Mechanization and Import Substitution in Zimbabwean Farmers' Equipment: A Case Study of the Revitalization of an Abandoned Tractor Trailer
Drill String Vibrational Analysis and Parametric Optimization for a Portable Water Well Rig Development
An Efficient Deep Neural Network with Amplifying Sine Unit for Nonlinear Oscillatory Systems
The Occupational Directness of Nanorobots in Medical Surgeries
Recent Trends in Solar Thermal Cooling Technologies
Design of Oil-Ammonia Separator for Refrigeration Systems
A Review on Mechanical and Tribological Characteristics of Hybrid Composites
Design and Experimental Investigation of a Natural Draft Improved Biomass Cookstove
Progressive Development of Various Production and Refining Process of Biodiesel
Optimization of Wire-ED Turning Process Parameters by Taguchi-Grey Relational Analysis
Evaluation Of Mechanical Behavior Of Al-Alloy/SiC Metal Matrix Composites With Respect To Their Constituents Using Taguchi Techniques
Multistage Extractive Desulfurization of Liquid Fuel by Ionic Liquids
Isomorphism Identification of Compound Kinematic Chain and Their Mechanism
Development of Electroplating Setup for Plating Abs Plastics
A Comprehensive Review of Biodiesel Application in IDI Engines with Property Improving Additives
Vibration is an ergonomic challenge for tractor drivers in Zimbabwe. A special mini tractor chassis suspension type for towing was designed, and diagrams of simulations of the chassis and suspension were included in this analysis. A design methodology was used that included tools such as reverse engineering, computer-aided engineering software, and finite element analysis. Finite Element Analysis was used to determine the forces that can be attained by the chassis. Material selection was included, and a selected material simulation was performed, which showed favourable results. The chassis is the major component where the engine, gearbox, and all other controls are mounted. The results presented are the structural characteristics of a modern mini tractor chassis attached to suspension leaf springs. Von Mises using Invertor Computer Aided Design (CAD) software was performed to identify critical regions and obtain design modification.
The present study examines the performance of a resistance heating furnace using two different heating elements, Silicon Carbide (SiC) heating rods and Molybdenum Di-Silicide (MoSi2) heating elements, where SiC rods are used first, starting from the beginning (ambience) temperature of 35ᴼC up to 1300ᴼC, followed by MoSi2 heating elements to raise the chamber temperature from 1300ᴼC to the set temperature of 1600ᴼC. To achieve effective insulation results, newage high alumina (Al2O3), very low thermal conductivity (K), and high density materials such as zirconium tiles, mullite tiles, and zirconium modules, all with such necessary insulation properties sandwiched, are used. Air, a bad conductor of heat transfer, is also used in a gap of 20 mm between two different tiles to lessen heat transfer from the working chamber towards the outer ambience by conduction and radiation to achieve desirable results-maximum thermal efficiency with the least heat loss from the outer surface and to achieve skin temperature equal to the ambient temperature. Also, in this experiment, hot-faced red bricks are used under the hearth in a new design. The system under study consists of a programmable Proportional Integral Derivative (PID), a thyristor power pack, recrystallized alumina tubes, and sensing elements: a thermocouple and Pt-Pt/13%. Rh, semiconductor-based circuit that controls power and current. This makes the system to meet the requirement (step down) and thereby controls voltage automatically with a transformer (depending on the size of the working area, 53 A (I), 220 V for single phase, reduced to 60 V by a step down transformer) auto-current-limiting facilities.
Bore hole drilling is a growing activity driven by the need to access important resources like ground water and fossil fuels. In the process, however, undesired vibrations and shocks on the drill strings are invariably experienced, and this has a detrimental impact on the equipment. To get a full understanding of the origins and characteristics of this dysfunction, a generalized lumped-parameter model of the drill string system is studied to provide a deeper understanding of the drillstring dynamics and bit mechanics. The torsional stick-slip vibration phenomenon focuses on analyzing the source of vibration excitation, which is primarily the nonlinear bit-rock fictional interaction. The impact of various parameters such as the weight on the bit, rotational speed, and damping on the severity of vibration, in particular stick-slip vibration, is further analyzed. The simulation results highlight the significance of the key factors for stick-slip onset and severity. These controllable factors can be used to eliminate stick-slip while avoiding other undesirable effects, achieving optimum performance. Further research will be done on multi-stability analysis to define the optimum operation zones and design of vibration reduction tools and control strategies.
In the past decade, revolutionary innovations in allied technology have given rise to the design and construction of ubiquitous mechatronic systems for different domains of industrial applications. The process and manufacturing industries have a lot of areas that are hazardous to direct human interaction. Therefore, development of a wirelessly controlled robotic arm akin to human skills is urgently needed in industrial applications. Further, the deployment of the Arduino Uno microcontroller platform has very promising features for designing mechatronic systems. So, it is proposed to develop a wirelessly controlled robotic arm. In this proposed article, a robot arm having the ability to move in four directions (up, down, left, and right) has been constructed. This controlled mobility is achieved with the help of a 4-DOF (Degree of Freedom) design deploying two types of servo motors, the SG90 and the MG996R. The Bluetooth module, HC- 05, is interfaced to achieve wireless communication. These devices are wired around the powerful electronic platform "Arduino Uno microcontroller," and an Android-based application is deployed on a smart phone to control this robotic arm wirelessly. The prototype of the Wireless Robotic Arm (WRA) is designed and developed successfully in the laboratory for industrial applications, pick-and-place operations, and it works smoothly and has good repeatability.
Drill String (DS) vibrations are excessive and cause early failure of various parts of the drill string due to fatigue. A drill string is a part of the rig bottom that consists of drill pipe, a drill collar, and a bit. The more the drill pipes are connected, the longer the drill string. The phenomenon caused by drill string vibrations can be avoided by stopping the drill string to rotate or move at its natural frequency, or, in other words, to avoid resonance. Rotational Speed (RS) in the drill string causes lateral vibrations and stick-slip in torsional vibrations. This research investigates vibration under the action of parameters such as water well drill string lengths and rotational speeds. A drill string was finite element modelled in the Analysis of Systems (ANSYS) workbench 2020, mechanical. The Campbell diagram was used to analyze critical speeds, Backward Whirl (BW), and Forward Whirl (FW) and drill string length.
