Archive

Abstract:

This paper presents the design of high gain and bandwidth reflectarray for 5G networks operating in Millimeter-wave (mmWave) at 28GHz and 38GHz. A polymer benzocylobutene (BCB) is used as substrate material having a dielectric constant of 2.65, and low tan δ ≤ 0.0008. The unit cell is optimized to achieve full phase reflection of 334^o over the operating band. Enhanced gain, wider bandwidth and full phase reflection are achieved by making air holes in the substrate. A 15×15 elements reflectarray based on the optimized unit cell is designed to enhance the gain. The reflectarray is excited through horn feed having a gain of 15dB with a  feeding distance of 165mm and 0⁰ offsets. A gain of 23dB was observed at lower operating frequency (i.e 28GHz) and 25dB at upper operating frequency (i.e  38GHz)with a bandwidth of 2GHz  at both operating frequencies.

Keywords:

Reflectarrays,gain,efficiency,unit cell,microwave,millimeter-wave,5G,

Refference:

I. D. Spectrum, “Euro-5g – Supporting the European 5G Initiative,” 2017.
II. D. G. Berry, R. G. Malech, and W. A. Kennedy, “The Reflectarray Antenna,” IEEE Trans. Antennas Propag., vol. 11, no. 6, pp. 645–651, 1963, doi: 10.1109/TAP.1963.1138112.
III. D. Oloumi, S. Ebadi, A. Kordzadeh, A. Semnani, P. Mousavi, and X. Gong, “Miniaturized reflectarray unit cell using fractal-shaped patch-slot configuration,” IEEE Antennas Wirel. Propag. Lett., vol. 11, pp. 10–13, 2012, doi: 10.1109/LAWP.2011.2181478.
IV. F. Boccardi, T. L. Marzetta, and B. Labs, “Five Disruptive Technology Directions for 5G,” no. February, pp. 74–80, 2014.
V. M. Hashim Dahri and M. Y. Ismail, “Performance analysis of reflectarray resonant elements based on dielectric anisotropic materials,” Procedia Eng., vol. 53, pp. 203–207, 2013, doi: 10.1016/j.proeng.2013.02.027.
VI. M. Abd-Elhady, W. Hong, and Y. Zhang, “A Ka-band reflectarray implemented with a single-layer perforated dielectric substrate,” IEEE Antennas Wirel. Propag. Lett., vol. 11, pp. 600–603, 2012, doi: 10.1109/LAWP.2012.2201128.
VII. M. H. Jamaluddin et al., “Design, fabrication and characterization of a dielectric resonator antenna reflectarray in ka-band,” Prog. Electromagn. Res. B, vol. 25, no. 25, pp. 261–275, 2010, doi: 10.2528/PIERB10071306.
VIII. M. H. Jamaluddin et al., “A dielectric resonator antenna (DRA) reflectarray,” Eur. Microw. Week 2009, EuMW 2009 Sci. Prog. Qual. Radiofreq. Conf. Proc. – 39th Eur. Microw. Conf. EuMC 2009, vol. 6164, no. October, pp. 25–28, 2009, doi: 10.1109/EUMC.2009.5296579.
IX. M. H. Dahri, M. H. Jamaluddin, M. I. Abbasi, and M. R. Kamarudin, “A Review of Wideband Reflectarray Antennas for 5G Communication Systems,” IEEE Access, vol. 5, pp. 17803–17815, 2017, doi: 10.1109/ACCESS.2017.2747844.
X. Muhammad Sohaib Jamal, Samad Baseer, Iqtidar Ali, Farooq Faisal. : ‘ANALYSIS OF CHANNEL MODELLING FOR 5G MMWAVE COMMUNICATION’. J. Mech. Cont.& Math. Sci., Vol.-15, No.-9, September (2020) pp 278-293. DOI : 10.26782/jmcms.2020.09.00023
XI. S. Costanzo, F. Venneri, A. Borgia, and G. Di Massa, “A single-layer dual-band reflectarray cell for 5G communication systems,” Int. J. Antennas Propag., vol. 2019, pp. 8–11, 2019, doi: 10.1155/2019/9479010.

XII. S. W. Oh, C. H. Ahn, “Reflect-array element using variable ring with slot on ground plane,” Electron. Lett., vol. 45, doi: 10.1049/el.2009.2693.
XIII. S. V. Polenga, A. V. Stankovsky, R. M. Krylov, A. D. Nemshon, Y. A. Litinskaya, and Y. P. Salomatov, “Millimeter-wave waveguide reflectarray,” 2015 Int. Sib. Conf. Control Commun. SIBCON 2015 – Proc., pp. 0–3, 2015, doi: 10.1109/SIBCON.2015.7147335.
XIV. S. Costanzo, F. Venneri, and G. Di Massa, “c,” 13th Eur. Conf. Antennas Propagation, EuCAP 2019, no. EuCAP, pp. 1–3, 2019.
XV. S. Costanzo, I. Venneri, G. Di Massa, and A. Borgia, “Benzocyclobutene as Substrate Material for planar millimeter-wave structures: Dielectric characterization and application,” J. Infrared, Millimeter, Terahertz Waves, vol. 31, no. 1, pp. 66–77, 2010, doi: 10.1007/s10762-009-9552-0.
XVI. S. Costanzo, F. Venneri, A. Borgia, I. Venneri, and G. Di Massa, “60 GHz microstrip reflectarray on a benzocyclobutene dielectric substrate,” IET Sci. Meas. Technol., vol. 5, no. 4, pp. 134–139, 2011, doi: 10.1049/iet-smt.2010.0132.
XVII. S. Costanzo and F. Venneri, “Miniaturized fractal reflectarray element using fixed-size patch,” IEEE Antennas Wirel. Propag. Lett., vol. 13, pp. 1437–1440, 2014, doi: 10.1109/LAWP.2014.2341032.
XVIII. S. Costanzo, F. Venneri, G. Dimassa, A. Borgia, A. Costanzo, and A. Raffo, “Fractal reflectarray antennas: State of art and new opportunities,” Int. J. Antennas Propag., vol. 2016, 2016, doi: 10.1155/2016/7165143.
XIX. T. S. Rappaport et al., “Millimeter wave mobile communications for 5G cellular: It will work!,” IEEE Access, vol. 1, pp. 335–349, 2013, doi: 10.1109/ACCESS.2013.2260813.
XX. T. S. Rappaport, Y. Xing, G. R. MacCartney, A. F. Molisch, E. Mellios, and J. Zhang, “Overview of Millimeter Wave Communications for Fifth-Generation (5G) Wireless Networks-With a Focus on Propagation Models,” IEEE Trans. Antennas Propag., vol. 65, no. 12, pp. 6213–6230, 2017, doi: 10.1109/TAP.2017.2734243.
XXI. Tallapalli Chandra Prakash, Srinivas Samala, Kommabatla Mahender. : ‘MULTICARRIER WAVEFORMS FOR ADVANCED WIRELESS COMMUNICATION’. J. Mech. Cont.& Math. Sci., Vol.-15, No.-7, July (2020) pp 252-259. DOI : 10.26782/jmcms.2020.07.00020
XXII. W. An, S. Xu, F. Yang, and S. Member, “A Metal-Only Re fl ectarray Antenna Using Slot-Type Elements,” vol. 13, pp. 1553–1556, 2014.
XXIII. W. Lee, M. Yi, J. So, and Y. J. Yoon, “Non-resonant conductor reflectarray element for linear reflection phase,” Electron. Lett., vol. 51, no. 9, pp. 669–671, 2015, doi: 10.1049/el.2015.0194.

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Abstract:

Pelton Turbine is the hydraulic turbine, type of impulse turbine. An Impulse turbine generally suitable for the low flow rate and high head. The discharge water from the nozzle impacts the bucket of the Pelton wheel to produce the hydropower. There are some reasons behind the failure of the Pelton bucket like as: silt erosion, cavitation, fatigue etc. The main reason behind the fatigue failure is the material property and stress concentrations. A high concentration of stresses occurs at the root of the bucket due to its cantilever structure each time a bucket experiences the impact of the water jet. In this work, there are two materials AISI 1020 Steel and Structural Steel have been considered for analyzing the Pelton bucket. For the 3D CAD model of Pelton bucket Solid works 14.0 and for simulation work ANSYS 15.0 software has been used. In simulation work analysis types were static structural. This paper focuses on von-mises stress, total deformation of von-mises strain to analyze the suitable material for the Pelton bucket. From the obtained results it has been observed that among both materials Structural Steel is suitable for bucket due to low-stress concentration, total deformation and strain.

Keywords:

ANSYS,AISI 1020,Structural Steel,Pelton Bucket,Solidworks,

Refference:

I. Munson, Bruce Roy, T. H. Okiishi, and Wade W. Huebsch. “Turbomachines.” Fundamentals of Fluid Mechanics. 6th ed. Hoboken, NJ: J. Wiley & Sons, 2009.
II. https://en.wikipedia.org/wiki/Pelton_wheel
III. G. Boyle. Renewable Energy: Power for a Sustainable Future, 2nd ed. Oxford, UK: Oxford University Press, 2004.
IV. Ji-Qing, L. and Saw, M.M.M., Fatigue analysis of simple and advanced hoop pelton turbine buckets. American Scientific Research Journal for Engineering, Technology, and Sciences (ASRJETS), 29(1), pp.371-378 2017.
V. George, N.J., Sabu, S., Joseph, K.R. and Alex, A.C., Static analysis on Peltonwheel bucket. International Journal of Engineering Research and Technology (IJERT) 20(1) 2014.
VI. Vinod, B., Biksham, B. and Janeyulu, V., 2014. Design and analysis of Pelton wheel. International Journal & Magazine of Engineering, Technology, Management and research, 1(12), pp.549-558.
VII. Reddy, N.H., Design and static analysis of Pelton turbine bucket. In 2nd National Conference in Recent Trends in Mechanical Engineering (p. 156) 2015.
VIII. Bright Hub Engineering. Pelton Turbine [Online] (August 26, 2015).
IX Sharma, V. and Dhama, S.K., 2014. Analysis of stress on Pelton turbine blade due to jet impingement. International Journal of Current Engineering and Technology. [On-line], 4(4), pp.2414-2417.
X Chitrakar, S., Solemslie, B.W., Neopane, H.P. and Dahlhaug, O.G., 2020. Review on numerical techniques applied in impulse hydro turbines. Renewable Energy.
XI Pressure distribution at inner surface of a selected pelton bucket” Binaya K.C., Bhola Thapa.”
XII Prajapati, P.V.M., Patel, P.R.H. and Thakkar, P.K.H., 2015. Design, Modeling & Analysis of Pelton Wheel Turbine Blade. vol, 3, pp.159-163.

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Abstract:

Degradation of on-field PV modules is inevitable but a normal process; however, it is a challenging task to explore the causes behind it. Manufacturers and researchers, to know the causes of degradation, employ both destructive and non-destructive procedures. In this study, nine different PV modules from three different manufacturers have been taken and their electrical output data, over several days, has been collected. The electrical parameters of PV modules are compared with the nameplate data to analyze the average yearly degradation in the electrical performance. Moreover, using visual inspection different degradation modes are identified. Finally, it is concluded that environment is not the only factor but the material used and the processing techniques employed by manufacturers are equally responsible for degradation in the output efficiency of PV modules.

Keywords:

Electrical Performance,Degradation modes,PV Reliability,Visual Inspection,PV modules,

Refference:

I. E. S. Kopp, V. P. Lonij, A. E. Brooks, P. L. Hidalgo-Gonzalez, and A. D. Cronin, “I-V curves and visual inspection of 250 PV modules deployed over 2 years in tucson,” in Conference Record of the IEEE Photovoltaic Specialists Conference, 2012, pp. 3166–3171, doi: 10.1109/PVSC.2012.6318251.

II. K. Olakonu, J. Belmont, S. Tatapudi, J. Kuitche, and G. Tamizhmani, “Degradation and failure modes of 26-year-old 200 kW power plant in a hot-dry desert climate,” in 2014 IEEE 40th Photovoltaic Specialist Conference, PVSC 2014, 2014, pp. 3207–3210, doi: 10.1109/PVSC.2014.6925618.

III. K. Yedidi, S. Tatapudi, J. Mallineni, B. Knisely, J. Kutiche, and G. Tamizhmani, “Failure and degradation modes and rates of PV modules in a hot-dry climate: Results after 16 years of field exposure,” in 2014 IEEE 40th Photovoltaic Specialist Conference, PVSC 2014, 2014, pp. 3245–3247, doi: 10.1109/PVSC.2014.6925626.

IV. Kothari D. P., Anshumaan Pathak, Utkarsh Pandey. : ‘COMPARATIVE STUDY OF DIFFERENT SOLAR PHOTOVOLTAIC ARRAYS CONFIGURATION TO MITIGATE NEGATIVE IMPACT OF PARTIAL SHADING CONDITIONS’. J. Mech. Cont. & Math. Sci., Vol.-16, No.-2, February (2021) pp 102-111. DOI : 10.26782/jmcms.2021.02.00009

V. M. Chicca and G. Tamizhmani, “Nondestructive techniques to determine degradation modes: Experimentation with 18 years old photovoltaic modules,” 2015, doi: 10.1109/PVSC.2015.7355709.

VI. M. Kumar and A. Kumar, “Performance assessment and degradation analysis of solar photovoltaic technologies: A review,” Renewable and Sustainable Energy Reviews, vol. 78. pp. 554–587, 2017, doi: 10.1016/j.rser.2017.04.083.

VII. R. Bhoopathy, O. Kunz, M. Juhl, T. Trupke, and Z. Hameiri, “Outdoor photoluminescence imaging of photovoltaic modules with sunlight excitation,” Prog. Photovoltaics Res. Appl., vol. 26, no. 1, pp. 69–73, 2018, doi: 10.1002/pip.2946.

VIII. Reddy M. Sai Krishna, D. Elangovan. : ‘RURAL ELECTRIFICATION WITH RENEWABLE ENERGY FED DC MICRO GRID’. J. Mech. Cont.& Math. Sci., Vol.-15, No.-8, August (2020) pp 25-38. DOI : 10.26782/jmcms.2020.08.00004.

IX. S. Ali et al., “A comprehensive study of 18-19 years field aged modules for degradation rate determination along with defect detection and analysis using IR, EL, UV,” Proc. 2018 15th Int. Bhurban Conf. Appl. Sci. Technol. IBCAST 2018, vol. 2018–January, pp. 28–35, 2018, doi: 10.1109/IBCAST.2018.8312180.

X. S. Dolnicar et al., “Scholar (3),” Annals of Tourism Research, vol. 3, no. 1. pp. 1–2, 2015.

XI. S. M. Shrestha et al., “Determination of dominant failure modes using FMECA on the field-deployed c-Si modules under hot-dry desert climate,” IEEE J. Photovoltaics, vol. 5, no. 1, pp. 174–182, 2015, doi: 10.1109/JPHOTOV.2014.2366872.

XII. S. Tatapudi et al., “Defect and safety inspection of 6 PV technologies from 56,000 modules representing 257,000 modules in 4 climatic regions of the United States,” in 2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017, 2017, pp. 1–5, doi: 10.1109/PVSC.2017.8366381.

XIII. V. Sharma and S. S. Chandel, “Performance and degradation analysis for long term reliability of solar photovoltaic systems: A review,” Renewable and Sustainable Energy Reviews, vol. 27. pp. 753–767, 2013, doi: 10.1016/j.rser.2013.07.046.

XIV. W. ~H. Press et al., “Scholar (32),” Convergence in the information industries. Telecommunications, broadcasting and data processing 1981-1996, vol. 26, no. Peter lang. pp. 125–150, 2005.

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Abstract:

The limiting used of the alloys of aluminum since the formability is low at room temperature. To plan and grow more parts made of aluminum, new forming systems, for example, warm framing hydroforming and warming hydroforming processes have been explored to solve the low formability. The effect of temperature on the mechanical properties of aluminum 1100 sheet alloy is investigated at different temperature levels and strain rates using the test of uni-axial tensile. A warming forming tool for sheet metal is designed and manufactured. Four temperatures levels were used in this experiments (25 , 100  200  and 300 ). The drawing speeds that were used in these experiments were (3, 6, and 9 mm/min). Before design, the warming hydro-punch system, the analysis of this system is done in ANSYS software to choose the optimum die radius and then the results of experiments are simulated. The results of experiments showed that the appropriate hydroforming temperature and drawing speed of 1100 aluminum alloy are 300 and 3mm/min respectively. The FE simulation of strain distribution matched reasonably well with the experimental results.

Keywords:

Deep drawing process,1100 aluminum alloy,Formability,hydro-punch,ANSYS,warming hydroforming process,

Refference:

I. ANSYS 19.0 R1 User guide, 2019.
II. Agarwal A., Seretse O.M., Pumwa J. : ‘FINITE ELEMENT AND TAGUCHI RESPONSE ANALYSIS OF THE APPLICATION OF GRAPHITE ALUMINIUM MMC IN AUTOMOTIVE LEAF SPRING.’ J. Mech. Cont.& Math. Sci., Vol.-15, No.-7, July (2020) pp 168-179. DOI : 10.26782/jmcms.2020.07.00013
III. Billur, E. (2008). Warm Hydroforming Characteristics of Stainless Steel Sheet Metals.‏

IV. Cevdet Meriç, Enver Atik, Erdoğan Özkaya (1997). Investigation of Deformation Temperatures and Strain Rate Effects’ on the Mechanical Properties of Al 99.0. Pamukkale Univ Muh Bilim Derg. 3(1): 293-298.

V. Hein, P., & Vollertsen, F. (1999). Hydroforming of sheet metal pairs. Journal of Materials Processing Technology, 87(1-3), 154-164.

VI. Hani Aziz Ameen (2010). “ Study the stresses in deep drawing process using conical die”, Journal of Kerbala University,Vol.8, No.1,Sientific,(in Arabic) .
VII. Koç, M. (Ed.). (2008). Hydroforming for advanced manufacturing. Elsevier.‏
VIII. Koç, M., Agcayazi, A., & Carsley, J. (2011). An experimental study on robustness and process capability of the warm hydroforming process. Journal of manufacturing science and engineering, 133(2).‏‏

IX. Li, D., & Ghosh, A. (2003). Tensile deformation behavior of aluminum alloys at warm forming temperatures. Materials Science and Engineering: A, 352(1-2), 279-286.‏

X. Modi, B., & Ravi Kumar, D. (2013). Effect of friction and lubrication on formability of AA5182 alloy in hydroforming of square cups. In Materials Science Forum (Vol. 762, pp. 621-626). Trans Tech Publications Ltd.

XI. Moneer H. Al-Saadi, Hani Aziz Ameen & Rawa Hamed M. Al-Kalali (2011). “Influence of Metal Type on the Deep Drawing Force by Experimental and Finite Element Method”, Engineering and Technology Journal, Vol.29, No.13.
XII. Modi, B., & Ravi Kumar, D. (2013). Effect of friction and lubrication on formability of AA5182 alloy in hydroforming of square cups. In Materials Science Forum (Vol. 762, pp. 621-626). Trans Tech Publications Ltd.‏

XIII. Naka, T., Torikai, G., Hino, R., & Yoshida, F. (2001). The effects of temperature and forming speed on the forming limit diagram for type 5083 aluminum–magnesium alloy sheet. Journal of Materials Processing Technology, 113(1-3), 648-653.‏
XIV. Nakasone Y. and Yoshimoto S. (2006). “Engineering Analysis with ANSYS Software”, Department of Mechanical Engineering, Tokyo University of Science.
XV. Shah, M., Billur, E., Sartkulvanich, P., Carsley, J., & Altan, T. (2011, August). Cold and Warm Hydroforming of AA754‐O Sheet: FE Simulations and Experiments. In AIP Conference Proceedings (Vol. 1383, No. 1, pp. 690-697). American Institute of Physics.‏

XVI. Umair Aftab, Muhammad Mujtaba Shaikh, Muhammad Ziauddin Umer. : ‘A NEW AND RELIABLE STATISTICAL APPROACH WITH EFFECTIVE PROFILING OF HARDNESS PRESERVING SAMPLES IN TIG-WELDING, THERMAL TREATMENT AND AGE-HARDENING OF ALUMINUM ALLOY 6061’. J. Mech. Cont.& Math. Sci., Vol.-15, No.-11, November (2020) pp 108-118. DOI : 10.26782/jmcms.2020.11.00010

XVII. Yuan, S., Qi, J., & He, Z. (2006). An experimental investigation into the formability of hydroforming 5A02 Al-tubes at elevated temperature. Journal of Materials Processing Technology, 177(1-3), 680-683.‏

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Abstract:

Infrastructure advancement reflects its key role in the financial and socio-economic progression of Pakistan. Project execution and accomplishment majorly depend on the leadership competencies. The dynamics of leadership define the influence of a leader i.e. project manager in lead on his team to complete any type of project and make it a success. The objective of the study is to investigate the influence of project managers’ leadership competencies in light of theory explaining “The Competency School of Leadership” coupled with specific project types on project success outcomes for transport infrastructure projects. A structured questionnaire-based survey was conducted to collect data using purposive sampling from individuals that are currently or have been involved in recently completed projects in the transport infrastructure development of Lahore. A total of 152 useful responses were returned. Findings obtained using moderated regression analysis using Andrew Hayes ‘process’ technique suggest that leadership competence of project managers is insignificant for successful completion of the projects under a particular project type. Results suggest that the project managers in a leadership position when effectively and efficiently utilize their competencies of intellectual strength, managerial procedures and emotional balance for successful actualization of transport infrastructure projects. Moreover, it has been found that project managers in these projects exhibit efficacious leadership competencies that are substantial without regard to any project type in certain for their successful completion.

Keywords:

Transport infrastructure,leadership competency,project type,project success,process moderation,competency school of leadership,

Refference:

I. Abdolmehdi Salehizadeh, Jaffar Mahmudi. : ‘A SYSTEMS DYNAMICS MODEL FOR PROJECT MANAGEMENT SYSTEMS OF PROJECT-BASED ORGANIZATION.’ J. Mech. Cont. & Math. Sci., Vol.-15, No.-3, March (2020) pp 140-149. DOI : 10.26782/jmcms.2020.03.00011
II. Aiken, L. S., West, S. G., & Reno, R. R. (1991). Multiple regression: Testing and interpreting interactions. Sage.
III. Al-Shaaby, A., & Ahmed, A. (2018). How do we measure project success? A Survey. Journal of Information Technology and Software Engineering, 8(229).
IV. Aubert, B., Bazan, A., Boucham, A., Boutigny, D., De Bonis, I., Favier, J., … & Lees, J. P. (2002). The BABAR detector. Nuclear instruments and methods in physics research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 479(1), 1-116.
V. Batool, A., & Abbas, F. (2017). Reasons for delay in selected hydro-power projects in Khyber Pakhtunkhwa (KPK), Pakistan. Renewable and Sustainable Energy Reviews, 73, 196-204.
VI. Beins, B. C. (2017). Research method: A tool for life. Cambridge University Press. Bentahar, O., & Ika, L. A. (2019). Matching the Project Manager’s Roles to Project Types: Evidence From Large Dam Projects in Africa. IEEE Transactions on Engineering Management.
VII. Boyatzis, R. E. (2008). Leadership development from a complexity perspective. Consulting Psychology Journal: Practice and Research, 60(4), 298.
VIII. Bryde, D. (2008). Perceptions of the impact of project sponsorship practices on project success. International Journal of Project Management, 26(8), 800-809.
IX. Camps-Walsh, G., Aivas, I., & Barratt, H. (2009). How can value-based pricing improve access and adoption of new treatments? 2020 health, 1-105.
X. Carvalho, M. M. D., & Rabechini Junior, R. (2015). Impact of risk management on project performance: the importance of soft skills. International Journal of Production Research, 53(2), 321-340.
XI. Charmaz, K., & Belgrave, L. L. (2007). Grounded theory. The Blackwell Encyclopedia of Sociology. Chou, J. S., & Yang, J. G. (2012). Project management knowledge and effects on construction project outcomes: An empirical study. Project Management Journal, 43(5), 47-67.
XII. Dainty, A. R., Cheng, M. I., & Moore, D. R. (2005). Competency-based model for predicting construction project managers’ performance. Journal of Management in Engineering, 21(1), 2-9.
XIII. Dulewicz, V., & Higgs, M. (2005). Assessing leadership styles and organizational context. Journal of Managerial Psychology, 20(2), 105-123.
XIV. Dulewicz, V., & Higgs, M. (2003). Leadership at the top: The need for emotional intelligence in organizations. The International Journal of Organizational Analysis, 11(3), 193-210.
XV. Dulewicz, S. V., & Higgs, M. J. (2004). Design of a new instrument to assess leadership dimensions and styles. Selection and Development Review, 20(2), 7-12.
XVI. Dvir, D. O. V., Sadeh, A., & Malach-Pines, A. (2006). Projects and project managers: The relationship between project managers’ personality, project types, and project success. Project Management Journal, 37(5), 36-48.
XVII. Fausing, M. S., Joensson, T. S., Lewandowski, J., & Bligh, M. (2015). Antecedents of shared leadership: empowering leadership and interdependence. Leadership & Organization Development Journal, 36(3), 271-291.
XVIII. Finch, H. (2006). Comparison of the performance of varimax and promax rotations: Factor structure recovery for dichotomous items. Journal of Educational Measurement, 43(1), 39-52.
XIX. Feger, A. L. R., & Thomas, G. A. (2012). A framework for exploring the relationship between project manager leadership style and project success. The International Journal of Management, 1(1), 1-19.
XX. Geoghegan, L., & Dulewicz, V. (2008). Do project managers’ leadership competencies contribute to project success? Project Management Journal, 39(4), 58-67.
XXI. Guba, E. G., Lincoln, Y. S., Denzin, N., & Lincoln, Y. (1998). The landscape of qualitative research: Theories and issues. Competing Paradigms in Qualitative Research, 105-117.
XXII. Ha, T. P. T., & Tran, M. D. (2018). Review of Impacts of Leadership Competence of Project Managers on Construction Project Success. International Journal of Emerging Trends in Social Sciences, 4(1), 15-25.
XXIII. Hayes, A. F. (2017). Introduction to mediation, moderation, and conditional process analysis: A regression-based approach. Guilford Publications.
XXIV. Heumann, T., Bergemann, D., & Morris, S. (2015). Information and volatility. Journal of Economic Theory, 158, 427-465.
XXV. Sanaullah Jamali, Abdul Sattar Soomro, Muhammad Mujtaba Shaikh. : ‘THE MINIMUM DEMAND METHOD – A NEW AND EFFICIENT INITIAL BASIC FEASIBLE SOLUTION METHOD FOR TRANSPORTATION PROBLEMS’. J. Mech. Cont. & Math. Sci., Vol.-15, No.-10, October (2020) pp 94-109. DOI : 10.26782/jmcms.2020.10.00007

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Abstract:

In this research work, we consider the mathematical model of the Timoshenko beam (TB) problem in the form of a boundary-value problem of a system of ordinary differential equations. Instead of numerical solution using finite difference and finite volume methods, an attempt is made to derive the exact analytical solutions of the model with boundary feedback for a better and explicit description of the rotation and displacement parameters of the TB structure model. The explicit analytical solutions have been successfully found for the uniform and real-time variable load cases. The rotation and displacement profiles obtained through the analytical solutions accurately picture the structure of the beam under uniform and variable loads.

Keywords:

Timoshenko beam,Analytical solution,Rotation,Displacement,Uniform load,Variable load,

Refference:

I. A. W. Shaikh, XL Cheng (2013). Two non-standard finite difference schemes for the Timoshenko beam. AJMCSR Vol. 5(6): 107 –111.

II. Babak Mansoori, Ashkan Torabi, Arash Totonch. : ‘NUMERICAL INVESTIGATION OF STRENGTHENING THE REINFORCED CONCRETE BEAMS USING CFRP REBAR, STEEL SHEETS AND GFRP’. J. Mech. Cont.& Math. Sci., Vol.-15, No.-3, March (2020) pp 195-204. DOI : 10.26782/jmcms.2020.03.00016.

III. Cheng XL, Han W, Huang HC (1997). Finite element methods for Timoshenko beam, circular arch and Reissner-Mindlin plate problems. J. Comput. Appl. Math.,79(2): 215-234.

IV. Cheng XL, Xue WM (2002). Linear finite element approximations for the Timoshenko beam and the shallow arch problems. J. Comput. Math., 20: 15-22.

V. D. N. Arnold (1981). Discretization by finite elements of a model parameter dependent problem. Numer. Math., 37 (3): 405-421.

VI. Jou J, Yang SY (2000). Least-squares Finite element approximations to the Timoshenko beam problem, Appl. Math. Comput, 115(1): 63-75.

VII. Li L (1990). Discretization of the Timoshenko beam problem by the p and h/p versions of the finite element method. Numer. Math., 57(1): 413-420.

VIII. Loula AFD, Hughes TJR, Franca LP (1987). Petrov-Galerkin formulations of the Timoshenko beam problem. Comput.Meth. Appl. Mech. Eng., 63(2): 115-132.

IX. Loula AFD, Hughes TJR, Franca LP, Miranda I (1987). Stability, convergence and Accuracy of a new finite element method for the circular arch problem.Comput.Meth.Eng., 63(3): 281-303.

X. Timoshenko SP (1921). On the correction for shear of the differential equation for transverse Vibrations of prismatic bars, The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science,, 41(245): 744-746.

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Abstract:

We propose and implement a finite difference scheme for the numerical solution of the Timoshenko beam model without locking phenomenon. The averaging concept is used in approximating the function, and thus developing the scheme for elements. Finally, the system is discretized into the algebraic system using the proposed scheme and the numerical solution is attained. The numerical solutions are attained for a constant load and a variable load comprising linear and exponential functions. The mathematical model of the Timoshenko beam (TB) problem in the form of a boundary-value problem has been solved successfully for the rotation and displacement parameters. The results agree with other schemes in the literature for various values of the parameter and step size.

Keywords:

Timoshenko beam,Finite-difference solution,Rotation,Displacement,Constant load,Variable load,Interpolation,

Refference:

I. Cheng XL, Han W, Huang HC (1997). Finite element methods for Timoshenko beam, circular arch and Reissner-Mindlin plate problems. J. Comput. Appl. Math.,79(2): 215-234.
II. Cheng XL, Xue WM (2002). Linear finite element approximations for the Timoshenko beam and the shallow arch problems. J. Comput. Math., 20: 15-22.
III. D. N. Arnold (1981). Discretization by finite elements of a model parameter dependent problem. Numer. Math., 37 (3): 405-421.
IV. Faisal Hayat Khan, M. Fiaz Tahir, Qaiser uz Zaman Khan. : ‘NUMERICAL SIMULATION AND PERFORMANCE EVALUATION OF BEAM COLUMN JOINTS CONTAINING FRP BARS AND WIRE MESH ARRANGEMENTS.’ J. Mech. Cont. & Math. Sci., Vol.-16, No.-2, February (2021) pp 112-131. DOI : 10.26782/jmcms.2021.02.00010
V. Jou J, Yang SY (2000). Least-squares Finite element approximations to the Timoshenko beam problem, Appl. Math. Comput, 115(1): 63-75.
VI. Khalid H. Malik, Sanaullah Dehraj, Sindhu Jamali, Sajad H. Sandilo, Asif Mehmood Awan. : ‘ON TRANSVERSAL VIBRATIONS OF AN AXIALLY MOVING BEAM UNDER INFLUENCE OF VISCOUS DAMPING.’ J. Mech. Cont.& Math. Sci., Vol.-15, No.-11, November (2020) pp 12-22. DOI : 10.26782/jmcms.2020.11.00002
VII. Li L (1990). Discretization of the Timoshenko beam problem by the p and h/p versions of the finite element method. Numer. Math., 57(1): 413-420.
VIII. Li, F.L., Sun, Z.Z. (2007). A finite difference scheme for solving the Timoshenko beam equations with boundary feedback. J. Comput. Appl. Math., 200: 606–627.
IX. Loula AFD, Hughes TJR, Franca LP (1987). Petrov-Galerkin formulations of the Timoshenko beam problem. Comput.Meth. Appl. Mech. Eng., 63(2): 115-132.
X. Loula AFD, Hughes TJR, Franca LP, Miranda I (1987). Stability, convergence and Accuracy of a new finite element method for the circular arch problem.Comput.Meth.Eng., 63(3): 281-303.
XI. Sun, Z.Z., Zhu, Y.L. (2004). A second order accurate difference scheme for the heat equation with concentrated capacity. Numer. Math., 97: 379–395.
XII. Timoshenko SP (1921). On the correction for shear of the differential equation for transverse Vibrations of prismatic bars, The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science,, 41(245): 744-746.
XIII. W. Shaikh, XL Cheng (2013). Two non-standard finite difference schemes for the Timoshenko beam. AJMCSR Vol. 5(6): 107 –111.
XIV. Wang, Z.S. (2002). A second order L8 convergent difference scheme for linear hyperbolic equation with derivative boundary conditions. Numer. Math. J. Chinese Univ., 3: 212–224.
XV. Xu, G.Q., Feng, D.X. (2002). The Riesz basis property of a Timoshenko beam with boundary feedback and application. IMA Journal of Appl. Math., 67: 357 370.
XVI. Yan, Q.X., Feng, D.X. (2003). Feedback stabilization of nonuniform Timoshenko beam with dynamical boundary. Control Thery Appl., 20(5): 673–677.
XVII. Zietsman L., Van Rensburg, N.F.J., Van der Merwe, A.J. (2004). A Timoshenko beam with tip body and boundary damping. Wave Motion., 39: 199–211.

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