Godson Ikhazuangbe | University of Nottingham (original) (raw)

Papers by Godson Ikhazuangbe

International Journal of Research Publications

2019 International Symposium on Lightning Protection (XV SIPDA)

To ensure safety against lightning of wind turbines, high-voltage strike attachment tests specifi... more To ensure safety against lightning of wind turbines, high-voltage strike attachment tests specified in IEC 61400-24 are adopted to determine points of lightning attachments. These tests are usually conducted with a small blade sample as a representative of the full-scale blade length. However, incidents of lightning damage to wind turbines are still high, which indicates that small blade samples may not be an adequate representation of full-scale blade. In this paper, the extended vertical tri-pole cloud charge distribution model is used to compare the maximum electric field strength around a full-scale blade and that of a small blade section to show how they affect the maximum electric field strength required for the initiation of upward leaders from wind turbines. The results show an average difference of 15.16% between the maximum electric field relevant to the full-scale blade and that of the blade segment. Thus, a tolerance of 16.95 kV/m is recommended in using the blade segment in the laboratory testing. The results of the point of initiation of upward leader coincides with experimental data from lightning discharge attachments.

2019 International Symposium on Lightning Protection (XV SIPDA), 2019

When offshore wind turbines are polluted with salt, their surface characteristics change. Polluti... more When offshore wind turbines are polluted with salt, their surface characteristics change. Pollution affects the performance of the protection systems which can result in damages when it is hit by lightning. In this paper, two lightning protection systems (metallic cap and receptor methods), commonly in use, are applied on a full scale polluted offshore wind turbine to compare their performance. The lightning attachment to the offshore wind turbine blade is studied by analyzing the variations in maximum electric field strength required for the initiation of upward leader due to a vertical tri-pole cloud charge distribution. The computation is done for a polluted Vestas V100, 2 MW wind turbine. A new protection system (enhanced method) with higher lightning protection efficiency is developed. The performance of the metallic cap was then enhanced by adding a receptor at the middle of the blade. This modification has a significant impact on the electric field distribution of the blade. The new method was compared with the metallic cap and the tip receptor. The proposed method can markedly improve the lightning protection performance of offshore wind turbines. The results of the point of initiation of upward leader coincides with experimental data from lightning discharge attachments.

Journal of Green Engineering, 2017

Wind turbine can be destroyed when not adequately protected by the receptor. According to recent ... more Wind turbine can be destroyed when not adequately protected by the receptor. According to recent research, the size of the receptor plays a very important role in its efficiency. The effect of receptor size has not been well considered in literature and standards. This paper investigates six receptor sizes (10 mm, 15 mm, 20 mm, 25 mm, 30 mm and 35 mm receptor diameters), encompassing adopted sizes in literature. As the blade is rotated, the interception efficiency of various receptor sizes is evaluated on a modern wind turbine. The vertical tri-pole cloud charge model developed with finite element analysis is used to study the maximum electric field strength required for the initiation of upward leader from the blade surfaces. The interception efficiency of each receptor size is evaluated by comparing the maximum electric field strength. The results of the point of initiation of upward leader match well with those obtained by experimental measurements from lightning discharge attachments.

Nanotechnology is one of the most recent innovative disciplines in engineering with substantial b... more Nanotechnology is one of the most recent innovative disciplines in engineering with substantial benefits especially in nanomedicine. It holds a great potential with its application to create materials and devices within the range of the “nano” metric system. The creation of these vast materials can be applicable in diverse fields of science such as biology (bionanotechnology), nanoelectronics, and nanomedicine. This field seeks to combine both engineering and medicine to solve scientific and day-2-day problems. This paper reviews the applications of bionanotechnology in nanomedicine because; it is one of the mostly studied applications of nanotechnology, which is in biomedical sciences. Various areas such as drug development, drug production, drug delivery, and clinical diagnostics are analysed in the paper. The review paper highlights the relevance of nanotechnogy as an engineering field which is applicable in the field of biology and medicine.

International journal of simulation: systems, science & technology, 2017

When lightning attaches to the blade surface instead of the receptor, the blade and sometimes the... more When lightning attaches to the blade surface instead of the receptor, the blade and sometimes the entire wind turbine can be destroyed. The position of the receptor on the blade is important in determining the point of upward leader inception, stepped leader attachment, and the efficiency of the protection system. In this paper, a modern wind turbine; Vestas V100 with 2 MW rated power, 100 m rotor diameter, and 49 m long blade is used to investigate discrete receptor positions from the blade tip in order to find the most optimum location for the receptor. A numerical model of the vertical tri-pole cloud charge distribution model is developed with finite element analysis. The model is used to study the variations in maximum electric field strength required for the initiation of upward leader. By comparing the electric field strength as the blade is rotated, the receptor position is evaluated and optimized. The results of the point of initiation of upward leader coincides with experimental data from lightning discharge attachments.

103  Abstract— One of The major drawbacks for mobile nodes in wireless networks is power managem... more 103  Abstract— One of The major drawbacks for mobile nodes in wireless networks is power management. Our goal is to proposed a power control scheme that will help minimize energy consumption by appropriate adjustment of vehicles transmitter power, reduce network congestion, improve quality of service and collision avoidance in vehicular networks. Some of the importance of power control (PC) is improving spatial reuse, and increasing network capacity in mobile wireless communications. In this simulation we have evaluated the performance of existing rate algorithms compared with ACARS. Results show that ACARS is able to minimize the total transmit power in presence of of propagation processes and mobility of vehicles, by adapting to the fast varying channels conditions more than the other algorithms, which has some applications in vehicular networks as mentioned above.

International Journal of Computing and Digital Systemss

Mobile Ad-Hoc Networks (MANETs) is a spontaneous network that facilitates communication among nod... more Mobile Ad-Hoc Networks (MANETs) is a spontaneous network that facilitates communication among nodes without a centralized-control device unlike the infrastructure network category. One of the major challenges with MANETs and Vehicular Ad-Hoc Networks (VANETS) in mobile communication is the problem of connectivity between Mobile Nodes (MNs). This dilemma occurs as a result of high mobility of nodes moving farther from each other in MANETs or VANETS or moving away from the base station as in a cellular network or in a Mobile Infrastructure Ad Hoc Networks (MI-VANETs) as a result of propagation effects. Mobility of nodes is one of the major impacts of routing in every mobile and wireless network because of high dynamic nature of mobile environments. Several factors that influence the evaluation of the networks depend mainly on the implementation of the mobility model and the mobility model in turn depends on several factors of the environment. This paper evaluates the impact of communication and transmission range on network connectivity due to high mobility of nodes in a mobile and wireless environment. The results obtained through derived mobility metrics and Rate Adaption (RA) show that communication range has impact on connectivity in a highly mobile environment such as in vehicular communications. MN in this context is same as vehicles in this article.

Wind turbines are getting taller, moving offshore and coastal areas in search of better wind cond... more Wind turbines are getting taller, moving offshore and coastal areas in search of better wind condition but with a consequence of contact with salt water. With pollution from salt deposit, insulation strength of nonconductive (glass fiber) blade surface decreases, raising its conductivity, which could result in the blade going into competition with the receptors for lightning attachment. Streamers can initiate from the surface of the blade instead of the receptors and as an unintended lightning part, the blade is severely damaged when hit by lightning. This is a major problem for lightning protection of large wind turbine constructed near seaside or offshore. It is therefore necessary to investigate how a polluted blade surface affect the performance of the receptors. In this paper, the effect of pollution on the performance of the receptor is evaluated and estimated on a full scale offshore polluted and unpolluted wind turbine using COMSOL Multiphysics software. Simulation results c...

All mobile Communication systems are prone to both multiplicative and additive noise as a result ... more All mobile Communication systems are prone to both multiplicative and additive noise as a result of fading processes that contribute to noise in wireless channels. Losses occur due to the presence of tall buildings, trees, or linear addition of wide band or white noise with a constant spectral density respectively. It is also interested to study the impact of fading processes on vehicular communication that makes use of wireless principles and technology and investigate the performance of the network due to influence of propagation model. This paper evaluates the impact of fading processes on the throughput and energy efficiency of wireless systems in vehicular communication. In this paper we analyze the impact of multiplicative noise on rate algorithms and discussed the performances of various effects of this model on different rate algorithms.

Nanotechnology is one of the most recent innovative disciplines in engineering with substantial b... more Nanotechnology is one of the most recent innovative disciplines in engineering with substantial benefits especially in nanomedicine. It holds a great potential with its application to create materials and devices within the range of the " nano " metric system. The creation of these vast materials can be applicable in diverse fields of science such as biology (bionanotechnology), nanoelectronics, and nanomedicine. This field seeks to combine both engineering and medicine to solve scientific and day-2-day problems. This paper reviews the applications of bionanotechnology in nanomedicine because; it is one of the mostly studied applications of nanotechnology, which is in biomedical sciences. Various areas such as drug development, drug production, drug delivery, and clinical diagnostics are analysed in the paper. The review paper highlights the relevance of nanotechnogy as an engineering field which is applicable in the field of biology and medicine.

— One of The major drawbacks for mobile nodes in wireless networks is power management. Our goal ... more — One of The major drawbacks for mobile nodes in wireless networks is power management. Our goal is to proposed a power control scheme that will help minimize energy consumption by appropriate adjustment of vehicles transmitter power, reduce network congestion, improve quality of service and collision avoidance in vehicular networks. Some of the importance of power control (PC) is improving spatial reuse, and increasing network capacity in mobile wireless communications. In this simulation we have evaluated the performance of existing rate algorithms compared with ACARS. Results show that ACARS is able to minimize the total transmit power in presence of of propagation processes and mobility of vehicles, by adapting to the fast varying channels conditions more than the other algorithms, which has some applications in vehicular networks as mentioned above.

It is incredible to imagine the usefulness of biomedical science in the field of electronics. DNA... more It is incredible to imagine the usefulness of biomedical science in the field of electronics. DNA electronics, which is one of the most attractive applications of bionanotechnology is making its way in nanotechnology like a wild uncontrollable fire. DNA is regarded as a sturdy tool in the application of electrical transport with the support of semiconductor devices. With the aid of electronic properties exhibited by semiconductors, electron transfer exhibited by both N and P types semiconductors through donating and accepting electrons result to electrical transport that enables the production of electronic devices from nanomolecules. The process leads to nanoelectronics that are discussed in this paper. On the other hand, DNA molecules also showcase electronic coupling, which is identical to semiconductors. This paper examines DNA electronics with the light of current innovative research in bionanotechnology. Different DNA electronic applications are highlighted in addition to some of the products and devices that are bi-products DNA of electronics. The paper demonstrates the effectualness of DNA in bionanotechnology and its assimilation in electronic engineering. The article expatiates on the usefulness of DNA as a resourceful tool for the production of electronic devices.

International Journal of Research Publications

2019 International Symposium on Lightning Protection (XV SIPDA)

2019 International Symposium on Lightning Protection (XV SIPDA), 2019

Journal of Green Engineering, 2017

International journal of simulation: systems, science & technology, 2017

International Journal of Computing and Digital Systemss

Nanotechnology is one of the most recent innovative disciplines in engineering with substantial b... more Nanotechnology is one of the most recent innovative disciplines in engineering with substantial benefits especially in nanomedicine. It holds a great potential with its application to create materials and devices within the range of the " nano " metric system. The creation of these vast materials can be applicable in diverse fields of science such as biology (bionanotechnology), nanoelectronics, and nanomedicine. This field seeks to combine both engineering and medicine to solve scientific and day-2-day problems. This paper reviews the applications of bionanotechnology in nanomedicine because; it is one of the mostly studied applications of nanotechnology, which is in biomedical sciences. Various areas such as drug development, drug production, drug delivery, and clinical diagnostics are analysed in the paper. The review paper highlights the relevance of nanotechnogy as an engineering field which is applicable in the field of biology and medicine.