The Approach for Analyzing Motion Mode of High-Order Control Systems

2014 ◽  
Vol 596 ◽  
pp. 594-597
Author(s):  
Sheng Guo Zhang ◽  
Kai Wang ◽  
Xiao Ping Dang
Keyword(s):  
Control System ◽  
Modal Analysis ◽  
Control Systems ◽  
High Order ◽  
Step Response ◽  
Space Theory ◽  
Analysis Method ◽  
Inverse Laplace Transformation ◽  
State Space Theory ◽  
Motion Mode

This paper aims at exploring the modal analysis approach of a motion control system. Based on the inverse Laplace transformation, the step response of a control system is derived. Then this response is associated with the modal analyses in state space theory. And then the motion mode of a control system is analyzed with the modal analysis method. Application example indicates that this approach can be used to analyze the high-order control system successfully. This facilitates the motion mode analyses of high-order control system very much.

scholarly journals Effects of Plant Identification on the Generalized Predictive Controllers Design

2016 ◽  
Vol 14 (4) ◽  
pp. 2-10
Author(s):  
E. Garipov
Keyword(s):  
Control System ◽  
System Identification ◽  
Control Systems ◽  
Discrete Time ◽  
Optimization Procedure ◽  
Step Response ◽  
Plant Identification ◽  
Plant Characteristic ◽  
Predictive Controllers ◽  
Discrete Time Models

Abstract The effects of the estmated plant models accuracy on the control system signals quality after generalized predictive controllers design are studied in the paper. Two identification approaches are used for different in structures discrete-time models – by optimization procedure in Optimization Toolbox based on the plant step response as a standard deterministic plant characteristic and by functions in System Identification Toolbox after experiments with random signals on the plant. The generalized predictive controllers are design according to the estimated models. The processes in the simulated control systems are analyzed concerning the effects of different kind plant models on the designed controllers.

scholarly journals APPLICATION OF TEMPERATURE CONTROL SYSTEMS AT THE CATALYST ACTIVATION STEP IN THE METHANOL TESTPLANT

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Arya Bhaskara Adiprabowo ◽  
Astri Pertiwi ◽  
Nurdiah Rahmawati ◽  
Frendy Rian Saputro ◽  
Novio Valentino ◽  
...  
Keyword(s):  
Control System ◽  
Control Systems ◽  
Temperature Control ◽  
Active Sites ◽  
Reduction Process ◽  
Step Response ◽  
Temperature Control System ◽  
Synthesis Process ◽  
Catalyst Activation ◽  
Temperature Controller

Catalyst activation is an important step in methanol synthesis process, achieved by the reduction of CuO precursor producing Cu0 active sites.  Testplant’s temperature operation shall be maintainted at 220°C in order to maximize the CuO reduction process in the catalyst activation step. A temperature control system shall be applied in methanol testplant to maintain the temperature during reduction process, due to sensitivity of reduction process to temperature variation and possibility of disturbance such as change in gas flow rate which could affects the operating temperature. Temperature control systems are tested by using step response at the desired setpoint, which is 220°C at pre-heater and reactor and 60°C at sampling line. The tests are conducted by changing the setpoint value at temperature controller and previously stable flow gas in the system (disturbance rejection). The temperature control system proved to be able to response well during the test. In the end, methanol is produced from syngas, indicating catalyst activation success. Keywords: Catalyst Activation; Methanol Testplant; Temperature Controller

scholarly journals Stress Response and Damage Characteristics of Local Members of a Structure due to Tunnel Blasting Vibrations Based on the High-Order Local Modal Analysis

2019 ◽  
Vol 2019 ◽  
pp. 1-18
Author(s):  
Xiaoming Guan ◽  
Chunwei Zhang ◽  
Fei Zhao ◽  
Ben Mou ◽  
Yiming Ge
Keyword(s):  
Modal Analysis ◽  
Natural Frequencies ◽  
High Order ◽  
Response Analysis ◽  
Finite Element Models ◽  
Main Body ◽  
Masonry Building ◽  
Analysis Method ◽  
Tunnel Blasting ◽  
Global Modes

Damage characteristics and dynamic stress response of aging masonry structures for blast-induced ground motion were performed using high-order local modal analysis method. A complete investigation of damage types and locations of aging masonry buildings due to tunnel blasting vibration were performed by on-site survey. A typical 2-storey aging masonry building located above a tunnel was selected for dynamic response analysis. The experimental dynamic characteristics of the structure were determined by using the operational modal analysis (OMA) method. Finite element models for the masonry structures were updated by modifying material parameters based on OMA results. The first five natural frequencies of the updated finite element models ranged from 8.80–24.99 Hz, and the first five modes were global modes. The sixth to twentieth natural frequencies ranged from 26.10–36.34 Hz, and the sixth to twentieth modes were local modes whose deformation was greater than the global deformation. Since the principal frequencies of the tunnel blast vibration were mostly higher than the natural global modes’ frequencies and were much closer to the natural frequencies of local members, local members experienced more intensive vibrations compared to the main body structure. The principal compressive stress (PCS) and principal tensile stress (PTS) of local members were several times greater than that of the main body structure. Therefore, local members of the masonry building suffered most from the tunnel blasting vibration. Corners due to stress concentration, the contact area between brick and concrete, local members, and precast floor seams are prone to damage during tunnel blasting. With the vibration velocity increasing, the PCS and PTS of local members gradually increase. But, the PTS ratio of local members decreases with the increase of peak particle velocities. The dynamic response analysis result and the damage locations using high-order local modal analysis method are in accordance with the damage found at the site.

scholarly journals Some aspects of controlling radiant and convective cooling systems

2019 ◽  
Vol 111 ◽  
pp. 05008 ◽  
Author(s):  
Taha Arghand ◽  
Jan-Olof Dalenbäck ◽  
Anders Trüschel ◽  
Saqib Javed
Keyword(s):  
Control System ◽  
Control Systems ◽  
Room Temperature ◽  
Energy Use ◽  
Cooling System ◽  
Pump Energy ◽  
Step Response ◽  
Feedback Signal ◽  
Cooling Systems ◽  
Heating And Cooling

Designing appropriate control systems for radiant heating and cooling terminals entails an understanding of their dynamic behaviour. This study experimentally investigates the dynamic response of a room with convective and radiant cooling systems. The experiments were performed in a 12.6 m2 large test room outfitted as a single-office room. The main cooling system was radiant ceiling panels which covered 70% of the ceiling area. The thermal performance of the radiant system was compared to that of a fan-coil unit (FCU). The results from the step response test showed that the time constant of the room for the radiant system was shorter than for the convective one, indicating faster changes in room temperature by the radiant system. Furthermore, controlling the FCU with similar control system tuned for ceiling panels increased the hysteresis gap in the room air temperature from 0.4 K to 0.8 K. This indicates that control systems for low-mass radiant systems and convective systems might be applied to each other, but on-site tuning is required to omit the offset (persistent error). In this study, controlling room temperature with ceiling panels did not benefit from using an operative temperature sensor to provide feedback signal to the control system. However, the pump energy use was moderately decreased by 14%.

scholarly journals A New Design Method of High-Order Modified Repetitive Control Systems for Reference Inputs with Uncertain Period-Time

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Zhongxiang Chen ◽  
Kou Yamada ◽  
Tatsuya Sakanushi
Keyword(s):  
Control System ◽  
Control Systems ◽  
Closed Loop ◽  
Design Method ◽  
Repetitive Control ◽  
High Order ◽  
Stabilizing Controllers ◽  
Control Precision ◽  
Free Parameters ◽  
High Control

This paper considers the design of high-order modified repetitive control systems for periodic reference inputs with uncertain period-time. The objective of this work was to develop a new design method so that the closed-loop high-order modified repetitive control system is robustly stable with high control precision for periodic reference inputs with uncertain period-time. The parametrization of all stabilizing controllers containing three free parameters is proposed based on the Youla-Kucera parameterization. Moreover, to obtain the free parameters, the constraint conditions were converted into stability conditions in the form of Bilinear Matrix Inequalities that can be solved using the available software. In addition, the high control precision is guaranteed by designing the free parameters after the control characteristic of this control system. The validity and effectiveness of the proposed design method were verified by numerical examples.

Pengaruh Sistem Pengendalian Internal Pemerintah dan Kompetensi Pegawai Terhadap Kinerja Instansi Pemerintah Kabupaten Karimun

2020 ◽  
Vol 5 (1) ◽  
pp. 101-106
Author(s):  
Doni Putra Utama
Keyword(s):  
Control System ◽  
Control Systems ◽  
Internal Control ◽  
Statistical Tests ◽  
Government Agencies ◽  
Government Performance ◽  
Significant Positive Effect ◽  
Internal Control System ◽  
Employee Competencies ◽  
Positive Effect

This research is a causality study with the title "Effect of Government Internal Control Systems and Employee Competence on the Performance of Government Agencies in Karimun Regency." The purpose of this study was to determine the effect of the implementation of the Government's Internal Control System on the performance of Karimun Regency government agencies and to determine the effect of employee competence on the performance of Karimun Regency government agencies. Data collection using a questionnaire where the questionnaire contained questions about the Government's Internal Control System, employee competencies and agency performance. Data were tested using multiple linear regression statistical tests. Based on the results of the study, it can be concluded that the governmental internal control system has a significant positive effect on Government Agency Performance with the results of statistical tests that show a sig value of 0.016 <0.05 (alpha 5%). Employee Competency has a significant positive effect on Government Performance with the results of statistical tests showing a sig value of 0,000.

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