Static force, excitation frequency and excitation amplitude are the main three main control parameters. This is my great opportunity to work on this project and I am happy to express my highest thanks to my FYP supervisor, Dr. To Setyamartani Parman, who sincerely guided and coached me during these two semesters. I would like to take this opportunity to express my gratitude to my supervisor for giving me the opportunity and contributing to my self-development with his constant motivation until the end of the project.
Tamiru Alemu on behalf of giving proper comments to improve my project and giving ideas to ensure that my project is complete and verified in both Final Year Project 1 and 2. Not to forget, I would especially like to thank my family for their support in everything in terms of morale and motivation during the ups and downs of this project and without their concern and faith, I would not be able to perform well. Finally, the last gratitude will go to my friends of May 2011 Mechanical Batch who have been with me through my tough times during my undergraduate studies here.
INTRODUCTION
PROBLEM STATEMEN T
The invention of vibration drilling has been an important study to research in the upstream field. This study has been done to come up with different modes of modeling for the vibration drilling systems in terms of impact, such as the three-mass model. However, this model works according to system response analysis such as optimal load parameters and control parameters.
Therefore, in terms of these parameters, research and research should be done to confirm the rate of progress of the drilling system in the chosen model. From the completion of this research, we should be able to develop mathematical models in terms of equation of motion.
OBJECTIVES
SCOPE OF STUDY
LITERATURE R EVIEW
With the proper equipment of a hydraulic lift table, the experiment with the drill was stopped and the experiment was performed to rotate and push the block upwards. More use is made of the percussive action compared to the double penetration rate generated by the static weight of bits performed for the experiment. On the other hand, the results were presented by (Smith & Kopczynksi, 1961), who also interpreted that air rotary percussion drilling is an important tool in the industry and additional improvement and optimization is needed (Smith & Kopczynksi, 1961).
The chances of improving the utilization of the energy for the drill rock by the downhole operation, which will be subject as the geometric constraint, as each rock has a less favorable loading geometry compared to differential (Simon, Energy balance in rock drilling, 1963). The research on the new model of the progression phase of buoyant impact oscillation was advanced to elasto-plastic solids using the impactor. The calculation of the dynamic analysis of the system is for the mass of the contact area of the impact oreometry.
Conducting numerical studies and experiments on operation of resonant hammer drilling model, which illustrates that the behavior of the system can fluctuate significantly from normal periodic systems to chaos by (Franca, A bit-rock interaction model for rotary-percussive drilling, 2011). On the other hand, the studies of percussive ultrasonic drilling with diamond-shaped tools on the rock were performed in the laboratory (Wiercigroch, Wojewoda, & Krivtsov, 2005). The paper has shown that the modeling of the mathematical and its analysis from the task.
The main point for this project is to relate the modifiable high-frequency dynamic strain that will arise from the axial oscillation. Because the bits are supplied by a hydraulic cylinder, they are separated from the rotary motion of the sample provided by the vertical slat and turntable. This is to preserve the combined rotary impact action exerted on the rock or drill bit by the aforementioned arrangement, which allows for the simplification of rig instrumentation.
There will be parameters for external force as well on the system to show the typical behavior of the investigated system.
METHODOLOGY/PROJECT WORK
- MATLAB®
- RESEARCH METHODOLO GY
- KEY MILESTONE
- FLOW CHART
- GANTT CHART
For the Final Year Project 1 (FYP 1), there will be more to understand the concept of vibro impact drilling and its parameters. Not to forget, the calculation is also required to derive the mathematical modeling before the title of the project. Thus, the modeling of the equation of motion including all parameters or state will be done with the guidance of research papers.
According to the equation, there will be movement sequence after the phases such as progression, when the slider and the mass are in contact, contact without progression, no contact and how the progressions are affected by the control parameters. When the computer simulation is finished, the calculation results will be compared to prove the research of this project and followed by its interpretation of the results accordingly. During the Final Year Project 2 (FYP 2), the familiarization of software will take place through exercises in MATLAB software.
As mentioned in Figure 3.2, an organized procedure must be produced to successfully complete the tasks and achieve the project objectives within the given time period. This is to make sure that to get a clearer view and understanding about the project faster, as follow-ups with the project supervisor are established every now and then to update the progress and the explanation when problems arise. This is an important part of the whole project as wrong problem identification of problem can lead to changed final outcome of the project.
Based on the project identified, the project objectives are set and the scope of work will be more specific in order to accommodate the constraints that may hinder the likelihood of completing this project. Intense research into Vibro impact drilling has been carried out to produce the computer coding that will be able to stimulate the drill dynamic characteristics as close and exact as its actual behavior. The development of the computer code in MATLAB software is started once the project supervisor validates and verifies the derivation of the equation of motion.
Once validation is done, stimulation is performed later and a stimulation graph is generated as the results of this project.
RESULTS AND DISCUSSION
THREE MASS MO DEL MATHEMATICAL MODELLING
The drill bits are modeled by a mass M1, which is placed at a distance of G from the rock surface. From the small contact forces, the spring stiffness, K1 and the damper damping coefficient, C1 shows the elastic behavior of the rock. Since the drill head and the rock block are not in contact, the contact force, Pc, and the velocity are zero.
During the process of free movement, the surface rock, Xt in the forces of the spring, K1 and the damper C1. The value of the initial gap, G will be evaluated when the drill head contacts the rock, displacement X1. The upper mass M3 is designed based on the equivalent oscillating mass of the frame and compared with the associated mass of the exciter M2 with a spring constant K3 and a damping coefficient C3.
The mass of the exciter, M2 is connected to the drill parts through the spring constant, K2 and the damping coefficient of C2. However, the lower mass, M1 is the drill bit and its three different stages of operation depend on its point in relation to the rock surface, Xt. The final stage where the contact force Pc exceeds the threshold Pr, followed by the third stage.
If the contact force Pc falls below zero, the contacts stop and the first step begins. The slider moves under the combined force of the opposing force Pr and the spring between the slider and the rock surface Xt. Since the mass is zero, the contact force Pc is equal to the resistance force Pr.
SIMULATIONS
- Graph Plots Results
- Dynamic system for Excitation force, F o variation with Time
First, the parameters are identified and the high frequency is obtained and compared with the mathematical model cited by (Jasem & Ahmet, 2014). Study of the dynamic behavior of the three mass model to determine the effect of control parameters such as static force, frequency excitation and amplitude excitation e. This is shown by the graph above, as omega decreases in value, the speed of the graph drill bit decreases, which leads to higher vibration limits in the drill bit.
Analyzing the graph above, Figure 4.4(b) shows a higher drilling speed at 500 seconds compared to Figure 4.4(a). This clearly shows that the higher the omega value (Ω), the higher the speed of the drill, resulting in a higher advance rate. Referring to Figure 4-5, the RED module speed graph explains the resonance-enhanced speed of the drilling module decreasing dramatically in the first 210 seconds.
However, the speed of the module continues to increase dramatically until the speed reaches 3m/s and the speed gradually decreases. For the equivalent frame velocity versus time graph, the velocity of the equivalent frame shows a constant increase with time. Based on Figure 4.7, there was no sign of velocity response at rock surface for the first 20 seconds and the progression of rock surface removal velocity is observed with time.
When the impact was on the RED module and the surface, the graph of the results shows that the speed was very low, as can be seen in the first 200 seconds. A table was constructed for excitation force versus time domain to encounter the variation of excitation amplitude results obtained from the plot generated using MATLAB software. However, the purpose of this analysis is to obtain the optimal parameters that have the maximum impact force affected by the excitation force and increase the advance rate.
Despite the high excitation force and the impact, a chaotic situation can arise, as long as the main goal of determining the optimal parameters is achieved.
CONCLUSION AND RECOMMENDATION
CONCLUSION
RECOMMENDATION
