Tracking Dynamics of In-line Suspensions in High-Performance Rigid Disk Drives with Rotary Actuators

1992 ◽  
Vol 114 (1) ◽  
pp. 67-73 ◽  
Author(s):  
S. S. Chiou ◽  
D. K. Miu
Keyword(s):  
High Performance ◽  
Large Angle ◽  
Primary Source ◽  
Operating Conditions ◽  
Disk Drives ◽  
Element Analysis ◽  
Rigid Disk ◽  
Actual Operating ◽  
Load Beam ◽  
Small Form Factor

The laser Doppler interferometric modal measurement technique is combined with finite element analysis to study the dynamics of in-line suspensions under actual operating conditions in commercially available small form factor rigid disk drives equipped with rotary actuators. It is shown that the sway mode, which is a result of in-plane bending of the load beam, is the primary source of radial slider motions and contributes significantly to off-track error. It is also shown that the initial deformed geometry of the suspension, which is determined by the boundary condition during large angle deflection and the nature of the pre-bend shape, has direct effects on the in-plane stiffness of the suspension and therefore the sway mode frequency.

scholarly journals Design and Simulation of a Capless Low Drop Out Voltage Regulator

2021 ◽  
pp. 69-75
Author(s):  
Babitha S ◽  
Mr. Hemanth Naidu K J ◽  
Mr. Ashwin Goutham G ◽  
Mr. Harshith S V
Keyword(s):  
High Performance ◽  
Primary Source ◽  
Operating Conditions ◽  
Drop Out ◽  
Voltage Regulator ◽  
Portable Devices ◽  
Current Amplifier ◽  
Power Resources ◽  
Error Amplifier ◽  
The Stability

Portable electronic devices mostly used battery as their primary source for operation hence longer running batteries or Power resources or vital for any portable device need for stable voltage supplies have led to the development of low dropout voltage regulators low dropout regulators provide stable regulated output voltage in various operating conditions which makes it useful in portable devices that design of high performance and stable low dropout voltage regulator is a challenge nowadays with decreasing device size and increasing power densities. The proposed circuit used a 5pack architecture of error amplifier. This paper proposes the study of behavior of the LDO voltage regulator with internal capacitors i.e., capless. The regulated voltage of 1.8V is obtained using the typical power supply of 2.2V obtained dropout voltage of 400mv with the delay of 12.77micro sec, power consumed 1.816W. The proposed design produced DC gain of 31.77db,with the load current variation of 0 to 20mA. The capless LDO architecture is verified in the Cadence 180nm technology. The architecture provides a stable gain and plot for both Temperature and Load Variations. The stability issues are overcome using the compensation techniques which uses a current amplifier and a capacitor in the differentiator configuration. The current amplifier implemented uses current mirror with current copying ratio of unity.

scholarly journals The Optimization Design of Short-Term High-Overload Permanent Magnet Motors Considering the Nonlinear Saturation

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3272 ◽  
Author(s):  
Yu-Xi Liu ◽  
Li-Yi Li ◽  
Ji-Wei Cao ◽  
Qin-He Gao ◽  
Zhi-Yin Sun ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Performance ◽  
Optimization Design ◽  
Magnetic Energy ◽  
Permanent Magnet Synchronous Motor ◽  
Industrial Applications ◽  
Operating Conditions ◽  
Nonlinear Saturation ◽  
Short Term ◽  
Element Analysis

Electric actuators with fast dynamic response and high torque density are widely used in aerospace and industrial applications. In this paper, the design and optimization of a short-term high-overload permanent magnet synchronous motor (STHO-PMSM) is presented. The rated working point is optimized according to the operating conditions of the motor. The effect of electromagnetic load on the extreme torque which mainly include ampoule number and the magnetic energy of the PM is researched. Due to the nonlinear saturation influence, the equivalent magnetic network model is established. The saturation torque discount factor is proposed to quantify the degree of the core magnetic saturation. Winding temperature model is presented to inspect the motor reliability. To verify the feasibility and accuracy of mathematical model analysis (MMA), the performance of the motor in different currents is investigated compared to the finite element analysis (FEA). A prototype motor is manufactured and tested. The results of the MMA, FEA, and experiment show that the designed motor can achieve the high performance with the 10 times overload in a short time. The method of the MMA can relatively accurately predict as well as take less time consumption.

Innovative Design and Optimization of Molded Honeycomb Mold

2010 ◽  
Vol 102-104 ◽  
pp. 358-362
Author(s):  
Su Chang Ma ◽  
Bing Yan ◽  
Ping Liu ◽  
Run Hua Tan
Keyword(s):  
Operating Conditions ◽  
Analysis Method ◽  
Practical Application ◽  
Element Analysis ◽  
Innovative Design ◽  
Design And Optimization ◽  
Finite Element Analysis Method ◽  
Actual Operating ◽  
The Finite Element Analysis ◽  
Analysis Platform

Considering the low productivity of fixed molded honeycomb mold, an efficient turning molded honeycomb mold is developed. Using TRIZ theory, a technical analysis of fixed molded honeycomb mold is conducted. Through the TRIZ innovation principles of the Spheroidality, combined with the characteristics of the mold, innovative design of the rotary molded honeycomb mold has been made. According on the Pro/MECHANICA analysis platform, by the finite element analysis method, the actual molded honeycomb mold forces, boundary conditions and imposed load are being researched in the view of the molded honeycomb mold for the actual operating conditions. The sensitivity analysis of mold parameters is conducted so as to optimize the structure parameters of mold. Shown by the practical application, the rotary molded mold can improve the productivity significantly.

Effects of Fission Profiles on the Performance of a U-10Mo Fuel Plate

2019 ◽  
Author(s):  
Hee Seok Roh ◽  
Walid Mohamed ◽  
Hakan Ozaltun
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
Experimental Tests ◽  
Operating Conditions ◽  
Fuel Performance ◽  
Element Analysis ◽  
Actual Use ◽  
Enriched Uranium ◽  
Performance Research ◽  
Plate Geometry

Abstract In order to convert the high-performance research reactors from High Enriched Uranium (HEU) to Low Enriched Uranium (LEU) fuel, U-Mo alloy-based fuels in monolithic form have been proposed. These plate-type fuels consist of a high density and low enriched uranium (LEU) foil coated with a diffusion barrier and encapsulated with the aluminum cladding. The performance of the fuel plate has been evaluated by many studies through experimental tests and numerical analyses. When evaluating the performance of a fuel, it is expensive and time-consuming to consider a variation of several parameters, such as fuel plate geometry, material properties, and operating conditions. Fission profile is a critical component of the fuel performance analysis, causing swelling and creep deformation of the fuel plate. Therefore, it can directly affect the stress and strain distributions over the fuel plate. This study aims at investigating the effect of different fission profiles on the thermo-mechanical performance of the fuel plate by finite element analysis. To investigate the effect of fission profile on fuel performance, several different fission profiles were generated and analyzed. The fission profiles were generated based on actual use.

Design Aspects of a Cardiac Action Hydraulic Pump

2015 ◽  
Author(s):  
Mohamed Elgamil ◽  
Khaled Mostafa ◽  
Marwan El-Husseiny ◽  
Saad Kassem
Keyword(s):  
High Performance ◽  
High Pressures ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Hydraulic Pump ◽  
Element Analysis ◽  
Flow Rates ◽  
Control Chamber ◽  
Chamber Volume ◽  
Cardiac Action

This paper presents some design aspects of a high pressure cardiac action hydraulic pump consisting of several pumping heads. Each head has a set of followers that completely encircle a cam. The followers separate a pumping chamber, formed between the cam and the followers, from a control chamber existing outside the followers. With the cam rotation the followers move outwards and inwards with respect to the cam, causing the pumping chamber volume to increase and decrease to suck and pump oil. The pump geometric volume can be controlled by controlling the stroke of the followers through the control of the oil volume in the control chamber. Three different methods are proposed to transmit the motion from the cam to the followers. In the first method the followers are in direct contact with the cam, while in the second intermediate cylindrical rollers are inserted between the followers and the cam. In the third method, specially shaped pads are inserted between the cam and the followers. Finite element analysis (FEA) using ANSYS Mechanical software is carried out to compare between these methods regarding the generated contact stresses between the cam and the followers. FEA is also utilized to design a self-integrated priming spring in the external lips of the followers in order to allow smooth pump start up at all operating conditions. The suction and delivery valves of this pump are crucial for its reliability and high performance. They should allow high flow rates at small pressure drop and should be compact, of low inertia to operate at high frequency, and of minimum deformation under high pressures. A CFD analysis for a proposed design for these valves is performed using ANSYS/FLUENT program on three-dimensional models, where the flow rates, the pressure and velocity distributions, and the deformations of these elements are calculated.

Parallel Computing for Tire Simulations

2011 ◽  
Vol 39 (3) ◽  
pp. 193-209 ◽  
Author(s):  
H. Surendranath ◽  
M. Dunbar
Keyword(s):  
High Performance ◽  
Effective Means ◽  
Cost Effective ◽  
Turnaround Time ◽  
Careful Consideration ◽  
Rolling Contact ◽  
Element Analysis ◽  
Parallel Solvers ◽  
Design Changes ◽  
Highly Nonlinear

Abstract Over the last few decades, finite element analysis has become an integral part of the overall tire design process. Engineers need to perform a number of different simulations to evaluate new designs and study the effect of proposed design changes. However, tires pose formidable simulation challenges due to the presence of highly nonlinear rubber compounds, embedded reinforcements, complex tread geometries, rolling contact, and large deformations. Accurate simulation requires careful consideration of these factors, resulting in the extensive turnaround time, often times prolonging the design cycle. Therefore, it is extremely critical to explore means to reduce the turnaround time while producing reliable results. Compute clusters have recently become a cost effective means to perform high performance computing (HPC). Distributed memory parallel solvers designed to take advantage of compute clusters have become increasingly popular. In this paper, we examine the use of HPC for various tire simulations and demonstrate how it can significantly reduce simulation turnaround time. Abaqus/Standard is used for routine tire simulations like footprint and steady state rolling. Abaqus/Explicit is used for transient rolling and hydroplaning simulations. The run times and scaling data corresponding to models of various sizes and complexity are presented.

Accelerated testing of super lightweight UHPC waffle deck under heavy vehicle simulator

2021 ◽  
Vol 16 (2-3) ◽  
pp. 61-74
Author(s):  
Sahar Ghasemi ◽  
Amir Mirmiran ◽  
Yulin Xiao ◽  
Kevin Mackie
Keyword(s):  
High Performance ◽  
Failure Modes ◽  
High Performance Concrete ◽  
High Strength ◽  
Heavy Vehicle ◽  
Wheel Load ◽  
Element Analysis ◽  
Vehicle Simulator ◽  
Pavement Testing ◽  
Heavy Vehicle Simulator

A super lightweight deck can enhance load rating and functionality of a bridge, especially those identified as structurally deficient. This study was aimed to develop and experimentally validate a novel bridge deck as an ultra-lightweight low-profile waffle slab of ultra-high-performance concrete (UHPC) with either carbon fiber reinforced polymer (CFRP) or high strength steel (HSS) reinforcement. The proposed system lends itself to accelerated bridge construction, rapid deck replacement in bridges with load restrictions, and bridge widening applications without the need to replace girders. Performance and failure modes of the proposed deck were initially assessed through extensive lab experiments and finite element analysis, which together confirmed that the proposed deck panel meets the AASHTO LRFD requirements. The proposed deck system is not susceptible to punching shear of its thin slab and fails in a rather ductile manner. To evaluate its long-term performance, the system was further tested under the dynamic impact of wheel load at the Accelerated Pavement Testing (APT) facility of the Florida Department of Transportation using a Heavy Vehicle Simulator (HVS).

scholarly journals Electromagnetic-Thermal Integration Design of Permanent Magnet Motor for Vehicles

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Shijun Chen ◽  
Qi Zhang ◽  
Surong Huang
Keyword(s):  
Permanent Magnet ◽  
High Performance ◽  
Design Method ◽  
Electromagnetic Properties ◽  
Permanent Magnet Motor ◽  
Element Analysis ◽  
Experiment Platform ◽  
Motor Design ◽  
Dimensional Parameters ◽  
Thermal Integration

To more efficiently design high performance vehicular permanent magnet motor, an electromagnetic-thermal integration design method is presented, which considers both the electromagnetic properties and the temperature rise of motor winding when determining the main dimensional parameters of the motor. Then a 48-slot and 8-pole vehicular permanent magnet motor is designed with this method. The thermomagnetic coupling design is simulated and validated on the basis of multiphysical domain on finite element analysis. Then the prototype is analyzed and tested on a newly built motor experiment platform. It is shown that the simulation results and experimental results are consistent, which validate the accuracy and effectiveness of the new design method. Also this method is proved to well improve the efficiency of permanent magnet motor design.

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