Rejecting Rotational Disturbances on Small Disk Drives Using Rotational Accelerometers
نویسنده
چکیده
Small disk drives are inherently designed for portable applications and thus must be able to reject external shock and vibration. This paper expands on previous efforts at using the signal from a rotational accelerometer to minimize the the effects of these disturbances by dealing with several issues that come up: accelerometer beam resonances, low sample rate of the embedded servo on the disk drive, and widely varying accelerometer gains. The resulting algorithm is both simple and effective, making it practical for in drive use. Experimental data is provided.
منابع مشابه
Track-following control using a disturbance observer with asymptotic disturbance rejection in high-speed optical disk drives
To obtain a good tracking performance in an optical disk drive servo system, it is essential to attenuate periodic disturbances caused by eccentric rotation of the disk. As an effective control scheme for enhancing disturbance attenuation performance, disturbance observers (DOBs) have been successfully applied to the track-following servo system of optical disk drives. In disk drive systems, th...
متن کاملFrequency Adaptive Control Technique for Periodic Runout and Wobble Cancellation in Optical Disk Drives
Periodic disturbance occurs in various applications on the control of the rotational mechanical systems. For optical disk drives, the spirally shaped tracks are usually not perfectly circular and the assembly of the disk and spindle motor is unavoidably eccentric. The resulting periodic disturbance is, therefore, synchronous with the disk rotation, and becomes particularly noticeable for the tr...
متن کاملRotational Position Optimization (RPO) Disk Scheduling
Rotational position optimization disk scheduling algorithms utilize seek distance versus rotational distance information implemented as rpo tables (arrays) which are stored in flashmemory within each disk drive. We consider a novel representation scheme for this information reducing the required flashmemory by a factor of more than thirty thereby reducing the manufacturing cost per drive. We pr...
متن کاملA New Approach to Disk Scheduling Using Fuzzy Logic
Disk scheduling is one of the main responsibilities of Operating System. OS manages hard disk to provide best access time. All major Disk scheduling algorithms incorporate seek time as the only factor for disk scheduling. The second factor rotational delay is ignored by the existing algorithms. This research paper considers both factors, Seek Time and Rotational Delay to schedule the disk. Our ...
متن کاملManaging Thermal Emergencies in Disk-Based Storage Systems
Thermal-aware design of disk-drives is important because high temperatures can cause reliability problems. Dynamic thermal management (DTM) techniques have been proposed to operate the disk at the average case temperature, rather than at the worst case by modulating the activities to avoid thermal emergencies caused by unexpected events, such as fan-breaks, increased inlet air temperature, etc....
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1996