Noise factors, manufacturing processes

The development cycle of a product can be separated into three stages, which are product design, process design and manufacturing. In Table 4.1, copied from reference [8], is shown in what stage countermeasures against the three types of noise factors can be taken. As can be seen countermen-... 

MEMS devices have to meet certain criteria with respect to their functional parameters, for example, a scale factor, offset of the output value, temperature coefficient, nonlinearity, hysteresis, noise, resolution, and cross sensitivities, which characterize the system s performance. In addition, we are interested in the reliability, yield, and cost of the devices. The set of functional parameters depends on a set of model parameters, consisting of processing, material, and geometrical parameters. All model parameters act as input parameters for the design procedure as well as for the manufacturing process. Material parameters are influenced by... 

The same is tme for a production engineer. In designing a product or process, in addition to the major parameter settings, noise factors such as manufacturing variation, component tolerance, customer use conditions, and product deterioration need to be taken care of. A good product or process is one that is robust to variations due to these noise factors. 

The performance of complex engineering systems and quality of products or processes generally depend on many factors. Taguchi separates these factors into two main groups control factors and noise factors (Ross (1988)). Control factors are those which are set by the designers or manufacturers noise factors are those over which the designers or manufacturers have no direct control but which vary in the environment of the system or product (Phadke (1989)). 

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