Study Of Anti-shock Performance Of Head With Load/unload Technology And Experimental Research

With the development of electronic information, electronic products are moreand more intelligent and multifunctional. The storage equipment of electronicproducts developed toward miniaturization and high storage capacity. As a mainkind of electronic products storage equipment, the microdrive attracts more andmore attention of people, especially in the storage density and the performance ofdrop shock resistance. In order to meet the market demand, the magnetic recordingdensity of hard disk drive has increased rapidly. For the new read/write head withthe new HAMR storage technology, its storage density can reach5-10Tbit/in2.Because of the high storage density, the space between head and disk diminishedfurther, which give a huge challenge to the performance of drop shock resistance.In order to improve the head disk interface performance of drop shockresistance, this paper mainly research on the head disk interface of microdrive. Ahead disk system mathematical model of a drop microdrive was founded, afterstudying the principle of the microdrive working. The differential equations of headdisk interface were calculated with numerical simulation method, and we can getthe response of head disk collision curve.In order to forecast the head disk interface performance of drop shockresistance more comprehensive, the finite element model of a whole microdrivewere founded with ANSYS/LS-DYNA. The dynamic characteristics of a dropmicrodrive were simulated in LS-DYNA with many kinds of load, including theeffects of different amplitude, different pulse width, different kinds of drop way ondisk vibration, head disk collision, contact force and friction.A microdrive sample was cut by laser base on bounce table to fit experimentalrequirements. Designing the fixture of a microdrive, a drop impact experiment rigwas founded. In the experiment, he dynamic response of the head disk interface wasmeasured By a laser doppler vibration tester (LDV). With comparing and analyzingthe data got from the impact experiments, this paper explained the experimentalphenomena and summarized the dynamic response characteristics of a dropmicrodrive in the last.