scholarly journals Positioning Control of DC Servomotor-Based Antenna Using PID Tuned Compensator

2021 ◽  
Vol 8 (1) ◽  
pp. E9-E16
Author(s):  
P.C. Eze ◽  
C.A. Ugoh ◽  
D.S. Inaibo
Keyword(s):  
Time Domain ◽  
Position Control ◽  
Settling Time ◽  
Step Response ◽  
Peak Time ◽  
Performance Parameters ◽  
Input Disturbance ◽  
Response Performance ◽  
Time Domain Response ◽  
Dc Servomotor

Direct current (DC) servomotor-based parabolic antenna is automatically positioned using control technique to track satellite by maintaining the desired line of sight for quality transmission and reception of electromagnetic wave signals in telecommunication and broadcast applications. With several techniques proposed in the literature for parabolic antenna position control, there is still a need to improve the tracking error and robustness of the control system in the presence of disturbance. This paper has presented positioning control of DC servomotor-based antenna using proportional-integral-derivative (PID) tuned compensator (TC). The compensator was designed using the control and estimation tool manager (CETM) of MATLAB based on the PID tuning design method using robust response time tuning technique with interactive (adjustable performance and robustness) design mode at a bandwidth of 40.3 rad/s. The compensator was added to the position control loop of the DC servomotor–based satellite antenna system. Simulations were carried out in a MATLAB environment for four separate cases by applying unit forced input to examine the various step responses. In the first and second cases, simulations were conducted without the compensator (PID TC) in the control loop assuming zero input disturbance and unit input disturbance. The results obtained in terms of time-domain response parameters showed that with the introduction of unit disturbance, the rise time improved by 36 % (0.525–0.336 s) while the peak time, peak percentage overshoot, and settling time deteriorate by 16.3 % (1.29–1.50 s), 43.5 % (34.7–49.8 %), and 7.6 % (4.35–4.68 s), respectively. With the introduction of the PIDTC for the third case, there was an improvement in the system’s overall transient response performance parameters. Thus to provide further information on the improved performance offered by the compensator, the analysis was done in percentage improvement. Considering the compensated system assuming zero disturbance, the time-domain response performance parameters of the system improved by 94.1, 94.7, 73.1, and 97.1 % in terms of rising time (525–30.8 ms), peak time (1,290–67.9 ms), peak percentage overshoot (34.7–9.35 %), and settling time (4.35–0.124 s), respectively. In the fourth case, the compensator’s ability to provide robust performance in the presence of disturbance was examined by comparing the step response performance parameters of the uncompensated system with unit input disturbance to the step response performance parameters of the compensated system tagged: with PID TC + unit disturbance. The result shows that PID TC provided improved time-domain transient response performance of the disturbance handling of the system by 91.0, 95.4, 80.0, and 93.1 % in terms of rising time (336–30.5 ms), peak time (1500–69.1 ms), peak percentage overshoot (34.7–10.0), and settling time (4.68–0.325 s), respectively. The designed compensator provided improved robust and tracking performance while meeting the specified time-domain performance parameters in the presence of disturbance.

Computation of the time‐domain response of a polarizable ground

Geophysics ◽  
1982 ◽  
Vol 47 (11) ◽  
pp. 1574-1576 ◽  
Author(s):  
D. Guptasarma
Keyword(s):  
Time Domain ◽  
Complex Impedance ◽  
Fractional Power ◽  
Domain Model ◽  
Frequency Function ◽  
Step Response ◽  
Linear Filter ◽  
Complex Frequency ◽  
Time Domain Response ◽  
Impedance Functions

Computation of the theoretical time‐domain response of a polarizable ground on the basis of a frequency‐domain model of relaxation, e.g., a Cole‐Cole or any other model that involves a fractional power of the complex frequency variable, runs into difficulties either because the Laplace transform can only be written as a very slowly converging summation or because it cannot be written in closed computable form. A clear way around this is to use a digital linear filter. A filter is presented in this paper that has been designed specifically to work well with complex impedance functions that tend asymptotically to real values at both extremes of the frequency variable, the magnitude descending monotonically from the low‐frequency asymptote to the high frequency asymptote. This filter produces the step response from the real part of the impedance‐versus‐frequency function with reasonable accuracy for all impedance functions that one may like to represent by models of electrical relaxation for a polarizable ground, but it does not work for functions containing sharp resonances or discontinuities.

scholarly journals Comparison and Speed Control of DC Motor and DC Servomotor Using IMC Based PID Controller

2021 ◽  
Vol 6 (12) ◽  
pp. 493-501
Author(s):  
Amarapini Divya and Dr.Prasadarao Bobbili
Keyword(s):  
Time Domain ◽  
Rise Time ◽  
Pid Controller ◽  
Speed Control ◽  
Dc Motor ◽  
Settling Time ◽  
Peak Amplitude ◽  
Pid Controllers ◽  
Frequency Method ◽  
Dc Servomotor

IMC based PID controllers are being used to speed control of DC motor and DC servomotor in industry. As this controller offer good performance comparitive to conventional controllers like PI, PID and Ziegler Nichols frequency method controllers. This paper presents the speed control of the DC motor and DC servomotor using PI, PID, Ziegler Nichols method and IMC-PID controllers, to realize the optimization of control action. A mathematical calculation of DC motor and DC servomotor has developed and simulations are carried out in MATLAB/ Simulink environment. From the results, it is observed that time domain parameters like rise time 0.6 secs, settling time 2 secs, speed for peak over shoot 1450, peak amplitude 1, with no oscillations using IMC-PID controller on DC motor. And for DC servomotor its rise time is 0.3 seconds, settling time is 1 second, speed for peak overshoot 1450 rpm, peak amplitude 1 with absence of oscillations by using IMC-PID controller

scholarly journals Current mode proportional resonant controlled multi input–SEPIC-re-boost-system

2019 ◽  
Vol 10 (2) ◽  
pp. 682
Author(s):  
B. Jagadish Kumar ◽  
Basavaraja Banakara
Keyword(s):  
Time Domain ◽  
Closed Loop ◽  
Current Mode ◽  
High Gain ◽  
Peak Time ◽  
Motor Speed ◽  
Loop Control ◽  
Multiple Input ◽  
Simulation Results ◽  
Time Domain Response

<p>The intention of this paper is to identify a suitable controller for closed loop multi converter system for multiple input sources and to improve time response of high-gain-step up-converter. Closed-loop Multi Converter System (MCS) is utilized to regulate load-voltage.  This effort recommends suitable-controller for closed-two loop-controlled-SEPIC-REBOOST Converter fed DC motor. The estimation of the yield in open-two loop and closed- two-loop-circuit has been done using MATLAB or Simulink. Closed-two loop-control of Multi Converter System with Propotional+Integral (PI)- Propotional+Integral (PI) and Proportional+Resonant (PR) - Proportional+Resonant (PR) Controllers are investigated and their responses are evaluated in conditions of rise time, peak time, settling time and steady state error. It is seen that current-mode PR-PR controlled MCS gives better time domain response in terms of motor speed. A Prototype of MCS has been fabricated in the laboratory and the experimental-results are authenticated with the simulation-results.</p>

Discuss about Fast Response Performance of under-Damped Second-Order System in Time Domain

2013 ◽  
Vol 655-657 ◽  
pp. 2202-2206
Author(s):  
Yuan Sheng Wang ◽  
Gui Ying Lu ◽  
Juan Yu ◽  
Bo Li
Keyword(s):  
Time Domain ◽  
Input Signal ◽  
Damping Ratio ◽  
Fast Response ◽  
Second Order ◽  
Order System ◽  
Peak Time ◽  
Response Performance ◽  
The Time Domain ◽  
The Relationship

Influence of the damping ratio on the response fast performance to under-damped second-order system in the time domain has been discussed. The relationship between peak time and the input signal, the adjust time, and the system type has been analyzed. The response’s fast performance indicators are relative, and it is related to the input signal, the response of the system, and the type of system and its initial states. In conclusion, the peak time and the adjust time cannot reach a minimum at the same time. The fast response issue must be discussed in relation to specific cases, and it cannot be generalized.

Modeling some empirical vertical component Lg relations

1983 ◽  
Vol 73 (1) ◽  
pp. 157-171
Author(s):  
Robert B. Herrmann ◽  
Andrzej Kijko
Keyword(s):  
Time Domain ◽  
Scaling Laws ◽  
Vertical Component ◽  
Wave Theory ◽  
Eastern North America ◽  
Peak Time ◽  
Coda Q ◽  
Crustal Model ◽  
Lg Wave ◽  
Spatial Attenuation

abstract Higher mode surface wave theory is used to model the vertical component Lg wave observed in eastern North America at regional distances. Tests of the model are made to determine whether it is capable of describing empirical spectral scaling laws, spatial attenuation, and peak time domain Lg amplitudes. It is found that a simple crustal model and a rough estimate of crustal Qβ are all that are required to accomplish this. Good results are obtained if the average crustal Qβ is equated to the coda Q of the same frequency.

scholarly journals Time-domain response of atomically thin MoS2 nanomechanical resonators

2014 ◽  
Vol 105 (4) ◽  
pp. 041911 ◽  
Author(s):  
R. van Leeuwen ◽  
A. Castellanos-Gomez ◽  
G. A. Steele ◽  
H. S. J. van der Zant ◽  
W. J. Venstra
Keyword(s):  
Time Domain ◽  
Nanomechanical Resonators ◽  
Time Domain Response

The quantitative advantages of using B-field sensors in time-domain EM measurement for mineral exploration and unexploded ordnance search

Geophysics ◽  
2012 ◽  
Vol 77 (4) ◽  
pp. WB137-WB148 ◽  
Author(s):  
Michael W. Asten ◽  
Andrew C. Duncan
Keyword(s):  
Impulse Response ◽  
Time Constant ◽  
Exponential Decay ◽  
Time Domain ◽  
Step Response ◽  
Late Time ◽  
Additional Parameter ◽  
Unexploded Ordnance ◽  
Response Measurement ◽  
Response Systems

The use of simple models for decay of conductive targets under conductive overburden and for the decay of magnetically permeable conductive steel objects allows quantitative consideration of the advantages of the use of magnetic-field detectors in time-domain electromagnetic (TEM) measurements, or more generally, the advantage of step response over impulse response TEM systems. We identified eight advantages of the step response versus impulse-response systems. The first two advantages relate to the inductive limit (early time) decay behavior, in which a target response amplitude is largely dependent on geometrical rather than conductivity parameters. Five further advantages occur when measuring response of a target in a conductive host or under conductive overburden; the maximum target-to-overburden response occurs 25%–30% earlier in time, the earliest target detection time occurs a factor 2–4 earlier, and the amplitude advantage of target-to-overburden response is a factor in the range of 1–10 for the step versus impulse-response systems, respectively. These advantages agree quantitatively with field observations on a chalcopyrite orebody under conductive cover. We used a model response for a conductive permeable sphere to derive mathematically consistent approximations for the power-law and exponential decay behaviors for step and impulse responses of metal objects, from which the onset of late-time exponential decay of EM responses of unexploded ordnance occurs about a factor of two earlier in time for the step response. This earlier-time transition together with the higher signal-to-noise ratio available from the step-response measurement makes measurement of the fundamental time-constant of unexploded ordnance (UXO) possible for medium and large UXO where the time constant is in the range of tens of milliseconds. This time-constant thus becomes accessible as an additional parameter for UXO characterization and discrimination.

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