Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (6): 1892-1905.doi: 10.13229/j.cnki.jdxbgxb.20231023

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Effect of parasitic load components with multi⁃directional motion on weight⁃sensing outputs

Gui-yong GUO1,2,3,4,5(),Jian-feng ZHONG1,2(),Qiu-kun ZHANG1,2,Bao-jie CAI3,4,5   

  1. 1.School of Mechanical Engineering and Automation，Fuzhou University，Fuzhou 350108，China
    2.Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing，Fuzhou University，Fuzhou 350108，China
    3.Division of Construction and Transportation，Fujian Institute of Metrology，Fuzhou 350003，China
    4.Fujian Key Laboratory of Force Measurement，Fuzhou 350100，China
    5.Key Laboratory of Force Measurement for State Market Regulation，Fuzhou 350100，China
  • Received:2023-09-25 Online:2025-06-01 Published:2025-07-23
  • Contact: Jian-feng ZHONG E-mail:13960922779@163.com;zhongjianfeng@fzu.edu.cn

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Abstract:

For the parasitic load component generated by multi-component superposition effect has a great influence on the weight-sensing output， a variable parameter and multi-component output effect assessment method based on the overall structure was proposed. Subsequently， a mathematical theoretical model of the instantaneous characteristics of "strain-total weight-motion" was established and analyzed by finite element simulation. In addition， exploring the characteristics of the multi-directional motions with transverse， longitudinal and rotating around an axis that are commonly seen in the weighing process， which include parasitic effects such as changing the total weight， rotating speed and angular acceleration， etc. Eventually， the reasonableness of the theoretical model and simulation analysis was verified through experimental tests. The results showed that the parasitic load component of transverse motion had the smallest influence on the output， and the maximum deviation was no more than 0.001%FS （ Full Scale）； followed by longitudinal motion， and the maximum deviation was no more than 0.015%FS； and the parasitic load component of themotion of rotating around an axis had the largest influence on the output， and the maximum deviation can be up to 0.5%FS， and it was changed with the differences of the total weight and the rotating speed， which provided a technical support and accuracy compensation technology for dynamic weighing application of the weight-sensing structure. This law provides the technical support of accuracy compensation and scientific evaluation basis for the dynamic weighing application of weight-sensing structure.

Key words: measurement technology and instrument, load cell, weight-sensing structure, multi-directional motion, rotation, strain, load

CLC Number: 

  • TH715

Fig.1

Working principle diagram of weighing sensor structure movement"

Fig.2

Model of the weight-sensing structure （including some connecting parts）"

Table 1

Boundary dimension parameters of weight-sensing structure and part of connector body"

参数符号数值/mm
称重传感结构弹性体总长度L1176
T形垫块中心线与弹性体右端面距离L29
窄槽底部圆角中心长度L3110
贴片区域长度L466.2
空心槽圆角中心长度（即两个应变截面距离）L525
贴片区空心槽宽度L630
左应变片贴片与弹性体左端面距离L775.5
Y向第一个连接件主体长度L8143
弹性体总高度H1125
窄槽底部圆角中心宽度H275
空心槽圆角中心宽度H381.7
弹性体总宽度B80
Y向第一个连接件主体宽度B169
Y向第一个连接件主体厚度B224
贴片区空心槽圆角半径R7.5
窄槽底部圆角半径r4

Fig.3

Schematic diagram for analysing the load carrying capacity of a weight-sensing structure with multi-directional motion （rotation around an axis）"

Fig.4

Finite element model of weighing sensor structure and strain distribution position of patch area"

Fig.5

Wheatstone bridge"

Fig.6

Micro-strain distribution pattern at strain gage patches of weight-sensing structure"

Fig.7

Experimental photographs of multi-directional movements of the weight-sensing structure"

Fig.8

Experimental verification results of lateral/longitudinal motion of weighing sensor structure"

Fig.9

Experimental photographs of the weight- sensing structure with rotation around an axis"

Fig.10

Experimental plots of output effects of symmetrical weight sensing structures at different azimuths"

Fig.11

Experimental validation results of weight-sensing structures with rotation around an axis （connected parts in different directions）"

Fig.12

Comparison of the output deviation of different weight-sensing structures with rotation around an axis （ the output deviation of Y-X， and Z-X）"

Fig.13

Output effect of symmetrical re sensing structure at different rotational speeds when rotating around an axis"

Fig.14

Experimental verification curve of the output effect of different angular accelerations on the symmetric weight sensing structure when rotating around the axis （using double row connecting components as an example）"

Table 2

Design and results of acceleration phase response surface test"

试验号

a转速/

（r·min-1）

b角加速度/

（r·min-2）

c总重/kg

S/

（mV·V-1）

1203009.40.007 41
2202405.90.003 73
3603009.40.007 43
4401805.90.003 81
5402409.40.007 46
64018012.90.011 16
74030012.90.010 87
8402409.40.007 46
9402409.40.007 46
10403005.90.003 9
11601809.40.007 51
122024012.90.010 74
13201809.40.007 51
14602405.90.003 98
15402409.40.007 46
16402409.40.007 46
176024012.90.010 90

Table 3

Response surface test analysis"

方差来源平方和自由度均方F值P值显著性
S/N=171.22R2adj=0.999 5R2=0.999 8
模型9.99E-0591.11E-052 040<0.000 1***
a2.31E-0812.31E-084.20.078 2*
b1.81E-0811.81E-083.30.111 3*
c9.98E-0519.98E-0518 340<0.000 1***
ab1.00E-1011.00E-100.0180.896*
ac2.03E-0912.03E-090.370.561*
bc3.61E-0813.61E-086.640.036 7**
a29.01E-0919.01E-091.660.239 1*
b21.11E-0811.11E-082.030.196 9*
c22.45E-0812.45E-084.50.071 6**
残差3.81E-0875.44E-09
失拟3.81E-0831.27E-08
误差040
总和9.99E-0516

Fig.15

Response surface diagram and contour of output peak at acceleration stage under interaction of speed， angular acceleration and total weight"

Fig.16

Response surface diagram of output peak at constant speed stage under the interaction of speed， angular acceleration and total weight"

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