Visibility Analysis for Assembly Fixture Calibration Using Screen Space Transformation

2003 ◽  
Author(s):  
Zhenyu Kong ◽  
Wenzhen Huang ◽  
Dariusz Ceglarek
Keyword(s):  
Visibility Analysis ◽  
Space Transformation ◽  
Significant Burden ◽  
New Type ◽  
Quality Of Products ◽  
Screen Space ◽  
Calibration Time ◽  
Assembly Fixture

In a number of manufacturing processes, tooling installation, calibration and maintenance guarantee the precision of fixtures and play important roles towards the overall quality of products. Recently a new type of measurement equipment called “laser tracker” was developed and utilized for assembly fixture calibration to shorten calibration time and improve the accuracy of the currently used theodolite systems. Though, the calibration of assembly fixture is critical for product quality, the calibration time creates significant burden for productivity of multi-station assembly processes. In order to shorten the calibration lead time, the number of necessary calibration setups which is determined by visibility analysis needs to be minimized. This paper presents a screen space transformation based visibility analysis that allows minimizing the number of setups. The screen space transformation is applied to transform the visibility problem from 3D to 2D space, consequently the visibility problem can be solved efficiently. A case study illustrates the procedure and verifies the validity of the proposed methodology.

Visibility Analysis for Assembly Fixture Calibration Using Screen Space Transformation

2004 ◽  
Vol 127 (3) ◽  
pp. 622-634 ◽  
Author(s):  
Zhenyu Kong ◽  
Wenzhen Huang ◽  
Dariusz Ceglarek
Keyword(s):  
Dimensional Space ◽  
Manufacturing Processes ◽  
Navigation Systems ◽  
Visibility Analysis ◽  
Space Transformation ◽  
Quality Of Products ◽  
Multistation Assembly ◽  
Screen Space ◽  
Calibration Time ◽  
Assembly Fixture

In a number of manufacturing processes—tooling installation, calibration, and maintenance—guarantee the precision of fixtures and play important roles toward the overall quality of products. Recently, a new type of measurement equipment called a “laser tracker” was developed and utilized for assembly fixture calibration to shorten calibration time and improve the accuracy of the currently used theodolite systems. Though calibration of the assembly fixture is critical for product quality, as such, calibration time creates a significant burden for productivity of multistation assembly processes. In order to shorten calibration lead time, the number of necessary setups, determined by visibility analysis, needs to be minimized. This paper presents a screen space transformation-based visibility analysis that allows minimizing the number of setups. The screen space transformation is applied to transform the visibility problem from three- to two-dimensional space, thus, efficiently solving the visibility problem. A case study illustrates the procedure and verifies the validity of the proposed methodology. This methodology can be applied not only for manufacturing processes, such as in-line fixture calibration, but also toward analysis and optimization of AGVs, robot navigation systems, and building security.

Taguchi's Loss Function in the Weight Quality of Products: Case Study of Cheese Making

2021 ◽  
pp. 453-466
Author(s):  
Nicolás Francisco Mateo-Díaz ◽  
Lidilia Cruz-Rivero ◽  
Luis Adolfo Meraz-Rivera ◽  
Jesús Ortiz-Martínez
Keyword(s):  
Loss Function ◽  
Cheese Making ◽  
Quality Of Products ◽  
Taguchi’S Loss Function

scholarly journals Performance Evaluation Using Multivariate Non-Normal Process Capability

Processes ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 833 ◽  
Author(s):  
Alatefi ◽  
Ahmad ◽  
Alkahtani
Keyword(s):  
Manufacturing Industry ◽  
Process Capability ◽  
Quality Characteristic ◽  
Process Capability Indices ◽  
Manufacturing Processes ◽  
Capability Indices ◽  
Skewness Reduction ◽  
Quality Of Products

Process capability indices (PCIs) have always been used to improve the quality of products and services. Traditional PCIs are based on the assumption that the data obtained from the quality characteristic (QC) under consideration are normally distributed. However, most data on manufacturing processes violate this assumption. Furthermore, the products and services of the manufacturing industry usually have more than one QC; these QCs are functionally correlated and, thus, should be evaluated together to evaluate the overall quality of a product. This study investigates and extends the existing multivariate non-normal PCIs. First, a multivariate non-normal PCI model from the literature is modeled and validated. An algorithm to generate non-normal multivariate data with the desired correlations is also modeled. Then, this model is extended using two different approaches that depend on the well-known Box–Cox and Johnson transformations. The skewness reduction is further improved by applying heuristics algorithms. These two approaches outperform the investigated model from the literature because they can provide more precise results regardless of the skewness type. The comparison is made based on the generated data and a case study from the literature.

scholarly journals Integrated Quality-Based Production-Distribution Planning in Two-Echelon Supply Chains

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Husein Pasha ◽  
Isa Nakhai Kamalabadi ◽  
Alireza Eydi
Keyword(s):  
Mixed Integer ◽  
High Quality ◽  
Swarm Optimization ◽  
Integrated Production ◽  
Quality Degradation ◽  
Production Distribution ◽  
Quality Of Products ◽  
Over Time

The integrated production-distribution (P-D) planning has turned into one of the most essential areas in supply chain (SC) management in recent years, especially in the case of perishable products in which the quality of products can change over time. Nonetheless, so far, the suggested models have focused on the P-D stages of the chain while the delivery of high-quality products to customers is of paramount significance in the perishable SC. In the present paper, a multiobjective, mixed-integer, and nonlinear programming (MOMINLP) mathematical model was developed for integrated P-D deteriorating items in a two-echelon SC that emphasizes quality degradation. Quality is monitored and calculated as a function of temperature and time throughout the SC, and the main purpose of the model is to first increase the quality of products delivered to customers and, second, minimize the SC costs. To optimize the problem, the particle swarm optimization (PSO) approach was also incorporated into the model. The obtained model was applied to a case study in Protein Gostar Sina Company in Iran, which resulted in decreased P-D costs as well as increased customer satisfaction.

scholarly journals Position of Price in Determinants of Quality of Products (Case Study)

2015 ◽  
Vol 08 (02) ◽  
pp. 149-160
Author(s):  
Arash Hoseinkhani ◽  
Mohsen Nazari ◽  
Fereshteh Farzianpour ◽  
Shadi Hosseini
Keyword(s):  
Quality Of Products

scholarly journals The Effect of Innovation, Promotion, and Quality of Products on Consumer Loyalty with Satisfaction as Intervening Variables (Case Study Costumer PT. Mandom In Surabaya)

2021 ◽  
Vol 2 (3) ◽  
pp. 206-213
Author(s):  
Rega Irsa Irawan ◽  
Sengguruh Nilowardono
Keyword(s):  
Customer Satisfaction ◽  
Product Quality ◽  
Consumer Satisfaction ◽  
P Value ◽  
Consumer Loyalty ◽  
Significant Positive Effect ◽  
Quality Of Products ◽  
Positive Effect

This study aims to determine the effect of innovation, promotion, product quality on consumer loyalty with customer satisfaction as intervening. This research method uses quantitative with OLS analysis tools. The research instrument was a questionnaire with 75 samples of Gastby product consumers. The results of the study prove that Innovation has positive significant effect on consumer satisfaction as evidenced by the results of t value of 4.457 with p-value of 0.00, Innovation has significant positive effect on consumer loyalty as evidenced by the results of t value of 8.897 with p-value amounting to 0,000, promotion does not have a significant positive effect on customer satisfaction t value of 0.421 with a p-value of 0.674, promotion does not have a significant positive effect on consumer loyalty as evidenced by the result of t of 1,277 with a p-value of 0,202, quality the product has significant positive effect on customer satisfaction as evidenced by the results of t table (1.666) and p-value smaller than 0.05, product quality has significant positive effect on loyalty consumer as evidenced by the results of this value greater than t table (1.666 ) and p-value is smaller than 0.05 consumer power has an effect on consumer loyalty as evidenced by the results of t value of 4.689 with a p-value of 0.00.  

scholarly journals Albendazole in malignant ascites: a case report and literature review on the successes and adverse effects of therapy

2021 ◽  
Vol 8 (10) ◽  
pp. 3146
Author(s):  
Jasmine J. Mui ◽  
David Morris
Keyword(s):  
Hepatic Metastases ◽  
Malignant Ascites ◽  
Adverse Outcomes ◽  
Vascular Endothelial ◽  
Impaired Liver Function ◽  
Impaired Liver ◽  
Significant Burden ◽  
Endothelial Growth Factor

Malignant ascites places a significant burden on the healthcare system and has a profound effect on patient quality of life. Albendazole (ABZ) is an anti-helminthic agent that has shown to rapidly reduce malignant ascites with minimal side effects in pre-clinical trials. The following case study explores the effect of ABZ on ascitic volume in a patient with malignant ascites secondary to metastatic colorectal adenocarcinoma. The patient is a 54-year-old man who underwent an ultrasound guided ascitic drainage for worsening ascites secondary to hepatic metastases from sigmoid adenocarcinoma. He was commenced on ABZ based on literature demonstrating that ABZ decreases the volume of malignant ascites via the inhibition of vascular endothelial growth factor. Over the next week, the volume of ascitic fluid decreased significantly, however the patient developed neutropenia unresponsive to granulocyte colony stimulating factor likely in the context of impaired liver function. The efficacy of ABZ in this case study as well as in the literature demonstrates the promising potential for use in reducing malignant ascites. However, this case demonstrates the need for caution for use in patients with liver impairment due to changes to first pass metabolism leading to increased circulating drug toxicity and thus, adverse outcomes.  

Multi-Technique Approach for the Assessment of Historical Masonry Constructions

2013 ◽  
Vol 569-570 ◽  
pp. 1249-1256
Author(s):  
Francisco M. Fernandes ◽  
Luís F. Ramos ◽  
Elizabeth Manning ◽  
João Ferreira ◽  
Paulo Mendes
Keyword(s):  
Cross Section ◽  
Acquisition System ◽  
Research Project ◽  
Nondestructive Techniques ◽  
New Type ◽  
Historical Masonry ◽  
The Cross ◽  
Initial Results

In this paper the NDTs research project is briefly described. This project aims at developing and improving several nondestructive techniques typically used in masonry diagnosis. So far, a new acquisition system based on sonic measurements, a geoelectric prototype to perform tomographic measurements of the cross-section of masonry elements and a new type of flat-jack test, the tube-jack, were developed. Finally, the project aims at merging the data of these improved techniques with existing ones in order to produce a better diagnosis of these structures. The initial results of the case study of S. Torcatos church is illustrated here to show the potential of these methods and the quality of the information that can be derived from the merging of the data obtained through different methodologies.

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