Specifications

control force was obtained. Results indicated that the minimum of actual sealing pressure ratio
was 0.61 MPa at the combined action of the force produced from the pre-deflection and soil
negative pressure of 20 kPa, but the computational theoretical sealing pressure ratio was 0.61
MPa too. The former was equal to the latter in both of them and met the condition of the actual
sealing pressure ratio which was equal to or greater than the theoretical sealing pressure ratio.
So the minimum of actual sealing pressure ratio was enough to maintain the drip emitter at the
mode of initial shutoff water, and in a critical state of shutoff water and supply water. As long as
soil negative pressure was bigger slightly when soil was drought little by little and it was equal to
21 kPa only or more than it, the actual sealing pressure ratio reduced to 0.54 MPa and far less
than the theoretical sealing pressure ratio. Then the adaptive drip irrigation emitter began to drip
water, and entered the mode of automatic regulation. So it had realized the effective of
self-adjustment drip flow really at the same time.
Number of references: 24
Main heading: Diaphragms
Controlled terms: Critical current density (superconductivity) - Energy dissipation -
Irrigation - Soils - Stresses
Uncontrolled terms: Adaptive - Automatic regulation - Combined actions - Control
volumes - Drip emitter - Force analysis - Negative pressures - Working
mechanisms
Classification code: 421 Strength of Building Materials; Mechanical Properties - 483.1 Soils
and Soil Mechanics - 525.4 Energy Losses (industrial and residential) - 601.2 Machine
Components - 701.1 Electricity: Basic Concepts and Phenomena - 821.3 Agricultural
Methods
DOI: 10.6041/j.issn.1000-1298.2013.08.023
Database: Compendex
Compilation and indexing terms, © 2013 Elsevier Inc.
3.
Accession number: 20133416650891
Title: Novel pre-travel calibration method of touch trigger probe based on error separation
Authors: Gao, Feng1, 2 ; Zhao, Bohan1 ; Li, Yan1 ; Yang, Xingang1 ; Chen, Chun2/高峰;;李艳;杨
新刚;;
Author affiliation: 1 School of Mechanical and Precision Instrument Engineering, Xi'an
University of Technology, Xi'an 710048, China
2 School of Mechanical Engineering, Shaanxi University of Technology, Hanzhong 723003, China
Corresponding author: Gao, F. ([e-mail])
Source title: Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument
Abbreviated source title: Yi Qi Yi Biao Xue Bao
Volume: 34
Issue: 7
Issue date: July 2013
Publication year: 2013
Pages: 1581-1587
Language: Chinese
ISSN: 02543087