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Journal of Marine Science and Technology–Taiwan

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Articles 1081 - 1110 of 1299

Full-Text Articles in Engineering

Effects Of Surface Roughness On Porous Inclined Slider Bearings Lubricated With Micropolar Fluids, N.B. Naduvinamani, T.V. Biradar Aug 2007

Effects Of Surface Roughness On Porous Inclined Slider Bearings Lubricated With Micropolar Fluids, N.B. Naduvinamani, T.V. Biradar

Journal of Marine Science and Technology–Taiwan

This paper describes a theoretical analysis of the effect of surface roughness on the hydrodynamic lubrication of one-dimensional porous inclined slider bearings with micropolar fluids. To account for more realistic situations of the non-uniform rubbing of the bearing surfaces, it is assumed that, the probability density function for the random variable characterizing the surface roughness is asymmetrical with non-zero mean. The averaged modified Reynolds type equation is derived and the closed form expressions for the bearing characteristics are obtained. The numerical computations of the results show that, the performance of the porous inclined slider bearing is improved for the micorpolar …

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The Assessment Of River Ecology And Habitat Using A Two-Dimensional Hydrodynamic And Habitat Model, Ray-Shyan Wu, Chen-Tai Mao Aug 2007

The Assessment Of River Ecology And Habitat Using A Two-Dimensional Hydrodynamic And Habitat Model, Ray-Shyan Wu, Chen-Tai Mao

Journal of Marine Science and Technology–Taiwan

The assessment of river ecology is an integral part of river planning and management today. In any project, the simulation and quantification of river habitat and ecology is as important as the simulation of the hydrodynamics of the river. Currently in Taiwan, the use of one-dimensional models, such as Phabsim and Rhabsim, are widespread in the evaluation of river ecology and habitat. These models use data from the river cross-section and bed roughness coefficient to estimate habitat area. However, the use of these models is limited in small-scale or complex river conditions. This study applies a two-dimensional hydrodynamic and habitat …

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Modeling And Control Of A New 1/4t Servo-Hydraulic Vehicle Active Suspension System, Jyh-Chyang Renn, Tsung-Han Wu Jun 2007

Modeling And Control Of A New 1/4t Servo-Hydraulic Vehicle Active Suspension System, Jyh-Chyang Renn, Tsung-Han Wu

Journal of Marine Science and Technology–Taiwan

Nowadays, the active suspension is the key technology for vehicles to achieve both ride comfort and control performance. In this paper, a new 1/4T servo-hydraulic vehicle active suspension system is developed and two control schemes are utilized. The first one is a conventional PID controller obtained from Ziegler-Nichols method and the second one is the neural network controller. Though these two controllers are quite simple and not new, it is still worth mentioning that this paper emphasizes on the engineering aspects including the design of a servo-hydraulic test rig, the implementation technology of the controllers and the subsequent experimental study. …

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Inverse Time Translational Symmetry Of The Wave Equation For Blatz-Ko Cylinders, Hin-Chi Lei, Sheng-Wei Chen Jun 2007

Inverse Time Translational Symmetry Of The Wave Equation For Blatz-Ko Cylinders, Hin-Chi Lei, Sheng-Wei Chen

Journal of Marine Science and Technology–Taiwan

The symmetries for the wave equation governing the radial deformations of circular cylinders composed of Blatz-Ko materials are studied. It is found that the wave equation possesses a special symmetry --- the inverse time translational symmetry (ITTS) named by us. We find that this special symmetry is not possessed by the wave equations for cylinders composed of other two compressible elastic materials. However, it appears again when we study the invariant properties of the wave equation governing radially deformed BlatzKo spheres and the one governing Blatz-Ko blocks in uniaxial tensile motion. We therefore infer that ITTS is a special property …

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Ultra-High Strength Steel Fiber Reinforced Concrete For Strengthening Of Rc Frames, Yung-Chih Wang, Ming-Gin Lee Jun 2007

Ultra-High Strength Steel Fiber Reinforced Concrete For Strengthening Of Rc Frames, Yung-Chih Wang, Ming-Gin Lee

Journal of Marine Science and Technology–Taiwan

Reinforced concrete (RC) structure strengthened with ultra-high steel fiber reinforced concrete (UFC) is introduced in the study. Interior RC beam-column joint sub-assemblages strengthened by means of joint replacement with UFC are tested cyclically to observe their seismic performance. Prior to frame testing, UFC mechanical properties, for example the compressive, flexural, rebar bonding, and slant shear strengths, and durability are examined and discussed. The material test results indicate that the UFC displays excellent performance in terms of mechanical and durable behavior. The frame test results show that the UFC-replaced joint frame behaves very well in seismic resistance. Its performance is even …

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Piv Measurements Of Exit Flow Field Of Centrifugal Fans With Conditional Sampling, Shun-Chang Yen, Jung-Hsuan Liu Jun 2007

Piv Measurements Of Exit Flow Field Of Centrifugal Fans With Conditional Sampling, Shun-Chang Yen, Jung-Hsuan Liu

Journal of Marine Science and Technology–Taiwan

In this research, we have experimented with two centrifugal fans with the same geometrical configuration. These two fans are designed to rotate at different speeds driven with the same voltage. The Particle Image Velocimetry (PIV) method is applied to measure the instantaneous flow fields at the near-exit region. The AMCA 210 wind tunnel is used to find the efficiency and the performance coefficients. The velocity vectors, streamlines, vorticity contours, velocity distributions, flow rate, and performances are also presented and discussed. We find that higher rotation speed yields better efficiency.

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An Experimental Study Of Wave Forces On Vertical Breakwater, Yung-Fang Chiu, Jaw-Guei Lin, Shang-Chun Chang, Yin-Jei Lin, Chia-Hsin Chen Jun 2007

An Experimental Study Of Wave Forces On Vertical Breakwater, Yung-Fang Chiu, Jaw-Guei Lin, Shang-Chun Chang, Yin-Jei Lin, Chia-Hsin Chen

Journal of Marine Science and Technology–Taiwan

In this study, a series of hydraulic model tests with regular/ irregular waves was carried out in a wave flume to investigate the wave forces acting on a composite-type breakwater. Waves in front of the breakwater, wave pressures on the vertical wall and at the bottom of caisson were measured simultaneously. The maximum horizontal force and uplift force were calculated and compared with Goda’s wave force theories. The results had shown that Goda’s theories offer higher safety factor. However, the measured uplift force was smaller than Goda’s and nonzero at the land-side end of the bottom which might be caused …

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Study On The Characteristics Of Tiller Blade Shapes By Spray-Welding Hardening, Jain-Song Ju Jun 2007

Study On The Characteristics Of Tiller Blade Shapes By Spray-Welding Hardening, Jain-Song Ju

Journal of Marine Science and Technology–Taiwan

This study attempts to validate and analyze the mathematical models of the plowing dynamics and trajectory curve for tiller and cultivation blades of a rotary cultivator. Both blades are extensively used in Taiwan. The blade must be protected from intertwisting to ensure high efficiency and uniform resistance of the plow to soil. Theoretical and calculated cutting angles are found to be 85.88° and 84.28°, respectively, while the theoretical and calculated edge-curve angles are 59.70° and 58.31°. The present data confirmed that the tiller blades developed by local companies are suitable for the plowing environment in Taiwan. In order to reduce …

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Observer-Based Fuzzy Covariance Control For Discrete Nonlinear Systems, Wen-Jer Chang, Yi-Lin Yeh Jun 2007

Observer-Based Fuzzy Covariance Control For Discrete Nonlinear Systems, Wen-Jer Chang, Yi-Lin Yeh

Journal of Marine Science and Technology–Taiwan

In this paper, the practical covariance control theory is applied to incorporate the concept of variance constrained control for the discrete nonlinear systems using T-S fuzzy models. This paper focuses on the control problem of finding observed-state feedback gains for the discrete fuzzy controllers, which can achieve the common state covariance assignment. Finally, a numerical example will be used to show the simulation results of the present fuzzy control method and usefulness of the proposed approach.

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Stochastic Chaotic Motion Of Ships In Beam Seas, Li-Qin Liu, You-Gang Tang, Hong-Xia Li Apr 2007

Stochastic Chaotic Motion Of Ships In Beam Seas, Li-Qin Liu, You-Gang Tang, Hong-Xia Li

Journal of Marine Science and Technology–Taiwan

The stochastic chaotic motion and the threshold intensity of the external excitation force for onset of chaos of the ships in random beam waves are studied by the nonlinear stochastic dynamics theory. The random differential equation of ships’ rolling motion is established with considering the nonlinear damping, nonlinear restoring moment and the white noise wave excitation. The random Melnikov mean-square criterion is used to determine the threshold intensity for onset of chaos. The probability density function of the rolling response is calculated through solving the stochastic differential equations by applying the path integral method in the chaotic region. It is …

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Study Of The Flow Field And Scalar Transport Of Indoor Ventilating Space Under The Impact Of Coanda Vortex, Je-Ee Ho, Hong-Tsu Young Apr 2007

Study Of The Flow Field And Scalar Transport Of Indoor Ventilating Space Under The Impact Of Coanda Vortex, Je-Ee Ho, Hong-Tsu Young

Journal of Marine Science and Technology–Taiwan

The vortex in the flow field will isolate the space to further reduce the indoor air exchange and convective efficiency. The Coanda vortex accompanied by the inlet jet usually has the most active effect on the flow field. Both its location and scalar size which are primary determined by the strength of the injected flow and the arrangement of inlet; outlet will deeply affect the air-exchange volume, even reduce the available ventilation space. A 2-D turbulent model with SIMPLE method is set up to simulate the air motion of indoors; it can easily describe the working of Coanda vortex in …

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Internal Model Control Using Neural Network For Ship Roll Stabilization, Fuat Alarçïn Apr 2007

Internal Model Control Using Neural Network For Ship Roll Stabilization, Fuat Alarçïn

Journal of Marine Science and Technology–Taiwan

In this paper, a neural network (NN) based on internal model control (IMC) is developed to adjust control parameters for roll motions of a container ship. Controller architecture, which combines neural network with internal model control, has been outlined and its effectiveness demonstrated on the container ship roll stabilizer. The control signal error is used with back-propagation algorithm to update the weights of the neural controller. In conclusion, the neural network based on internal model control systems are analyzed, and compared to classical PID control results. As can be seen from numerical results, the NN based on IMC is implemented …

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An Experimental Study On Progressive Wave-Induced Stresses Duration In Seabed Soil, Shang-Chun Chang, Lien-Kwei Chien, Jaw-Guei Lin, Yung-Feng Chiu Apr 2007

An Experimental Study On Progressive Wave-Induced Stresses Duration In Seabed Soil, Shang-Chun Chang, Lien-Kwei Chien, Jaw-Guei Lin, Yung-Feng Chiu

Journal of Marine Science and Technology–Taiwan

The total stress behavior in seabed soil induced by progressive waves was investigated in time sequence through the experiments in a wave flume. The static stress measurements show that the natural deposit seabed retains an initial shear stress that reduces the resistance capacity of shear strength of the soil. The dynamic stress measurements show that, by comparing with seabed surface pressure, the vertical stress, horizontal stress, and pore water pressure are found to have different phase shifts. Such phase shifts strongly affect the duration behavior of the total stresses of the soil and different from the current theories that assume …

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The Relationship Between The Location Of Obstacle And Indoor Particle Deposition, Je-Ee Ho, Hong T. Young Feb 2007

The Relationship Between The Location Of Obstacle And Indoor Particle Deposition, Je-Ee Ho, Hong T. Young

Journal of Marine Science and Technology–Taiwan

An appropriate ventilation system design not only increases the indoor ventilation effect but effectively improves the particle concentration distribution. The locations of indoor furniture are used to analyze the indoor airflow and particle distribution by numerical skill in this study. Also, a 45 cm × 45 cm × 45 cm chamber is setup as experiment apparatus which is made by acrylic resin board with 16 holes connected to supply air flow. In order to simulate the furniture effect, some wooden blocks are located at the chamber. The temperature and humidity sensors are connected to the data acquisition system with a …

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Associating Characterization Bentonite-Based Buffer/Backfill Materials By Distribution Ratio And Plastic Index (Pi), Yi-Lin Jan, Shih-Chin Tsai, Chun-Nan Hsu Feb 2007

Associating Characterization Bentonite-Based Buffer/Backfill Materials By Distribution Ratio And Plastic Index (Pi), Yi-Lin Jan, Shih-Chin Tsai, Chun-Nan Hsu

Journal of Marine Science and Technology–Taiwan

Choosing buffer materials with the required engineering and sorption characteristics for radwaste disposal is very important. This work investigates the relationships between engineering characteristics (plastic index; PI) and sorption properties (distribution ratio; Rd) for two mixed buffer materials that are composed of bentonite/quartz sand and bentonite/laterite, to provide an overall functional evaluation of buffer materials. Se is the nuclide of interest, and both synthetic groundwater (GW) and seawater (SW) were employed in batch sorption experiments. Deionized water (DIW) was used in engineering property tests. SW and GW were also used to evaluate the effects on PI. The results indicate that …

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Hybrid Recursive Particle Swarm Optimization Learning Algorithm In The Design Of Radial Basis Function Networks, Ching-Yi Chen, Hsuan-Ming Feng, Fun Ye Feb 2007

Hybrid Recursive Particle Swarm Optimization Learning Algorithm In The Design Of Radial Basis Function Networks, Ching-Yi Chen, Hsuan-Ming Feng, Fun Ye

Journal of Marine Science and Technology–Taiwan

In this paper, an innovative hybrid recursive particle swarm optimization (HRPSO) learning algorithm with normalized fuzzy cmean (NFCM) clustering, particle swarm optimization (PSO) and recursive least-squares (RLS) is proposed to generate radial basis function networks (RBFNs) modeling system with small numbers of descriptive radial basis functions (RBFs) for fast approximating two complex and nonlinear functions. Simulation results demonstrate that the generated NFCM-based learning schemes approach the desired modeling systems within the smaller population sizes.

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Optimal Allocation Of Heat Transfer Area For A Refrigeration Plant, Tong-Bou Chang Feb 2007

Optimal Allocation Of Heat Transfer Area For A Refrigeration Plant, Tong-Bou Chang

Journal of Marine Science and Technology–Taiwan

For an internally reversible refrigerant plant, Bejan proposed an optimal way of dividing the area ratio of heat transfer for the hot end and cold end heat exchangers. In the present study, an optimal design of a refrigeration plant has been developed by considering both the external and internal irreversibilities. The internal irreversibility is modeled by a heat bypass which represents the actual internal heat leak and the friction losses due to mechanism movement. A more general formulation than previous study of optimal area-ratio is obtained in this study. For the case of no internal irreversibility, this formulation is exactly …

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Functional Model Of Cost And Time For Highway Construction Projects, Jin-Fang Shr, Wei-Tong Chen Dec 2006

Functional Model Of Cost And Time For Highway Construction Projects, Jin-Fang Shr, Wei-Tong Chen

Journal of Marine Science and Technology–Taiwan

It is commonly accepted that construction cost, time and quality performance has been regarded as the major success factors for a construction project. With the increasing use of innovative contracts in highway construction, the relationship between construction cost and time has become more crucial than ever. Improved control of time value has become necessary, for quantifying the functional relationship between construction cost and time. This study explores the functional relationship between highway construction cost and time. Data from projects of the Florida Department of Transportation (FDOT) in the US is utilized to develop and illustrate the quantifying model. The proposed …

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Emergence Of Attached Recirculating Eddy For Flow Around A Circular Cylinder Asymmetrically Placed In A Channel, Tsung-Chan Hsieh, Jiahn-Horng Chen Dec 2006

Emergence Of Attached Recirculating Eddy For Flow Around A Circular Cylinder Asymmetrically Placed In A Channel, Tsung-Chan Hsieh, Jiahn-Horng Chen

Journal of Marine Science and Technology–Taiwan

This study discusses the emergence and development of cylinder-attached recirculating regions appearing in a fully developed flow past a circular cylinder asymmetrically confined between two infinite parallel plates. We employed a finite-volume method with the SIMPLE algorithm to compute the flow fields for various sizes and asymmetrical settings of circular cylinders. Two geometrical parameters, the blockage and asymmetry coefficients, are varied in computations. A series of computations show that the flow evolves a single asymmetrical recirculating region for the Reynolds number beyond some critical value. Its development in length bears a linear relation to the Reynolds number. Its growth rate …

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A Case Study Of Inter-Arrival Time Distributions Of Container Ships, Tu-Cheng Kuo, Wen-Chih Huang, Sheng-Chieh Wu, Pei-Lun Cheng Dec 2006

A Case Study Of Inter-Arrival Time Distributions Of Container Ships, Tu-Cheng Kuo, Wen-Chih Huang, Sheng-Chieh Wu, Pei-Lun Cheng

Journal of Marine Science and Technology–Taiwan

Given the recent prevalence of periodical container liners, the applicability of related models of widely applied queuing theory is left in doubt. Since they focus on marine liners, the distribution pattern is always considered to be a deterministic distribution for periodical schedule. In order to investigate the distribution patterns of container liners, observation units are segmented into single shipping liners, single berths, single container terminals and entire ports. The evolution of the ship arrival distribution pattern and the goodness-of-fit test for observation are based on the ship dynamic data of international harbors in Taiwan. This study aims to implement tests …

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Web Services Of Mms Applications On Mobile Devices, Cheng-Chih Yang, Cheng-Min Lin Dec 2006

Web Services Of Mms Applications On Mobile Devices, Cheng-Chih Yang, Cheng-Min Lin

Journal of Marine Science and Technology–Taiwan

This study develops the Web services that are applied in Multimedia Message Service (MMS) applications via the Internet and operated by mobile portable devices, such as Personal Digital Assistant (PDA) and cellular phone. First, a MMS system environment and architecture is modeled. Next, the operations and interface of the MMS system is defined by the Web Services Description Language (WSDL) to represent the web services on MMS application system. Finally, two system prototypes are described in this study that includes distance video cam monitor system and GPRS cellular phone MMS sender.

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Particle Swarm Optimization For Global Optimization Problems, Hsin-Chuan Kuo, Jiang-Ren Chang, Ching-Hsiang Liu Dec 2006

Particle Swarm Optimization For Global Optimization Problems, Hsin-Chuan Kuo, Jiang-Ren Chang, Ching-Hsiang Liu

Journal of Marine Science and Technology–Taiwan

In this paper, the particle swarm optimization (PSO), originated as a simulation of a simplified social system with swarm intelligence and having exploring and exploiting characteristics of the particle swarm, is adopted to deal with the global optimization problems. To begin with, four non-linear two-dimensional functions are adopted as benchmark examples for determining the suitable ranges of parameters in the PSO. It is found that uses of the PSO can make the search quickly converge to the global optimum. Then, several benchmark functions below ten-dimensions are adopted especially for comparisons of search efficiency on the PSO and other algorithms. Results …

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Debt Ratio Analysis Of Taiwan??Property Development Firms Under Contraction, Chao-Hui Wu, Ting-Ya Hsieh Sep 2006

Debt Ratio Analysis Of Taiwan??Property Development Firms Under Contraction, Chao-Hui Wu, Ting-Ya Hsieh

Journal of Marine Science and Technology–Taiwan

This study analyzes the correlation between debt ratios and corporate performance of the property development firm during times of contraction in Taiwan. This study collects and examines financial data for the period 1992 to 2003 for 25 listed property development firms. A total of 16 financial ratios, collectively representing corporate performance, were statistically checked with three types of debt ratios. The comparison results reveal that profitability related ratios are inadequate representations of corporate performance. Especially, investors consider a vigorous dividends policy to indicate a crisis. Two positive directions for property development firms during a contraction include (1) product differentiation and …

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Dynamic Relationship Of Steel Prices Between Two Different Markets:Taiwan And Mainland China, Yong-Huang Lin, Yun-Wu Wu Sep 2006

Dynamic Relationship Of Steel Prices Between Two Different Markets:Taiwan And Mainland China, Yong-Huang Lin, Yun-Wu Wu

Journal of Marine Science and Technology–Taiwan

Price variation is one of the major factors taken into account in cost control decision in construction projects. Previous researches have focused on the short-term price prediction of a merchandise within a closed single market without considering the long-term effect by interacting with other markets. The econometric methods such as structural break test, co-integration analysis, and Granger causality test were used to examine the dynamic short-term and long-term relationships of steel prices between two different markets, Taiwan and China, over the period of 1995 ~ 2004. The steel price of China was found to have the leading discovery function by …

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Determining The Repair Ranking Of Existing Rc Bridges Using Least Squares Technique Associated With Comparison Matrix Method, Ming-Te Liang, Chin-Ming Lin, Wen-Hu Tsao, Chi-Jang Yeh Sep 2006

Determining The Repair Ranking Of Existing Rc Bridges Using Least Squares Technique Associated With Comparison Matrix Method, Ming-Te Liang, Chin-Ming Lin, Wen-Hu Tsao, Chi-Jang Yeh

Journal of Marine Science and Technology–Taiwan

The principal objective of this paper is employed the least squares technique associated with comparison matrix method to determine the repair ranking of existing reinforced concrete (RC) bridges with bestridden or non-bestridden river. Six existing RC bridges in Taiwan are given as an illustrative example. For verifying the feasibility and reliability of the proposed method, the D (Degree) E (Extent) R (Relevancy) evaluation method, which is only considered the RC bridges built on river bed and is now widely used to evaluate the damage grade for existing RC bridges in Taiwan, is also adopted to assessing the same six existing …

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Minimizing The Makespan In A Two-Stage Flowshop Scheduling Problem With A Function Constraint On Alternative Machines, Chou-Jung Hsu, Wen-Hung Kuo, Dar-Li Yang, Maw-Sheng Chern Sep 2006

Minimizing The Makespan In A Two-Stage Flowshop Scheduling Problem With A Function Constraint On Alternative Machines, Chou-Jung Hsu, Wen-Hung Kuo, Dar-Li Yang, Maw-Sheng Chern

Journal of Marine Science and Technology–Taiwan

In this paper, we consider a two-stage flowshop scheduling problem with a function constraint on alternative machines. The objective is to minimize the makespan. We show that the proposed problem is NP-hard and provide some heuristic algorithms and computational experiments. In addition, from the experimental results, the modification of Johnson’s rule combined with the First-Fit rule is the best heuristic algorithm of the proposed heuristic algorithms.

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Wavelet-Based Shift-Invariant Noise Model, Fu-Tai Wang, Jenny Chih-Yu Lee, Shun-Hsyung Chang Sep 2006

Wavelet-Based Shift-Invariant Noise Model, Fu-Tai Wang, Jenny Chih-Yu Lee, Shun-Hsyung Chang

Journal of Marine Science and Technology–Taiwan

This paper proposes the use of shift-invariant dual-tree discrete wavelet transform (DT DWT) noise model to the problem of a multipath signal detection in underwater environment. The design procedure for this adaptive model of the background noise is described. When an input signal is shifted, as in a multipath environment, this shift-invariant DT DWT can generate multi-resolution subspaces. Each of them keeps more coefficient energy of this signal than DWT’s. The result of computer simulations shows that this method can improve the performance of a multipath signal detection, by reducing the false alarm probability in a range of different signal-tonoise …

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Determining The Repair Ranking Of Existing Rc Bridges Using Least Squares Technique Associated With Comparison Matrix Method, Ming-Te Liang, Chin-Ming Lin, Wen-Hu Tsao, Chi-Jang Yeh Sep 2006

Determining The Repair Ranking Of Existing Rc Bridges Using Least Squares Technique Associated With Comparison Matrix Method, Ming-Te Liang, Chin-Ming Lin, Wen-Hu Tsao, Chi-Jang Yeh

Journal of Marine Science and Technology–Taiwan

The principal objective of this paper is employed the least squares technique associated with comparison matrix method to determine the repair ranking of existing reinforced concrete (RC) bridges with bestridden or non-bestridden river. Six existing RC bridges in Taiwan are given as an illustrative example. For verifying the feasibility and reliability of the proposed method, the D (Degree) E (Extent) R (Relevancy) evaluation method, which is only considered the RC bridges built on river bed and is now widely used to evaluate the damage grade for existing RC bridges in Taiwan, is also adopted to assessing the same six existing …

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Averaged Inertia Principle For Non-Newtonian Squeeze Films In Wide Parallel Plates: Couple Stress Fluid, Jaw-Ren Lin, Chi-Ren Hung, Rong-Fang Lu Sep 2006

Averaged Inertia Principle For Non-Newtonian Squeeze Films In Wide Parallel Plates: Couple Stress Fluid, Jaw-Ren Lin, Chi-Ren Hung, Rong-Fang Lu

Journal of Marine Science and Technology–Taiwan

On the basis of the Stokes micro-continuum theory, the combined effects of non-Newtonian couple stresses and convective fluid inertia forces upon the squeeze film characteristics of two wide parallel plates are investigated by using the averaged inertia principle. A numerical solution of the film height versus response time is calculated by using the fourth-order Runge-Kutta method. Compared to the Newtonian-lubricant non-inertia case of Hamrock [4], the qualitative effects of couple stresses and convective inertia forces provide an increase in the film pressure, the load capacity and the response time. Moreover, the quantitative effects are more pronounced for wide parallel plates …

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Dynamic Characteristics Of Wide Exponential Film-Shape Slider Bearings Lubricated With A Nonnewtonian Couple Stress Fluid, Jaw-Ren Lin, Rong-Fang Lu, Chi-Ren Hung Jun 2006

Dynamic Characteristics Of Wide Exponential Film-Shape Slider Bearings Lubricated With A Nonnewtonian Couple Stress Fluid, Jaw-Ren Lin, Rong-Fang Lu, Chi-Ren Hung

Journal of Marine Science and Technology–Taiwan

On the basis of the Stokes micro-continuum theory, the nonNewtonian effects of couple stress fluids upon the dynamic characteristics of wide exponential-shaped slider bearings are presented in this paper. To take into account the couple stress effects arising from a Newtonian lubricant blended with various additives, the nonNewtonian couple-stress dynamic Reynolds-type equation is applied to calculate the bearing dynamics. According to the results obtained, the effects of couple stresses signify a decrease in the friction parameter and the volume flow rate, as well as an increase in the loadcarrying capacity, the dynamic stiffness coefficient and the dynamic damping coefficient for …

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