Process för kontroll av kranvikter
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Having a good understanding of the properties of a product for sale is important in every company, even more so in companies that produce products where certain properties can directly affect customer safety. The weight of load handling equipment is such a property. HIAB in Hudiksvall designs and manufactures truck mounted loader cranes in the mid-range segment. The final weight of such a crane will affect many things; it will affect the rated load of the crane since it is always lifting some part of itself during operation, it will affect the stability of the truck when lifting far away and, maybe the most important aspect, it will affect the maximum allowed load on the truck which has a direct impact on the customer’s profit. Determining the final weight of a crane has proven to be difficult. The weight on a drawing will lack several important features, such as paint, weld and oil, and it will not account for any variation in the raw material. This report describes the work on creating a process that allows the company to approximate the final weight of a crane before it is manufactured, something that can be delivered to the customer if demanded. The proposed process consists of regression analysis with the help of Tikhonov regularization. The regression model is built from measurements of already manufactured cranes along with information about which parts that were mounted on which crane. The model is then regularized with weights from drawings as starting values. The results from simulations show that it is possible for HIAB to use this model to predict the weight of a crane with a precision of about 1 %, as long as some drawings have their weight corrected.
Place, publisher, year, edition, pages
2013. , 59 p.
Teknik, regression, tikhonov, least squares, regularization
IdentifiersURN: urn:nbn:se:ltu:diva-58529Local ID: f1b022e1-5026-4878-9167-c1117103e652OAI: oai:DiVA.org:ltu-58529DiVA: diva2:1031917
Subject / course
Student thesis, at least 30 credits
Mechanical Engineering, master's level
Validerat; 20130618 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved