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The Qualification of the Additively Manufactured Parts in the Aviation Industry
Issue:
Volume 6, Issue 1, June 2019
Pages:
1-10
Received:
7 July 2019
Accepted:
27 July 2019
Published:
13 August 2019
Abstract: The aviation is a highly engineered industry. It has precise manufacturing requirements. Because of these requirements, the aviation has been forced to be a pioneer for implementation of novel manufacturing techniques such as Computer Aided Design (CAD), Computer Aided Manufacturing (CAM) and newly-developed materials such as carbon fiber composites. These technologies and materials were firstly adopted by the aviation industry. Many processes and materials were used by other sectors such as automotive, ship construction and white goods etc. after the aviation industry used those as regular ones. On the other hand, the aviation industry is a booming sector because it is leveraged by increasing passenger traffic. Passenger traffic projections show that the aviation industry will continuously expand. Naturally, this expansion will attract many companies into the aviation industry and therefore attraction will conclude a fiercer competition environment in the aviation industry. At the conclusion, the companies in the aviation industry will look for implementation of novel technologies since they will not want to fall behind their competitors. On the other hand, the airworthiness authorities always keep their decision and regulation maker position while the companies are the followers. It can be put forward that the most difficult side of the implementation of novel technologies into aviation industry is to get along with the strict rules and regulations which are put by international and national airworthiness authorities. In this context, the question of how to qualify the additively manufactured parts (AMPs) is waiting for the answer. The additive manufacturing (AM) is a strong process which has been implemented into aviation industry rapidly while the qualification and certification processes still have many challenges. This paper provides the pathway and the steps of qualification for additively manufactured parts (AMPs) besides the categorization of AM technologies and the impact of weight reduction over flight operation cost.
Abstract: The aviation is a highly engineered industry. It has precise manufacturing requirements. Because of these requirements, the aviation has been forced to be a pioneer for implementation of novel manufacturing techniques such as Computer Aided Design (CAD), Computer Aided Manufacturing (CAM) and newly-developed materials such as carbon fiber composite...
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Optimization of Turning Parameters to Minimize Burr by Using Taguchi Design Method
Yanfei Bian,
Meng Cai,
Shi Li,
Shuai Zhang,
Shengxuan Wu,
Lichao Tong
Issue:
Volume 6, Issue 1, June 2019
Pages:
11-16
Received:
9 July 2019
Accepted:
12 August 2019
Published:
2 September 2019
Abstract: Reducing burr formation in machining operations is of vital importance as they can decrease the functionality of components and can cause injuries. Nowadays, additional processes for deburring are often necessary. To avoid deburring, the modification of turning processes is a promising approach. Here, different parameters have a significant influence on burr formation. This paper presents the influence of cutting parameters like cutting speed, feed rate, depth of cut on the burr size of 5A06, 6061 and 6063 aluminum alloy during turning on CNC lathe. A plan of experiments based on Taguchi method has been used to acquire the data. An orthogonal array, signal to noise (S/N) ratio and analysis of variance (ANOVA) are employed to investigate machining characteristics using fine turning tool within the domain of experiments considered. Experimental runs were chosen following L9 orthogonal array of Taguchi. Analysis of variance was undertaken to find out the influence of process parameters on the response noted. Predicted values are finally checked for accuracy through a confirmation test. Confirmation tests have been carried out to predict the optimal setting of process parameters to validated the proposed method and obtained the values 0.024 mm, 0.006 mm, and 0.009 mm for burr height of 5A06, 6061 and 6063 aluminum alloy respectively. In this paper, methods for burr minimization in various cutting processes are presented. Burr reduction strategies for turning of different materials are presented.
Abstract: Reducing burr formation in machining operations is of vital importance as they can decrease the functionality of components and can cause injuries. Nowadays, additional processes for deburring are often necessary. To avoid deburring, the modification of turning processes is a promising approach. Here, different parameters have a significant influen...
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Modelling and Analysis About a Fault State of a New Cockpit Control Mechanism
Issue:
Volume 6, Issue 1, June 2019
Pages:
17-23
Received:
17 July 2019
Accepted:
19 August 2019
Published:
4 September 2019
Abstract: In the process of aircraft development, the assessment of handling quality is particularly step for verifying the cockpit control units design whether meets the design requirements or not. If the assess results are not met the design requirements, the design must to be optimized or even redesigned. At present, most of research is mainly related to the design of cockpit control units and simulating and assessment of their maneuverability based on the dynamic model in the normal mode, however, the research on handling quality of cockpit control units in the failure operating mode is seldom. Moreover, override rod linkage form as a new kind of cockpit control units brings plenty of profits such as the weight saved and maintainability improved, however, it causes the failure mode becomes diverse and complicated. Therefore it will increase the difficulty of assessing this kind of cockpit control units. The object of this paper is to do a research on working principle and physical characteristics of cockpit control units of override rod linkage form, through modeling and simulation on its normal operating mode and failure mode, and finally gives an analysis and evaluation for the column force quality of each failure mode. The simulation results reveal the column force quality of each failure mode is acceptable.
Abstract: In the process of aircraft development, the assessment of handling quality is particularly step for verifying the cockpit control units design whether meets the design requirements or not. If the assess results are not met the design requirements, the design must to be optimized or even redesigned. At present, most of research is mainly related to ...
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Features of the New Defect Indicator on the Gorbunov Effect
Issue:
Volume 6, Issue 1, June 2019
Pages:
24-26
Received:
21 July 2019
Accepted:
21 August 2019
Published:
4 September 2019
Abstract: It's been 20 years since the opening of the new phenomenon of ultrasonic treatment on defects in the metal, which ingibiruetsa Doppler radar. The former results from the application of radar to monitor defects limited to surface discontinuities under the paint layer, other dielectric coatings. A new direction of remote detection of metal defects (cracks, metal stratification at a depth of several tens of centimeters) by Doppler radar of 30-40GHz frequency is now possible. Developed, tested sensor contactless indexing of acts of acoustic emission. A device for indicating defects that could previously be detected only by contact sensors based on piezoelectrics was tested. The paper deals with the causes of previous failures, low sensitivity of radars with their direct p. the possibilities of increasing the sensitivity due to the joint use of ultrasound and microwave radiation are Shown. The obtained results require a revision of the capabilities of the known ultrasonic flaw detectors of active and passive principle of action.
Abstract: It's been 20 years since the opening of the new phenomenon of ultrasonic treatment on defects in the metal, which ingibiruetsa Doppler radar. The former results from the application of radar to monitor defects limited to surface discontinuities under the paint layer, other dielectric coatings. A new direction of remote detection of metal defects (c...
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Investigation of Wind Energy Resource on the Basis of Weibull and Rayleigh Models in North Eastern and Western, Nigeria
Abdullahi Ahmed,
Bashir Isyaku Kunya
Issue:
Volume 6, Issue 1, June 2019
Pages:
27-32
Received:
31 July 2019
Accepted:
28 August 2019
Published:
16 September 2019
Abstract: This study is aimed to investigate wind energy resource on the basis of Weibull and Rayleigh models in north eastern (Bauchi and Maiduguri) and western (Kano and Sokoto) Nigeria, seventeen years (2000-2016) monthly wind speed data were collected from Nigeria meteorological station, Abuja at 10m height. The probability distribution function (pdf) of wind speed is very important tool needed in wind energy resource investigation, since wind power is proportional to the cube of wind speed. The Weibull parameters shape (k) and scale (c) for the four locations were determined and the values obtained for shape factors in Bauchi and Maiduguri range from 6.91 to 7.21 and Sokoto and Kano range from 9.27 to 10.68, while scale factors is in the range of 3.46 to 7.24 and 9.32 to 11.24, respectively. The Weibull model was found to be better fit than the Rayleigh model in analyzing the wind speed data. The north western part of Nigeria was found to have higher wind power density as compared to the north eastern part of the country.
Abstract: This study is aimed to investigate wind energy resource on the basis of Weibull and Rayleigh models in north eastern (Bauchi and Maiduguri) and western (Kano and Sokoto) Nigeria, seventeen years (2000-2016) monthly wind speed data were collected from Nigeria meteorological station, Abuja at 10m height. The probability distribution function (pdf) of...
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