This study applied a dual-optical-fiber real-time measurement system to precision surface grinding of FC-300 gray cast iron, focusing on internal strain and temperature variations. The system uses attached and free fibers to measure force- and heat-induced strains, respectively, with decoupling achieved through wavelength shift theory. In 14 grinding trials, the maximum temperature-induced strain reached 500 με for workpiece A-2 and 1200 με for workpiece B-2, while force-induced compressive stra...

The article uses a thermodynamic investigation of the steam reforming of methanol (SRM) using either urea water solution (UWS) or pure water. This process examines hydrogen-rich gas production, hydrogen yield, and carbon creation. The SRM with UWS produces a higher hydrogen-rich gas and achieves greater reforming efficiency than SRM without UWS. With a water-to-methanol ratio of 5 at 700 °C using UWS, the maximum hydrogen yield reaches 4.4 mole/mole MeOH, resulting in the highest reforming effic...

In this study, silica aerogel and short carbon fiber are added as reinforcements into NC826 epoxy resin to provide nano-macromolecular composite materials. The materials are subject to static compression and dynamic impact tests under various strain rates using a universal testing machine and Hopkinson bar. Field emission scanning electronic microscopy (FE SEM) is then used to obtain fractography to explore the mechanism of interfacial fracture and the dispersion of the reinforcements. In the s...

The automated precision surface finishing processes are the demanding technologies to be developed, to improve some drawbacks of manual polishing. The objective of this study is to develop robot assisted constant force polishing of STAVAX mold steel using lab-made polishing tools mounted on a new polishing end effector. A new polishing end effector embedded with a force sensor has been designed and fabricated, so constant force polishing was possible on a 6-axis industrial robot. The Taguchi met...

Ocean salinity varies from 33 to 37 g/L due to local geographic and climatic variations affecting ionic concentration, conductivity, microbial activity, and electron transfer rates. The impact of these natural salinity fluctuations on the performance of MFC remains underexplored. Hence, the present study investigates the influence of three salinity levels—lower (33 g/L, R33), optimum (35 g/L, R35), and higher (38 g/L, R38)—on power generation, bacterial viability, and biofilm formation in MFCs. ...

Pressure vessels are vital across many industries for containing fluids under high pressures and temperatures. Their design, fabrication, and maintenance require strict standards for safety and reliability, with welding playing a crucial role. Extensive research has optimized welding practices, enhancing weld quality and mechanical properties. Studies have explored the impact of welding parameters and filler materials on performance. For example, research on materials like stainless steel and In...

This paper introduces a direct-acting centrifugal speed limiter (DCSL) to address large braking errors and low sensitivity in ratchet-claw centrifugal speed limiters. A triggering model for the DCSL is established through dynamic analysis and simulated in MATLAB, revealing relationships between release speed, centrifugal block mass, speed regulating spring (SRS) stiffness, and SRS pre-compression. The DCSL mathematical model is derived and validated via ADAMS dynamic simulation. An experimental ...

The vibrational stimuli, particularly when it approximates the resonant frequency of human spine, can subject the spine to significant forces, heightening the risks of damage and potentially causing devastating consequences. Although numerous biomechanical inquiries have delved into the resonant frequency and its corresponding mode shape of the human lumbar spine, the majority overlooked the influence of physiological compressive loading stemming from muscular contractions. Consequently, this re...

In many engineering applications, compressed air without any moisture is critical. Heat regeneration-based adsorption dryers are commonly used to achieve ultra-low dew points in compressed air. This study experimentally examines the essential characteristics of three heat regeneration modes: internal heating, external heating, and compressor air heating. The calculations for the adsorption dryers are based on previous work, forming the foundation for a logical system comparison. The assessment i...

Gears are an indispensable element of industri-al equipment and power transmission in a wide range of manufacturing machinery. When faults occur on one or more gear teeth, the performance of the gear train deteriorates and the efficiency decreases. Vibration signal processing and analysis is one of the best preferred means to diagnose the planetary gear-box fault, but Vibration signal of gears is often submerged in a large amount of noise, leading to the decrease of fault diagnosis accuracy. In ...

Gears are an indispensable element of industri-al equipment and power transmission in a wide range of manufacturing machinery. When faults occur on one or more gear teeth, the performance of the gear train deteriorates and the efficiency decreases. Vibration signal processing and analysis is one of the best preferred means to diagnose the planetary gear-box fault, but Vibration signal of gears is often submerged in a large amount of noise, leading to the decrease of fault diagnosis accuracy. In ...