1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China 2. Shien-Ming Wu School of Intelligent Engineering, South China University of Technology, Guangzhou 511442, China 3. Guangdong Artificial Intelligence and Digital Economy Laboratory (Guangzhou), Guangzhou 510335, China
One of the core challenges of intelligent fault diagnosis is that the diagnosis model requires numerous labeled training datasets to achieve satisfactory performance. Generating training data using a virtual model is a potential solution for addressing such a problem, and the construction of a high-fidelity virtual model is fundamental and critical for data generation. In this study, a digital twin-assisted dynamic model updating method for fault diagnosis is thus proposed to improve the fidelity and reliability of a virtual model, which can enhance the generated data quality. First, a virtual model is established to mirror the vibration response of a physical entity using a dynamic modeling method. Second, the modeling method is validated through a frequency analysis of the generated signal. Then, based on the signal similarity indicator, a physical–virtual signal interaction method is proposed to dynamically update the virtual model in which parameter sensitivity analysis, surrogate technique, and optimization algorithm are applied to increase the efficiency during the model updating. Finally, the proposed method is successfully applied to the dynamic model updating of a single-stage helical gearbox; the virtual data generated by this model can be used for gear fault diagnosis.
Cosine similarity between virtual and experimental signals
fn1, fn2
Rotation frequencies of input and output gears, respectively
fz
Mesh frequency
g
gth iteration
h(t)
Transfer function of the gearbox
k
Number of sensitive model parameters
K
Contact stiffness
L
Number of sample points
M
Number of mode order
n
Number of parameters
p
Model parameters in the dynamic model
pL
Lower bound of the model parameters
ps
Sensitive model parameters
psL
Lower bound of the sensitive model parameters
psU
Upper bound of the sensitive model parameters
pU
Upper bound of the model parameters
r1, r2
Equivalent radius
rij
Distance between fireflies i and j
R2
Coefficient of determination
R(p)
Difference between the generated and physical signals
t1
Normalized contact stiffness
t2
Normalized contact damping coefficient
t3
Normalized force exponent
Vdt
Dynamic transonic speed
Vst
Static transonic speed
X
Variable matrix of sampling points
Xe
Physical signal in the time domain
Xg
Generated signal in the time domain
Mean value of the simulation response
yi
Result of sample point i based on the complex simulation model
Result of sample point i based on the constructed surrogate model
y(t)
Vibration response
Y
Response vector of sampling points
z1
Tooth number of the driving gear
z2
Tooth number of the driven gear
α
Random parameter that controls movement randomization
β
Unknown coefficient vector
β0
Attractiveness factor
ε
Error vector
γ
Brightness absorption coefficient
ν1, ν2
Poisson’s ratios of the gears
θ1
Phase of the exciting force
Phase of the vibration response
ρ
Density of gears
Random vector (k-dimensional)
1
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