scholarly journals Optimization of Modulation Methods for Solenoid Valves to Realize an Odor Generation System

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 4009 ◽  
Author(s):  
Manuel Aleixandre ◽  
Kaoru Nakazawa ◽  
Takamichi Nakamoto
Keyword(s):  
Olfactory System ◽  
Pulse Width Modulation ◽  
Generation System ◽  
Delta Sigma ◽  
Vector Network Analyzers ◽  
Network Analyzers ◽  
Quartz Crystal Microbalances ◽  
Modulation Methods ◽  
And Control ◽  
Odor Generation

An artificial olfactory system coupled with an odor generation system is herein reported. The artificial olfactory system is composed of four chemical sensors consisting of quartz crystal microbalances (QCMs) coated with room temperature ionic liquids (RTILs). The sensors are interrogated by four vector network analyzers, which are used to measure the series resonant frequency and motional resistance. The odor generation system can generate eight different odors and mix them in any composition. Solenoid valves are used to switch the path and control the concentration of the different odors before blending. Two algorithms to control the solenoid valves, delta-sigma modulator, and simple pulse width modulation (PWM) are studied, optimized, and compared. Finally, the uncertainty of the odor generating system is calculated.

Principle and control strategy of pulse width modulation rectifier for hydraulic power generation system

2019 ◽  
Vol 135 ◽  
pp. 1200-1206 ◽  
Author(s):  
Kunlin Wang ◽  
Songwei Sheng ◽  
Yaqun Zhang ◽  
Yin Ye ◽  
Jiaqiang Jiang ◽  
...  
Keyword(s):  
Power Generation ◽  
Control Strategy ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Generation System ◽  
Hydraulic Power ◽  
Power Generation System ◽  
And Control

Studies on Triangular Reference with Carrier Overlapping Pulse Width Modulation Methods for Diode Clamped Five Level Inverter

2013 ◽  
Vol 1 (1) ◽  
pp. 8-17
Author(s):  
S. Sumathi ◽  
◽  
D. Meena ◽  
C. R. Balamurugan ◽  
S. P. Natarajan ◽  
...  
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Modulation Methods

A Conceptual Design of the Knee Rehabilitation Device

2012 ◽  
Vol 215-216 ◽  
pp. 225-228
Author(s):  
Liang Han ◽  
You Yang Li ◽  
Qian Zhang
Keyword(s):  
Pulse Width Modulation ◽  
Liquid Crystal Display ◽  
Main Body ◽  
Stepping Motor ◽  
Rehabilitation Process ◽  
Knee Rehabilitation ◽  
Body Design ◽  
And Control ◽  
Micro Controller Unit ◽  
The Given

This paper aims to design a knee rehabilitation device which can help the knee patients to perform movement in bending leg manner. And in that way the rehabilitation process will be improved greatly. The design of the device includes the mechanical main body design, driving motor, and control circuit which contains the keyboard setting, display unit and clock unit. Through the pulse width modulation (PWM) technology the stepping motor is driven and the automatic bent in leg is achieved. During the exercise the following information is known: the starting time, the lasting time, the angle of movement and the speed of movement. The micro controller unit (MCU) is responsible for the information processing from both the key and liquid crystal display (LCD). After the key inputs the given parameters the stepping motor can output the desired motions. Meanwhile, the LCD can display the input information. Now the project has accomplished the preliminary design, and the concrete scheme is shown in this paper.

scholarly journals DIGITAL AND PULSE-WIDTH CONTROL OF A SPACE ROBOT WHEN APPROACHING A GEOSTATIONARY SATELLITE

2020 ◽  
Vol 22 (5) ◽  
pp. 74-78
Author(s):  
Ye.I. Somov ◽  
◽  
S.A. Butyrin ◽  
S.Ye. Somov ◽  
◽  
...  
Keyword(s):  
Pulse Width ◽  
Electric Propulsion ◽  
Pulse Width Modulation ◽  
Geostationary Satellite ◽  
Space Robot ◽  
Control Algorithms ◽  
Control Problems ◽  
Guidance And Control ◽  
Gyroscopic Moment ◽  
And Control

The control problems on a space robot during its approach to an information geostationary satellite are considered. The robot motion control system uses an electric propulsion system with 8 engines at the pulse-width modulation of their thrust values and a gyroscopic moment cluster based on 4 gyrodines with digital control. Numerical results are presented that demonstrate the effectiveness of the developed discrete guidance and control algorithms.

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