Elimination of Fretting Wear Particles from the Surface of a Power Cable on a Disk Drive Actuator: A Case Study

1991 ◽  
pp. 291-305
Author(s):  
Walter Prater ◽  
Monica Vargas ◽  
John McDowell
Keyword(s):  
Disk Drive ◽  
Fretting Wear ◽  
Power Cable ◽  
Wear Particles

Fretting Wear Between a Hollow Sphere and Flat Surface

2009 ◽  
Author(s):  
Bart Raeymaekers ◽  
Sebastian Helm ◽  
Ralf Brunner ◽  
Edmund B. Fanslau ◽  
Frank E. Talke
Keyword(s):  
Flat Surface ◽  
Normal Load ◽  
Wear Particle ◽  
Disk Drive ◽  
Fretting Wear ◽  
Wear Particles ◽  
Head Disk Interface ◽  
Low Friction ◽  
Disk Interface ◽  
Particle Generation

Wear particles in a hard disk drive may cause the head/disk interface to fail. We have experimentally investigated wear particle generation resulting from fretting wear between the dimple on the suspension and the gimbal spring. We have found that increasing the normal load as well as using a low friction coating reduces the formation of wear particles.

Troubleshooting Cable Deployed Thru Tubing Electrical Submersible Pumps: A Case Study from South East Asia

2021 ◽  
Author(s):  
Saurabh Anand ◽  
Eadie Azahar B Rosland ◽  
Elsayed Ouda Ghonim ◽  
Latief Riyanto ◽  
Khairul Azhar B Abu Bakar ◽  
...  
Keyword(s):  
Low Cost ◽  
Power Cable ◽  
Related Data ◽  
Root Cause ◽  
Artificial Lift ◽  
Electrical Submersible Pumps ◽  
Cause Of Failure ◽  
Water Cut ◽  
Discharge Pressure

Abstract PETRONAS had embarked on an ambitious thru tubing ESP journey in 2016 and had installed global first truly rig less offshore Thru Tubing ESP (TTESP) in 2017. To replicate the success of the first installation, TTESP's were installed in Field – T. However, all these three TTESP's failed to produce fluids to surface. This paper provides the complete details of the troubleshooting exercise that was done to find the cause of failure in these wells. The 3 TTESP's in Field – T were installed as per procedure and was ready to be commissioned. However, during the commissioning, it was noticed that the discharge pressure of the ESP did not build-up and the TTESP's tripped due to high temperature after 15 – 30 mins of operation. Hence none of the 3 TTESP's could be successfully commissioned. Considering the strategic importance of TTESP's in PETRONAS's artificial lift plans, detailed troubleshooting exercise was done to find the root cause of failure to produce in these three wells. This troubleshooting exercise included diesel bull heading which gave some key pump performance related data. The three TTESP's installed in Field – T were of size 2.72" and had the potential to produce an average 1500 BLPD at 80% water cut. The TTESP deployment was fully rigless and was installed using 0.8" ESP power cable. The ESP and the cable was hung-off from the surface using a hanger – spool system. The entire system is complex, and the installation procedure needs to be proper to ensure a successful installation. The vast amount of data gathered during the commissioning and troubleshooting exercise was used for determining the failure reason and included preparation of static and dynamic well ESP model. After detailed technical investigative work, the team believes to have found the root cause of the issue which explains the data obtained during commission and troubleshooting phase. The detailed troubleshooting workflow and actual data obtained will be presented in this paper. A comprehensive list of lessons learnt will also be presented which includes very important aspects that needs to be considered during the design and installation of TTESP. The remedial plan is finalized and will be executed during next available weather window. The key benefit of a TTESP installation is its low cost which is 20% – 30% of a rig-based ESP workover in offshore. Hence it is expected that TTESP installations will pick-up globally and it's important for any operator to fully understand the TTESP systems and the potential pain points. PETRONAS has been a pioneer in TTESP field, and this paper will provide details on the learning curve during the TTESP journey.

scholarly journals Data Sanitization Framework for Computer Hard Disk Drive: A Case Study in Malaysia

2019 ◽  
Vol 10 (11) ◽  
Author(s):  
Nooreen Ashilla Binti Yusof ◽  
Siti Norul ◽  
Mohamad Firham ◽  
Nor Zarina ◽  
Monaliza Binti
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Data Sanitization

A Novel Three-Dimensional Finite Element Model to Simulate Third Body Effects on Fretting Wear of Hertzian Point Contact in Partial Slip

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Arman Ahmadi ◽  
Farshid Sadeghi
Keyword(s):  
Finite Element ◽  
Material Properties ◽  
Three Dimensional ◽  
Point Contact ◽  
Fretting Wear ◽  
Partial Slip ◽  
Wear Particles ◽  
Third Body ◽  
Stick Slip ◽  
The Third

Abstract In this investigation, a finite element (FE) model was developed to study the third body effects on the fretting wear of Hertzian contacts in the partial slip regime. An FE three-dimensional Hertzian point contact model operating in the presence of spherical third bodies was developed. Both first bodies and third bodies were modeled as elastic–plastic materials. The effect of the third body particles on contact stresses and stick-slip behavior was investigated. The influence of the number of third body particles and material properties including modulus of elasticity, hardening modulus, and yield strength were analyzed. Fretting loops in the presence and absence of wear particles were compared, and the relation between the number of cycles and the hardening process was evaluated. The results indicated that by increasing the number of particles in contact, more load was carried by the wear particles which affect the wear-rate of the material. In addition, due to the high plastic deformation of the debris, the wear particles deformed and took a platelet shape. Local stick-slip behavior over the third body particles was also observed. The results of having wear debris with different material properties than the first bodies indicated that harder wear particles have a higher contact pressure and lower slip at the location of particles which affects the wear-rate.

Numerical Simulation of Fretting Wear at the Dimple/Gimbal Interface

2013 ◽  
Author(s):  
Zhengqiang Tang ◽  
Youyi Fu ◽  
Frank E. Talke
Keyword(s):  
Friction And Wear ◽  
Disk Drive ◽  
Fretting Wear ◽  
Von Mises Stress ◽  
Experimental Measurements ◽  
Contact Interface ◽  
Surface Profiles ◽  
Von Mises ◽  
Worn Surface ◽  
Interface Geometry

A numerical model for the simulation of fretting wear at the dimple/gimbal interface of a hard disk drive suspension has been developed. The friction and wear coefficients used in the model are determined from experimental measurements. Archard’s wear equation is implemented numerically and the contact interface geometry is updated incrementally. The von Mises stress distribution and the worn surface profiles are determined.

Risk Mitigation Through the Application of New Power Umbilical Technology

2012 ◽  
Author(s):  
Alan Dobson ◽  
Steven Frazer
Keyword(s):  
Aluminum Alloy ◽  
Deep Water ◽  
Risk Mitigation ◽  
Electrical Power ◽  
Structural Response ◽  
Power Cable ◽  
Enabling Technology ◽  
Effect Analysis ◽  
Design Case Study

This paper describes the substantial service life improvements that can be achieved through a new, high technology solution developed for deep water electrical power umbilical and cable applications. The new design represents an enabling technology for power cable projects in the deepest and most dynamic waters, provides a lower risk solution for risers in highly stressed conditions and can give a technically improved solution for the range of electrical power umbilical application. The significant advantages of aluminum alloy cable bundles over traditional copper cable bundles under static and dynamic loading associated with a typical deep water floating installation are presented. A design case study is used to illustrate improvements in structural response and fatigue life associated with the aluminum alloy cable cores against conventional technologies. The paper concludes with an overview of the associated risk reduction through the implementation of the aluminum alloy cables in the form of a failure mode and effect analysis.

Wear Behavior of AuAg/AgCuNiCe/Cu Commutator in DC Micromotor: A Case Study

2010 ◽  
Vol 146-147 ◽  
pp. 825-828
Author(s):  
Yong Wang ◽  
Yong Hong Xu ◽  
Gang Yao Kuang ◽  
Ying Zhang
Keyword(s):  
Cross Section ◽  
Wear Behavior ◽  
Disk Drive ◽  
Layered Composite ◽  
Sliding Contact ◽  
Silver Layer ◽  
Small Particles ◽  
Worn Surface ◽  
Continuous Running

In this paper, continuous running test was conducted using the disk drive spindle micromotors used in automobiles DVD. The commutator and brush were made of AuAg/AgCuNiCe/Cu and AgPd/CuNiSn layered composite respectively. In order to investigate the wear behavior of the commutator, the micromotors were dissected after ran continuously for different time. The worn surface of the commutator and the brush were characterized using an SEM equipped with EDS. Also, the cross section of the commutator was analyzed. It was shown that the AuAg layer was not totally worn off until 1500 h of running test. AuAg transferred from the commutator to the brush. It was interesting that Au was found on the silver layer where the depth of wear crater surpassed the thickness of the original AuAg layer. Small particles enriched in Cu, Ni and Ce were observed on the contact surface of AgCuNiCe layer, which was thought to improve the wear resistance of the commutator. The wear mechanism was mainly slight abrasion whereas no effect of arc was found on the sliding contact area.

scholarly journals Collaborative power management in WPANs using rational controllers: a case study

2005 ◽  
Vol 2005 (5) ◽  
pp. 491-501 ◽  
Author(s):  
J. Flinn ◽  
P. T. Kabamba ◽  
W.-C. Lin ◽  
S. M. Meerkov ◽  
C. Y. Tang
Keyword(s):  
Power Consumption ◽  
Power Management ◽  
Power Saving ◽  
Disk Drive ◽  
Management Technique ◽  
Personal Area Networks ◽  
Wireless Personal Area Networks ◽  
Power Conservation ◽  
Rational Controllers

This paper addresses the issue of battery power conservation in wireless personal area networks (WPANs). Specifically, we consider a WPAN, which contains a processor and a disk drive, and develop a collaborative power management technique, which minimizes the total WPAN power consumption. Our approach is based on the theory of rational behavior, which leads to a collaborative architecture where devices in the WPAN are equipped with cooperating rational controllers (RCs). Using, as an example, the Intel 80200 XScale processor and the Hitachi 1 GB microdrive, we show that collaborative power management using RCs offers substantial power saving compared to selfish operation, where each device attempts to minimize only its own power consumption.

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