brittle material surface integrity evaluation.

scholarly journals Reliability of measurements performed in the IZTW accredited laboratory in the field of surface topography and product geometry

Mechanik ◽  
2018 ◽  
Vol 91 (4) ◽  
pp. 307-310
Author(s):  
Tatiana Miller ◽  
Krzysztof Gajda ◽  
Aneta Łętocha
Keyword(s):  
Quality Control ◽  
Surface Topography ◽  
Surface Texture ◽  
Product Quality Control ◽  
Shape Accuracy ◽  
Tests And Measurements ◽  
Angle Measurements ◽  
Wide Range ◽  
Accredited Laboratory ◽  
Surface Texture Analysis

The scope and the reliability of measurements performed in the accredited laboratory in the Section of Length and Angle Measurements in Department of Geometrical Quantities Metrology of the IAMT were presented. The scope of services include the performance of tests and measurements in a very wide range related to surface texture analysis, research tests of dimensional and shape accuracy and product quality control. The capabilities of equipment and software available in the laboratory were characterized.

scholarly journals Surface Texture Influences on the Running-in Behavior and Friction Reduction

2018 ◽  
Vol 159 ◽  
pp. 02017
Author(s):  
Zhouyong Hou ◽  
Tomomi Honda
Keyword(s):  
Surface Texture ◽  
Internal Combustion Engines ◽  
Friction And Wear ◽  
Fuel Efficiency ◽  
Surface Profile ◽  
Friction Reduction ◽  
Profile Measurement ◽  
Textured Surface ◽  
Combustion Engines ◽  
Textured Surfaces

For improving automobile fuel efficiency, the internal combustion engines must be required to reduce the friction and wear. Changing viscosity of lubricant and surface pressure could succeed, but the seizure is easy to happen in engines. However, the surface texture can solve those problems. The running-in behavior affects friction and wear on whole combustion engines. If the running-in is not carefully designed, catastrophic accident can happen. This experiment investigates that the running-in behavior is influenced by textured surfaces and the tested materials are the cast iron and the different area ratio of dimple of aluminum alloy combination. The friction coefficient and the number and size of wear particles are measured by the friction sensor and particle counter. After the tests, the worn surfaces are measured through using surface profile measurement systems, and some significant phenomena are observed and analyzed. The textured surface verifies good consequence and tribological advantages.

New Developments in PTFE Sheet Gaskets With Engineered Surface Profile

2019 ◽  
Author(s):  
James Drago
Keyword(s):  
Surface Texture ◽  
New Technology ◽  
Compressive Load ◽  
Surface Profile ◽  
Performance Testing ◽  
Performance Characteristics ◽  
Current Field ◽  
New Developments ◽  
Laboratory Performance ◽  
Ptfe Sheet

Abstract This paper presents laboratory performance testing of new technology utilizing a textured raised pattern on filled restructured PTFE (R-PTFE) sheet gasketing. The technology published in PVP2018-84039 and PVP2018-84040 and presented in Prague1,2 examined the load retention attributes of filled PTFE sheet gaskets with hexagonal/honeycomb surface texture in a miniaturized and standard raised face flange joints. This paper will show performance characteristics and comparisons to flat traditional R-PTFE gaskets. Data is presented on leak performance based on DIN-3535-4/6 and EN 13555, deflection under compressive load, bolt load retention and ASTM F36 compression and recovery. The paper gives a summary of results from a study of PTFE gasket users expressing their needs and desires for gasket performance. Examples of current field cases from chemical processors are also be presented.

scholarly journals GMP/GACP - new standards for quality assurance of cannabis

2020 ◽  
Vol 66 (1) ◽  
pp. 91-101
Author(s):  
Mirela Ilikj ◽  
Irena Brchina ◽  
Liljana Ugrinova ◽  
Vasil Karcev ◽  
Aleksandra Grozdanova
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Quality Standards ◽  
Quality System ◽  
Quality Systems ◽  
High Quality ◽  
Iso Standard ◽  
Continuous Quality ◽  
Medicinal Use

In 2015, in Republic of North Macedonia, a new law for narcotics has been adopted, where the changes include legal cultivation of cannabis for medicinal use as well as legal production of cannabis extracts for medicinal use. In order to gain high quality of cannabis and cannabis products for medicinal use and to meet some quality standards that will guarantee consistency, traceability and continuous quality of the product, it is necessary to implement Quality Systems. Good quality system is ISO standard system but for cannabis for medicinal use, GACP, GMP and GLC standards are used more often. Production of cannabis for medicinal use consists of: process of cultivation where GACP standards are applicable, primary processing where GMP standards are the most important and quality control of final product regulated with GLP standard. In this review, explanation of these standards as well as overview of modes of their implementation has been made. Keywords: GxP, GMP, GACP, GLP

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