Analysis of Viscosity Change and Oil Leakage Characteristics According to CaCO3 Particle Size and Anti-Sedimentation Agent Content on Bituminous Emulsion Mastic

This study analyzed the characteristics of viscosity change and oil leakage stability according to the average particle size and content of organic and mineral-based extenders such as CaCO3(CA) and anti-sedimentation (ASE) among materials consisting of bituminous emulsion mastic (BEM). The fabrication of samples for research was done using a melting method of 2L capacity with the production mixing ratio of BEM used in the actual manufacturing process as a standard mixing ratio. Each sample size was adjusted to 16 μm, 5 μm, 2 μm, 1.4 μm and 1 μm, the average particle size of CA as a variable, and the content of ASE for each particle size was set to increase from 1 to 6 times the standard mixing ratio. The analysis found that in all average particle sizes of CA, the viscosity increased as the content of anti-sedimentation increased, and the viscosity was highest at the CA average particle size of 16 μm. The viscosity increased as the average particle size decreased at 5 μm, 2 μm, 1.4 μm and 1 μm. In addition, it was confirmed that the oil leakage stability increased as the average particle size of CA decreased, and the content of ASE increased. The evaluation results showed that specimens that met both workability and oil leakage stability conditions were the specimens with 4 times and 5 times the ASE content at the CA average particle size of 2 μm, and those with twice the ASE content at the CA average particle size of 1.4 μm.

One-step fabrication of eco-friendly superhydrophobic fabrics for high-efficiency oil/water separation and oil spill cleanup

Oily wastewater and oil spill caused by oil leakage accidents pose an extremely harmful to human health and environment. Thus, it is very important to exploit superhydrophobic separation materials and...

Study on Improving the Sealing Reliability of Fluid Connector

Aiming at the problem of sealing reliability of fluid connector products commonly used in hydraulic system, this paper studies the static seal and the sliding seal. The factors affecting the sealing such as spring force, sealing ring and life of spring are considered one by one and the sealing effect is teseted. The results showed that improved fluid connector can ensure that the hydraulic system is in the state of not even air intake or oil leakage while connecting and disconnecting at any time. The connector has been successfully applied to a certain model of launch vehicle.

Digital Twin-Driven Mating Performance Analysis for Precision Spool Valve

The precision spool valve is the core component of the electro-hydraulic servo control system, and its performance has an important influence on the flight control of aviation and aerospace products. The non-uniform surface topography error causes a non-uniform mating gap field inside the spool valve, which causes oil leakage and leads to deterioration of the spool valve performance. However, the current oil leakage calculation method only considers the influence of size errors, which is not comprehensive. Thus, how to characterize the mating behavior of the spool valve and its effect on oil leakage with consideration of surface topography errors is the key to evaluating the performance of the spool valve. This paper proposes a new way of analyzing the mating performance of precision spool valves, which considers the surface topography errors based on digital twin technology. Firstly, a general framework for the analysis of mating performance of precision spool valve based on a digital twin is proposed. Then, key technologies of assembly interface geometry modeling, matching behavior modeling and performance analysis are studied. Finally, a quantitative correlation between the mating parameters and the oil leakage of the precision spool valve is revealed. The method is tested on a practical case. This proposed method can provide theoretical support for the accurate prediction and evaluation of the mating performance of the precision spool valve.

Analisis Kerusakan Differential Pada Kendaraan HINO 260 FM (SH17) : Studi Kasus di PT. Hudaya Maju Mandiri

Differential or often known as the axle is a component in a car that functions to transmit engine power to the wheel axle that previously passed through the transmission and propeller shaft. Problems or damage to the differential varies, ranging from a buzzing sound in the differential, damage to the gear pinion, worn gear pinion, oil leakage in the differential. In this case, finding the differential is damaged in the pinion gear, the pinion teeth are worn and damaged so that the vehicle cannot run or the torque from the engine cannot be continued due to damage to the differential. The differential on the HINO 260 FM vehicle has a lot of damage to the differential, because the overload. Overload capacity or weight of the vehicle's payload exceed the standard limits and there is a differential damage in the pinion gear. Differential atau sering dikenal dengan nama gardan adalah komponen pada mobil yang berfungsi untuk meneruskan tenaga mesin ke poros roda yang sebelumnya melewati transmisi dan propeller shaft. Problem atau kerusakan pada differential bermacam-macam, mulai dari bunyi berdengung pada bagian differential, kerusakan pada gear pinion, gear pinion aus, kebocoran oli pada differential. Pada kasus kali ini, menemukan kerusakan differential pada bagian pinion gear, gigi pinion aus dan rusak sehingga membuat kendaraan tidak bisa berjalan atau tenaga putaran dari mesin tidak bisa diteruskan keroda akibat kerusakan pada differential. Differential pada kendaraan Hino 260 FM sering sekali rusak, dikarenakan daya angkut yang melebihi kapasitas. Dan hal inilah yang biasanya menjadi penyebab kerusakan differential pada bagian pinion gear.

Preparation of Super-Hydrophobic 3D Porous Nanocomposites by One Step Reaction at Room Temperature for Water Treatment

Melamine sponge (MS) has the characteristics of multilayer network structure, high porosity, adjustable pore structure, and low price, which is considered to be an ideal material for oil leakage treatment. Here, a facile, economical, environmental friendly, and one step reaction was developed to fabricate Ag nanoparticles (NPs) decorated MS composite with tannic acid (TA) as a reducing agent. By reduction reaction, the super-hydrophobic and super-oleophylic surface of the MS–TA–Ag composite was formed, demonstrating a single selectivity for oil and water. Thus, the adsorption capacity of MS–TA–Ag composites for various oils/organic solvents can reach 48~129 times its own weight and and display superior efficiency to separate oil/organic solvent from the water. In addition, the MS–TA–Ag composite has stable super-hydrophobicity and reusability. It is exciting that modified MS exhibits excellent chemical stability properties after a long processing time with strong alkali, strong acids, and salt solutions. The simple strategy provides a method for the preparation of large-scale oil spill cleaning and recovery materials.