Danh Thanh Le

• Doctor of Philosophy
• Sinior Lecturer at University of Economics Ho Chi Minh City

This paper will develop the restoring model of a commercial pneumatic artificial muscle (PAM) based on a McKibben structure, which comprises an elastic element connected with a viscoelastic element in parallel. The elastic element is generated by compressed air inside the rubber bellow; meanwhile, the viscoelasticity is affected by the rubber mater...

Understanding wind effects on buildings is crucial for mitigating wind-induced damage. This study focuses on the aero dynamic impact of wind on low-rise buildings, with a particular emphasis on vulnerable roof sheathing. Using a k-ε turbulence model, the pressure distribution on a 27° sloped roof is investigated at different free-stream flow veloci...

Most diesel engines typically operate with high excess air in part load. Implementing air intake restriction with exhaust gas recirculation (EGR) could be a viable option for mitigating NOx emission and soot, particularly when utilizing biodiesel, attributing to biodiesel's inherent oxygen content. This study examines the effect of intake air throt...

The optimized experiment model is often developed to provide fewer costs, time consumed and error for experiment. Nanoparticles can be utilized as fuel additives to improve lubrication performance. Nevertheless, the concentration of nanoparticles is crucial for fuel lubricity. This work describes the use of response surface methodology (RSM) based...

The energy crisis and climate change have brought attention to developing alternative fuels. Waste tire pyrolysis oil is one of the most effective and renewable alternative fuels. Still, the TPO fuel had poor anti-wear properties than either biodiesel or diesel fuel, resulting in the studies conducted with nanoparticles. The lubricity of fuel is on...

Issues such as rising fuel prices, fuel costs, and lowering reserves highlight the importance of research into sustainable fuels derived from biological sources. This study is focused on experiments on a CI engine using ethanol and propanol-based ternary blends. Palm biodiesel is kept constant at 40% volumetric concentration, while diesel and ethan...

Diesel engines are one of the most popular reciprocating engines on the market today owing to their great thermal efficiency and dependability in energy conversion. Growing concerns about the depletion of fossil resources, fluctuating prices in the market, and environmental issues have prompted the search for renewable fuels with higher efficiencie...

Huge and continuously growing non-renewable energy consumption due to human daily activities is accountable for the fossil fuel source crisis in recent decades. The growing concern about the emissions from internal combustion engines also impels the development of new energy sources to replace or reduce conventional non-renewable energy usage. In t...

This paper presents a low stiffness nonlinear vibration isolator using a pneumatic spring with an auxiliary chamber which is shortened by LSNVI. Firstly, the mechanical model of the isolator, which is constructed by two opposite stiffness mechanisms includes the load bearing mechanism (LBM) and the stiffness corrected mechanism (SCM), is introduced...

Most of the world’s energy requirements are still derived from natural resources. This will result in a catastrophic energy crisis with negative environmental consequences. The increased energy supply will result in greater consumption of non-renewable sources. The production of biomass producer gas (BPG) from biomass gasification has received sign...

A dynamometer test was commonly used to find the optimum biodiesel blend ratio. Nonetheless, it has a significant disadvantage which was due to the high time consuming and financial commitment required to undertake this procedure. Only a few studies have used grey-Taguchi method (GTM) to optimize coconut oil-diesel fuel blends utilizing various par...

This paper focuses on analyzing the dynamic response of an innovated quasi-zero stiffness pneumatic vibration isolator (QZSPVI) using two mechanisms, including wedge and semicircle cam. Different from other studies relating quasi-zero stiffness isolation system, the pneumatic cylinder in this paper works as an air spring in order to easily adjust t...

The purpose of this paper is to design a control algorithm for a 2-DoF rotary joystick model. Firstly, the structure of the joystick, which composes of two magneto-rheological fluid actuators (shorten MRFA) with optimal configuration coupled perpendicularly by the gimbal mechanism to generate the friction torque for each independent rotary movement...

This paper will develop a novel electro-hydraulic actuator with energy saving characteristics. This system is able to work in differential configurations through the shifting algorithm of the valves, meaning that this developed system can be adjusted flexibly to obtain the desirable working requirements including the high effectiveness of energy re...

Homogeneous charge compression ignition (HCCI) is considered an advanced combustion method for internal combustion engines that offers simultaneous reductions in oxides of nitrogen (NOx) emissions and increased fuel efficiency. The present study examines the influence of intake air temperature (IAT) and premixed diesel fuel on fuel self-ignition ch...

Biodiesel has gained popularity in diesel engines as a result of the rapid decline of fossil fuels and population growth. The processing of biodiesel from non-edible Moringa Oleifera was investigated using a single-step transesterification technique. Both fuels had their key physicochemical properties measured and investigated. In a common-rail die...

The objective of this paper is to study the effect of coconut oil biodiesel (COB)-diesel blends on exhaust particulate matter (PM) emissions and fuel injection responses in an unmodified turbocharged four-stroke common-rail direct injection (CRDI) diesel engine. Characterization of COB and their blends has been conducted to ascertain the applicabil...

It has been widely accepted worldwide, that the greenhouse effect is by far the most challenging threat in the new century. Renewable energy has been adopted to prevent excessive greenhouse effects, and to enhance sustainable development. Malaysia has a large amount of biomass residue, which provides the country with the much needed support the for...

This paper will broaden our previous works about the asymmetric and quasi-zero stiffness oscillator named AQZSO. In this paper, the dynamic stiffness of the AQZSO will be investigated. Then, the condition for which the minimum dynamic stiffness is quasi-zero around the equilibrium position is also determined. By using Multi-Scale method, the fundam...

As well known, nonlinear vibration isolation models may offer potential effectiveness for isolating low frequency vibrations. Therefore, this paper will introduce a nonlinear vibration isolation model, featuring asymmetrical and quasi-zero stiffness characteristics. Firstly, the physical model of the nonlinear vibration oscillation is shown, includ...

Due to the time-varying nonlinear dynamic, uncertain model and hysteresis characteristics of the pneumatic artificial muscle (PAM) actuator, it is not easy to apply model-based control algorithms for monitoring, as well as controlling, the operation of systems driven by PAM actuators. Hence, the main aim of this work is to propose an intelligent co...

Renewable alternatives to fossil fuels, such as biodiesel, are necessary to lessen emission of greenhouse gases that are causing climate change. Using a high-pressure, medium-duty, common-rail, turbocharged four-cylinder diesel engine, this work studies the effect of adding Cocos nucifera biodiesel to conventional diesel on exhaust emissions, engin...

A two-step transesterification process was employed in the biodiesel production from non-edible Alexandrian Laurel. The key physicochemical properties of the Alexandrian Laurel biodiesel (ALB), diesel and blends of both fuels were compared and analyzed. The effects of blending biodiesel (ALB) and petroleum diesel on engine performance, combustion a...

The diesel engine is one of the solutions to slow down fossil fuel depletion due to its high efficiency. However, its high pollutant emission limits its usage in many fields. To improve its efficiency and emissions, a conventional mechanical fuel injection system (MFI) was be replaced with common rail direct injection (CRDI) system for the purpose...

Biodiesels from coconut and palm cooking oil are viable alternatives to diesel fuel due to their environmental sustainability and similar physicochemical properties compared to diesel. In the present study, these fuels were tested separately in a diesel engine by blending with fossil diesel in proportions of 10%, 20%, 30% and 40% by volume. Experim...

In this paper, a novel low frequency isolation model (LFIM) which is built by integrating the wedge-roller-spring and cam-roller-spring mechanism is proposed. Due to the stiffness opposite of two mechanisms, the LFIM can obtain the low dynamic stiffness, meaning that the system can obtain the desirable low resonant frequency. Instead of using mecha...

In this study, an experimental apparatus was used to produce dried shrimp. From experiments with various air velocities and temperatures, the drying constant, moisture transfer coefficient and moisture diffusivity were obtained by using a Bi-Di correlation. An equation for determining the drying constant was established to determine the drying para...

As known, the aim of this paper is to present the field hysteresis behavior of a BMR actuator via identifying the hysteresis model. In order to realize this purpose, firstly, a BMR actuator is manufactured. The feature of this actuator has two disks which are rotated in opposite direction at the same speed and two coils are placed directly on each...

Improvement of the isolation effectiveness of the isolation system using negative stiffness structure (NSS) named "system with NSS" by introducing an adaptive sliding mode control algorithm is presented in this paper. The control strategy is to employ a radial basis function neural network (RBFNN) model to approximate the equivalent control effort...

A novel active vibration isolation system using negative stiffness structure (active system with NSS) for low excitation frequency ranges (< 5 Hz) is developed successfully. Here, the negative stiffness structure (NSS) is used to minimize the attraction of vibration. Then, the fuzzy sliding mode controller (FSMC) is designed to improve the vibratio...

This paper designs and fabricates a vibration isolation model for improving vibration isolation effectiveness of the vehicle seat under low excitation frequencies. The feature of the proposed system is to use two symmetric negative stiffness structures (NSS) in parallel to a positive stiffness structure. Here, theoretical analysis of the proposed s...

The aim of this paper is to propose a vibration isolation system using negative stiffness structure for isolating low frequency vibrations. In this paper, the dynamic stiffness characteristic of the system will be presented clearly. The relationship between the configurative parameters and the stiffness of the elastic element, for which the dimensi...

The most important characteristic of a vibration isolator are its natural frequency and load supporting capacity. The vibration isolation quality in low excited frequencies (input frequencies) is considerably improved by reducing the natural frequency of system. In this way, however, load supporting capacity of a linear vibration isolating system c...