Sensitivity Analysis Vs Tolerance Analysis

Introduction

Introduction

Has always been considered the analysis of tolerance and the activity that occurs at the end of the detailed design. The goal is to establish proper controls dimensions or tolerances of the components of the product to achieve a balance between product quality and cost. This narrow view of quality control lacks an important factor in the quality of the product, and the strength of the same design changes. Degree of sensitivity is the basic criteria for the product of change and modify the design. The present paper how sensitivity analysis along with the analysis of tolerance can have a greater impact on the overall quality of the products at a lower cost than traditional tolerance analysis.

A strong concept

The quality can be addressed in the design phase of the design through an understanding of the sensitivity of the parameters of the product key for the site, design and critical interfaces trend. Even before he knew the plans and take the dimension of the selection process the important decisions that affect the quality of the final product is still ongoing. For example, a combination of means 4 and find the pin is a design approach 2 - a common method to locate the two relative to each other. The distance between the elements affect the GPS sensitivity relative orientation of these two parts of the site and the size of the variation in the same properties. We will send more of these features each other tolerance tighten the relative orientation control between the same parties. Our design model that allows these sensitivities analysis provides an important first step in quality control. The different concepts can be analyzed to find the concept will be more robust to changes that will be introduced during the manufacturing process.

Manufacturing process modeling

Concept offered through detailed design and pre-production of the new decisions are made that affect the quality of the product. All systems are made with manufacturing controls associated dimensions. Understand the sensitivity with tolerance analysis of the critical parameters of the reference product and systems to allow specific dimension intelligent analysis of the trade-offs of these different options. The same principle applies to the surrounding Assembly resolutions. Sites of installation and connection types have different effects on the posting of changes in the Assembly. Be able to design a form correctly and understand the sensitivity of the different configurations of the annex to the quality of the product and it is important to make objective decisions on different reference systems (GPS).

Measuring the quality of the product

Sensitivity model was used above to make compromise decisions, but he did not provide proof of the quality of the product is expected. Once we have strong design and manufacturing concept, can take final decisions in the selection process. Treat the actual data can be used with the sensitivity of the model to accurately estimate the expected variability of the product. And can make objective decisions to find the process that reduce costs, and reduce cycle time and still meet the objectives of the quality of the product. This is the area that is traditionally tolerance analysis, but now there is strong sensitivity model which forms the basis of this analysis. In addition, the steps to analyze the traditional tolerance is one of the best starting point. It is less likely to need major design changes to achieve the objectives of quality because the current design of the powerful changes.

Understand the causes of defects

Investment in the establishment of model sensitivity not only gives a basis for further analysis accurate predictive of tolerance, but it also provides the basis for one of the root causes more analysis. If unexpected failure occurs during the production of the sensitivity of the model is easily extensible to add new product parameter. And can then be model sensitivity analysis to determine the design criteria that have the greatest impact on this product is a new parameter. And put one of these design parameters with high sensitivity have the greatest impact on the development of product failure that have been identified. In addition, sensitivity can since the model is to be the proper implementation of all the sensitivity and tolerance previous analyzes to ensure that it will not be affected by the new design change.

The role of the geometric dimensions and tolerancing

Dimensions and geometric tolerancing or GD & T is a way to determine the size, location and direction and form part feature. And using a special set of symbols to determine the relationship between function and benchmarks. Are grouped GD & T control with tolerance and rates, and frame of reference data within the tolerance, as shown below.

And tolerance, sometimes called GD & T legend relates not only feature difference allowed by the inspection and references, but also the intent of the design part. Is created GD & T in the CAD system such as Pro / E, CATIA or SolidWorks, and can also be created by the program of GD & T.

Closure

And a model of the sensitivity of the critical product parameters for various design parameters provides a basis for improving the quality of even the most traditional tolerance analysis. The concept can be identified that is robust to changes. The patterns can be implemented the appropriate dimension and installation accessories that will help you to change control. And objective decision can be made regarding the quality of the product and the selection process. Finally, an analysis of the causes of unexpected breakdowns more efficiently.

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