Quality Engineering Using Robust Design
Quality Engineering Using Robust Design
Feedback Control Theory
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The IBM 5 1/4-inch disk drive contained in the IBM 9345 DASD Module provides high track density and storage capacity, dynamic test failure rates below three parts per million, and low sensitivity to assembly variations. The design techniques used to achieve the required vibrational characteristics of the head actuator assembly are described. Dynamic stability specifications are derived from drive performance requirements and the actuator servomechanical system design. Modeshapes of the actuator are determined by encoding magnetic patterns onto a disk and using the read/write heads as position transducers in an operational drive. Structural changes in the carriage assembly that might lead to design improvements are explored with models derived using finite element analysis. Taguchi orthogonal matrix experiments are used to reduce the sensitivity of the actuator to dimensional tolerances and assembly processes. The achievement of actuator assembly design objectives is verified from production yields and statistical data obtained during dynamic tests.