http://repository.rmutp.ac.th/handle/123456789/83 2026-04-04T15:18:17Z 2026-04-04T15:18:17Z Ruksnit, Sira ศิระ รักสนิท Kongsang, Rittiras ฤทธิราช กองแสง http://repository.rmutp.ac.th/handle/123456789/4121 2023-07-31T04:11:47Z 2023-05-31T00:00:00Z

115kV Circuit breaker analysis for maintenance plan Ruksnit, Sira; ศิระ รักสนิท; Kongsang, Rittiras; ฤทธิราช กองแสง HV power distribution system circuit breaker are important devices in substations. Such as Malfunction or deterioration of equipment with in the substation, will directing impact on the stability of the power distribution system and affect the reliability of the system. In addition, this means that it is necessary to assess the actual condition of the proper condition-based operation and maintenance. Thus, this thesis presents condition assessment procedure for equipment by using technical information visual inspection by Weighted Scoring Method. Weighting technique is used to determine important weight testing methods of devices by using Analytic Hierarchy Process (AHP). Testing methods for circuit breaker are such as visual inspection, contact timing test. Scoring technique is divided into 1-3 levels by classifying on actual evaluate equipment consisting of consisting of good, moderate, bad. This thesis proposes a software development in order to organize the database and calculate the analysis of the condition of equipment in 5 HV substations. The evaluation results will be divided into 3 levels good, medium and bad condition. According to the evaluation level, the maintenance types are separated into 1) regular maintenance 2) increase the frequency of maintenance and monitoring of the test 3) equipment must be improved urgently. Finally, abnormal incidents of equipment and cost of HV equipment maintenance can be reduced in effective way. วิทยานิพนธ์ (วศ.บ.) -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2564

2023-05-31T00:00:00Z Puangnak, Korn กร พวงนาค http://repository.rmutp.ac.th/handle/123456789/4041 2023-04-02T00:59:02Z 2023-04-02T00:00:00Z

The Collection of road traffic incidents in Bangkok from twitter data based on deep learning algorithm Puangnak, Korn; กร พวงนาค The surveillance and reports on accidents for the current traffic management are carried out by viewing and inspecting CCTV footage. This method is slow to detect incidents and requires a lot of manpower. Since nowadays communication technology and social media play a role in reporting such incidents, this research has been conducted to investigate accidents of interest from text messages reported on social media in Thai. There is currently no research or platform that supports this type of work clearly. This research presented the development of a neuron network memory-learning model to solve the problem of incidence pattern classification and incidence severity identification from social media messages in Thai. Using deep learning models, such as MLP, CNN, Bi-LSTM, and LSTM+CNN, the study was designed and divided into three experimental patterns. This included examining patterns to identify traffic incidents that may be reported as general news or traffic reporting; examining patterns to indicate the type of incidents, such as traffic accidents, disasters, damaged roads, or others other than those mentioned; and examining patterns to specify the severity levels of the incidents, such as normal, intermediate, traffic lane blocking, or immovable. The experiments demonstrated the capability of CNN+LSTM learning models with the best incidence detection result at 93.44 %. The CNN model gave the best result in identifying a pattern of incidence at 85.29 %, and the LSTM model was best able to determine the severity levels of the incidence at 88.53 %. ดุษฎีนิพนธ์ (วศ.ด.) -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2565

2023-04-02T00:00:00Z Meesanu, Nuttapong ณัฐพงศ์ มีสานุ http://repository.rmutp.ac.th/handle/123456789/3992 2023-03-10T20:20:20Z 2023-03-10T00:00:00Z

Study of parameters for forming hexagonal bulletproof ceramic armor plate Meesanu, Nuttapong; ณัฐพงศ์ มีสานุ This research had two objectives that were to study parameters for forming bulletproof ceramic armor plates and to create a model of a bulletproof ceramic armor plate for small armored regular trucks. The parameters used to form a ceramic armor plate contain the thickness of the armor plate and the compressive strength, which affects the density distribution of the green compact. A ballistic ceramic armor plate with a hexagonal shaped material was created as a concave bulletproof plate. Extrusion results displayed that the hexagonal material was formed at a very high density on the side surface of the armor plate but with uneven capacity distributed across the overall plate, due to the friction occurring on the wall of the mold. The finite element method, particularly at the Ansys/Explicit Dynamic tools were applied to analyse the damage of bulletproof plates. The model of a concave-shaped bulletproof plate was set for the SKD11material, influencing the changes in the direction of the bullet firing when the bullet hit the bulletproof plate at a velocity of 880 m/s in accordance with the NIJ 4 standard. The bullet was made of tungsten carbide and the ceramic armor plate was built with a size of 300×300 mm and thicknesses of 14, 16, 18, and 20 mm. The bullet was fired into the center part and onto the curved surface of the ceramic plate. The result shows that the armor plate could not resistant to penetration. In this situation, the direction of the bullet's movement against the armor plate especially at a curved surface as a slope could result the deflection of the bullet direction as well as reduction of penetration capability. วิทยานิพนธ์ (วศ.ม.) -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2564

2023-03-10T00:00:00Z Khramum, Visa วิสา คร้ามอ่ำ http://repository.rmutp.ac.th/handle/123456789/3991 2023-03-10T20:18:17Z 2023-03-10T00:00:00Z

Steel armor plates Khramum, Visa; วิสา คร้ามอ่ำ This research project aimed to analyze and design the pattern of a bulletproof metal armor plate as well as build a bulletproof metal armor plate for a small armored regular truck. The methodology consisted of the NIJ standard test and the finite element analysis. The bulletproof plates created were tested for a real firing. Their firing results were compared with those of NIJ-standard using a finite element program, in this case applying with the program Ansys/Explicit Dynamic. SolidWorks program is employed as a tool to design and create 3D models of armor plates and bullets. The materials taken in the finite element simulation were SKD11 and SUS304 and the parameters utilized in the research were material types, hardness values, spacing between the plates and thickness. In the case of two armor plates stacked, SKD11 material was designed for the first armor plate to be hit by the bullet. It served to destroy bullets. In addition, the second armor plate made of SUS304 material served to absorb energy and obstruct the movement of bullets. For testing, a 30-06 caliber M2 AP 166 Gr bullet was selected at a 0-degree angle and the velocities measured and set by the Ansys/Explicit Dynamic program were 901.7 m/s and 880 m/s, respectively. The front plate made of SKD11 material with a thickness of 10 mm and the back plate made of SUS304 material with a thickness of 10 mm were fired 1 shot. The results showed that the bullet could penetrate the front armor plate but not penetrate the back-armor plate. In the NIJ 3 standard tests, the shooting with a 7.62x51 mm NATO FMJ 148 Gr shell at a 0-degree angle for 5 times with velocities equal to 846.4, 841.3, 839.1 838.2 and 845.3 m/s was performed on the stacking front and back armor plates, both made of SUS304 material with a thickness of 8 mm. The bullet velocity simulated by the Ansys program was 847 m/s, resulting in the front plate having a bullet penetration and a slight bulge on the back plate. From the finite element simulation results and the actual test results, it was found that the damage to the armor plates detected by both methods was consistent. Therefore, the finite element program was selected to simulate the damage of armor plates resistant to penetration according to the NIJ standard Level 4. The results of the research could be concluded that the use of armor plates stacked with suitable different materials in multiple layers would affect the penetration resistance. Increased thickness and optimal spacing between the armor plates were important parameters in penetration resistance. Moreover, it revealed that the higher the material hardness, the better its ability to resist penetration. In particular, this suggestion should be applied to the first armor plate or front armor plate. วิทยานิพนธ์ (วศ.ม.) -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2564

2023-03-10T00:00:00Z