Engineering Research Express最新文献

{"title":"Heater power supply fluctuations in metal oxide gas sensors: impact on gas sensing performance","authors":"Tarik Saidi, Abderrazak Manser, Tesfalem Welearegay","doi":"10.1088/2631-8695/ad734f","DOIUrl":"https://doi.org/10.1088/2631-8695/ad734f","url":null,"abstract":"This work reports the impact of deviations in heater current caused by an imprecise 5V power source on the parameters utilized in gas sensing modules in MQ series towards 62 ppm of Ethanol vapor. The gas sensing experiments involved three MQ series gas sensors under lab-made chamber for continuous Ethanol vapor measurement. To investigate how heaters’ current irregularities, affect the gas sensing performance parameters, the sensor’s response/recovery time, pattern recognition techniques of principal component analysis (PCA) and hierarchical cluster analysis (HCA) were employed. While minor voltage drops (±100 mV) may not significantly affect sensing resistance (R_S) due to real-time input voltage (Vin) adjustment, a constant current source is essential for heating resistance (R_H). The study revealed that a slight increase (±3 mA) in heater supply, particularly from 154 mA (94 °C) to 157 mA (96 °C), can significantly accelerate the recovery time (Trec) of the MQ-7 sensor from 484 s to 316 s, resulting in a difference of over 150 s. This improvement can be attributed to the desorption of gas molecules at higher temperatures, aiding in sensor cleaning. However, this small change does not significantly affect the response time (Tres), which remains between 245 and 295 s at worst. Our gas sensor exhibits enhanced sensitivity and operational stability thanks to a calibrated circuit and stable 5V power supply. Strong correlations between normalized response and sensing films’ temperatures, with a correlation coefficient of 0.985, provide insights into the relationship between heater currents, temperature effects, and gas sensitivity. These findings offer insights for optimizing sensing performance under gas exposure conditions.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"11 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A study of XLPE insulation failure in power cables under electromagnetic stress","authors":"Babu Naik Gugulothu, Sanjay Lakshminarayanan, Madhu Palati, Suresh Haleyur Lakshmegowda, Mahipal Bukya","doi":"10.1088/2631-8695/ad7443","DOIUrl":"https://doi.org/10.1088/2631-8695/ad7443","url":null,"abstract":"Underground cables with cross-linked polyethylene (XLPE) insulation are integral to medium voltage (MV) power transmission systems, ensuring continuous electricity supply amidst operational challenges and environmental conditions. However, the reliability of these cables can be compromised over time due to aging and installation-related factors, particularly at joints and terminations. This study offers a comprehensive analysis of how various defects, including spherical air voids, pinholes, and irregularities in semiconducting layers, affect electric field and potential distributions within cable end terminations using COMSOL Multiphysics software. Through detailed simulations, the study identifies significant variations in electric field strength caused by these defects, highlighting critical stress concentration areas. In this study, it assumed that the cable and termination have the same cross-section. By analyzing these simulations, the study provides insights into optimizing cable design and installation practices to enhance the reliability and lifespan of underground power transmission systems. This study introduces a novel approach by combining advanced COMSOL Multiphysics simulations with a detailed analysis of defect impacts on electric field distributions, offering new insights into stress concentrations and degradation at cable terminations. Simulation outcomes reveal significant variations in electric field strengths due to air voids and pinholes in cables and terminations: for 2 mm voids, up to <inline-formula>\u0000<tex-math>\u0000<?CDATA $2.45times {10}^{6}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mn>2.45</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mrow><mml:mn>10</mml:mn></mml:mrow><mml:mn>6</mml:mn></mml:msup></mml:math>\u0000<inline-graphic xlink:href=\"erxad7443ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> V mm⁻¹ near the conductor and 56.5 V mm⁻¹ at termination. These findings enhance the understanding of XLPE-insulated cable behavior under electromagnetic stress, providing a basis for mitigating failures and improving overall system performance.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"2 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A CMOS front-end circuit for capacitive sensors with zero adjustment","authors":"Fangxia Sun, Shoulong Tang","doi":"10.1088/2631-8695/ad7440","DOIUrl":"https://doi.org/10.1088/2631-8695/ad7440","url":null,"abstract":"A front-end circuit with measurement zero adjustment was designed using 180nm CMOS technology for capacitive sensors. A series-switched capacitor composed of capacitor under test and MOSFETs is controlled by a clock signal to convert capacitance to current. The minimum output current at fixed capacitance can be adjusted by applying different voltage to realize zero adjustment. The test shows that the output current has a monotonic linear relationship with the measured capacitance, with capacitance detection range reaches 50pF-3000pF and an output current range of 0.59mA-22.2mA. The maximum span of multiple measurements was lower than 8.37uA. The stable time is less than 23ms and sensitivity is 19.8uA/pF. This circuit is suitable for long-distance and wide-range capacitance detections.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"30 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A hybrid optimization for distributed generation and D-STATCOM placement in radial distribution network: a multi-faceted evaluation","authors":"Anbuchandran S, Arumuga Babu M, Silas Stephen D, Thinakaran M","doi":"10.1088/2631-8695/ad734c","DOIUrl":"https://doi.org/10.1088/2631-8695/ad734c","url":null,"abstract":"The deregulation of the power system, upward growth in electrical energy demand and network expansion have resulted in an increasing integration of distributed generation (DG) and distribution static synchronous compensator (D-STATCOM) into radial distribution systems (RDS). Nonetheless, the optimal allocation of these devices is highly important to derive immense benefits. This investigation narrows down on optimizing DG and D-STATCOM placement in IEEE 33-bus RDS with a view to increase bus voltages, decrease power losses as well as maximize economic gains. The study undertakes a comprehensive analysis comparing the technical, economic and environmental performance of DG and D-STATCOM; thereby enabling power engineers to make informed choices concerning which device will be most advantageous when it comes to delivering power in RDS. A fuzzy enhanced firefly optimization (FEFO) approach is proposed for the optimization and a multifaceted evaluation in terms of technical, financial and environmental is presented for effective decision-making on distributed energy resource deployment. D-STATCOM and wind DG integrations led to notable reductions in power loss and pollutant emissions, highlighting their effectiveness in improving power quality and reducing reliance on fossil fuels. While wind DG incurred a higher installation cost ($3,100,749.2) compared to D-STATCOM ($90,566.6), it achieved greater yearly power loss cost savings ($69,198 versus $47,619). FEFO’s efficiency in optimization stands out, aiding engineers in making informed decisions for optimizing D-STATCOM and wind-DG integration in the IEEE-33 RDS, ultimately enhancing system performance and cost-effectiveness through proactive planning. The integration of D-STATCOM and wind DG led to a significant improvement in distribution system efficiency, with D-STATCOM reducing real power loss by 28.7% and reactive power loss by 27.8%, while wind DG achieved greater reductions of 41.8% in real power loss and 37.5% in reactive power loss, alongside reductions in pollutant emissions of 1.5% and 2.2%, respectively.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"10 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonlinear dynamic analysis of an inclined micro-beam under a moving mass","authors":"Liang Zhao, Shun-Li Wang","doi":"10.1088/2631-8695/ad722d","DOIUrl":"https://doi.org/10.1088/2631-8695/ad722d","url":null,"abstract":"Nonlinear vibration of an inclined simply supported micro-beam under a moving mass is investigated for Euler–Bernoulli beam theory (EBT) and Timoshenko beam theory (TBT) respectively. Based on a modified couple stress theory (MCST) and the von-Karman geometric nonlinearity, the nonlinear coupled dynamic equations of the system are established through the Hamilton’s principle with the assumed mode method. A wide range of numerical examples are employed to study the influence of slenderness ratio, cross-section height, inclined angle, the size and velocity of the moving mass and the scale factor of the material on the solutions of nonlinear and linear, the solutions of EBT and TBT and the solutions of moving mass and moving load. By comparing the differences between the nonlinear and linear solutions under different parameters and beam theories, the importance and significance of nonlinear dynamic analysis of the inclined micro-beam are revealed.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"156 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing the drilling process parameters of AZ91 based hybrid composites using TOPSIS and grey relational analysis","authors":"Hariharasakthisudhan P, Logesh K, Sathish Kannan, Sivakumar R, Sathickbasha K","doi":"10.1088/2631-8695/ad72cd","DOIUrl":"https://doi.org/10.1088/2631-8695/ad72cd","url":null,"abstract":"AZ91 is a popular magnesium alloy that contains aluminum (Al), zinc (Zn), and small amounts of other elements that offers a good balance of mechanical properties and corrosion resistance, making it suitable for various applications such as automotive, aerospace, sports, and biomedical. The current research works focused on optimizing drilling process parameters such as cutting speed, feed rate, a set of standard tools, and biofriendly coolants against the surface roughness and axial thrust force for AZ91/ nano hBN/ micron TiB₂ hybrid composites. Taguchi L18 orthogonal array was used to design the drilling experiments. The axial thrust force and surface roughness of the drilled hole were observed as response of the experiments. Based on the results from TOPSIS and GRA, the optimal conditions were determined to be a spindle speed of 65 m/min, feed rate of 1 mm/rev, using a High-Speed Steel (HSS) tool, and Liquid Nitrogen (LN) coolant for 1 wt% of nano hBN in the hybrid composite. These parameters resulted in the lowest axial thrust force and surface roughness, highlighting their effectiveness in optimizing the drilling performance of AZ91/TiB2/hBN composites.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"23 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of a system that changes the speed of the motor for a given radius of curvature of an autonomous car while taking turn","authors":"R Chandramouli, Rajesh Ghosh, Mahitha T, Gangadhar K Siva, Uday K, Hymavathi B, Sai Rakesh G","doi":"10.1088/2631-8695/ad734e","DOIUrl":"https://doi.org/10.1088/2631-8695/ad734e","url":null,"abstract":"This work endeavors to create a system capable of autonomously regulating a car’s speed while navigating turns, based on the curvature of the road. The primary objective is to bolster the safety and stability of autonomous vehicles by curbing excessive speeds during turns, thereby mitigating the risk of accidents such as loss of control or rollovers. The approach blends theoretical analysis with practical application, involving computations to ascertain the ideal speed for a given curve radius. Factors such as vehicle mass, wheel specifications, and centrifugal and gyroscopic forces are considered in these calculations. Subsequently, an algorithm is devised and implemented using Arduino Uno and programmed within the Arduino IDE software environment. The system employs sensors to monitor the motor’s speed and adjust the motor’s speed accordingly. Both simulated scenarios and real-world experiments validate the system’s efficacy in maintaining safe speeds during turns. The study concludes by underlining the potential of this system to heighten the safety and dependability of autonomous vehicles, while also proposing future avenues for research, such as integration with broader autonomous driving frameworks and field testing across diverse environmental conditions.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"66 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of reinforcement on vibration control in adhesively bonded single lap joints: a numerical and experimental validation","authors":"Naveen Kumar Akkasali, Sandhyarani Biswas","doi":"10.1088/2631-8695/ad734b","DOIUrl":"https://doi.org/10.1088/2631-8695/ad734b","url":null,"abstract":"In this growing world, it is imperative to employ innovative techniques that effectively manage the structural response of materials without inducing adverse effects on the original structure. This can be achieved mainly by changing the material and geometrical features of the adhesive. In this work, an attempt has been made to control the eigenvalues of adhesively bonded single-lap joints (SLJs) by reinforcing them with polymer patches. Numerical techniques were utilized to adhere the polymer patches to the single-lap bonded joints using ABAQUS software. Subsequently, the eigenvalue responses of SLJs, both with and without patches, were experimentally well agreed with the numerical predictions. The validated numerical model was then used to investigate its structural response by modifying the parameters such as patch shape, patch position, and adhesive geometry. Additionally, it has been observed that a square-shaped polymer patch at the overlapping edge is more effective in reducing the eigenvalues compared to patches of different shapes and positions. The eigenvalue response follows a declining trend as the adhesive thickness increases, forming thicker bonds.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"14 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bond behavior of reinforcing steel bars in metakaolin – calcium carbide residue-based geopolymer concrete","authors":"Jacqueline Obeng, Anthony Andrews, Mark Adom-Asamoah, Jones Owusu-Twumasi","doi":"10.1088/2631-8695/ad722b","DOIUrl":"https://doi.org/10.1088/2631-8695/ad722b","url":null,"abstract":"The bond property of concrete is a key characteristic of concrete that affect the structural activity of reinforced concrete beams. Concrete produced from geopolymer has the prospect to replace concrete produced from ordinary Portland cement (OPC) for structural applications. Therefore, this research evaluates the bond behavior of metakaolin-calcium carbide residue (CCR)-based geopolymer concrete for use in <italic toggle=\"yes\">in situ</italic> structural applications. Comparative studies were carried out on concrete made of geopolymer and OPC. The embedment lengths (5<italic toggle=\"yes\">ϕ</italic> and 7<italic toggle=\"yes\">ϕ</italic>) and reinforcing bar diameters (14 and 16 mm) were varied and the bonding activity of the different concrete types was studied. Additionally, the qualities of the concrete produced were assessed, including density, ultrasonic pulse velocity, and compressive and flexural strengths. Generally, the metakaolin-CCR-based geopolymer concrete samples had the best mechanical properties, followed by metakaolin-based geopolymer and OPC concrete, respectively. Bond activity enhanced when embedment length and diameter of reinforcement were reduced in all types of concrete. Thus, with a reinforcing bar diameter of 14 mm and an embedment length of 5<italic toggle=\"yes\">ϕ</italic>, the average bond strength of the metakaolin-CCR-based geopolymer concrete was 14.3MPa, which was 18.87% and 105.46% higher than that of the metakaolin-based geopolymer and OPC concrete, respectively. Influenced by experimental conclusions, it can be established that the metakaolin-CCR-based geopolymer concrete has the capacity to be used in place of OPC concrete in bond applications where steel reinforcing bars are employed.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"10 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of process variables on microhardness and surface roughness in SPIF of beryllium copper","authors":"Nikesh Verma, Vikas Kumar","doi":"10.1088/2631-8695/ad72ce","DOIUrl":"https://doi.org/10.1088/2631-8695/ad72ce","url":null,"abstract":"Beryllium copper is gaining the popularity among material research community owing to its excellent properties like high strength-to-weight ratio, corrosion resistance, and high electrical conductivity. This work aims to enhance the performance of ‘Single Point Incremental Forming (SPIF)’ of Beryllium copper using desirability function analysis (DFA). Feed rate (FEED), Step size (SS), wall angle (WA), and tool rotation speed (TRPM) are the four vital input parameters that have been chosen. This research investigates the effects of variations in these four factors on the truncated cone’s surface roughness and microhardness. After testing different levels of these parameters, the optimal setting using desirability function analysis was 0.4 mm step size, 200 mm min⁻¹ feed rate, 47° wall angle, and a tool rotation speed of 1500 rpm with desirability of 70.7%. Further, measured data was subjected to Analysis of Variance (ANOVA) tests to determine the significance of all parameters on the responses. Results of the ANOVA analysis showed that the step size and tool rotation speed had the most profound impact on surface roughness and micro-hardness respectively. Feed rate and wall angle were the least significant parameters in affecting the surface roughness and micro-hardness respectively. The confirmation experiments validated fine-tuning with predicted and experimental values.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"9 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}