A Spring Function-sensing Conformal Displacement Measuring Device and Method for High Temperature Application

doi:10.12382/bgxb.2022.0672

Abstract

Abstract:

The displacement measurement of mechanical equipment is the key to state detection and motion control. Conventional displacement measurement methods based on the principles of laser, eddy current, electric resistance and inductance cannot cope with the challenges of displacement measurement in the compact test space of high-end equipment and harsh environmental conditions such as high temperature and oil contamination. A spring function-sensing conformal displacement measurement model is constructed based on material mechanics and spring structure. the overall spring force and displacement are analyzed, and the displacement-strain mapping relationship is determined. A strain-displacement model of the spring is established on the basis of the finite element method, and the effects of the sensitive point of spring displacement measurement, different group bridge forms, displacement excitation frequency and other factors are analyzed. The effectiveness and dynamic performance of spring function-sensing conformal displacement measuring devices is tested under frequency sweeping and heating conditions on an electro-hydraulic servo high-frequency impact test rig. The test results show that the test error is within 0.06mm when the loading frequency is 100Hz and below, and the high temperature adaptability is not below 275℃. Finally, it is verified by the application of high temperature brake test for automotive dry pad brakes. The dynamic displacement signal of the mechanism can still be obtained stably in real time above the operating temperature of 160℃, which provides embedded test technology support for high-temperature brake condition detection and its fault diagnosis. The conformal sensor has good linearity and accuracy under high temperature conditions, which provides an effective method for displacement measurement in compact space and harsh environments such as high temperature. Especially in the case of elastic elements such as springs, the embedded test without affecting the original system can be realized.

Key words: spring, displacement measurement, strain, high temperature, braking

CLC Number:

TH822

NING Keyan, ZENG Qiang, TIAN Jinshan, ZHAO Pan, LAN Hai, HE Jiafu, WAN Li. A Spring Function-sensing Conformal Displacement Measuring Device and Method for High Temperature Application[J]. Acta Armamentarii, 2024, 45(2): 662-670.

Figures/Tables 22

Fig.1 Spring

Fig.2 Simplified diagram of spring forces

Fig.3 Simplified diagram of spring hanger

Fig.4 Cloud diagram of spring strain

Fig.5 Strain-displacement linear fit of measuring point simulation

Fig.6 Wheatstone bridge

Fig.7 Spring function-sensing integrated measuring device

Table 1 Spring constraint modal frequency

阶数	1	2	3	4	5	6	7
频率/Hz	75.0	75.5	143.3	270.5	299.8	310.1	428.9

Fig.8 Spring constrained mode

Fig.9 Composition of verification system for spring function-sensing integrated displacement device

Fig.10 Material object picture

Fig.11 Spring strain-displacement fitting line

Fig.12 Spring high temperature calibration experimental results

Fig.13 Strain data with loading frequency range of 1-80Hz

Fig.14 Strain data with loading frequency range of 80-130Hz

Fig.15 Strain data with loading frequency range of 130-150Hz

Fig.16 Dynamic loading experiment verification

Table 2 Error analysis of spring dynamic load test

频率/Hz	20	50	100	110
误差/mm	-0.0477	-0.0585	0.0228	0.1265

Fig.17 System diagram of spring function-displacement measurement in high temperature braking test

Fig.18 Installation diagram of spring

Table 3 Continuous braking condition of brake

制动惯量/ (kg·m^-2)	制动初转速/ (r·min^-1)	制动末转速/ (r·min^-1)	制动减速度/ (m·s^-2)	制动周期/s
80	1620	694	2	60

Fig.19 Braking test data curve

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