Development of an Air Balancer Applying Passive Dynamic Control

2013 ◽  
Vol 25 (4) ◽  
pp. 718-725 ◽  
Author(s):  
Yasuhiro Minamiyama ◽  
◽  
Yuki Gomi ◽  
Takanori Kiyota ◽  
Noboru Sugimoto ◽  
...  
Keyword(s):  
Mechanical System ◽  
Material Handling ◽  
Control Method ◽  
Dynamic Control ◽  
System Control ◽  
Control Performance ◽  
Torque Sensor ◽  
Handling Device ◽  
New Type ◽  
Magneto Rheological

Passive Dynamic Control (PDC) is a new type of mechanical system control method based on inherently safe design. It uses passive elements (braking effort) with variable characteristics positively. In this paper, PDC is applied to a material handling device, and a PDC air balancer is developed using a Magneto-Rheological (MR) brake and a torque sensor. Its control performance depends on the operation of the MR brake, not on the operation of air pressure. Compared with similar conventional devices, PDC air balancer is used with heavy objects for intuitive operation with lower highly-safe actuating force.

Inherently Safe Design of Home Elevator System by Passive Dynamic Control

2007 ◽  
Author(s):  
Y. Minamiyama ◽  
T. Kiyota ◽  
N. Sugimoto
Keyword(s):  
Control Method ◽  
Dynamic Control ◽  
Control Process ◽  
Constant Load ◽  
System Control ◽  
Cost Performance ◽  
Remote Areas ◽  
Power Failure ◽  
Constant Tension ◽  
Small Force

The passive dynamic control (“PDC”) is a new mechanical system control method requiring less energy but ensuring higher safety, which is based on inherently safe design using variable passive elements. The PDC divides its control process into four steps: hold step, take-over step, unbalance step and free step. In each of these steps, it is confirmed that the next step has satisfied the inherently safe design and then the execution of the next step is permitted. In this study, the authors have developed a PDC balancer equipped with a constant-load spring balancer to provide a constant tension regardless of the wire elongation, and conducted positioning experiments using this PDC balancer. This paper proposes a new home elevator system using the PDC balancer. When the balance of the elevator is maintained by using the PDC balancer, the elevator can be moved by a small force. Even if power failure occurs or severance is caused to the spring of the PDC balancer, as long as the cage of the elevator is so mechanically arranged as to ascend in such case, impact on the passengers will be mitigated to be smaller than impact when it descends. Furthermore, this elevator is so designed as to prevent the passengers from being confined in the cage. The inherently safe design can be realized by multiplying the spring structure and employing the PDC for this system. This system is featured by its excellence in safety, energy saving and cost performance. If this system is realized, the home elevator can be used even in remote areas, which is expected to facilitate the spread of the home elevator.

scholarly journals Dynamic Performance Assessment of Primary Frequency Modulation for a Power Control System Based on MATLAB

Processes ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 11 ◽  
Author(s):  
Shizhe Li ◽  
Yinsong Wang
Keyword(s):  
Control System ◽  
Performance Assessment ◽  
Internal Model ◽  
Control Method ◽  
Dynamic Performance ◽  
Dynamic Control ◽  
Pi Control ◽  
Control Performance ◽  
Assessment Index ◽  
Primary Frequency

The primary frequency modulation (PFM) performance of a power control system (PCS) is an important factor affecting the security and stability of a power grid. The traditional control method is proportional integral (PI) control. In order to improve its dynamic control performance, a control method based on the combination of internal model control (IMC) and PI is proposed. Using the method of theoretical assessment and system identification, a simple simulated model of the typical PCS is established. According to the principle of system identification and the least square estimation (LSE) algorithm, the mathematical models of a generator and a built-in model are established. According to the four dynamic performance indexes, the main and auxiliary assessment index of the PCS are defined, and the benchmark and the result of the performance assessment are given. According to three different structures, the PFM dynamic performance of the PCS is analyzed separately. According to the dynamic performance assessment index of PFM, the structure of the control system and the influence of different parameters on the performance of the PCS are analyzed under ideal conditions. The appropriate control structure and controller parameters are determined. Secondly, under the non-ideal condition, the influence of the actual valve flow coefficient on the performance of the control system is studied under two different valve control modes. The simulation results show that the internal model combined with PI has better dynamic control performance and stronger robustness than the traditional PI control, and it also has better application prospects for thermal power plants.

scholarly journals Electromagnetic Actuator System Using Witty Control System

Actuators ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 65
Author(s):  
Der-Fa Chen ◽  
Shen-Pao-Chi Chiu ◽  
An-Bang Cheng ◽  
Jung-Chu Ting
Keyword(s):  
Control System ◽  
Control Method ◽  
Search Algorithm ◽  
Electromagnetic Actuator ◽  
Control Performance ◽  
Learning Capability ◽  
Learning Rates ◽  
Agricultural Applications ◽  
Actuator System ◽  
Rice Milling

Electromagnetic actuator systems composed of an induction servo motor (ISM) drive system and a rice milling machine system have widely been used in agricultural applications. In order to achieve a finer control performance, a witty control system using a revised recurrent Jacobi polynomial neural network (RRJPNN) control and two remunerated controls with an altered bat search algorithm (ABSA) method is proposed to control electromagnetic actuator systems. The witty control system with finer learning capability can fulfill the RRJPNN control, which involves an attunement law, two remunerated controls, which have two evaluation laws, and a dominator control. Based on the Lyapunov stability principle, the attunement law in the RRJPNN control and two evaluation laws in the two remunerated controls are derived. Moreover, the ABSA method can acquire the adjustable learning rates to quicken convergence of weights. Finally, the proposed control method exhibits a finer control performance that is confirmed by experimental results.

Controlling chemical dosing for sulfide mitigation in sewer networks using a hybrid automata control strategy

2013 ◽  
Vol 68 (12) ◽  
pp. 2584-2590 ◽  
Author(s):  
Yiqi Liu ◽  
Ramon Ganigué ◽  
Keshab Sharma ◽  
Zhiguo Yuan
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Biological Processes ◽  
Control Performance ◽  
Hybrid Automata ◽  
Sewer Pipe ◽  
Physical Chemical ◽  
Iron Salts ◽  
Pumping Stations ◽  
Sewer Networks

Chemicals such as magnesium hydroxide (Mg(OH)2) and iron salts are widely used to control sulfide-induced corrosion in sewer networks composed of interconnected sewer pipe lines and pumping stations. Chemical dosing control is usually non-automatic and based on experience, thus often resulting in sewage reaching the discharge point receiving inadequate or even no chemical dosing. Moreover, intermittent operation of pumping stations makes traditional control theory inadequate. A hybrid automata-based (HA-based) control method is proposed in this paper to coordinate sewage pumping station operations by considering their states, thereby ensuring suitable chemical concentrations in the network discharge. The performance of the proposed control method was validated through a simulation study of a real sewer network using real sewage flow data. The physical, chemical and biological processes were simulated using the well-established SeweX model. The results suggested that the HA-based control strategy significantly improved chemical dosing control performance and sulfide mitigation in sewer networks, compared to the current common practice.

Robust Control Method Based on Machine Learning for Boiler Combustion System

2014 ◽  
Vol 685 ◽  
pp. 368-372 ◽  
Author(s):  
Hao Zhang ◽  
Ya Jie Zhang ◽  
Yan Gu Zhang
Keyword(s):  
Robust Control ◽  
Intelligent Control ◽  
Pid Control ◽  
Control Algorithm ◽  
Control Method ◽  
Support Vector ◽  
Control Performance ◽  
Fuzzy Pid Control ◽  
On Line ◽  
Control Output

In this study, we presented a boiler combustion robust control method under load changes based on the least squares support vector machine, PID parameters are on-line adjusted and identified by LSSVM, optimum control output is obtained. The simulation result shows control performance of the intelligent control algorithm is superior to traditional control algorithm and fuzzy PID control algorithm, the study provides a new control method for strong non-linear boiler combustion control system.

Research on a New Type of Lithium Battery String Equalization and Management System

2011 ◽  
Vol 383-390 ◽  
pp. 1470-1476
Author(s):  
Hao Wang ◽  
Ding Guo Shao ◽  
Lu Xu
Keyword(s):  
Lithium Batteries ◽  
Management System ◽  
Lithium Battery ◽  
Large Scale ◽  
Control Method ◽  
Balance Control ◽  
Industrial Applications ◽  
Control Technique ◽  
New Type ◽  
Management Functions

Lithium battery has been employed widely in many industrial applications. Parameter mismatches between lithium batteries along a series string is the critical limits of the large-scale applications in high power situation. Maintaining equalization between batteries is the key technique in lithium batteries application. This paper summarizes normal equalization techniques and proposed a new type of lithium Battery Equalization and Management System (BEMS) employing the isolated DC-DC converter structure. The system is integrated both equalization functions and management functions by using distributed 3-level controlled structure and digital control technique. With this control method the flexibility of the balance control strategy and the compatibility for different battery strings are both improved dramatically. The experimental results show optimizing equalization, efficiency and the battery string life span has been extended.

Process Control Method of Complex Product Multidisciplinary Collaborative Design System

2013 ◽  
Vol 712-715 ◽  
pp. 2888-2893
Author(s):  
Hai Qiang Liu ◽  
Ming Lv
Keyword(s):  
Information Sharing ◽  
Product Design ◽  
Design Process ◽  
Collaborative Design ◽  
Control Method ◽  
Integrated System ◽  
Design System ◽  
System Control ◽  
Complex Product ◽  
Product Design Process

In order to realize information sharing and interchange of complex product multidisciplinary collaborative design (MCD) design process and resources. The Process integrated system control of product multidisciplinary collaborative design was analyzed firstly in this paper, then design process of complex product for supporting multidisciplinary collaborative was introduced, a detailed description is given of the organization structure and modeling process of MCD-oriented Integration of Product Design Meta-model ; and concrete implement process of process integrated system control method was introduced to effectively realize information sharing and interchange between product design process and resources.

Application of Load Sensing Technology in New Type of Steel Arch Installing Machine

2013 ◽  
Vol 655-657 ◽  
pp. 1456-1459
Author(s):  
Li Ping Xu ◽  
Chen Fei Zhan ◽  
De Zhi Ren
Keyword(s):  
Energy Efficient ◽  
Hydraulic System ◽  
Control Performance ◽  
Multiple Fault ◽  
Type Steel ◽  
Load Sensing ◽  
Sensing Technology ◽  
New Type ◽  
Actuator Control

Because ordinary hydraulic system exists multiple fault, power waste and hard controlling in actuators due to the complexity of actuators and variability of load. A new hydraulic system based on the load sensing technology is designed for the new type steel arch installing machine. The results of the simulation for forearm loop based on AMESim show that the designed hydraulic system is energy-efficient and load sensing function is effectively achieved, the actuator control performance is well.

scholarly journals Time-Varying Impedance Control of Port Hamiltonian System with a New Energy-Storing Tank

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Min Zheng ◽  
Tangqing Yuan ◽  
Tao Huang
Keyword(s):  
Control Method ◽  
Impedance Control ◽  
Conservative System ◽  
Time Varying ◽  
Control Performance ◽  
Singularity Problem ◽  
Numerical Examples ◽  
New Energy ◽  
Simulation Results ◽  
New Framework

In order to guarantee the passivity of a kind of conservative system, the port Hamiltonian framework combined with a new energy tank is proposed in this paper. A time-varying impedance controller is designed based on this new framework. The time-varying impedance control method is an extension of conventional impedance control and overcomes the singularity problem that existed in the traditional form of energy tank. The validity of the controller designed in this paper is shown by numerical examples. The simulation results show that the proposed controller can not only eliminate the singularity problem but can also improve the control performance.

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