Mohd Suhairil Meon

Review and current study on new approach using PID Active Force Control (PIDAFC) of twin rotor multi input multi output system (TRMS)

This paper presents initial study of new control PID-Active Force Control (PIDAFC) in controlling twin rotor multi-input multi-output System (TRMS). The objective is to control the TRMS response in order to obey the desired output and rejecting external disturbances. To control the TRMS was challenging since the rotor interact badly at the beam between yaw and pitch. For this reason, it considers as multi input and multi output (MIMO) with nonlinear behavior. The new approach using PID-AFC integrate with neural network and fuzzy logic was proposed to compensate the disturbance occur on TRMS. AFC scheme refer as based controller was used to estimate the disturbance torque while neural network and fuzzy logic act as an optimization device. In initial stage PID-AFC can still be used in minimize the tracking error and rejecting the disturbances. The proposed approach is exhibited through the simulation.

Dynamics characterization of a high precision MM3A micro-manipulator system

This paper presents a study on control architecture improvement of a MM3A microrobotic system (MM3A) in terms of high precision capability using a hybrid control strategy viz. PD control scheme integrated with intelligent Active Force Control (AFC) and Fuzzy Logic (FL). The dynamic model of the MM3A is derived using Recursive Newton-Euler method. The simulation was carried out using MATLAB, Simulink. Three control schemes were utilized in this study namely, proportional-derivative (PD) controller, PD-AFC-Crude Approximation, and PD-AFC-Fuzzy Logic estimator in order to test the system performance and robustness. Based on the simulation results, it is proven that the proposed scheme has outstanding performance compared to the classical control scheme. Using AFC-FL strategy, the MM3A was able to achieve its desired performance excellently. Incorporating neural networks into the system tightens the errors and reduces the time taken for the robot to achieve its desired response.

Effect of Tubes Length and Annealing Temperature on Energy Absorption of Aluminium Alloy Tube 6061-T6 under Inversion Collapse Mode

The purposes of this study are to investigate the effect on variation of the specimens tube length and annealing temperature on the amount of energy absorption of Aluminium tubes (AA 6061) towards inversion collapse mode. The tests were performed on the Aluminium tubes using compression test according to ASTM E8 standard procedure. In this study, a quasi-static inversion tests were conducted in order to obtain the energy absorbed during inversion stages. It was found that the energy absorbed by Aluminium tubes were increased by increasing the tube length but decreased with annealing temperature.

Adaptive active force control application to twin rotor Mimo system

This paper reports a current study on modeling and simulation of adaptive Active Force Control (AFC) based scheme embedded with an artificial neural network (ANN) and/or fuzzy logic (FL) in response manipulations of the twin rotor multi-input multi-output (MIMO) system (TRMS). TRMS is well known for its non-linear behaviour and common classical control scheme such as Proportional-Integral-Derivative (PID) would not be adequate to compensate disturbances. The disturbances in this case were as the results of non-linear external and internal parametric changes, namely angular momentum and couple reactions between the two axes of TRMS. The adaptive control algorithm was proposed in both pitch and yaw to generate an optimum control gain for both responses, simulated viz. MATLAB/SIMULINK software Package. The ANN and FL were integrated into the scheme and act as optimum control algorithm in catalyzing the performance of the TRMS. The results from hybrid conditions of PID-AFC, PID-AFC-ANN and PID-AFC-FL respectively were observed and analyzed. From performance evaluation, PID-AFC-FL scheme has demonstrated a potentially robust and effective manipulating capability in trajectory tracking.

Study on Fatigue Crack Growth of 6065-T4 Aluminium Alloy at Different Stress Ratio

Fatigue crack growth (FCG) rates of compact tension (CT) specimens of Aluminium alloy 6065-T4 were investigated at room temperature and constant amplitude loadings. Standard CT specimens with pre-cracked according to ASTM E647-E11 were subjected to mode I loading with three R-ratio (0.1, 0.3, and 0.5). Paris law has been used to model the stress ratio effect. A stereozoom microscope was used to observe the microstructure changes before and after the tests. The results indicated that the higher the stress ratio value (from 0.1 to 0.5), the faster the FCG rates on CT specimen of AA 6065-T4.

Influence of cutting edge radius in micromachining AISI D2

Chip formation is a dynamic process that is often non linear in nature. A chip may not form when the depth of cut is less than a minimum chip thickness. This paper presents an investigation of cutting edge radius effect on micromachining AISI D2 tool steel via simulation. The chip growth, chip formation and material deformation mechanism was investigated using commercial finite element analysis software. A model is developed with consideration of the arbitrary LagrangianEulerian (ALE) method. The chip growth, chip formation and material deformation was investigate under three criteria such as a/r<1, a/r>1 and a/r=1. The model showed that the chip is formed at a/r >1 while material extrusion performed under a/r<1.

The effect of cross-head velocity and length of tube on energy absorption of aluminium tube

The objective of this study is to investigate the effect of variation of the tube length and the crosshead velocity on the amount of energy absorption of aluminium tubes (Al 6061) towards the inversion collapsed mode. The tests were performed on the Aluminium tubes using compression test apparatus according to ASTM E8 standard procedures. Two parameters that are included in the experiment were the crosshead velocity and tube length. The collected experimental data were organized and analysis of energy absorption was performed. Comparison was made to the values of energy absorption obtained from the experiments, and it was found that the energy absorbed by the Aluminium tube was increased by increasing the tube length as well as crosshead velocity.