Journal Publications

The Autonomous Vibration Monitoring Robot (AVMR) was developed to enhance predictive maintenance of industrial equipment, with a focus on boiler feed pumps at the Egbin power plant. The system is designed as a mobile robot capable of autonomously detecting and analyzing mechanical vibrations for early fault identification and reduced unplanned downtime. The AVMR integrates an ADXL345 three-axis accelerometer mounted on a 3-degree-of-freedom robotic arm for direct vibration measurement, alongside an HC-SR04 ultrasonic sensor for obstacle detection and safe navigation. Vibration signals are acquired in real time and processed using a Fast Fourier Transform (FFT) algorithm implemented on an ESP32 microcontroller, enabling conversion of time-domain data into frequency-domain information for identification of dominant vibration components. Peak acceleration values along the X, Y, and Z axes are continuously monitored against predefined thresholds, triggering an alert when exceeded. The prototype system employs L298N motor drivers for four-wheel locomotion and MG996R servo motors for arm articulation, with control implemented in C++ using the Arduino framework. Experimental evaluation on a laboratory hydraulic pump identified dominant frequencies of 32, 41 and 60 Hz under normal, minor imbalance and fault conditions respectively. The system consistently detected vibration amplitudes exceeding the 700-unit threshold and triggered automatic alerts without false alarms during repeated laboratory trials. The AVMR offers a low-cost and scalable solution for automated vibration monitoring, reducing reliance on manual inspection while supporting early fault detection. Its application can be extended to broader industrial systems, including marine and coastal energy infrastructure, thereby contributing to sustainable and resilient operations.

This study evaluates blended mahogany and avocado seed oils as sustainable alternatives to mineral oil-based cutting fluids for machining of difficult-to cut stainless steel. The oils were extracted, characterized, and formulated into emulsions using a full factorial design (L₁₆(2⁴)) with selected additives. Physicochemical results showed that mahogany oil had a higher yield (59%) and lower specific gravity (0.893) compared to avocado oil (26%, 0.934), while both were liquid at room temperature with pH values of 8.01 and 7.33, respectively. FT-IR and GC–MS analyses confirmed fatty acid methyl esters and unsaturated fatty acids, with methyl stearate (16.57%) dominant in mahogany oil and methyl oleate (19.34%) in avocado oil, indicating strong lubricating and biodegradable potential. Also, lubricity tests showed that avocado oil had better cold-flow and thermal stability, with lower cloud (6°C) and pour points (2°C) compared to mahogany oil (9°C and 12°C), and higher flash (213°C) and fire points (185°C) than mahogany oil (178°C and 170°C). Theerefore, the study confirms that mahogany and avocado oils are viable biodegradable oils for cutting fluids formulation

This study evaluates blended mahogany and avocado seed oils as sustainable alternatives to mineral oil-based cutting fluids for machining of difficult-to cut stainless steel. The oils were extracted, characterized, and formulated into emulsions using a full factorial design (L₁₆(2⁴)) with selected additives. Physicochemical results showed that mahogany oil had a higher yield (59%) and lower specific gravity (0.893) compared to avocado oil (26%, 0.934), while both were liquid at room temperature with pH values of 8.01 and 7.33, respectively. FT-IR and GC–MS analyses confirmed fatty acid methyl esters and unsaturated fatty acids, with methyl stearate (16.57%) dominant in mahogany oil and methyl oleate (19.34%) in avocado oil, indicating strong lubricating and biodegradable potential. Also, lubricity tests showed that avocado oil had better cold-flow and thermal stability, with lower cloud (6°C) and pour points (2°C) compared to mahogany oil (9°C and 12°C), and higher flash (213°C) and fire points (185°C) than mahogany oil (178°C and 170°C). Theerefore, the study confirms that mahogany and avocado oils are viable biodegradable oils for cutting fluids formulation