Computer hard disk is an important part of hardware in computer system.
The position control of hard disk read-write head is very important for the speed and accuracy of data read-write.
Therefore, this paper presents a closed-loop advanced correction computer disk head position controller. Through the simulation analysis, we can see that the system not only has high positioning speed and accuracy, but also improves the stability of the system. The hardware components of computer system mainly include central processing unit, memory and input and output devices. Among them, memory mainly consists of memory and external memory.
Memory is generally composed of semiconductor memory with fast reading and writing speed, which can be accessed directly by CPU. External memory is the main form of auxiliary memory.
External memory is generally composed of magnetic surface memory with slow reading and writing speed, so it is also referred to as disk. The storage principle of magnetic disk is due to the hysteresis effect of magnetic materials, which causes the disk to have two stable remanent magnetic states, which can store binary codes 1 and 0 in the computer.
The principle of disk reading and writing is to use a device called “magnetic head” to form and discriminate different magnetization states in the magnetosphere through the radial movement of the device, thermostatic element thus writing or reading the corresponding binary data. The position control of the read-write head will directly affect the accuracy of the data read from the disk. Therefore, this paper designs a disk head position controller based on closed-loop advanced correction. Through simulation analysis, it can be verified that the controller can not only ensure the stability of the system, increase the stability margin of the system, but also have a higher position positioning accuracy, which makes the read-write data more accurate.
More accurate. In the formula, theta(t) is the angular displacement of the magnetic head; i(t) is the input current; J is the moment of inertia of the device; C is the viscous damping coefficient; K is the elastic coefficient; and Ki is a group of moment constants. By analyzing the transfer function of the head position controller, a closed-loop advanced correction control system is designed as shown in Fig. 2. Let J = 0.01kg m2, C = 0.004N m, K = 10N M / rad, Ki = 0.
05N M / rad, Kf = 4110. By running the closed-loop advanced correction control system, the unit step response curve of the system can be obtained as shown in Figure 3.
It can be clearly seen that the system is very stable, and its adjustment time is less than 0.06s, that is, the tracing time of the closed-loop advanced correction disk drive system is less than 0.
07 s. As far as the current product standards of disk are concerned, for a very small damping system, its performance can better meet the needs of the market. At the same time, the stability margin of the system is analyzed, and Figure 4 shows that this method can not only improve the positioning speed and accuracy of the system, but also further improve the stability of the system.