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| 1 | Position Control of Electro-hydraulic Actuator System Using Fuzzy Logic Controller Optimized by Particle Swarm Optimization显示文摘The position control system of an electro-hydraulic actuator system (EHAS) is investigated in this paper. The EHAS is developed by taking into consideration the nonlinearities of the system: the friction and the internal leakage. A variable load that simulates a realistic load in robotic excavator is taken as the trajectory reference. A method of control strategy that is implemented by employing a fuzzy logic controller (FLC) whose parameters are optimized using particle swarm optimization (PSO) is proposed. The scaling factors of the fuzzy inference system are tuned to obtain the optimal values which yield the best system performance. The simulation results show that the FLC is able to track the trajectory reference accurately for a range of values of orifice opening. Beyond that range, the orifice opening may introduce chattering, which the FLC alone is not sufficient to overcome. The PSO optimized FLC can reduce the chattering significantly. This result justifies the implementation of the proposed method in position control of EHAS. | Daniel M. Wonohadidjojo Ganesh Kothapalli Mohammed Y. Hassan | 2013 | International Journal of Automation and computing2013，10，3： | 17 |
| 2 | Interval Type-2 fuzzy position control of electro-hydraulic actuated robotic excavator显示文摘This paper deals with fuzzy intelligent position control of electro-hydraulic activated robotic excavator for the control of boom, arm and bucket axes. Intelligent control systems are required to overcome undesirable stick-slip motion, limit cycles and oscillations. Models of electro-hydraulic servo controlled front end loader excavators are highly nonlinear. The nonlinear model accounts for fluid flow rate of valve, pump hydraulics, and friction forces. The friction forces are modelled by Coulomb, viscous and Stribeck function. Interval Type-2 Fuzzy Logic Controller (IT2FLC) is used to study the time-domain position responses of axes in the presence of external applied load. It has the ability to control the position of each of the three axes with minimum actuator position errors. Models presented are accurate and study the dynamics of the actuator and load. To improve the transient behaviour of the robotic excavator, we eliminated jitter of the bucket movement in the presence of nonlinearities. | Hassan Mohammed Yousif Kothapalli Ganesh | 2012 | International Journal of Mining Science and Technology2012，22，3： | 2 |
| 3 | Stimulation of fibroblast cell growth, matrix production, and granulation tissue formation by connective tissue growth factor显示文摘 | Williams S Kothapalli D | 1996 | J Invest Dermatol1996，107，3： | 1 |
| 4 | Origin of changes in the epigastric impedance signal as determined by a three-dimensional model显示文摘 | Kothapalli B | 1992 | IEEE Trans BME1992，39，10： | 1 |
| 5 | Ex vivo blood vessel imaging using ultrasound-modulated optical microscopy 显示文摘 | KOTHAPALLI S WANG L H | 2009 | J Biomed Oot2009，14，1： | 1 |
| 6 | CTGF modulates cell cycle progression in cAMP-arrested NRK fibroblasts显示文摘 | Grotendorst GR | 2000 | J Cell Physiol2000，182，1： | 1 |
| 7 | Biomimetic regeneration of elastin matrix protein using hyaluronan and copper ion cues显示文摘 | Kothapalli C R Ramamurthi A | 2009 | Tissue Eng2009，15，1： | 1 |
| 8 | Lysyl oxidase enhances elastin synthesis and matrix formation by vascular smooth muscle cells显示文摘 | Chandrasekhar R Kothapalli R Anand R | 2009 | J Tissue Eng Regen Med2009，3，： | 1 |
| 9 | CTGF modulastes cell cycle progression in cAMP-arrested NRK fibro sis显示文摘 | Kothapalli D Grotendorst GR | 2000 | J Cell Physiol2000，182，1： | 1 |
| 10 | Spectral hole burning for ultrasound-modulated optical tomography of thick tissue 显示文摘 | XU X KOTHAPALLI S LIU H | 2010 | JBiomedOpt2010，15，6： | 1 |
| 11 | Stimulation of fibroblast cell growth, matrix production, and granulation tissue formation by con- nective tissue growth factor显示文摘 | Frazier K Williams S Kothapalli D | 1996 | J Investi Dermatol1996，107，3： | 1 |
| 12 | Influence of temperature and concentration on the sintering behavior and mechanical properties of hydroxyapatite 显示文摘 | Kothapalli C Wei M Vasiliev A | 2004 | Acta Materialia2004，52，19： | 1 |
| 13 | Biotinylation of K12 in histone I-I4 decreases in response to DNA double- strand breaks in human JAr choriocarcinoma cells 显示文摘 | KOTHAPALLI N SARATH G ZEMPLENI J | 2005 | Journal of Nutrition2005，135，10： | 1 |
| 14 | Inhibition of histone deacetylase activity attenuates renal fibroblast activation and interstitial fibrosis in obstructive nephropathy显示文摘 | Pang M Kothapally J Mao H | 2009 | Am J Physiol Renal Physiol2009，297，4： | 1 |
| 15 | CTGF modulates cell cycle progression in cAMP-arrested NRK fibroblasts显示文摘 | Kothapalli D Grotendorst GR | 2000 | J Cell Physiol2000，182，1： | 1 |
| 16 | CTGF modulates cell cycle progression in c AMP-arrested NRK fibroblasts显示文摘 | Kothapalli D Grotendorst GR | 2000 | J Cell Physiol2000，182，1： | 1 |
| 17 | Stimulation of fibroblast cell growth, matrix production, and granulation tissue formation by connective tissue growth factor 显示文摘 | Frazier K Williams S Kothapalli D | 1996 | J Invest Dermatol1996，107，3： | 1 |
| 18 | CTGF modulates cell cycle progression in cAMP-arrested NRK fibroblasts 显示文摘 | Kothapalli D Grotendorst G R | 2000 | J CellPhysiol2000，182，1： | 1 |
| 19 | Stimulation of fibroblast cell growth,matrix production,and granulation tissue formation by connective tissue growth factor显示文摘 | Frazier K Williams S Kothapalli D | 1996 | J Invest Dermatol1996，107，3： | 1 |
| 20 | Stimulation of fibroblast cell growth,matrix production,and granulation tissue formation by connective tissue growth factor显示文摘 | Frazier K Williams S Kothapalli D | 1996 | J Invest Dermatol1996，107，3： | 1 |
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