N. Tagawa, A. Mori, H. Kajitani, Masanobu Hashimoto
This paper describes head/disk interface dynamics for micromachined silicon dual negative pressure slider bearings with an integrated microsuspension mechanism which we proposed, at steady state flying in proximity magnetic recording. The authors first indicated the analitycal model for air bearing dynamics of dual structure mother ship slider mechanisms, and the advantages of this mechanisms were discussed from the dynamics points of view, compared with conventional flying head slider mechanisms. Furthermore, the effects of stiffness and damping characteristics of an integrated microsuspension mechanism on mother ship slider system dynamics were also analyzed numerically. Considering those numerical simulation results, optimum design method for microsuspension gimbals was established to suppress the coupled vibration between primary and secondary sliders, caused by secondary slider’s piggy-backed structure. It became clear that micromachined integrated microsuspension mechanisms have to be designed not only from the static and silicon micromachined process points of view, but also from the mother ship slider dynamics points of view, in order to achieve head/disk interface reliability in high density proximity magnetic recording.
{"title":"Dynamics for Micromachined Silicon Dual Negative Pressure Slider Bearings With an Integrated Microsuspension Mechanism in Proximity Magnetic Recording","authors":"N. Tagawa, A. Mori, H. Kajitani, Masanobu Hashimoto","doi":"10.1115/imece1998-0213","DOIUrl":"https://doi.org/10.1115/imece1998-0213","url":null,"abstract":"\u0000 This paper describes head/disk interface dynamics for micromachined silicon dual negative pressure slider bearings with an integrated microsuspension mechanism which we proposed, at steady state flying in proximity magnetic recording. The authors first indicated the analitycal model for air bearing dynamics of dual structure mother ship slider mechanisms, and the advantages of this mechanisms were discussed from the dynamics points of view, compared with conventional flying head slider mechanisms. Furthermore, the effects of stiffness and damping characteristics of an integrated microsuspension mechanism on mother ship slider system dynamics were also analyzed numerically. Considering those numerical simulation results, optimum design method for microsuspension gimbals was established to suppress the coupled vibration between primary and secondary sliders, caused by secondary slider’s piggy-backed structure. It became clear that micromachined integrated microsuspension mechanisms have to be designed not only from the static and silicon micromachined process points of view, but also from the mother ship slider dynamics points of view, in order to achieve head/disk interface reliability in high density proximity magnetic recording.","PeriodicalId":414918,"journal":{"name":"9th International Symposium on Information Storage and Processing Systems","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129450612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This work examines the free vibration and stability of a rotating flexible disk-spindle system. The extended operator formulation (Parker, 1997) is exploited to discretize the system using Galerkin’s method. The coupled vibration modes of the system consist of disk modes, in which the disk dominates the system deformation, and spindle modes, in which the spindle dominates the system deformation. Both the natural frequencies and vibration modes are strongly affected by disk flexibility. If the membrane stresses associated with disk rotation are neglected then the system exhibits flutter instabilities, but these instabilities are not present when membrane stresses are included. Natural frequency veering between disk and spindle frequencies is prominent at low speeds and substantially affects the spectrum and stability. No veering is observed at high speeds where rotational stress stiffening diminishes disk-spindle coupling and causes the natural frequencies to converge to those of a rotating spindle carrying a rigid disk. Changes to the vibration modes are examined in terms of a strain energy ratio measuring the contribution of the disk strain energy to the total modal strain energy.
{"title":"Free Vibration and Stability of a Rotating Disk-Spindle System","authors":"Pushkaraj J. Sathe, R. Parker","doi":"10.1115/imece1998-0210","DOIUrl":"https://doi.org/10.1115/imece1998-0210","url":null,"abstract":"\u0000 This work examines the free vibration and stability of a rotating flexible disk-spindle system. The extended operator formulation (Parker, 1997) is exploited to discretize the system using Galerkin’s method. The coupled vibration modes of the system consist of disk modes, in which the disk dominates the system deformation, and spindle modes, in which the spindle dominates the system deformation. Both the natural frequencies and vibration modes are strongly affected by disk flexibility. If the membrane stresses associated with disk rotation are neglected then the system exhibits flutter instabilities, but these instabilities are not present when membrane stresses are included. Natural frequency veering between disk and spindle frequencies is prominent at low speeds and substantially affects the spectrum and stability. No veering is observed at high speeds where rotational stress stiffening diminishes disk-spindle coupling and causes the natural frequencies to converge to those of a rotating spindle carrying a rigid disk. Changes to the vibration modes are examined in terms of a strain energy ratio measuring the contribution of the disk strain energy to the total modal strain energy.","PeriodicalId":414918,"journal":{"name":"9th International Symposium on Information Storage and Processing Systems","volume":"196 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115652026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The natural frequencies (NFs) and the corresponding mode shapes of a glide head with a piezoelectric transducer (PZT) mounted on its extended wing have been studied both analytically and experimentally. Finite element analysis results indicate that the extended wing reduces the NFs of the glide head substantially. The manufacturing tolerances of the slider and PZT as well as the PZT bonding location can have a significant effect on the NFs. As the glide head contacts the laser bump texture during the landing process, the NFs of the glide head increase slightly, probably because of the constraint provided by the stiffness of the bumps during the contact. The NFs calculated by finite element analysis show good agreement with the data obtained using two different experimental methods.
{"title":"Natural Frequency Analysis of PZT Glide Heads During Contact","authors":"A. Y. Tsay, C. Ku, I. Shen, B. Marchon","doi":"10.1115/imece1998-0212","DOIUrl":"https://doi.org/10.1115/imece1998-0212","url":null,"abstract":"\u0000 The natural frequencies (NFs) and the corresponding mode shapes of a glide head with a piezoelectric transducer (PZT) mounted on its extended wing have been studied both analytically and experimentally. Finite element analysis results indicate that the extended wing reduces the NFs of the glide head substantially. The manufacturing tolerances of the slider and PZT as well as the PZT bonding location can have a significant effect on the NFs. As the glide head contacts the laser bump texture during the landing process, the NFs of the glide head increase slightly, probably because of the constraint provided by the stiffness of the bumps during the contact. The NFs calculated by finite element analysis show good agreement with the data obtained using two different experimental methods.","PeriodicalId":414918,"journal":{"name":"9th International Symposium on Information Storage and Processing Systems","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116803305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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