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Experimental investigation and optimization of laser induced plasma micromachining using flowing water
摘要： In this study, laser induced plasma micromachining using flowing water (F-LIPMM) was performed to create micro-channels on stainless steel surface. The effects of process parameters (water speed, laser pulse energy, frequency and scanning speed) on the responses of micro-channel width, depth, material removal rate (MRR) and heat affected zone (HAZ) were investigated based on response surface methodology (RSM). The regression models for the machined width, depth, MRR and HAZ were developed, and the adequacies of the developed models were subsequently verified by analysis of variance (ANOVA) method. Finally, grid structures consisting of desired micro-channels were created with the optimum process parameters: water speed of 8 m/s, pulse energy of 10.4 μJ, frequency of 15.8 kHz and scanning speed of 2.7 mm/s. The uniform micro-channels with smooth bottoms, side-walls and small HAZ were obtained, and the results showed that the predicted responses using the developed models were comparable with the experimental results.
关键词： Laser induced plasma micromachining,RSM,Micro-channels,Flowing water
更新于2025-09-16 10:30:52
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Micromachining on Al-Sic Based Metal Matrix Composite Using DPSS Laser
摘要： Aluminum silicon carbide is a metal matrix composite largely used where strength to weight ratio and high thermal conductivity is primary in design criteria. It has wide application in Aerospace components, Automobiles & electronics industries. Present work deals in micro-grooving of this hard to machine material is carried out by diode pumped solid state pulsed Nd:YAG Laser. The experimental plan is carried out by CCD (central composite design) based on RSM (response surface methodology).Also the analysis of variance test is carried out to check the adequacy of the fitted regression mathematical models. Proper ranges of process parameters such as pulse width, pulse frequency, amount of current, assist air pressure were purposed. Screening test shows O2 as assist gas when used 0.2 to 1 kgf/cm2 pressure range gives best result because of its advantage during laser material interaction. The responses are taken as upper width deviation, lower width & depth deviation of micro-groove produced on Al-SiC material. The interaction effects of different parameters on responses are analyzed through surface plots generated. Optimal process parametric conditions are found out by utilizing meta-heuristic based search algorithm MOPSO (multi objective particle swamp optimization) technique.
关键词： MMC,ANOVA,Nd:YAG,RSM,SEM
更新于2025-09-12 10:27:22
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Free Space Optical Communication (System Design, Modeling, Characterization and Dealing with Turbulence) || 5. Low power and compact RSM and neural-controller design for beam wandering mitigation with a horizontal-path propagating Gaussian-beam wave: focused beam case
摘要： Beam wander on the detector plane is one of the main causes of major power loss which severely degrades the performance of Free Space Optical (FSO) links. Confronted with this big problem, designing a suitable controller to compensate beam wandering at a fast rate so as to increase beam stability becomes significant. This chapter presents an investigation of the performance of two types of controller designed for increasing the stability of the beam on the detector plane under dynamic disturbances. The first design is based on Taguchi’s method: Response Surface Model (RSM) controller while the second is the Artificial Neural Network (ANN) method (neural-controller). These controllers process the beam spot information and generate the necessary outputs to mitigate beam wandering, so as to perfectly couple the Power In the Bucket (PIB): receiver aperture, into the detector. Pipelined-parallel architecture for both controllers are proposed and developed in a Field Programmable Gate Array (FPGA). The implementation of these two candidate controllers is described in detail as installed at the receiver station. Evidence of the suitability and the effectiveness of the proposed controllers in terms of prediction exactness, prediction error, reduction of beam wander, response to impulse and effective scintillation index are provided through experimental results from the FSO link established for the horizontal range of 0.5 km at an altitude of 15.25 m.
关键词： Artificial Neural Network (ANN),Field Programmable Gate Array (FPGA),beam wander,Free Space Optical (FSO) links,Response Surface Model (RSM)
更新于2025-09-12 10:27:22
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Experimental investigation and modeling of heat affected zone and surface roughness in erbium-doped fiber laser cutting of CFRP composite
摘要： In the current era, two types of the composite, namely polymer-based composites and metal matrix composite materials are used in the industrial application, and the demand for an increase in its production is rapidly growing. But these composite materials are not so widely acceptable in the industries due to its non-machinability nature by conventional methods. Various reasons like the incorporation of defects, high strength, and hardness of the composite make the production of intricate shapes not easily achievable by traditional methods which lead to the development of new non-conventional machining methods. Laser machining method is one of the non-conventional methods which are becoming popular for cutting of composite materials due to its advantages of fast cutting speed and no contact with the workpiece. In this experimental work, an erbium-doped fiber laser is used to study the machinability of carbon fiber reinforced polymer composite and effect of various machining parameters are observed on the performance responses like heat affected zone and surface roughness. It was found that composite was easily machinable with some surface defects which were detected by SEM images. The decrease in power with an increase in scan speed and standoff distance reduces surface roughness and heat affected zone in the material.
关键词： Fiber Laser,CFRP composite,HAZ,RSM,Surface roughness
更新于2025-09-11 14:15:04
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Optimization of Pulsed Nd:YVO4 Through Transmission Laser Welding of Transparent Acrylic and Polycarbonate
摘要： In the present work through transmission laser welding (TTLW) of two transparent plastic materials namely, Acrylic and Polycarbonate at varied levels of laser power, scanning speed and frequency have been carried out to form lap joints without application of filler material. The effect of input parameters on the weld quality has been studied through inspection and tests. Statistical software Design Expert 10 has been applied for design of experiments and analysis purpose. Breaking load and weld width have been considered as responses. Response surface methodology (RSM) has been applied for multi-objective optimization for minimization of weld width and maximization of breaking load simultaneously. Confirmatory tests have been conducted to validate the applied optimization techniques.
关键词： Design Expert 10,Multi-objective optimization,RSM,TTLW,Acrylic and Polycarbonate
更新于2025-09-11 14:15:04
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A Parametric Study of Kerf Deviation in Fiber Laser Micro Cutting on Ti6Al4V Superalloy
摘要： A distinctive scope in the fabrication of desired products with specific standard has been achieved by the recent advancement in the technology. This available developing technology is able to produce production of various components, structures, shapes etc made of different kind of materials with necessary dimensional and geometrical features. But it is extremely difficult for 50 Watt average power machine to achieve good quality cutting of the metal sheet upto 2 mm thickness. A unique parameter sawing angle acts as a significant use in kerf deviation in cutting titanium alloy sheet (Ti6Al4V) of 1 mm thickness in low power fiber laser beam machining. The present field of study deals with the effect of sawing angle with other process parameters like cutting speed, power setting, duty cycle, and pulse frequency for a titanium alloy metal sheet to reduce kerf deviation where experiments are carried out on the basis of central composite design (CCD) technique of RSM.
关键词： Kerf deviation,Sawing angle,Titanium alloy Ti6Al4V,RSM
更新于2025-09-11 14:15:04
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Optimization, kinetics and thermodynamics of photocatalytic degradation of Acid Red 1 by Sm-doped CdS under visible light
摘要： Sm-doped CdS nanoparticles were synthesized through an ultrasound-assisted co-precipitation method and their photocatalytic efficiency was investigated by applying them to photodegradation of Acid Red 1 (AR1) under visible light. The effect of the operational factors on the photocatalytic process was systematically evaluated using response surface methodology. Under the optimal conditions ([AR1]0= 15 mg L-1, [2% Sm-CdS]0= 1 g L-1, pH= 4 and t= 94 min), more than 83% of the AR1 molecules were degraded. The kinetics of the process was well described by the Langmuir-Hinshelwood’s pseudo-first-order model (kapp= 0.0163 min-1). Furthermore, thermodynamics of the process was demonstrated by the activated complex theory of Eyring, which declared that the photocatalytic process is endothermic and nonspontaneous in the temperature range of 25–45°C. In addition, the main products and intermediates of AR1 degradation were determined by the GC-MS technique.
关键词： Sm-doped CdS,Thermodynamics,Visible light photocatalysis,Kinetics,Acid Red 1,RSM
更新于2025-09-09 09:28:46
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Investigation of hole quality in rotary ultrasonic drilling of borosilicate glass using RSM
摘要： The present article emphasizes on reducing the edge chipping and taper during rotary ultrasonic drilling of one of the most demanded ceramic glasses “BK-7.” Statistical tools of design of experiments and backing plate were adopted as two distinct approaches to curb the chipping damage. Central composite design has been conjugated with desirability function for framing the design matrix. This investigation also emphasizes to study the effect of process variables—spindle speed, ultrasonic power and feed rate—on the chipping width (CW) and taper (T). After developing the second-order regression models for the CW and T, analysis of variance was used to check the fitness of regression models and recognizing the significant model terms. Then impact of each process parameter was analyzed on responses of interest through 3-D surface plots. The feed rate came forth as the most dominating factor by having maximum influence over the qualitative aspects “CW” and “T” of the drilling process. Interactions of higher rpm and power with lower feed effectively reduced the CW and T. The backing material, employed during main experimentation, also proved its effectiveness to reduce CW when main experiments results were compared to the results of pilot experimentation, which was performed without backing plate. Scanning electron microscope (SEM) was used to analyze the different tool wear modes and microstructure of machined surfaces. Tool weight measurement revealed the dominance of bond fracture and grain fracture during the early stage of the drilling process. Apart from brittle fracture, SEM also affirmed the presence of plastically deformed regions over the machined surfaces. Little deviations between the predicted values and experimental values during the confirmatory tests validated the prediction accuracy of regression models at 95% confidence level.
关键词： Ultrasonic,Wear,Taper,Drilling,Optimization,RSM,Chipping,Desirability
更新于2025-09-04 15:30:14
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Effect of substrate thickness on coating roughness Ti/AlTiN during interaction process Parameter
摘要： Ti/TiAlN coatings were deposited on tungsten carbide substrates and consist of the target Ti0.5Al0.5 using sputtering system is one of the main techniques which done be coating substrate. This research aimed is to develop the model a PVD magnetron sputtering process that can predict the relationship between process input parameters and the resulting coating properties and performance. RSM Response Surface Methodology was used, one of the most cost-effective and practical techniques to develop the process model. The influence of substrate thickness on the structural properties of the coatings was investigated and the effect of bias voltage on the microstructure was investigated. The number of crystallite grain size reduced with the increase of the bias voltage then reduce minimum roughness 0.07157 (μm) and became maximum roughness 0.7856 (μm). The crystalline grain size of the coatings increased as the bias voltage was raised from 50 to 75 V, and then decreased with further increase of the bias voltage.
关键词： interaction,PVD,Sputtering,surface roughness,RSM
更新于2025-09-04 15:30:14