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Author: search.filters.author.Thongsri, JatupornSubject: search.filters.subject.Finite element analysis

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    Vibration analysis of 28 kHz horn transducer for ultrasonic cleaning based on harmonic response analysis
    (2022-01-01)
    Phophayu, Suchada
    ;
    Thongsri, Jatuporn
    The Horn Transducer (HT) is one of the key components in ultrasonic applications, consisting of a front mass, piezoelectric, and back mass parts. Previously, most of the research focused on vibration study of the front mass part based on modal analysis, but the other parts were ignored; therefore, the research results have limitations to actual usage. This research presents the vibration analysis of HT included all parts, based on harmonic response analysis (HRA). First, a conventional HT of 28 kHz, 50 W, 220 V, front mass-radius (R) of 29 mm, and height (H) of 5 mm was investigated for the vibration analysis. Next, proposed designs were also investigated by varying the R as 27 mm - 32 mm, and H as 4 mm - 8 mm. All results were analyzed to find a suitable shape and investigated the designs that affected the vibration. The simulation results revealed that the longitudinal amplitude depends on R and H. In addition, the simulation results were consistent with an experiment and previous work. Finally, the suitable design with R of 29 mm and H of 7 mm provided the optimum vibration at 27,250 Hz. The outcomes of this research were applied to develop a high-performance ultrasonic cleaner.
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    A proper shape of the trailing edge modification to solve a housing damage problem in a gas turbine power plant
    (2021-04-01)
    Jansaengsuk, Thodsaphon
    ;
    Kaewbumrung, Mongkol
    ;
    Busayaporn, Wutthikrai
    ;
    Thongsri, Jatuporn
    To solve the housing damage problem of a fractured compressor blade (CB) caused by an impact on the inner casing of a gas turbine in the seventh stage (from 15 stages), modifications of the trailing edge (TE) of the CB have been proposed, namely 6.5 mm curved cutting and a combination of 4 mm straight cutting with 6.5 mm curved cutting. The simulation results of the modifications in both aerodynamics variables C<inf>l</inf> and C<inf>d</inf> and the pressure ratio, including structural dynamics such as a normalized power spectrum, frequency, total deformation, equivalent stress, and the safety factor, found that 6.5 mm curved cutting could deliver the aerodynamics and structural dynamics similar to the original CB. This result also overcomes the previous work that proposed 5.0 mm straight cutting. This work also indicates that the operation of a CB gives uneven pressure and temperature, which get higher in the TE area. The slightly modified CB can present the difference in the properties of both the aerodynamics and the structural dynamics. Therefore, any modifications of the TE should be investigated for both properties simultaneously. Finally, the results from this work can be very useful information for the modification of the CB in the housing damage problem of the other rotating types of machinery in a gas turbine power plant.
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    The optimum design of micro gripper for lifetime improvement based on fatigue analysis and six sigma analysis
    (2017-01-01)
    Boonkaew, Pisut
    ;
    Thongsri, Jatuporn
    This article reports a problem in hard disk drive manufacturing (HDD) process and a practical solution. A traditional micro gripper of stainless steel 304, practically used in an HDD factory, has a low life expectancy. Therefore, the fatigue analysis was employed to solve this problem. Firstly, 27 cases of possible designs of micro gripper were proposed according to the full factorial design of six sigma (6σ) analysis. Each case is different regarding the micro grippers shapes which are degree, radius, and length. Secondly, 3D models of the micro gripper for all cases were created and transferred to the finite element analysis to simulate the equivalent stress and the compressive force. After the simulation completed, we found that the optimum design of micro gripper has 457.9 MPa of the equivalent stress and 0.991 N of the compressive force, which was less than those of the traditional design. Finally, the optimum design was brought to analyze in more details by using the fatigue analysis. The comparing results of simulation showed that the maximum equivalent stress and the compressive force of the optimum design compared to the traditional design were reduced 14.5% and 19.4%, respectively. These make approximately extending 136.5% of the life cycle and increasing 17.5% of the safety factor. This improvement was expected that it could be able to extend the lifetime of the micro gripper and save up to 60 million dollars annually.