scholarly journals Development of two-redundant multi-turn absolute encoder based on small modulus reducer

2022 ◽  
Vol 355 ◽  
pp. 02057
Author(s):  
Wei Xiong ◽  
Yajun Ma ◽  
Zhen Wang ◽  
Weiwei Jiao ◽  
Wei Shi ◽  
...  
Keyword(s):  
High Speed ◽  
Simulation Analysis ◽  
High Reliability ◽  
Angular Displacement ◽  
Dynamic Performance ◽  
Displacement Sensor ◽  
Weight System ◽  
Servo Motor ◽  
Compact Structure ◽  
Absolute Encoder

In order to meet the development needs of aerospace servo technology, the angular displacement sensor, which compact structure, high reliability, and be able to adapt to harsh working environments is used for the measurement and feedback of the high speed of the servo motor output shaft. The design of a two-redundant multi-turn absolute encoder based on a single-turn absolute encoder and a precision small modulus reducer, which realizes the high speed measurement of the servo motor shaft at 8000 rpm. Product performance meets the technical indicators of similar products of HEIDENHAIN encoders, can withstand high temperature, long working life, good dynamic performance, small space and light weight. System test and simulation analysis show that the design technical scheme is effective and feasible, can meet the requirements of the servo system.

scholarly journals A Novel Stick-Slip Nanopositioning Stage Integrated with a Flexure Hinge-Based Friction Force Adjusting Structure

Micromachines ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 765
Author(s):  
Junhui Zhu ◽  
Peng Pan ◽  
Yong Wang ◽  
Sen Gu ◽  
Rongan Zhai ◽  
...  
Keyword(s):  
Friction Force ◽  
High Speed ◽  
Simulation Analysis ◽  
Load Capacity ◽  
Dynamic Performance ◽  
Critical Role ◽  
Vertical Direction ◽  
Flexure Hinge ◽  
Stick Slip ◽  
Static Performance

The piezoelectrically-actuated stick-slip nanopositioning stage (PASSNS) has been applied extensively, and many designs of PASSNSs have been developed. The friction force between the stick-slip surfaces plays a critical role in successful movement of the stage, which influences the load capacity, dynamic performance, and positioning accuracy of the PASSNS. Toward solving the influence problems of friction force, this paper presents a novel stick-slip nanopositioning stage where the flexure hinge-based friction force adjusting unit was employed. Numerical analysis was conducted to estimate the static performance of the stage, a dynamic model was established, and simulation analysis was performed to study the dynamic performance of the stage. Further, a prototype was manufactured and a series of experiments were carried out to test the performance of the stage. The results show that the maximum forward and backward movement speeds of the stage are 1 and 0.7 mm/s, respectively, and the minimum forward and backward step displacements are approximately 11 and 12 nm, respectively. Compared to the step displacement under no working load, the forward and backward step displacements only increase by 6% and 8% with a working load of 20 g, respectively. And the load capacity of the PASSNS in the vertical direction is about 72 g. The experimental results confirm the feasibility of the proposed stage, and high accuracy, high speed, and good robustness to varying loads were achieved. These results demonstrate the great potential of the developed stage in many nanopositioning applications.

The Application of RAKE Receiving Technology in the Underwater SS Communication

2014 ◽  
Vol 513-517 ◽  
pp. 4248-4252 ◽  
Author(s):  
Yun Hang Zhu ◽  
Zhi Hui Deng
Keyword(s):  
High Speed ◽  
Simulation Analysis ◽  
High Reliability ◽  
Underwater Acoustic Communication ◽  
Technical Solution ◽  
Acoustic Transmission ◽  
Long Distance ◽  
Underwater Acoustic ◽  
Underwater Wireless Communication ◽  
Spreading Spectrum

In recent years, the strategic significance of the oceans is growing as well as its research and development needs. The underwater wireless communication is becoming more and more important. The underwater acoustic communication is one of the few mediums which can conduct the underwater transmission over a long distance, and the multipath effect is the major obstacle of affecting the systems high speed and high reliability. The characteristics of underwater acoustic fading and coherent multi-path channel are studied, and the model of underwater acoustic spreading spectrum (SS) communication system is established. The affect of coding technique on the systems performance are analyzed in detail. The improved RAKE receiving technical solution is put forward, whose simulation analysis and data in different combining ways are given. It is proved that the scheme can better solve the problem of multipath interference in underwater acoustic transmission.

Simulation Analysis of Influences of Anti-Roll Torsion Bar on Vehicle Dynamics

2013 ◽  
Vol 409-410 ◽  
pp. 1486-1491
Author(s):  
Zhuo Yu He
Keyword(s):  
Vehicle Dynamics ◽  
High Speed ◽  
Simulation Analysis ◽  
Dynamic Performance ◽  
Rail Vehicles ◽  
Urban Rail ◽  
Passenger Trains ◽  
Secondary Suspension ◽  
Dynamics Models ◽  
Torsion Bar

In the secondary suspension of urban rail vehicles and high-speed passenger trains, combination of air springs and anti-roll torsion bar is widely used. However, in its practical use, cracks appear in the anti-roll torsion bar and vehicle curve performance is lower. Through analysis of anti-roll torsion bar, acceleration being taken into account, the dynamics models of anti-roll torsion bar and the vehicle itself are established. The results indicate that the combination of anti-roll torsion bar and rubber joints is superior to present a more reasonable anti-roll stiffness, to ensure better dynamic performance of the train, and also to lengthen the life of the anti-roll torsion bar.

Research on the Motor Friction Model of Electro-Hydraulic Servo System

2013 ◽  
Vol 579-580 ◽  
pp. 594-597 ◽  
Author(s):  
Xiao Jing Wang ◽  
Wen Xuan Han ◽  
Xiao Cui ◽  
Shuo Ze Li ◽  
Cheng Zhi Du
Keyword(s):  
Simulation Analysis ◽  
Angular Displacement ◽  
Servo System ◽  
Friction Model ◽  
Friction Torque ◽  
Servo Motor ◽  
Lugre Friction Model ◽  
Hydraulic Servo ◽  
Friction Models ◽  
Hydraulic Servo System

In order to improve the performance of the electro-hydraulic servo system, considering the special structure of servo motor, nonlinear model of the servo motor was established in time domain. Several friction models commonly used in project were introduced and applied to the simulation analysis of servo motor with friction torque. The simulation curves show the relationship between driving torque, friction torque, angular velocity and angular displacement. The result confirms the influence of the different friction torque model on the performance of motor, and the LuGre friction model is identified which is fit for the friction torque compensation. This study lays the foundation for the friction torque compensation of electro-hydraulic servo motor.

Frequency Meter with Equal Precision Based FPGA + MCU

2014 ◽  
Vol 614 ◽  
pp. 308-311
Author(s):  
Peng Wang ◽  
Chang Jia Yan ◽  
Tong Niu ◽  
Xue Fang ◽  
Zhi Peng Jin ◽  
...  
Keyword(s):  
High Speed ◽  
Control Function ◽  
High Reliability ◽  
Frequency Measurement ◽  
Measurement Range ◽  
Duty Ratio ◽  
Measurement Technology ◽  
Measured Signal ◽  
Compact Structure ◽  
Frequency Meter

Aiming at such disadvantages of traditional frequency measurement technology as low precision and small measurement range, the combination of FPGA and MCU is applied in this paper to realize equal precision frequency measurement. The system makes full use of advantages FPGA, which has high speed and multi-I/O port, and MCU which has good man-machine interface and flexible control function. By controlling the time of enable signal allowed frequency measurement equal to integer cycles of measured signal, the frequency measurement accuracy can keep constant in the whole measurement range. The frequency measurement range of meter is 0.1 Hz~ 50 MHz, and the accuracy of frequency measurement is 10-6 Hz. In addition to measuring frequency, the system also can detect the period, pulse width and duty ratio. The simulation and experimental results show that the frequency meter has such advantages as compact structure, small volume, high reliability and precision and wide frequency measurement range.

scholarly journals INDUCTIVE LINEAR DISPLACEMENT SENSOR IN ACTIVE MAGNETIC BEARING

2019 ◽  
Vol 3 ◽  
pp. 151
Author(s):  
Sergei Loginov ◽  
Dmitriy Fedorov ◽  
Igor Savrayev ◽  
Igor Plokhov ◽  
Andrey Hitrov ◽  
...  
Keyword(s):  
Control System ◽  
High Speed ◽  
High Reliability ◽  
Magnetic Bearing ◽  
Linear Displacement ◽  
Magnetic Bearings ◽  
Active Magnetic Bearing ◽  
Displacement Sensor ◽  
Main Trend ◽  
Active Magnetic Bearings

Active magnetic bearings are increasingly used in various fields of industry. The absence of mechanical contact makes it possible to use them in ultra-high-speed electric drives. The main trend of active magnetic bearings development is the improvement of the control system. The main problem of the control system is the displacement sensor (most of them has low accuracy and large interference). The sensor must have the following properties: simple in realization, high linearity of the characteristic, high sensitivity and noise immunity, high reliability. At the present time there is no sensor that satisfies all these conditions. Most manufacturers use various kinds of filters to get an accurate position signal. This increases the response time of the control system. Thus, problem of designing and modeling the position sensor, considered in the article is topical.

Based on Fluid Digital Transmission and Control Theory on Application of Digital Hydraulic Valve

2012 ◽  
Vol 619 ◽  
pp. 455-458
Author(s):  
Wen Hua Li ◽  
Yu Ling Du
Keyword(s):  
Control Theory ◽  
Hydraulic System ◽  
High Speed ◽  
High Efficiency ◽  
Simulation Analysis ◽  
High Reliability ◽  
Electronic Control Unit ◽  
System Pressure ◽  
Analysis Experiment ◽  
Hydraulic Valve

A digital hydraulic valve is a new control theory and method, it is through the electronic control unit installed in a conventional valve, and integrated processing, the formation of a wide variety of digital valve，By the digital-to-analog conversion element is directly connected with the computer. Using the computer output pulse number and frequency to control electro hydraulic system pressure and measurement. The system proposed can make the hydraulic system has the advantages of high efficiency, high speed, high reliability. And used Matlab/Simulink software to control system performance simulation analysis, experiment and simulation results show that, this system has great application prospect and practical value.

Development of a combined magnetic encoder

Sensor Review ◽  
2016 ◽  
Vol 36 (4) ◽  
pp. 386-396 ◽  
Author(s):  
Tong Feng ◽  
Shuanghui Hao ◽  
Minghui Hao ◽  
Jianli Wang
Keyword(s):  
Hall Effect ◽  
Control Systems ◽  
High Speed ◽  
Design Methodology ◽  
Angular Displacement ◽  
Servo Control ◽  
Displacement Sensor ◽  
Content Type ◽  
Photoelectric Encoder ◽  
Special Algorithm

Purpose As a type of angular displacement sensor, the Hall-effect magnetic encoder incorporates many advantages. While compared with the photoelectric encoder, the magnetic encoder nevertheless has lower precision and lower resolution. So, the purpose of this essay is to find a way to increase the precision and resolution of the magnetic encoder. Design/methodology/approach By combining a single-pole magnetic encoder and a multi-pole AlNiCo magnet, the precision and resolution of this combined magnetic encoder are increased without increasing its volume or complicating its structure. A special algorithm system is developed to ensure faithful encoding and decoding. Findings Tests show that the combined magnetic encoder, with a diameter of 67.12 mm (including shaft) and thickness of 6.9 mm, has a precision of ±6′, compared with a 15-bit photoelectric encoder and a static resolution of ±0.6′. Originality/value This new kind of magnetic encoder could be used in specialized fields which need high-precision servo-control systems that are small, have ultra-low-speed and high-speed ratios and are non-oil-polluting or shock-resistant.

The Structure Design and Dynamic Characteristic Simulation Analysis of Electric Spindle Using the PC Grinder of Ceramic Ferrule

2012 ◽  
Vol 472-475 ◽  
pp. 2864-2867
Author(s):  
Run Qin He
Keyword(s):  
High Speed ◽  
Simulation Analysis ◽  
Structure Design ◽  
Precision Machining ◽  
Curvature Radius ◽  
Compact Structure ◽  
Rotating Speed ◽  
Spherical Curvature ◽  
Optical Fiber Connector ◽  
Core Part

The PC grinder of ceramic ferrule is the core part of the processing of Optical—fiber Connector. Through the processing equipment, in order to ensuring the product spherical curvature radius is SR14-18mm, eccentric ≤30 µm, surface roughness of less than 0.01 µm. In grinding process for high rotating speed and high precision machining, here used a motorized spindle technology. High speed spindle is widely applied in high speed grinder whit its advantages of light weight, high speed, compact structure, small inertia, good dynamic characteristics and so on.

Design and analysis of a hydraulic drive downhole traction in-pipe robot based on flexible support structure

2020 ◽  
pp. 095440622091431
Author(s):  
Jianzhong Shang ◽  
Delei Fang ◽  
Zirong Luo ◽  
Rong Wang ◽  
Xin Li ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
High Reliability ◽  
Hydraulic Drive ◽  
Traction Force ◽  
Drive Mode ◽  
Support Structure ◽  
Compact Structure ◽  
Flexible Support ◽  
Safety And Reliability ◽  
Motion Speed

For the strict requirement of convey tools in horizontal well operation, this paper proposes a hydraulic drive downhole traction in-pipe robot based on the flexible support structure, which has the characteristics of compact structure, large traction force, and high reliability. Based on the design of mechanical structure, the motion principle of the robot continuous propulsion is analyzed. Analysis of mechanical characteristics of the flexible support structure is obtained. Hydraulic system including some key hydraulic components are designed and analyzed. Control strategy of purely hydraulic drive mode is researched. Simulation analysis and experimental platform are all accomplished to prove feasibility of purely hydraulic drive mode, and some parameters that affect the robot performance are discussed. Results show that the novel in-pipe robot has a total length of 3.4 m and can adapt to borehole diameter of 155–218 mm. When load is 15 kN, robot motion speed reaches 0.12 m/s. What is more, this novel traction robot does not require an electric power source and has great advantages in safety and reliability, which shows considerable potential for the downhole operation.

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