Study On Lightweight Material Selection For Automotive Based On Fuzzy VIKOR Method And The Hierarchical House Of Quality

Increasingly severe energy shortage and environmental pollution, new demands on the vehicle’s energy saving and emission reduction. Studies have shown that light-weight automobile is the most effective way to reduce fuel consumption and exhaust emissions. Traditionally weight is divided into lightweight materials, lightweight shapes,lightweight making,lightweight design,lightweight function, etc. Due to the emergence of new materials, Using lightweight materials to reduce vehicle mass attracted many technicians. Using lightweight materials to replace traditional materials usually results in higher costs for materials and production costs, In the age of market economy, Designing and manufacturing must take into account the cost issue. How applying a lightweight material cost increases, and its fuel economy and strike a balance the environmental benefits and became a problem to many developers. Selection of lightweight materials is a multiple attributes program, some property of materials when the different parts design and performance goals are met, there may be conflicting. This is suitable for the application of multi-objective multi-attribute decision making method to resolve.Based on the "Appropriate material at the right place", this article uses a combination of hierarchical House of quality methods and eclectic fuzzy multi-attribute, research on the specific choice of automotive lightweight material. Through hierarchical House of quality and fuzzy compromise approach combining organic linking customer needs and material properties and multifaceted, multi-attribute analysis problems, solve the subjective faults of traditional selection methods, provides a rational and scientific material options. Based on the body parts selection of lightweight materials for the purpose of a case study of a certain model of car door panel, you need to identify some alternative lightweight materials. Alternative material of determines first can search meet parts design constraint conditions of feasible light material, this a process can through material expert or engineering personnel experience for select, paper in the not do in-depth described, to out of alternative program is baking culture hardened steel(BH), and double phase steel(DP), and high strength low alloy steel(HSLA), and 5xxx aluminum, and 6xxx aluminum, and magnesium alloy, and carbon fiber enhanced plastic(CFRP), and high-density polyethylene(HDPE), 9 species material, And according to objectives and alternative materials, follow the principle of comprehensiveness, objectivity and independence, select the density and price, young’s modulus, tensile strength, elongation, formation, connectivity, paint, corrosion resistance and recovery 10 attributes of the property as an alternative. The various properties of different materials constitutes a decision matrix, precise quantitative properties of which can be obtained through access to information; some properties of fuzzy qualitative to be studied by experts mark questionnaire expert mark. Normalizing the decision matrix and normalized decision matrix. Rational selection of materials to meet customer demand for automotive components, thesis, manufacturability, environmental protection, fuel economy, NVH, durability, cost, degree of torsional rigidity and dent resistance, flexural rigidity and Crashworthiness ten customer requirements such as performance and mutual importance obtained by analytic hierarchy process of comparison between any two means pairwise comparison. Then, the hierarchical House of quality method to determine the weight of material properties on overall customer satisfaction, hierarchical House of quality is a decomposition of the QFD framework, a clear hierarchy of new methods for QFD.Standardized decision matrix, the competitive assessment matrix to obtain material properties of entropy, and customer satisfaction, weight and material properties on the get comprehensive weight, lay the Foundation for the material selection process. Decision matrix is made and properties after the General weight of the material, this material selection based on fuzzy compromise decision making theory, get a car door panel best lightweight materials program. Finally, Applying Ashby diagrams to analysis the rationality of the door plate cutting.