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  • Open access
  • 186 Reads
Low Altitude Local Rocket Aerodynamics Analysis and Experimental Testing
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The Thai traditional rocket (Bang Fai) or local rocket festival is well known in Northeast Thailand, which is held annually during the months of April to June for highest altitude competition in several categories by their sizes and types. The aims of this paper are to analyze the aerodynamics characteristics of the local rocket designing by using CFD, then construct the rocket and perform the experimental testing. There are 13 rocket models with different nose cones and fins including the traditional rocket model. The simulations were performed at a velocity of 128 kt (66 m/s). From simulation results, the rocket model with ogive nose cone has the lowest turbulence intensity. Although the turbulence intensity from different fin designs are not significantly difference, the clipped triangular fin model yields the smallest intensity region behind the rocket. It is found that the model with ogive nose cone with elliptical fin has the lowest drag force of 6.37 N while the ogive nose cone with clipped triangular fin and the original design drag are 7.40 N and 8.50 N respectively. Even though, all of rocket designs in this study have stability margin higher than the recommended stability margin, the ogive nose cone and clipped triangular fin model has the highest stability margin of 6.0, which is chosen for rocket construction and experimental testing. The performance between the proposed rocket design model and the original local rocket are proven by launching experiment. The rocket contains 6 kg of solid fuel, which is classified as Bang Fai Muen. By observing the exhaust smoke, launchings of the rocket showed that the original rocket reached the altitude approximately 600 m and the new design reached around 700 m. Therefore, the ogive nose cone is capable of reducing drag while the clipped triangular fin can increase the directional stability during the launch, which permit the rocket to achieve higher altitude.

  • Open access
  • 106 Reads
The Feasibility of Thailand Lunar Simulant(TLS-01) Biomining
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The Lunar Mission has involved with the different conditions from earth such as gravity, air pressure, temperature, lunar regolith and others. As a part of nuclear fusion project known in mini sun on earth, the Helium-3 is a fuel source from the moon. The clean energy will plan to use for extracting water, construction materials, fertilization, lunar agriculture and sustainable living in finally. The ore processing and extraction are needed to study more. The samples of lunar regolith have investigated from Apollo project until the created-prepared lunar regolith simulant from earth resource in various countries such as USA Europe India Russia and Thailand. The Thailand Lunar Simulant(TLS-01) in this research were reported the four parameters as physical properties, chemical composition, mineralogical characteristic, particle size distribution and the progress of mineral extraction by biomining method. The results found that the basalt rock from Trad province can use for the simulant material. The biomining can extract the necessary elements from the lunar regolith simulant which are Sodium Magnesium Iron Aluminum Titanium and Silica.

  • Open access
  • 79 Reads
Understanding XR Learning Experiences in Undergraduate Logistics Programs

With emerging technologies and extended reality (XR) technology on the rise in logistics education programs, we evaluated the perceptions of Thai undergraduate students and faculty members on XR learning experiences using an XR Literacy Framework. The XR Literacy Framework was adapted from NMC Horizon Project’s digital literacy framework and informed by the research work of Pehlivanis, Papagianni, and Styliadi (2004), and DHL’s Key Developments and Implications (2019).

Questions focused on perspectives on XR usage in logistics management undergraduate programs in Ladkrabang, Bangkok, Thailand in the key areas of training levels and confidence in application of XR technology. All research constructs were measured using multiple-item 5-point Likert scales and target respondents were evaluated in terms of XR for logistics management familiarity. The data was collected from a judgment sample of respondents on a voluntary basis and analyzed with SPSS software.

A single t-test survey was performed to assess if there was a statistically significant difference between the sample qualified and the overall population. In both cases of training and confidence in application of XR technology, levels were deemed to be low.

Following responses on identified critical points, we recommend further study on increasing XR training in undergraduate logistics education programs and building confidence in practical application of XR technology.

  • Open access
  • 186 Reads
Simulation of life-supporting conditions on exoplanets by CANSAT

Nowadays, our earth has been fast-changing and have a various problem that effect to the ecosystem which has to adaptation but if a human can’t adapt to live in the earth, we may have to settle in an exoplanet. So how do we know that it can settle? At present, we have a lot of technology in the survey of various exoplanets but it has many budgets. Would it be better if we can save the budget on this part? So we invent a satellite the size of a can or we call it “CANSAT” to survey and keep various data which can bring to analyze the possibility to live on that planet. We keep various data from CANSAT that are volume of nitrogen, oxygen and carbon, brightness, temperature, pressure, humidity, the volume of ozone, and intensity of UV ray. We designed it to be able to send data to a ground station to prevent data loss if we can’t keep CANSAT. We simulate the situation from earth because we can’t go to the exoplanet by releasing CANSAT from the sky by drone and rocket that we built. The height of the drone is about 300 meters and the height of the rocket is about 550. Various data bring to analyze and compare with height. The result from the analysis is certain that we can settle because we live on earth and we analyze that data about the origin of life (Abiogenesis) because if have a creature, we may develop to settle on that exoplanet.

  • Open access
  • 172 Reads
Development and Mechanical properties of the first Thailand lunar regolith simulant (TLS-01)

With the Artemis goal of establishing human colonies in 2024, the Moon is now considered to be the primary target that must be conquered before proceeding to further ventures. Lunar regolith simulants are an essential material that must replicate the crucial character of the actual lunar regolith in various major aspects, including both physical and chemical properties. For sustained research development progress, it is essential for Thailand to develop a lunar simulant that is widely available and cheap to produce while representing the crucial characteristics of lunar regolith. In this paper, Thailand Lunar regolith Simulant type 1 (TLS-01), the first developed lunar regolith simulant in Thailand, will be presented with its mechanical properties as the main topic. Their mechanical properties were tested by the Multi-stage direct shear testing method (KU-MDS shear testing method) and demonstrate that their results are within the range with other lunar regolith simulants. Moreover, its properties are within range of the actual lunar regolith collected from Apollo missions. The origin source of the TLS-01 was chosen based on the similarity in geochemical properties of the previous survey of basaltic rock in Thailand and lunar regolith from Apollo missions. Thus, TLS-01 demonstrated suitable mechanical and chemical properties to be the first lunar regolith simulant for Thailand and Southeast Asia.

  • Open access
  • 341 Reads
COVID-19 on Job Insecurity and Mental Health of Thai Airways International Flight Attendants
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Abstract: The ongoing COVID-19 pandemic, which plunging the entire aviation industry into a deep crisis and putting hundreds of thousands of airline jobs at risk, affects Thai Airways flight attendants, with high stressors towards their job insecurity. As human factors are considered critical aspects that influence safety in aviation, this study aimed to 1) examine the impact of job insecurity on Thai Airways flight attendants’ mental health during COVID-19 disruption, 2) investigate how they managed themselves to regain life satisfaction during the indefinite suspension of all scheduled flights, and 3) measure psychological distress development, a year after the airline announcement to halt all air services. The GHQ-12 (General Health Questionnaire-12), a self-administered instrument, was adopted to screen flight attendants’ psychological well-being. Five male and seven female flight attendants, who had the highest scores, indicating worse conditions between 9 to 11 of total scores 12, were selected for the in-depth online interviews in February 2020 and a year later in January 2021. The result showed psychological strains caused by prolonged stress that can lead to safety-related performance decrements when flight attendants need to perform safety-critical roles in emergencies. Hence, the flight attendants should have a mental health check-up before resuming regular commercial flight operations.

  • Open access
  • 127 Reads
A Sprawling Posture Robot with a Flexible Spine for Efficient Locomotion in Various Gravity Environments from Earth, to Mars, and Moon

Low gravity is one of the most challenging aspects of robot space exploration. Due to changing gravitational force, the locomotion performance of a legged robot tends to reduce when the gravity decreases. Recently, quadrupedal robots have increasingly been promoted for space exploration. Most existing studies have mainly developed robot locomotion with an erect posture and focused on the use of leg functionality. However so far, the robot locomotion with a sprawling posture and a flexible spine has not been fully investigated. According to this research gap, we present here the sprawling posture robot with a flexible spine inspired by geckos for low-gravity locomotion enhancement. The gecko-inspired robot is constructed with the 3-DOF spine and the 4-DOF legs. The movement of the robot is controlled by a central pattern generator (CPG). The experiments were performed in a physical simulation under the gravities of Earth, Mar, and the Moon. The experimental results show that, due to the lateral bending movement of the flexible spine with a C-Shaped standing wave pattern, the locomotion speed of the robot is increased by 100%, compared to the one with a traditional fixed spine under each gravity. Based on these results, a sprawling-type quadruped robot with a flexible spine will shed a new light for the future study of robot space exploration under low-gravity conditions.

  • Open access
  • 93 Reads
From Calculus of variations to Fractional Euler–Lagrange equations.
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The role of calculus of variations in aerodynamics studies is related to the study of optimization problems in aircraft dynamics which include the study of the optimal trajectory using the least fuel consumption or optimum geometry in aircraft design or optimal distances of the aircraft or rocket trajectory subjects to certain conditions. In the calculus of variation, the optimal solution is obtained by the Euler-Lagrange equation. The fractional calculus is a mathematical theory for calculating derivatives and integrals where the order can be fractions or complex numbers. There are numerous applications of this theory in various fields of science and engineering today. In this paper, we have applied theory of fractional calculus to formulate the generalized term of Euler-Lagrange equation. The ubiquitous equation in mechanics and other field.

  • Open access
  • 100 Reads
Structural Analysis of Thai Space Consortium-1 Satellite based on Falcon 9 Launch Vehicle Vibration Profile
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During the launch environment, dynamic loads are transmitted to satellites located within the payload fairing, leading to the failures of its structure. Therefore, the analysis of natural frequency can be utilized to observe the response of the main structure and avoid interaction with launch vehicle dynamics. In this paper, the structural analysis for Thai Space Consortium (TSC) satellite is presented through the concept of Low-Earth Orbit Earth observation satellite. The Falcon 9 launch vehicle environment is applied as a primary reference. First, the different designs of the small satellite structure consist of horizontal, and Modular layout are created. Second, the numerical simulation using the Finite Element Model (FEM) is accomplished to observe the structural analyses especially, the failure stress factor. The quasi-static and displacement are considered. Then, the vibration analysis is conducted for each load, such as natural frequency responses, sine specification, and random load to meet the launcher's requirements. The comparison of two designs is validated. The results show that the static load and the vibration are acceptable and not critical to the satellite's main structure.

  • Open access
  • 66 Reads
LoRa Multi-Channel Access to Doppler effect in CubeSat Radio Communication

Currently, Communication Technology have an important role in our daily life. The technology of Internet of Things (IoTs), which is most likely will be deployed in conjunction with satellite technology. The currently developed technologies are based on satellite constellations in low Earth orbit, including CubeSat and nanosatellite constellations. This paper presents the results of a theoretical investigation of the feasibility of successful communication between a LoRa in a ground station and a LoRa in the satellite, including the Doppler effect that an IoT device may experience. Several sets of essential transmission parameters were considered, and their successful or unsuccessful outcomes were simulated. In addition, a laboratory testing was conducted to find out whether different transmission frequencies would affect the transmission quality considerably or not. It was found that, in principles, a few sets of essential transmission parameters would provide feasible communication between a LoRa on the ground and a LoRa in a satellite. In addition, the laboratory testing showed that different frequencies in the range of 923–925 MHz did not affect the transmission quality differently. The theoretical and experimentally acquired parameter values reported in this paper may directly benefit developers of new applications of LoRa and IoTs satellite in their effort to design an effective communication scheme for their system.

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