scholarly journals Research on Navigation and Positioning Technology of Intelligent Accompanying Tool Car in Dispatching Automation Computer Room

2021 ◽  
Vol 261 ◽  
pp. 01032
Author(s):  
Yufei Song ◽  
Yu Shi ◽  
Tianquan Li ◽  
Xudong Cao ◽  
Xiaohang Liu ◽  
...  
Keyword(s):  
Experimental Test ◽  
Experimental Results ◽  
Vector Map ◽  
Machine Room ◽  
Neural Sensor ◽  
Navigation Method ◽  
Working Point

In view of the wide variety of equipment in the dispatch automation machine room and the dense arrangement of cabinets, a navigation technology suitable for the dispatch automation machine room is proposed on the intelligent companion tool cart. In this paper, three sensors of ultrasonic, infrared and lidar are designed to form an intelligent neural sensor, and the information received by the intelligent neural sensor is calculated to generate a vector map through a software algorithm. At the same time, a plane coordinate network is established. The grid coordinate unit accuracy is 0.1cm. At the same time, the concept of “virtual fence” was put forward to fix the workers at the working point, which increased the safety of work. Subsequently, an experimental test of positioning and navigation of the tool cart was carried out. The experimental results showed that the tool cart can accurately locate and generate a vector map with an accuracy error of less than 10cm. The navigation method has a good application effect and has a good promotion value.

scholarly journals A Pressing Attachment Approach for a Wall-Climbing Robot Utilizing Passive Suction Cups

Robotics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 26
Author(s):  
Dingxin Ge ◽  
Yongchen Tang ◽  
Shugen Ma ◽  
Takahiro Matsuno ◽  
Chao Ren
Keyword(s):  
Experimental Test ◽  
Experimental Results ◽  
Climbing Robot ◽  
Guide Rail ◽  
Test Bed ◽  
Climbing Robots ◽  
Pressing Method ◽  
Suction Cup ◽  
Suction Cups

This paper proposes a pressing method for wall-climbing robots to prevent them from falling. In order to realize the method, the properties of the utilized suction cup are studied experimentally. Then based on the results, a guide rail is designed to distribute the attached suction cup force and implement the pressing method. A prototype of a wall-climbing robot that utilizes passive suction cups and one motor is used to demonstrate the proposed method. An experimental test-bed is designed to measure the force changes of the suction cup when the robot climbs upwards. The experimental results validate that the suction cup can completely attach to the surface by the proposed method, and demonstrate that the robot can climb upwards without falling.

scholarly journals Mechanical Characterization of the Plastic Material GF-PA6 Manufactured Using FDM Technology for a Compression Uniaxial Stress Field via an Experimental and Numerical Analysis

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 246 ◽  
Author(s):  
Jorge Manuel Mercado-Colmenero ◽  
Cristina Martin-Doñate ◽  
Vincenzo Moramarco ◽  
Michele Angelo Attolico ◽  
Gilda Renna ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Stress Field ◽  
Experimental Test ◽  
Plastic Material ◽  
Uniaxial Stress ◽  
Experimental Results ◽  
Structural Behavior ◽  
Elastic Behavior ◽  
Fused Deposition ◽  
Industrial Part

This manuscript presents an experimental and numerical analysis of the mechanical structural behavior of Nylstrong GF-PA6, a plastic material manufactured using FDM (fused deposition modeling) technology for a compression uniaxial stress field. Firstly, an experimental test using several test specimens fabricated in the Z and X-axis allows characterizing the elastic behavior of the reinforced GF-PA6 according to the ISO 604 standard for uniaxial compression stress environments in both Z and X manufacturing orientations. In a second stage, an experimental test analyzes the structural behavior of an industrial part manufactured under the same conditions as the test specimens. The experimental results for the test specimens manufactured in the Z and X-axis present differences in the stress-strain curve. Z-axis printed elements present a purely linear elastic behavior and lower structural integrity, while X-axis printed elements present a nonlinear elastic behavior typical of plastic and foam materials. In order to validate the experimental results, numerical analysis for an industrial part is carried out, defining the material GF-PA6 as elastic and isotropic with constant Young’s compression modulus according to ISO standard 604. Simulations and experimental tests show good accuracy, obtaining errors of 0.91% on the Z axis and 0.56% on the X-axis between virtual and physical models.

scholarly journals A hand-drawn map-based navigation method for mobile robots using objectness measure

2019 ◽  
Vol 16 (3) ◽  
pp. 172988141984633 ◽  
Author(s):  
Jie Niu ◽  
Kun Qian
Keyword(s):  
Mobile Robots ◽  
Autonomous Navigation ◽  
Saliency Map ◽  
Experimental Results ◽  
Environment Map ◽  
Environmental Cognition ◽  
Candidate Regions ◽  
Cognitive Environment ◽  
Candidate Object ◽  
Navigation Method

Correct cognition of the environment is the premise of mobile robots to realize autonomous navigation control tasks. The inconsistency caused by time-varying environmental information is a bottleneck for the development and application of cognitive environment technologies. In this article, we propose an environmental cognition method that uses a hand-drawn map. Firstly, we use the single skeleton refinement and fuzzy c-means algorithms to segment the image. Then, we select candidate regions combining the saliency map. At the same time, we use the superpixels straddling method to filter the windows. The final candidate object regions are obtained based on a fusion of saliency segmentation and superpixels clustering. Based on the above objectness estimation results, we use a human–computer interaction method to construct an inaccurate hand-drawn environment map for navigation. The experimental results from PASCAL VOC2007 validate the efficacy of the proposed objectness measure method, where our result of 41.2% on mean average precision is the best of the tested methods. Furthermore, the experimental results of robot navigation in the actual scene also verified the effectiveness of the proposed approach.

Analysis of Failure Modes of a Thermoplastic One-Way Clutch

1991 ◽  
Vol 205 (3) ◽  
pp. 209-215 ◽  
Author(s):  
S C Burgess ◽  
T A Stolarski ◽  
S Karp
Keyword(s):  
Experimental Test ◽  
Failure Modes ◽  
Power Transmission ◽  
Experimental Results ◽  
Test Rig ◽  
New Type ◽  
Experimental Test Rig

This paper presents an analysis of the failure modes during power transmission of a new type of one-way clutch called an expansible-band clutch. The new clutch is made from thermoplastic materials and an experimental test rig has been used to test two material combinations to failure. The experimental results are compared with predictions obtained from empirical formulae. The differences in the two sets of results are used to make conclusions about the failure processes.

scholarly journals Experimental Test on Bridge Reinforcement by Enlarging Section-Prestress Method

2020 ◽  
Vol 165 ◽  
pp. 04015
Author(s):  
Li Jia ◽  
Liu Tao ◽  
Huang Hong ◽  
Jiang Jian ◽  
Huang Zhi
Keyword(s):  
Bearing Capacity ◽  
Experimental Test ◽  
Ultimate Bearing Capacity ◽  
Model Tests ◽  
Crack Development ◽  
Experimental Results ◽  
Concentrated Load ◽  
External Prestressing ◽  
Rectangular Beam ◽  
Load Characteristics

This paper proposes the method of enlarging section combined with prestressed tendon (Enlarging Section-Prestress Method), which has the advantages of both increasing section and external prestressing, such as reducing section height, the prestressing tendon do not rust easily, and the appearance is beautiful. Model tests were carried out, two rectangular beam models with the same section and length were made, one was reinforced by Enlarging Section-Prestress Method, and no reinforced action was taken as a control. Two points of concentrated load were applied to the model beams, and the two tests were compared in terms of deflection-load characteristics and crack development. The experimental results show that the Enlarging Section-Prestress Method is effective, which improved the ultimate bearing capacity of the beam obviously, and reduced the deflection of the trabecular beam.

Operation and Startup of Three-Phase Grid-Connected PWM Inverter for an Experimental Test Bench With DSPACE Real-Time Implementation of PQ Control

2022 ◽  
pp. 207-232
Author(s):  
Kamal Elyaalaoui ◽  
Moussa Labbadi ◽  
Khalid Chigane ◽  
Mohammed Ouassaid ◽  
Mohamed Cherkaoui
Keyword(s):  
Power Control ◽  
Real Time ◽  
Experimental Test ◽  
Control Strategy ◽  
Test Bench ◽  
Experimental Results ◽  
Electrical Network ◽  
Three Phase ◽  
Grid Connected Inverter ◽  
Experimental Test Bench

The main objective of this chapter is the experimental validation of active and reactive power control at the connection point for a three-phase grid connected inverter. It gives an overview on the adopted vector control strategy, regulation of the angle of orientation of the blades (pitch control), synchronization grid side converter to the power network using phase closed loop (PLL). Once the experimental test bench is described, the authors devote a first part to the design of the block circuit diagram of the experimental platform and the control strategy implemented in the DSPace DS1104, and they suggest some steps to associate the inverter to the electrical network. Subsequently, they discuss the experimental results validating the proposed power control. The purpose of this experimental results is the DSPACE real-time implementation of PQ control using three-phase inverter and development of a startup algorithm of the experimental test bench.

A novel tunable stiffness mechanism using filament jamming

2021 ◽  
pp. 1-11
Author(s):  
Junfeng Hu ◽  
Chengkun Xiao ◽  
Tao Wen
Keyword(s):  
Mechanical Behavior ◽  
Experimental Test ◽  
Real World ◽  
Dynamic Performance ◽  
Experimental Results ◽  
Important Method ◽  
High Stiffness ◽  
Stiffness Variation ◽  
New Generation ◽  
Tunable Stiffness

Abstract The jamming mechanism is an important method to tune the stiffness of soft-bodied machines to enable them to adapt to their surroundings. However, it is difficult for the present jamming structures to integrate them into complicated structures such as twist, cylinder, and spiral. This paper introduces a novel jamming mechanism termed a filament jamming technique, which varies stiffness using jamming of a cluster of tiny and compliant filaments. The jamming structure demonstrated a variety of characteristics such as softness, shape compatibility, lightweight, and high stiffness, which these feats can meet to a variety of application scenarios that the traditional jamming one cannot afford. The mechanical behavior of the jamming structure was studied with an experimental test, in which the experimental results illustrated that its structural and material factors affect stiffness variation and dynamic performance. To demonstrate the advantage of the jamming technique, we constructed a soft gripper and a torsional actuator to demonstrate how the mechanics of filament jamming can enhance the performance of real-world robotics systems. Therefore, the filament jamming mechanism provides a variety of machines and structures with additional properties to increase forces transmitted to the environment and to tune response and damping. This study aims to foster a new generation of mechanically versatile machines and structures with both softness and stiffness.

scholarly journals Theory Versus Experiment for the Rotordynamic Coefficients of Annular Gas Seals: Part 2—Constant-Clearance and Convergent-Tapered Geometry

1986 ◽  
Vol 108 (3) ◽  
pp. 433-437 ◽  
Author(s):  
C. C. Nelson ◽  
D. W. Childs ◽  
C. Nicks ◽  
D. Elrod
Keyword(s):  
Experimental Test ◽  
Experimental Results ◽  
Test Facility ◽  
Rotordynamic Coefficients ◽  
Theory Versus ◽  
Direct Stiffness ◽  
Gas Seals ◽  
Predicted Values

An experimental test facility is used to measure the leakage and rotordynamic coefficients of constant-clearance and convergent-tapered annular gas seals. The results are presented along with the theoretically predicted values. Of particular interest is the prediction that optimally tapered seals will have significantly larger direct stiffness than straight seals. The experimental results verify this prediction. Generally the theory does quite well, but fails to predict the large increase in direct stiffness when the fluid is prerotated.

Increased Wear Resistance of Roller Bearings Using Me-C: H Coated Rollers

2000 ◽  
Vol 122 (4) ◽  
pp. 682-688 ◽  
Author(s):  
Ulf Olofsson ◽  
Hans Sjo¨stro¨m ◽  
Ulf Sjo¨din
Keyword(s):  
Wear Resistance ◽  
Fatigue Life ◽  
Coefficient Of Friction ◽  
Amorphous Carbon ◽  
Experimental Test ◽  
Thrust Bearing ◽  
Surface Hardness ◽  
Experimental Results ◽  
Contact Surfaces ◽  
Number Of Particles

The contact surfaces in a boundary lubricated spherical roller thrust bearing can change form due to sliding and particle generated wear. These form changes can seriously reduce the fatigue life of the bearings. An experimental test series has been performed where this effect was investigated in bearings with metal mixed amorphous carbon, Me-C: H, coated rollers that were tested against bearings with standard rollers. The experimental results show that while the bearings with standard rollers can fail due to wear, the bearings with coated rollers are at the same time almost unaffected by wear. Also the number of particles generated in the contact was significantly less when using coated rollers. There were twice as many self-generated particles when using a standard bearing compared with a coated bearing. The effect of the coating is discussed in terms of surface hardness, coefficient of friction and tribochemical phenomena. [S0742-4787(00)02004-X]

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