IMPLEMENTACIÓN DE UN SISTEMA POKA-YOKE PARA ENSAMBLE DE SELLO EN BOMBA PARA DIRECCIÓN HIDRÁULICA (IMPLEMENTATION OF A POKA-YOKE SYSTEM FOR PUMP SEAL ASSEMBLY FOR HYDRAULIC STEERING)

Resumen Con este diseño se espera contribuir a la disminución de las garantías en la línea de producción Domestic Power Steering (DPS), con el objetivo de reducir los efectos de la variación de presión en el ensamble del sello de la bomba del sistema de la dirección hidráulica para diferentes modelos en una empresa automotriz de la región. En la primera fase se realizó un análisis para encontrar la causa de la falla y determinar las razones de las variaciones de presión en el proceso y su impacto en el sistema de producción. En la segunda fase se diseñó, fabricó e implementó el sistema Poka-Yoke con el cual se espera contribuir a la disminución de estas garantías en un 30%. Con este, se eliminará la variación de la presión del equipo al momento del ensamble, se aumentará la seguridad para el operador, obteniendo resultados satisfactorios en el producto final. Palabras Clave: Ensamble, Implementación, Poka-Yoke, Sello, Variación de presión. Abstract This design is expected to contribute to the reduction of warranties in the Domestic Power Steering (DPS) production line, with the aim of reducing the effects of pressure variation in the hydraulic steering system pump seal assembly. for different models in an automotive company in the region. In the first phase, an analysis was carried out to find the cause of the failure and determine the reasons for the pressure variations in the process and their impact on the production system. In the second phase, the Poka-Yoke system was designed, manufactured and implemented, with which it is expected to contribute to the reduction of these guarantees by 30%. With this, the variation in the pressure of the equipment at the time of assembly will be eliminated, the safety for the operator will be increased, obtaining satisfactory results in the final product. Keywords: Assembly, Implementation, Poka-Yoke, Seal, Pressure Variation

The Effectiveness of Warranties in the Solar Photovoltaic and Automotive Industries

A warranty is an agreement outlined by a manufacturer to a customer that defines performance requirements for a product or service. Although long warranty periods are a useful marketing tool, in 2011 the warranty claims expense was 2.6% of total sales for computer original equipment manufacturers (OEMs) and is over 2% of total sales in many other industries today. Solar PV systems offer inverters with 5-15 year warranties and PV modules with 25-year performance warranties. This is problematic for the return on investment (ROI) of solar PV systems when the modules are still productive and covered under warranty but inverter failures occur due to degradation of electronic components after their warranty has expired. Out-of-warranty inverter failures during the lifetime of solar panels decrease the ROI of solar PV systems significantly and can cause the annual ROI to actually be negative 15-25 years into the lifetime of the system. This thesis analyzes the factors that contribute to designing an optimal warranty period and the relationship between reliability and warranty periods using General Motors (GM) and the solar PV industry as case studies. A return on investment of a solar photovoltaic system is also conducted and the effect of reliability, changing tax credit structures, and failure areas of solar PV systems are analyzed

A Major Study of American (Ford) Compared with Japanese (Honda) Automotive Industry: Their Strategies Affecting Surviabilty

Understanding the role of technology, in the automotive industry, is necessary for the development, implementation, service and disposal of such technology, from a complete integrated system life cycle approach, to assure long-term success. This dissertation provides a unique complete characterization of the system life (cycle) business major cost elements of the automotive industry the subsystems, cost elements, interplay and interdependencies that affect the total real life cycle cost and value the various stated product, organizational, and process initiatives intended to produce significant improvements in the American automobile industry, as compared to the Japanese. This dissertation adds a perspective, understanding, and new insights of the drivers of business/technology changes and challenges that are likely to occur over the next 5-10 years. Research was carried out by an extensive review of publications, technical journals, articles, government agency documents, industry publications, annual reports and company bulletins, data and announcements. Results were generated and compared with past industry leaders\u27 effort

A Major Study of American (Ford) Compared with Japanese (Honda) Automotive Industry: Their Strategies Affecting Surviabilty

Understanding the role of technology, in the automotive industry, is necessary for the development, implementation, service and disposal of such technology, from a complete integrated system life cycle approach, to assure long-term success. This dissertation provides a unique complete characterization of the system life (cycle) business major cost elements of the automotive industry the subsystems, cost elements, interplay and interdependencies that affect the total real life cycle cost and value the various stated product, organizational, and process initiatives intended to produce significant improvements in the American automobile industry, as compared to the Japanese. This dissertation adds a perspective, understanding, and new insights of the drivers of business/technology changes and challenges that are likely to occur over the next 5-10 years. Research was carried out by an extensive review of publications, technical journals, articles, government agency documents, industry publications, annual reports and company bulletins, data and announcements. Results were generated and compared with past industry leaders\u27 effort

Os desafios do mercado automóvel atual: extensões descendentes de marcas premium e a adoção de veículos elétricos

The automotive sector is one of the most competitive and complex markets in the world. The dynamics of this context push manufacturers into implementing downward brand extensions, blurring the differences between value and premium brands. Through an experimental approach, the main study aimed to understand how consumers evaluate a downward brand line extension in the European premium automotive market. Results indicated that the extension purchase intention is dependent of the consumer’s extension attitude, the extension perceived fit, and the status-seeking behaviour, but not of the parent brand attitude, the ownership status, or the innovativeness. The second purpose to the study was to investigate the consumer attitudes towards the adoption of electrical vehicles (EVs) and also to analyse the influence of consumer attitudes on EV adoption in an EV secondary market context. The study relied mainly on in-depth interviews of drivers of conventional vehicles, complemented, in the first part, with quantitative data collected by a survey on drivers’ attitudes. Results suggest that the preference between battery charging point types (personal, workplace, public) is important and dependent on the driver context. The existence of a second conventional car and an advanced range management system were also noted as potentially important. A secondary market of EVs was also suggested as potentially viable, if certain conditions are met.O setor automóvel é um dos mercados mais competitivos e complexos no mundo. As forças dinâmicas que caracterizam este contexto levam os fabricantes a implementar extensões descendentes da marca, reduzindo as diferenças entre as marcas massificadas e marcas premium. Através do método experimental, o estudo principal procurou perceber como os consumidores avaliam extensões descendentes de marcas premium no mercado automóvel Europeu. Os resultados indicaram que a intenção de compra de uma extensão é dependente da atitude do consumidor face à extensão, da semelhança percebida da extensão face à marca mãe, e da procura de prestígio por parte do consumidor, mas não é dependente da atitude do consumidor à marca mãe, do efeito de propriedade, ou da innovativeness. O segundo estudo teve por objetivo investigar as atitudes dos consumidores face à adoção de veículos elétricos, e ainda a aceitação dos consumidores ao mercado secundário de veículos elétricos. O estudo utilizou fundamentalmente entrevistas em profundidade a condutores de veículos convencionais, complementadas, numa primeira parte, com dados quantitativos recolhidos por inquérito sobre as perceções dos consumidores de automóveis. Os resultados sugerem que a preferência entre os tipos de estações de carregamento de baterias (residencial, local de trabalho, pública) é importante e dependente do contexto do consumidor. A existência de um segundo carro convencional e um sistema de gestão de viagem avançado também foram notadas como potencialmente importantes. Foi ainda sugerido que um mercado secundário de veículos elétricos poderá ser viável, caso sejam garantidas certas condições.Programa Doutoral em Marketing e Estratégi

A General Performance Model for Design-Build Highway Pavement

New challenges are revealed as more projects are delivered and contracted through innovative methods such as design-build project delivery and performance-based specifications. One challenge from the owner's perspective is lack of control, especially over design decisions and construction procedures. Due to this problem, highway agencies have adopted various additional contractual provisions, of which one is warranty. Warranty is intended to be a method of protecting the owner from possible quality defects and also of improving the initial and long-term performance of the facility.The research question is how warranty characteristics (i.e., warranty period) and other project characteristics impact the performance of highway pavement projects. To answer this question, a decision model was developed to simulate warranty impacts on project performance. Also, simulations were run to estimate the outcomes of projects with varying scope, contracting, and delivery methods in order to examine the impact of project characteristics on warranty decisions and project outcomes.A probabilistic decision-modeling technique, General Performance Model (GPM), is adopted for this warranty decision model. GPM is one method that is being used widely and has been proven to work for both alternative comparison and selection decision. Since GPM has been developed specifically for the purpose of comparing probable performance outcomes for various decision alternatives, it fits the purpose of this research.According to the simulation results, the contract price tends to increase as the warranty period becomes longer and higher-level performance is required. On the other hand, the agency's expected maintenance and repair costs tend to become less with longer and stricter warranty. Where the life-cycle cost (LCC) of a facility is concerned, the simulation shows that warranty is more beneficial for projects with certain characteristics such as sufficient contractor control, innovation opportunity, design-build delivery method, and performance-based specifications. The results of sensitivity analysis show that warranty period and required-performance level influence project outcomes significantly. Among intermediate factors, amount of warranty risk, motivation for quality improvement, and innovation effort were found to be more sensitive than others.A model is constructed to represent some aspects of the dynamic behavior of a real system. Therefore, a properly developed model can serve as a tool for investigating the behavior of the system and predict future outcomes with reasonable enough accuracy. In order to check the validity of the model, the process of requisite-model validation was applied, and a number of checkpoints were examined through expert interviews.Because of the representative nature of the model, a few assumptions had to be made. Also, the model has some limitations due to its method and scope. First, the project outcomes are measured in the form of life-cycle-cost (LCC) only. The performance measures other than LCC are not considered in the model. Also, the timing of warranty decision is limited to after-project development and prior bidding. Warranty decisions at different times, such as warranty option, which is practiced after construction, are not considered in this model. Finally, the model is limited to asphalt highway pavement projects. Although warranties are often used in other types of projects, such as concrete pavement, bridges, and ITS, they were not considered in this research. The model could be expanded to cover a wider range of project types, decision timing and performance measures in future research

Post-Sale Cost Modeling and Optimization Linking Warranty and Preventive Maintenance

Ph.DDOCTOR OF PHILOSOPH

Solving Multi-objective Integer Programs using Convex Preference Cones

Esta encuesta tiene dos objetivos: en primer lugar, identificar a los individuos que fueron víctimas de algún tipo de delito y la manera en que ocurrió el mismo. En segundo lugar, medir la eficacia de las distintas autoridades competentes una vez que los individuos denunciaron el delito que sufrieron. Adicionalmente la ENVEI busca indagar las percepciones que los ciudadanos tienen sobre las instituciones de justicia y el estado de derecho en Méxic