Faculty and Institute (คณะและสถาบัน)
http://repository.rmutp.ac.th/handle/123456789/12
Thu, 19 Oct 2017 16:23:40 GMT2017-10-19T16:23:40ZRegression model for prediction the thickness of parabolic part under uncertainty of sheet metal properties
http://repository.rmutp.ac.th/handle/123456789/2225
Regression model for prediction the thickness of parabolic part under uncertainty of sheet metal properties
Chalakorn, Udomraksasakul; Wiratchakul, Kotchakorn; Udomraksasakul, Chalida
This research aims to predict the thickness loss of parabolic forming by using hydromechanical deep drawing (HMD) process. The methodology used is the finite element method on the uncertainty of the mechanical properties for 1 mm thickness SPCC sheet metals. The properties consisted of three aspects: strength coefficient (K), strain hardening exponent (n-value), and plastic strain ratio for all three axis (r0, r45, and r90). Multiple simulations were completed by randomly selecting K, n, r0, r45, and r90 values following the distribution obtained from the uniaxial tensile test. The results would be analyzed by using the regression equation to create the equation to predict the thickness loss of the test pieces obtained from the formation process using the K, n, r0, r45, and r90 variables without the use of finite element method. This would results in a decrease in the simulation time. Based on 30 experiments of uniaxial tensile test, it shows that the sheet metal properties are normally distributed. After that, 60 cases of the five variables were randomly selected to simulate the formation by using the finite element method. Finally, the results obtained from the aforementioned simulation is analyzed and generated into a regression equation. From the comparison between the value predicted from the regression equation and the result obtained from the formation process, it can be seen that the regression equation can effectively predict the thickness loss when the five variables are under the same distribution properties. However, the efficiency will decrease when the values of the five variables are beyond the distribution properties obtained from the experiment. In addition, the uncertainty of mechanical properties of sheet metal in the simulation displays the chances of discovering test pieces with over 40% thickness loss. The simulation resulted in 5 damaged test pieces, accounting for 8.33% of the total process.
รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2559
Thu, 19 Oct 2017 00:00:00 GMThttp://repository.rmutp.ac.th/handle/123456789/22252017-10-19T00:00:00ZFusion of multispectral and panchromatic image using improved PCA mergers with discrete wavelet based algorithms
http://repository.rmutp.ac.th/handle/123456789/2224
Fusion of multispectral and panchromatic image using improved PCA mergers with discrete wavelet based algorithms
Phanthuna, Nattapong; Cheevasuwit, Fusak
The data fusion is implement to take the survey data remotely from difference sources and have various looks to be combined to get a new agent. To get better quality of data, we will present a method of fusion by wavelet transform with IHS Transformation method or PCA Transformation method. From the results showed that both IHS and PCA Transformation method able to be gotten high quality but the specifications of wave from damage is different.
รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2559
Thu, 19 Oct 2017 00:00:00 GMThttp://repository.rmutp.ac.th/handle/123456789/22242017-10-19T00:00:00ZA development of pineapple leaf cooking stove
http://repository.rmutp.ac.th/handle/123456789/2223
A development of pineapple leaf cooking stove
Sakesengkham, Ratchada
Recently, Baan Pasang Wiwat Pineapple Leaf Community Enterprise, Nanglae Sub-district, Muang District, Chiangrai, has used a spherical cooking stove made of stainless steel to cook pineapple leaves. The cooking capacity was 40-50 kilograms each time, and the cooking time was approximately 4 hours. The fuel was wood which was used for about 50 kilograms during the whole cooking process. The researcher has thought of saving the quantity of wood burned for coking by designing a new stove which would function like a charcoal kiln. It was a closed stove which would be automatically closed when the wood changed to charcoal to prevent the oxygen from entering. Then, the fire would be put out and only the charcoal remained. The experimental result was that the minimum quantity of wood could be used to cook 10 kilograms of pineapple leaves, and the process took 3.5 hours. However, it is still difficult to find wood for use as fuel because it is rare and expensive.
รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2558
Thu, 19 Oct 2017 00:00:00 GMThttp://repository.rmutp.ac.th/handle/123456789/22232017-10-19T00:00:00ZCommunity technology for development temperature reduction interlocking block product by pumice rock fragments
http://repository.rmutp.ac.th/handle/123456789/2222
Community technology for development temperature reduction interlocking block product by pumice rock fragments
Sanyawuth, Thanan; Khamput, Prachoom; Pradmali, Sajjachan
This research aims to study how to use stones Pumice Products is interlocking block for community development. The mixture ratios of Portland cement type1: sand: quarry dust: pumice rock fragments: water that there are 5 ratios. The products were tested by the community TCPS 602-2547 (2004) (Thai): interlocking block. The results showed that interlocking block of stone pumice much, a compressive strength and thermal conductivity under a block of stone pumice less. The water absorption is increased, When a block of stone pumice much. The optimum ratio and the use of waste rock Pumice highest ratio of cement to stonedust on the stone Pumice water in a 10: 6.4: 0.6: 0.45 to 10: 6.1: 0.9. 0.45 by weight.
รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2559
Thu, 19 Oct 2017 00:00:00 GMThttp://repository.rmutp.ac.th/handle/123456789/22222017-10-19T00:00:00Z