Tracking the information about your manuscript
Communicate with the editorial office
Query manuscript payment status Reviewer LoginCollecting, editing, reviewing and other affairs offices
Managing manuscripts
Managing author information and external review Expert Information Author LoginOnline Review
Online Communication with the Editorial Department
Online Journals
Digital Publishing Platform
Page Views
Journal Instruction
Address: No. 10, Yushuang Road, Chengdu, Sichuan Province, 610021
Governed and Sponsored by: China Institute of Measurement and Testing Technology
Frequency: Monthly
General Editor: GAO Jie (Academician of Chinese Academy of Engineering)
Editor-in-chief: YANG Jiebin
International Editor-in-chief: Wynand Louw (President of CIPM)
Director of editorial office: XU Liu
Tel: 86-28-84406505
Email: zgcsjs@163.com
CN: 51-1714/TB
ISSN: 1674-5124
Chinese Core Journal by PKU. Welcome to submit your paper.
WeChat Official Account: zhongguoceshi
Development trends of online measurement and in-situ calibration technologies for mechanical quantities in equipment
LIU Guixiong;HUANG Tianyi;LIN Feizhen;[Objective] To meet the requirements of online measurement of mechanical quantities in equipment for multi-component sensing, on-site calibration, and credibility evaluation in intelligent manufacturing.[Methods] This paper reviews online measurement technologies for force, torque, and multi-axis loads, and analyzes the applicability of strain-gauge, piezoelectric, fiber Bragg grating, capacitive, and multi-axis force/torque sensing technologies. Research progress in in-situ calibration, online decoupling, nonlinear fitting,dynamic algorithms, compensation, and intelligent calibration methods is summarized. The effects of channel coupling, installation state, calibration error, model residuals, and finite-sample conditions on measurement credibility are discussed. [Results] The measurement of mechanical quantities in equipment is shifting from sensor-performance improvement toward systematic measurement capability under real operating conditions.[Conclusion] Future research should focus on multi-component low-coupling sensing, on-site in-situ calibration, finite-sample decoupling calibration for rapid measurement traceability, and online uncertainty evaluation.
Research on influence of simple and complex terrain on the ground-airborne transient electromagnetic method
CUI Haoping;HE Yuxuan;HU Donglei;RAO Liting;[Objective] Topographic relief can distort the observed responses of the ground-airborne transient electromagnetic method. To reveal the influence of different terrains on the ground-airborne transient electromagnetic field, this paper aims to investigate the anomalous variation patterns and common characteristics of observed responses under both simple and complex terrain conditions through threedimensional numerical simulation. [Methods] Based on the finite element method, a three-dimensional numerical simulation of the grounded-source ground-airborne transient electromagnetic method is implemented. Detection models involving simple and complex terrains with similar scales are constructed.Under a fixed flight height, the anomalous variations of the observed responses are systematically analyzed from three aspects: along the equatorial flight line, in the surface coverage mode, and at typical observation points. The similarities and differences in the influence characteristics of simple and complex terrains on the observation results are then summarized. [Results] Results show that the influence characteristics and laws of simple and complex terrains on the observed responses are generally consistent. However, due to slight discrepancies in their overall scales, the influence magnitudes and spatial distribution patterns of the two terrain types exhibit minor differences. [Conclusion] Conducting terrain effect studies using simple terrains with comparable scales can provide an important basis for understanding and predicting observed responses under various complex terrain conditions, offering practical guiding value.
Performance analysis of variable-load operation for coal-fired power units assisted by molten salt thermal energy storage
HAN Xu;CAO Yi;ZHANG Jie;[Objective] To enhance the flexibility and energy efficiency of coal-fired units in high-renewable power grids, this study investigates a 1 050 MW ultra-supercritical unit coupled with a molten salt thermal energy storage system. [Methods] A system model covering both charging and discharging phases is established to analyze the effects of different steam extraction and feedwater heating configurations on thermal performance,aiming to identify an optimal energy storage and release strategy. [Results] Results show that mixing main steam exhaust into the boiler feedwater yields the highest cycle efficiency of 50.1%, while returning reheated steam exhaust to the fifth low-pressure heater outlet offers the best economy. The optimal discharging scheme—returning feedwater from the pump outlet to the high-pressure turbine inlet-achieves a peak-shaving capacity of 26.3 MW, cycle efficiency of 50.54%, and coal consumption rate of 253.17 g/kWh. [Conclusion] This study provides a feasible technical path and theoretical reference for flexibility retrofits of coal-fired units.
In-situ measurement method for low-frequency vibration based on machine vision
WANG Xinyu;ZHOU Zhenjie;BAI Fuzhong;HUANG Yong;YANG Yang;[Objective] To address the issues of complex calibrating procedure for low-frequency vibration sensor, susceptibility to environmental interference, difficulties in achieving flatness calibration within the transportation industry, and the urgent need for non-contact vibration monitoring technique in building structures and others scenarios, this paper proposed an in-situ measurement method of low-frequency vibration based on machine vision. [Methods] High-contrast artificial targets were arranged, and a camera captured video sequences of the vibrating targets. The YOLOv4-Tiny object detection algorithm was integrated with an enhanced template matching-based corner detection algorithm to extract target feature points. The frequency and amplitude parameters of the vibration signal were then determined using a Fourier series fitting algorithm.[Results] Comparative experiments were conducted against a standard sensor under vibration excitations ranging from 1 to 20 Hz in frequency and 0.2 to 100 mm in amplitude. Results demonstrate a maximum relative frequency error of 0.164%(mean error: 0.071%) and a maximum relative amplitude error of 0.769%(for amplitudes ≥0.25 mm, mean error: 0.162%). The combined standard uncertainties(k=1) for frequency and amplitude measurements were 0.31% and 0.28%, respectively. [Conclusion] This method is simple,portable, no requirement of complex installation, and shows significant application value for in-situ calibration of low-frequency vibration sensors and vibration monitoring of structures such as bridges.