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RISS 인기검색어
- 검색키워드
- 저자 : Vinutha Manjunath (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Vibration Control of A Thin Walled Composite Beam Using PID Control Technique
T.C. Manjunath,IIT Bombay,Sheelarani T B,C B Vinutha,M Z Kurien 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper features the modeling and design of a PID controller to control the vibrations of a smart thin walled composite box beam. Collocated piezoelectric patches are bonded as sensor / actuator to the master structure at a certain finite element location on the beam, i.e., nearby the fixed end of the composite box beam. The beam structure is modeled in the state space form using the concept of piezoelectric theory, the Timoshenko beam theory and the Finite Element Method. The beam is subjected to an external disturbance (say, impulse or sine or random excitation). A novel PID controller is designed for the smart composite box beam. When the designed controller is put in the loop with the plant, i.e., the smart structure plant, the plant performs well and the vibrations are damped out in a quicker time. The performance of the designed controller is thus evaluated for vibration control and the conclusions are here by drawn. The simulation results show the effectiveness of the developed method. This is the main objective of this paper.
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T.C.Manjunath,IITBombay,Sheelarani TB,CB Vinutha,MZ Kurien 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A novel chebyshev filter is designed in this paper and is used for reduction of the noises in the captured input signals which is further used for processing in the smart systems architecture,i.e., in the active vibration control of smart structures. This is the main objective of this paper.
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Best location for placement of collocated sensor / actuator pair on smart systems
T.C. Manjunath,IIT Bombay,Sheelarani T B,C B Vinutha,M Z Kurien 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Active vibration control is an important problem in structures. One of the ways to tackle this problem is to make the structure smart & intelligent by making use of certain materials called as smart materials (piezoelectrics, shape memory alloys, electrorheological fluids, PVDF, etc.). This paper features the mathematical modeling of a single input single output based Euler-Bernoulli smart beam & the usage of this mathematical model to suppress the active vibrations in it using 2 types of control laws, viz., the periodic output feedback control law & the fast output sampling feedback control law. The active vibration control concept along with the best location for the placement of the sensor / actuator pair on the smart systems is compared herewith & the conclusions are drawn. This is the main objective of this paper.
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Paras Mull Gehlot,Vinutha Manjunath,Mysore Krishnaswamy Manjunath 대한치과보존학회 2016 Restorative Dentistry & Endodontics Vol.41 No.1
Objectives: The purpose of this in vitro study was to evaluate the accuracy of working length (WL) determination of four electronic apex locators (EALs), namely, Root ZX (RZX), Elements diagnostic unit and apex locator (ELE), SybronEndo Mini Apex locator (MINI) and Propex pixi (PIXI) using Stainless steel (SS) and nickel-titanium (NiTi) hand files. The null hypothesis was that there was no difference between canal length determination by SS and NiTi files of 4 EALs. Materials and Methods: Sixty extracted, single rooted human teeth were decoronated and the canal orifice flared. The actual length (AL) was assessed visually, and the teeth were embedded in an alginate model. The electronic length (EL) measurements were recorded with all four EALs using SS and NiTi files at ‘0.5’ reading on display. The differences between the AL and EL were compared. Results: The results obtained with each EAL with SS and NiTi files were compared with AL. A paired sample t test showed that there was a statistical significant difference between EAL readings with SS and NiTi files for RZX and MINI (p < 0.05). The accuracy of RZX, ELE, MINI and PIXI within ± 0.5 mm of AL with SS/ NiTi files were 93.3%/70%, 90%/91.7%, 95%/68.3%, and 83.3%/83.3%, respectively. Conclusions: The results of this study indicate that Root ZX was statistically more accurate with NiTi files compared to SS files, while MINI was statistically more accurate with SS files compared to NiTi files. ELE and PIXI were not affected by the alloy type of the file used to determine WL.
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Gehlot, Paras Mull,Manjunath, Vinutha,Manjunath, Mysore Krishnaswamy The Korean Academy of Conservative Dentistry 2016 Restorative Dentistry & Endodontics Vol.41 No.1
Objectives: The purpose of this in vitro study was to evaluate the accuracy of working length (WL) determination of four electronic apex locators (EALs), namely, Root ZX (RZX), Elements diagnostic unit and apex locator (ELE), SybronEndo Mini Apex locator (MINI) and Propex pixi (PIXI) using Stainless steel (SS) and nickel-titanium (NiTi) hand files. The null hypothesis was that there was no difference between canal length determination by SS and NiTi files of 4 EALs. Materials and Methods: Sixty extracted, single rooted human teeth were decoronated and the canal orifice flared. The actual length (AL) was assessed visually, and the teeth were embedded in an alginate model. The electronic length (EL) measurements were recorded with all four EALs using SS and NiTi files at '0.5' reading on display. The differences between the AL and EL were compared. Results: The results obtained with each EAL with SS and NiTi files were compared with AL. A paired sample t test showed that there was a statistical significant difference between EAL readings with SS and NiTi files for RZX and MINI (p < 0.05). The accuracy of RZX, ELE, MINI and PIXI within ${\pm}0.5 mm$ of AL with SS/NiTi files were 93.3%/70%, 90%/91.7%, 95%/68.3%, and 83.3%/83.3%, respectively. Conclusions: The results of this study indicate that Root ZX was statistically more accurate with NiTi files compared to SS files, while MINI was statistically more accurate with SS files compared to NiTi files. ELE and PIXI were not affected by the alloy type of the file used to determine WL.
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