Unit Manufacturing Processes Issues and Opportunities in Research (1995) / Chapter Skim
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11 Sensor Technology
11 Sensor Technology
Pages 135-142
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From page 135... ...
can be envisioned for ensuring that this information is available: data bases and knowledge bases that capture empirical data and heuristic rules; models of the process and its components, from which performance can be predicted; and direct measurements from sensors for process monitoring and feedback to controllers. All focus areas are subject to monitoring needs, often with competing requirements for time response or location of sensors.
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From page 136... ...
The committee envisions manufacturing systems that are so finely controlled that they achieve very stringent requirements of new materials, processing techniques, tolerances or shapes, production speeds, and yields that would be extremely difficult to achieve without the real-time aid of computers in which process models are embedded and to which an array of sensors constantly communicate the process state and provide system diagnostics of potential problem areas. The speed of response and level of attention required for these new unit processes exceed the capabilities of the most adept machine operator.
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From page 137... ...
Up to 90 percent of the cost can be attributed to the final finish machining of the sintered parts by grinding; lapping; or other less conventional techniques, such as electrical discharge or laser-assisted machining. The machining process itself may induce surface defects in the component, which severely limit its usefulness.
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From page 138... ...
These requirements tend to reduce the effectiveness of, or eliminate consideration of, a large number of traditional sensing methodologies—for example, in the case of tool condition sensing in machining, force, torque, and motor current or power measurement. Unit process equipment can be viewed as platforms for advanced sensors and controls.
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From page 139... ...
RESEARCH OPPORTUNITIES Key aspects of sensor technology to be emphasized for R&D include: sensor systems with digital architectures readily integratable with . machine controllers; · intelligent sensor systems that employ advanced sensor fusion and feature extraction techniques for reliable process-state determination and diagnostic decision making; · process-specific sensor developments that address the need to monitor aspects of all five process components;
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From page 140... ...
140 Unit Manufacturing Processes: Issues and Opportunities in Research · new sensor materials and techniques capable of monitoring nontraditional processes and the processing of nontraditional materials; exploitation of sensor technology that was developed for applications other than unit manufacturing processes; · digital signal processing techniques that can accommodate uncertainty in sensor-produced data; · methodologies for readily assessing the economic viability of applying sensor systems in unit processes; and · vehicles for speeding industrial evaluation and commercialization of new sensing technologies.
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From page 141... ...
1990. Fertigungssicherheit und-qualitat durch Intelligente Technologien, Aachen Machine Tools Colloquim, May 1990, Wettbewerbsfaktor Produktionstechnik.
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