scholarly journals Chassis Design of Tomato Picking Robot in the Greenhouse

2021 ◽  
Vol 2136 (1) ◽  
pp. 012047
Author(s):  
Tao Zhu ◽  
JinHua Xiang
Keyword(s):  
Mechanical System ◽  
Motion Control ◽  
Control Algorithm ◽  
Electrical System ◽  
Damage Rate ◽  
Artificial Fruit ◽  
Fruit Damage ◽  
The Times ◽  
Basic Motion

Abstract At present, the artificial fruit picking cost is high, the fruit damage rate is high, and the efficiency is low, so the greenhouse picking robot emerges as the times’ demand. Therefore, this paper designs a kind of a chassis system of greenhouse picking robots. This paper mainly designed and simulates the chassis mechanical system, electrical system, and basic motion control algorithm from three aspects. Finally, the prototype of the chassis system of the picking robot in the greenhouse is completed and the chassis system is debugged, which proves that it has the characteristics of adaptability to the greenhouse environment, strong universality, and strong expansibility.

Bed behavioral assessment of tomato varieties in Cote d Ivoire

2015 ◽  
Vol 5 (1) ◽  
pp. 513-522
Author(s):  
Jean-Claude N'ZI ◽  
Lassina FONDIO ◽  
Mako Francois De Paul N’GBESSO ◽  
Andé Hortense DJIDJI ◽  
Christophe KOUAME
Keyword(s):  
Behavioral Assessment ◽  
Development Stage ◽  
Research Centre ◽  
Vegetative Development ◽  
Potential Yield ◽  
Tomato Plants ◽  
Bacterial Diseases ◽  
Damage Rate ◽  
Fruit Damage ◽  
Tomato Breeding

Thirty accessions of tomato including twenty eight introduced accessions from The World Vegetable Center-AVRDC and as controls, two commercial varieties Mongal and Calinago, were assessed for agronomic performances at the Experimentation and Production Station of Angud dou of the National Agronomic Research Centre (CNRA) located in the South of Cote d Ivoire. The trial was arranged in a randomized block with three replications. The following parameters were determined at vegetative development stage: plant height at flowering stage, susceptibility of accessions to diseases, day to 50% flowering and day of first harvest, production duration, fruit length, fruit diameter, total number of fruits, number of fruits per plant, potential yield, net yield and fruit damage rate. Results showed that the commercial variety Mongal, with a potential yield of 15.9 and a net yield of 13.1 t ha-1, was the most productive. All the introduced accessions from AVRDC recorded the lowest potential yields from 2.2 to 9.7 t ha-1, and net yields from 1.7 to 8.6 t ha-1. In addition, accessions WVCT8, FMTT847 and WVCT13 were severely infested by bacterial wilt. The reduction of the net yield of tomato accessions resulted in the high fruit damage rates. For the future tomato breeding work, it would be appropriate to introduce into the trials bacterial diseases tolerant varieties. Moreover, some studies could be undertaken to determine the nature of the bacteria involved in the plant wilting and to find out the causal agent of the tomato plants burning at the fructification stage reducing the harvest duration.

scholarly journals Autonomous Navigation of a Team of Unmanned Surface Vehicles for Intercepting Intruders on a Region Boundary

Sensors ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 297
Author(s):  
Ali Marzoughi ◽  
Andrey V. Savkin
Keyword(s):  
Motion Control ◽  
Autonomous Vehicles ◽  
Autonomous Navigation ◽  
Control Algorithm ◽  
Autonomous Vehicle ◽  
Sufficient Conditions ◽  
Real Life ◽  
Unmanned Surface Vehicles ◽  
Necessary And Sufficient ◽  
See Region

We study problems of intercepting single and multiple invasive intruders on a boundary of a planar region by employing a team of autonomous unmanned surface vehicles. First, the problem of intercepting a single intruder has been studied and then the proposed strategy has been applied to intercepting multiple intruders on the region boundary. Based on the proposed decentralised motion control algorithm and decision making strategy, each autonomous vehicle intercepts any intruder, which tends to leave the region by detecting the most vulnerable point of the boundary. An efficient and simple mathematical rules based control algorithm for navigating the autonomous vehicles on the boundary of the see region is developed. The proposed algorithm is computationally simple and easily implementable in real life intruder interception applications. In this paper, we obtain necessary and sufficient conditions for the existence of a real-time solution to the considered problem of intruder interception. The effectiveness of the proposed method is confirmed by computer simulations with both single and multiple intruders.

The Synchronization Control of the Hydraulic Press Brake Based on the Virtual Shaft Control Algorithm

2011 ◽  
Vol 383-390 ◽  
pp. 574-579 ◽  
Author(s):  
Guang Fei Liu ◽  
Su Ling Li ◽  
Lei Zhang
Keyword(s):  
Motion Control ◽  
Control Algorithm ◽  
Hydraulic Press ◽  
Synchronization Control ◽  
Existing Problems ◽  
Synchronous System ◽  
Working Principle

This paper simulated the virtual master shaft based on the analysis of the working principle and the existing problems of the hydraulic press brake as well as based on the application of the virtual shaft algorithm in motion control, which directly drive the synchronous system of the hydraulic press brake. We established the model of the virtual master axis and the model of the hydraulic press brake which based on the virtual shaft algorithm, and simulated the models in Mat lab. We obtain the better effect in the accuracy and combination property.

scholarly journals Motion Control Algorithm Expanding Arithmetic Operation for Low-Cost Microprocessor

2012 ◽  
Vol 18 (12) ◽  
pp. 1079-1085
Author(s):  
Sang-Chan Moon ◽  
Jae-Jun Kim ◽  
Kyu-Min Nam ◽  
Byoung-Soo Kim ◽  
Soon-Geul Lee
Keyword(s):  
Motion Control ◽  
Control Algorithm ◽  
Low Cost ◽  
Arithmetic Operation

scholarly journals Improving Ceratitis capitata control through the mass trapping technique in an IPM programme on apricots in Tunisia

2021 ◽  
Author(s):  
Mohamed Elimem
Keyword(s):  
Integrated Pest Management ◽  
Pest Management ◽  
Ceratitis Capitata ◽  
Conventional Approach ◽  
Mass Trapping ◽  
Organophosphate Pesticide ◽  
New Techniques ◽  
Damage Rate ◽  
Fruit Damage

New techniques for Ceratitis capitata (Wiedemann, 1824) control are being studied and developed to replace traditional organophosphate pesticide applications. A mass trapping strategy offers promising medfly control within integrated pest management (IPM) programmes. Field assays were performed to study the efficacy of two mass trapping techniques based on PheroNorm<sup>®</sup> and Ceratrap<sup>®</sup> lures that were compared to a conventional approach to control the medfly in Tunisian apricot orchards. The results showed that both mass trapping techniques had a similar efficiency in reducing the C. capitata population. The degrees Brix in the fruits was a determinant issue since the initial apricot fruit damage was detected at 6.4%. At harvesting, the lowest fruit damage rate was recorded in the PheroNorm<sup>®</sup> (4.25%) and Ceratrap<sup>®</sup> (6.50%) treated orchards, compared with the conventional approach (10.75%). Therefore, the use of 50 PheroNorm<sup>®</sup> and Ceratrap<sup>®</sup> traps per ha density within an IPM approach may be very useful to control the C. capitata populations in apricot orchards.

Experimental Investigation of a Piezoelectrically Actuated Rotating Parts Feeder

1997 ◽  
Author(s):  
S. H. Chang ◽  
T. W. Yang
Keyword(s):  
Mechanical System ◽  
Electromechanical Coupling ◽  
Laser Interferometer ◽  
Vertical Vibration ◽  
Electromechanical Coupling Coefficient ◽  
Automated Manufacturing ◽  
Electrical System ◽  
Resonance Frequencies ◽  
Displacement Sensitivity ◽  
Small Parts

Abstract The parts feeder provides both horizontal and vertical forces to transfer the small parts between stations in automated manufacturing processes. In this paper, the dynamic characteristics of a piezoelectrically actuated rotating parts feeder was evaluated. The model of the piezoelectric bimorph, the key component of the parts feeder, is formulated under DC and AC excitation. Experiments using laser interferometer, impedance analyzer and spectrum analyzer were conducted to measure displacement sensitivity, resonance frequencies and antiresonance frequencies of the electrical/mechanical system. Relations between driving frequencies and vibration amplitudes under various driving voltages were reported. From experimental results, the resonance frequencies of the mechanical system were identified at 176.6 Hz and 535 Hz. The first resonance and anti-resonance frequencies of the electrical system were found at 176.0 Hz and 177.5 Hz. The electromechanical coupling coefficient for piezoelectric actuator using Mason formula is 13%. Operating at the first resonance frequency, the parts feeder feeds at 17.66 mm/sec with a vertical vibration amplitude of 14.2 μ m.

Construction of program movements of two!handed technological robots

2021 ◽  
pp. 44-50
Author(s):  
Keyword(s):  
Motion Control ◽  
Relative Motion ◽  
Control Algorithm ◽  
Robotic Systems ◽  
And Control

Some issues of creation and control of two-handed robotic systems are considered. Keywords: two-handed robot, relative manipulation mechanism, relative motion, control algorithm, assembly [email protected]

Sign in / Sign up

Export Citation Format

Share Document