Srinakharinwirot University Engineering Journal

A Study of Awareness on Law Related to Pile Driving Work in the Construction of Track Doubling Project at Lop Buri - Pak Nam Pho section

Titawat Jongkaijuk — 2024-11-21

The objective of this research is to study the awareness of laws related to pile driving work in the dual-track railway construction project between Lopburi and Pak Nam Pho. Using a quantitative research methodology, data was collected through questionnaires. The study's target population is personnel involved in the project, divided into two groups as follows: Group 1: Construction supervision engineers who manage the on-site construction of the contractor's company. Group 2: Project engineers and project supervision engineers (specialists in pile driving work). The data collected relates to the awareness of laws concerning pile driving work and the engineering methods used for pile driving in the dual-track railway construction project. Additionally, opinions on variables affecting the project's success, both independent and dependent, were surveyed to interpret the research findings. The research findings revealed the following: 1) Awareness of Laws Related to Pile Driving Work in the dual-track railway construction project between Lopburi and Pak Nam Pho had an average score of 3.60, with a standard deviation of 0.94, indicating a high level of awareness overall. 2) Awareness of Pile Driving Construction Methods According to Engineering Principles, the same project had an average score of 3.67 with a standard deviation of 0.92, also indicating a high level of awareness overall.

Open-Source Embedded Vision System for Industry 4.0 Applications

Tanayos Arisariyawong — 2024-12-11

Vision systems are an important part of modern manufacturing processes in the Industry 4.0 era, using images from cameras to inspect and sort workpieces. However, it was found that vision systems have high costs in terms of both hardware and software, making it difficult for small and medium-sized factories to access this technology. Therefore, this research presents a low-cost, open-source embedded vision system that can communicate with industrial controllers. It is a combination of a PIXY 2 camera module, a ready-made camera module that uses artificial intelligence to detect colors and images, with an open-source embedded Arduino. Arduino will receive data from the PIXY 2 camera module and convert it into a communication format according to the Modbus protocol. In the experiment, the developed open embedded vision system will be connected to a PLC controller and a touch screen display to test the efficiency of detecting and sorting workpieces with different colors under different distances from the camera module and lighting conditions. From the experimental results, it was found that the longest distance from the camera module to the workpiece that can detect and sort the color of the workpiece correctly, both when the light on the camera module is off and on, was 80 millimeters. As for the connection to a PLC controller and a touch screen display, it was found that data can be transmitted and received correctly every time. It can also detect and sort the color of the workpiece immediately without any delay time.

Study of Performance of Small Engine Running Continuously Compared to TIS 787-2551 Standards

Sompot Khomkaew — 2024-12-09

This research aims to study and compare the performance of a small 4-stroke diesel engine with a newly designed single-cylinder engine with a maximum power of 8.5 kW compared to the TIS.787-2551 continuous operation type. The engine, utilizes B7 diesel fuel and SAE 30-40 lubricating oil. The air filter type is wet and the engine has one piston with a bore of 92 mm, a stroke of 96 mm, and a total displacement volume of 638 cm³. The compression ratio is 19.4:1, and the cooling system is a honeycomb water jacket with a cooling water capacity of 2.09 m³. The engine is designed to operate continuously for 10 hours with an injection pressure of 125 kg/cm². The intake valve clearance is set at 0.18 mm before top dead center (BTDC) on the opening side and 16.51 degrees BTDC on the closing side. The exhaust valve clearance is set at 0.15 mm before BTDC on the opening side and 50.71 degrees BTDC on the closing side. The testing is conducted under atmospheric pressure conditions starting at 760 mmHg, with a humidity level of 64% at the beginning and 78% after the test. The exhaust smoke color must not exceed 30% according to the Bosch exhaust gas measuring system. The lubricating oil temperature must not exceed 120°C, and the noise level must not exceed 100 dB. After testing, it was found that the tested small engine produced a maximum output power of 7.9 kW, a maximum torque of 31.3 N.m at 2400 rpm, with a fuel consumption rate of 284 g/kWh and exhaust smoke color of 7.2%, reaching a maximum noise level of 93.4 dB.

Study of the Performance of Small-Sized Engines Operating under Overloaded Conditions Compared to TIS 787-2551

Sompot Khomkaew — 2024-12-09

This research aims to study and compare the performance of a small 4-stroke diesel engine with a small single-cylinder horizontal 180-degree crankshaft diesel engine with a maximum power of 8.5 kW compared to TIS 787-2551, operating at maximum power and speed control using SAE 30-40 lubricating oil, wet air filter type, with a single piston with a bore diameter of 92 mm, stroke length of 96 mm, total displacement volume of 638 cm³, compression ratio of 19.4:1, and a water-cooling system with a coolant capacity of 2.09 m³, designed for continuous operation for 10 hrs. Injection pressure of 125 kg/cm², with a pre-top dead center (TDC) opening position of 16.51 degrees and post-bottom dead center (BDC) closing position of 35.38 degrees for the intake valve, and a pre-BDC opening position of 50.71 degrees and post-TDC closing position of 20.34 degrees for the exhaust valve. Tested under initial atmospheric pressure of 761 mmHg, post-test atmospheric pressure of 760 mmHg, relative humidity at the start of testing at 51%, increasing to 78% after testing. Smoke emissions must not exceed 30% of the Bosch smoke meter, lubricating oil temperature must not exceed 120ºC, and noise levels must not exceed 100 dBs after testing. It was found that the tested small engine produced a maximum output power of 7.6 kW at 2,405 rpm, maximum torque of 33.8 N.m at 1,812 rpm, fuel consumption rate of 304 g/kWh at 2,405 rpm, smoke emissions of 5.9% at 2,450 rpm, and a maximum noise level of 93.6 dBs at 2,405 rpm.