A Comprehensive Review of Emerging Trends in Aircraft Structural Prognostics and Health Management
Abstract
:1. Introduction
2. Traditional Approaches to Aircraft SPHM
2.1. Overview of Traditional SPHM Approaches
- (1)
- Inspection and Maintenance Schedules: In these highly systematic and standardized procedures, technicians conduct meticulous physical examinations of aircraft structures at predetermined intervals [36,37]. The purpose of these checks is to identify any observable signs of structural degradation, such as corrosion, distortion, cracks, or even loose parts [38]. Given the fundamental nature of these inspections, they constitute the primary line of defense against possible structural failure, ensuring the aircraft’s physical condition is maintained at its optimal state.
- (2)
- Non-Destructive Testing (NDT): As the aviation industry evolved, the need for more sophisticated methods to inspect structural components without causing damage led to the widespread use of NDT techniques [39]. These encompass ultrasonic testing [40], radiographic testing [41], eddy current testing [42], magnetic particle inspection, and dye penetrant inspection. Through these methods, technicians can detect, locate, and measure defects that may not be visible to the naked eye, enhancing their ability to maintain structural integrity.
- (3)
- Usage Monitoring Systems (UMS): Traditional SPHM also includes the utilization of usage monitoring systems, which record various operational parameters such as load factors, airspeed, and temperature. These parameters, which are critical to understanding the performance and endurance of an aircraft’s structure, help in evaluating the health of the aircraft and its components [43,44].
- (4)
- Damage Assessment and Classification: Traditional SPHM methodologies involve manual evaluation and classification to ascertain the severity and type of damage or defects. Trained personnel visually inspect and categorize the damage according to set criteria, thereby prioritizing repairs based on the criticality of the identified issues [45,46,47].
- (5)
- Structural Health Monitoring (SHM): SHM is a fundamental part of traditional SPHM methodologies. Sensors placed at strategic locations monitor various parameters to provide data on structural behavior, allowing operators to detect any deviations from normal behavior, thereby ensuring continuous airworthiness [48,49,50,51].
- (6)
- Experience-based Decision making: Traditional SPHM methodologies often rely on the expertise of maintenance personnel to make informed decisions about inspections, repairs, or component replacements. Years of operational and maintenance experience underpin the assessment of aircraft structures and appropriate maintenance action [52,53,54].
2.2. Challenges and Limitations of Traditional SPHM Approaches
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- Reactive Maintenance Strategies and Scheduled Inspections: Traditional SPHM methodologies often hinge on reactive maintenance, with maintenance actions triggered by scheduled intervals or visible damage detection. This approach can lead to unforeseen failure and the potential for undetected early-stage damage, resulting in heightened costs and safety risks [55,56].
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- Limited Predictive Capabilities: Traditional methodologies may not accurately project the RUL of components or future degradation. Relying on historical data and scheduled maintenance may lack the necessary insights to optimize maintenance planning or identify critical structural issues [57].
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- Reliance on Human Judgment: Traditional SPHM methodologies heavily depend on maintenance personnel’s expertise and judgment. This dependence introduces variability and subjectivity in the decision-making process, which can affect the consistency and effectiveness of maintenance actions [58].
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- Concealed or Subsurface Damage: Traditional inspection methods may have difficulty detecting concealed or subsurface damage that is not apparent during routine inspections. Undetected defects beneath coatings or within complex structures could compromise the aircraft’s structural integrity [59].
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- Incomplete Exploitation of Advanced Data Analysis Approaches: Traditional SPHM methodologies may not fully harness the potential of state-of-the-art techniques for data analysis. The analysis of collected data might be restricted to basic trend analysis or manual assessment methods, which can impede the identification of subtle degradation patterns or anomalies [60].
2.3. Evolution from Traditional Methods to Modern Techniques
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- Advanced Diagnostics and Prognostics: Modern SPHM systems leverage advanced AI algorithms for the real-time analysis of sensor data. These tools provide superior capabilities for predicting and diagnosing potential structural issues well in advance, allowing for more timely maintenance and avoiding unexpected downtime [63].
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- Reduced Costs: By identifying potential problems early, allowing for predictive maintenance, and minimizing unplanned downtime, modern SPHM methods can lead to significant cost savings in aircraft operations and maintenance [64].
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- Real-time Insight: Modern SPHM techniques can handle and process large volumes of data from diverse sources and formats, generating comprehensive real-time insights into aircraft structural health [65].
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- Automation: Modern SPHM approaches offer a high degree of automation. Routine analysis, prognostics, and health reporting can be automated, reducing the possibility of human error and enhancing overall efficiency [66].
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- Adaptability: As opposed to traditional approaches, modern SPHM systems are adaptable to changing operational conditions and can learn from new data, continuously improving their predictive accuracy [67].
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- Enhanced Safety: By providing a more accurate understanding of the structural health of an aircraft, modern SPHM methods can significantly improve the safety of aircraft operations [68].
3. Modern SPHM Approaches to Aircraft SPHM
3.1. Data-Driven Approaches in SPHM
3.1.1. Introduction to Data-Driven Approaches
3.1.2. Machine Learning Approaches in SPHM
Case Study | Contribution | Application | Proposed Method | Pros and Cons | Ref. |
---|---|---|---|---|---|
Case 1 | Damage detection in CFRP-based aircraft composites using ERT | Aircraft composites | SVM, RF, KNN, and NN | Pros: Multiple damage types Cons: Did not perform full-scale validation | [85] |
Case 2 | Aircraft damage and personal injury assessment during approach and landing | Entire aircraft structure | SVM | Pros: Aircraft and passenger health injury assessment Cons: Categorical factors introduce complexity | [86] |
Case 3 | Aircraft skin damage identification using limited data | Entire aircraft structure | SVM | Pros: Efficient for limited data Cons: Tedious pre-processing and feature extraction | [87] |
Case 4 | Automated Impact Damage Detection Technique using Thermographic Image Processing | Aircraft fuselage | SVM | Pros: Autonomous approach Cons: Low accuracy | [88] |
Case 5 | A decision tree-based condition monitoring and prognosis for civil aircraft | A320 aircraft | DT | Pros: Includes both condition monitoring and prognosis Cons: Computational complexities | [89] |
Case 6 | A semi-supervised active learning approach for SHM in aircraft | Gnat aircraft wing dataset | Bagged DT | Pros: Did not consider supervised learning Cons: Model performance is low | [14] |
Case 7 | Aircraft structural damage due to bird strikes and evaluation of factors with highest contributions towards predicting aircraft damage | Aircraft structural damage using FAA National Wildlife Strike Database | RF, LR, and XGBoost | Pros: Evaluating factors that contribute to aircraft impact damage Cons: Model performance is low | [92] |
Case 8 | Acoustic emission-based impact damage detection of a thermoplastic composite aircraft elevator | Aircraft elevator component | RF | Pros: Use of thermoplastic resin Cons: Validation required on full-scale aircraft | [93] |
Case 9 | A proposed ML technique to identify aircraft sensor error and flight data rectification that reliably determines what, if any, problems are happening inside the pitot-static system | Flight data rectification and identification of aircraft sensor errors | KNN regression | Pros: Enhances aircraft system reliability and performance Cons: Feature selection process introduces complexity and high computational resources | [34] |
Case 10 | Damage detection of aircraft structures due to bird strikes | Aircraft structure extensive set of real bird strike data | NB, SVM, and DTs | Pros: An auto-pilot system for improved safety and decision making Cons: Very low model performance | [96] |
Case 11 | Aircraft corrosion detection using electromagnetic testing system | Corrosion at riveted joints in aircraft structures | NB, SVM, linear regression, RF, KNN | Pros: Considered corrosion at joints Cons: Requires validation on the actual aircraft joints corrosion | [97] |
3.1.3. Deep Learning Approaches in SPHM
3.1.4. Advantages and Limitations of Data-Driven Approaches
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- Adaptability and Learning Capability: Data-driven approaches excel in their ability to adapt and learn from large datasets. They leverage complex algorithms to uncover underlying patterns and relationships in the data, allowing them to handle a wide range of scenarios and adapt to dynamic operational conditions.
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- Prediction Accuracy: Given their capacity to process extensive datasets, data-driven techniques can significantly enhance prediction accuracy. By analyzing diverse operational data, these methods can offer valuable insights into system behavior, aiding in the proactive identification of potential failures.
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- Scalability: The power of data-driven approaches lies in their scalability. They can effectively handle large volumes of data from diverse sources, making them particularly suitable for complex systems like modern aircraft.
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- Data Quality and Availability: The effectiveness of data-driven approaches largely depends on the quality and quantity of available data. They require substantial amounts of high-quality data to train and validate their models, which can be a challenge in certain environments.
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- Model Transparency: Data-driven methods, particularly those utilizing deep learning algorithms, often function as “black boxes”. It can be challenging to interpret their inner workings, which may hinder understanding and trust in their predictions.
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- Computational Requirements: These methods can be computationally intensive, requiring substantial processing power and storage capacity. This might limit their application in settings with constrained computational resources.
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- Generalizability: While data-driven approaches can adapt and learn from the data they are trained on, they may struggle to generalize their learnings to new, unseen scenarios. This can pose challenges in a field as dynamic and unpredictable as SPHM.
3.2. Model-Based Approaches in SPHM
3.2.1. Introduction to Model-Based Approaches
3.2.2. Implementation and Application of Model-Based Approaches in SPHM
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- Accurate Representation: Model-based approaches provide an accurate representation of the underlying system by incorporating domain knowledge, physical principles, and mathematical equations. They capture the fundamental relationships and dynamics of the system, resulting in accurate predictions and interpretations.
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- Interpretable Results: Model-based approaches offer interpretability, allowing users to understand the underlying mechanisms and factors influencing the predictions. The explicit mathematical equations and parameters provide insights into the relationships between input variables and the predicted outcomes.
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- Generalizability: Model-based approaches have the advantage of generalizability. When a model is developed and validated, it can be applied to different scenarios and conditions within the specified range of validity. This enables the transferability of knowledge and predictions to similar systems or applications.
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- Insightful Analysis: Model-based approaches facilitate in-depth analysis and understanding of the system’s behavior. Sensitivity analysis, parameter estimation, and model validation techniques can be employed to assess the impact of different factors, optimize system performance, and gain insights into system dynamics.
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- Assumptions and Simplifications: Model-based approaches depend on assumptions and simplifications to capture system dynamics. These assumptions may not fully represent the complexity and variability of real-world scenarios, leading to limitations in prediction accuracy and applicability.
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- Limited Adaptability: Model-based approaches can be less adaptable to changing conditions or situations that were not considered during the model’s development. They are often built based on specific assumptions and may not account for unforeseen events or variations outside the scope of the model.
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- Computational Complexity: Developing and implementing model-based approaches can be computationally intensive, especially for complex systems with numerous variables and interactions. The need to solve mathematical equations and perform numerical simulations can result in longer processing times and resource requirements.
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- Model Uncertainty: Model-based approaches are subject to inherent uncertainties stemming from model assumptions, parameter estimation, and model structure. These uncertainties can propagate and affect the accuracy and reliability of predictions. Quantifying and managing model uncertainty is a critical challenge in model-based prognostics.
3.3. Hybrid Approaches in Aircraft SPHM
3.3.1. Introduction to Hybrid Approaches
3.3.2. Implementation and Application of Hybrid Approaches in SPHM
3.3.3. Advantages and Limitations of Hybrid Approaches
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- Enhanced Accuracy: Hybrid approaches combine the strengths of physics-based models and data-driven techniques, resulting in improved accuracy and predictive capabilities. They leverage both physical principles and historical data to make more reliable predictions.
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- Flexibility and Adaptability: Hybrid approaches can accommodate varying levels of data availability and system complexity. They allow for the incorporation of additional data sources and the adjustment of models as new information becomes available, making them adaptable to changing conditions.
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- Robustness to Uncertainties: By integrating physics-based models and data-driven techniques, hybrid approaches can handle uncertainties and variations more effectively. They can account for unknown factors and provide more robust predictions in scenarios where either approach alone may fall short.
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- Increased Complexity: Implementing hybrid approaches can be more complex than using a single modeling technique. It requires expertise in both physics-based modeling and data analysis, as well as careful integration of the two approaches.
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- Data Quality and Availability: Hybrid approaches strongly depend on the accuracy and accessibility of data. Insufficient or inaccurate data can impact the performance and reliability of hybrid models.
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- Model Interpretability: Hybrid models might sacrifice some interpretability compared to purely physics-based models. The incorporation of data-driven techniques can introduce black-box elements, making it challenging to understand the reasoning behind predictions.
4. Digital Twin Technology in SPHM
5. Future Trends in SPHM
- (1)
- Further Integration of AI
- ✓
- The integration of AI is revolutionizing SPHM by enabling more advanced data analysis, pattern recognition, and decision-making capabilities. These technologies have the potential to significantly enhance the accuracy, efficiency, and reliability of structural health monitoring, diagnosis, and prognostics.
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- AI excels at processing vast amounts of sensor data in real-time, allowing for the identification of subtle patterns and anomalies that may indicate potential structural issues. By continuously learning from historical and real-time data, these algorithms can improve their predictive capabilities, enable proactive maintenance, and reduce the risk of unexpected failure.
- ✓
- Moreover, the integration of AI with SPHM systems paves the way for automated decision-making processes, including automated decision making using reinforcement learning. This approach allows maintenance schedules to be optimized, component lifetimes to be predicted, and resources to be effectively allocated. By automating these tasks through reinforcement learning, aircraft operators can improve operational efficiency, reduce costs, and enhance overall safety.
- (2)
- Wider Adoption of Digital Twin Technology
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- Digital twin technology, which involves creating a virtual replica of an aircraft’s physical components and systems, offers immense potential for SPHM. By combining real-time sensor data with the virtual twin, engineers and maintenance personnel can gain a comprehensive understanding of the aircraft’s current and future health.
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- Digital twins provide a platform for simulating and predicting the behavior of an aircraft under various operating conditions and stress scenarios. This enables proactive maintenance planning and the identification of potential structural issues before they manifest in the physical aircraft. Additionally, digital twins facilitate virtual testing and optimization of maintenance procedures, leading to more efficient and effective maintenance operations.
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- Wider adoption of digital twin technology is expected to significantly improve aircraft safety, reduce maintenance costs, and increase operational availability. By leveraging the insights gained from the virtual twin, operators can make informed decisions, optimize maintenance schedules, and perform condition-based maintenance, ultimately extending the lifespan of critical components and enhancing overall operational reliability.
- (3)
- Advancements in Sensor Technologies
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- The continuous advances in sensor technologies play a pivotal role in enhancing SPHM capabilities. Sensors are the backbone of SPHM systems, providing the necessary data for real-time monitoring, analysis, and decision making.
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- Future trends in sensor technologies include the development of miniaturized sensors, wireless sensor networks, and smart sensor technologies. Miniaturized sensors can be embedded within the aircraft’s structural components, enabling continuous monitoring of critical parameters such as strain, temperature, and vibration. This provides a more comprehensive and accurate picture of the structural health of the aircraft.
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- Wireless sensor networks allow for seamless data collection and transmission, providing real-time updates on the structural health of an aircraft. These enable timely decision making and facilitate a proactive approach to maintenance. Smart sensors, equipped with advanced data processing capabilities, can perform on-site analysis and decision making, reducing the need for extensive data transmission, and allowing for rapid response to critical events.
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- These advances in sensor technologies enable more precise and comprehensive monitoring of aircraft structures, facilitating the early detection of potential issues and enabling timely maintenance interventions. By leveraging these advanced sensors, operators can enhance the overall reliability, safety, and performance of their aircraft.
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Abbreviations
SPHM | Structural Prognostics and Health Management |
SVM | Support Vector Machine |
RF | Random Forest |
CNN | Convolutional Neural Network |
CAE | Convolutional Autoencoder |
RUL | Remaining Useful Life |
NDT | Non-destructive testing |
UMS | Usage Monitoring Systems |
SHM | Structural Health Monitoring |
AI | Artificial intelligence |
ML | Machine learning |
DL | Deep learning |
DTs | Decision trees |
KNN | K-nearest neighbor |
NB | Naïve Bayes |
CFRP | Carbon fiber reinforced polymer |
ERT | Electrical resistance tomography |
RBF | Radial basis function |
PT | Pulsed thermography |
TUL | Total useful life |
GA | Genetic algorithm |
LR | Logistic regression |
AE | Acoustic emission |
ANN | Artificial neural network |
DNN | Deep neural networks |
LSTM | Long short-term memory |
RNN | Recurrent neural network |
DBN | Deep belief networks |
PNN | Probabilistic neural networks |
FCN | Fully connected network |
SAE | Stacked autoencoder |
DAE | Deep autoencoder |
DAIS | D-Sight Aircraft Inspection System |
CM | Condition Monitoring |
EKF | Extended Kalman filter |
SIFs | Stress intensity factors |
SKF | Switching Kalman Filter |
FEAM | Finite Element Alternating Method |
VRAMS | Virtual Risk-Informed Agile Maneuver Sustainment |
MLS | Moving Least Squares |
DIC | Digital Image Correlation |
BGOA | Binary grasshopper optimization algorithm |
EANNs | Ensemble artificial neural networks |
DR-RNN | Deep residual recurrent neural networks |
ANHHSMM | Adaptive Non-Homogenous Hidden Semi Markov Model |
NHHSMM | Non-Homogenous Hidden Semi Markov Model |
MCC-DT | Measurement-computation combined digital twin |
MFS | Multi-fidelity surrogate |
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Case Study | Contribution | Application | Proposed Method | Pros and Cons | Ref. |
---|---|---|---|---|---|
Case 1 | An ANN model has been used to identify the strain at different locations on aircraft using 40 parameters. | Aircraft structure | ANN | Pros: Improves the maintenance process for aircraft Cons: Low performance due to unoptimized model | [31] |
Case 2 | Integration of various methods to monitor and identify defects in aircraft structures. | Aircraft structure | ARTMAP -Fuzzy- Wavelet ANN | Pros: Hybrid method for better performance Cons: Model is validated only on the simulation data | [106] |
Case 3 | ANN and its ensemble network classifiers are established for guided wave-based damage detection in aircraft with small-scale and long-term full-scale fatigue experiments | Military turboprop aircraft PZL Orlik TC II | ANN and ensemble network | Pros: High model accuracy Cons: The limitations in training data availability and computation time may pose restrictions on using the proposed method for large aircraft | [107] |
Case 4 | Based on the wing structure’s actual mechanical properties, the fifteen damage patterns were simulated using the aircraft wing structure FE model | Aircraft Wing | PNN | Pros: Multiple damage cases considered Cons: The method requires careful consideration of dissymmetry, geometry, and natural frequency changes, and further research is needed to address these complexities | [108] |
Case 5 | Deep Belief Networks (DBNs) were used to present a unique multi-sensor health detection technique | Aircraft Wing | DBN | Pros: Multi-sensory data Cons: Model performance needs improvement | [109] |
Case 6 | Defect classification of honeycomb-based aircraft structures using infrared thermography | Aircraft structure | LSTM-RNN | Pros: Autonomous process Cons: Performance is highly dependent on the accuracy and resolution of the infrared thermography data in practical applications | [110] |
Case 7 | Ultrasonic guided wave-based damage imaging using a 1D-CNN model applied to a skin-stinging composite aircraft panel | Aircraft panel | CNN | Pros: Multiple damage cases considered Cons: Model did not consider environmental factors | [113] |
Case 8 | The proposed CNN-based data-driven SHM technique is assessed using strain data from a numerical model, visualizing a network of 324 sensors at the skin-rib joints of an aircraft composite wing under different flight loads | Composite wing skin-rib joints | CNN | Pros: The use of multiple data sources (load and strain data) and noise considerations make the model well suited for real aircraft structures Cons: Model functionality is not interpretable and unable to predict damage location | [114] |
Case 9 | RF and deep learning-based impact damage detection and localization using AE | Aircraft elevator component | RF and SAE | Pros: Includes damage localization Cons: The validation is based on laboratory environment, and further validation on actual aircraft structures is needed | [116] |
Case 10 | A new framework based on deep learning was developed and deployed to characterize crack damage in aircraft composite | Thick multi-layer composite sub-elements used in aircraft applications | DAE | Pros: Unsupervised problem Cons: Did not optimize model for better performance | [117] |
Case 11 | Application of lamb waves and deep transfer learning to multi-level damage classification for aircraft plate structure | Aircraft plate structure | Deep transfer learning | Pros: Multi-level damage with limited data Cons: The applicability and generalization of the technique to different types of aircraft plate structures need investigation | [118] |
Case 12 | Aircraft fuselage corrosion detection using deep transfer learning models such as InceptionV3 and DenseNet | DAIS photos from various Boeing and Airbus aircraft lap joints | InceptionV3 and DenseNet | Pros: Effective for limited data Cons: The effectiveness of the approach may depend on the availability and diversity of corrosion images for transfer learning | [16] |
Case Study | Contribution | Application | Proposed Method | Pros and Cons | Ref. |
---|---|---|---|---|---|
Case 1 | Studies the effect of model parameters uncertainties on fatigue crack growth | Aircraft fuselage | Paris’ law with EKF | Pros: Accurate predictions Cons: Biased initial estimate | [24] |
Case 2 | Proposes a dynamic probability modeling-based aircraft SHM framework | Aircraft structures | Gaussian Mixture Model | Pros: Reliable monitoring of cracks Cons: Potentially adding complexity | [121] |
Case 3 | Investigates the use of condition monitoring data for predicting RUL | Aircraft systems | SKF | Pros: Suitability for practical decision making Cons: Increased computational resource | [120] |
Case 4 | Proposes an approach that combines high-performance fatigue mechanics with filtering theories | Aerospace structures | FEAM and the MLS law | Pros: Effective estimation of RUL Cons: Challenges in terms of implementation and scalability | [127] |
Case 5 | Introduces new methods for uncertainty management in failure prognosis using particle filters | Aircraft structures | EKF approach | Pros: Reduced uncertainty, reduced computational burden Cons: Dependent on the availability and quality of the data used | [122] |
Case 6 | Proposes a framework for assessing the safety and efficiency of aircraft maintenance strategies | Aircraft components | Agent-based modeling and Monte Carlo simulation | Pros: Reduction in inspection frequency Cons: accuracy dependent on the quality and availability of the data | [128] |
Case 7 | Creates a realistic dataset with run-to-failure trajectories | Aircraft engine | Aero-Propulsion System Simulation Model | Pros: Availability of representative run-to-failure dataset Cons: Dataset limitations in terms of its generalizability | [129] |
Case 8 | Introduces the integration of multiple sensors to enhance prediction accuracy | Turbo fanengine | Kalman Filter | Pros: Enhanced prediction accuracy Cons: Increased complexity, Cost implications | [126] |
Case 9 | Develops a model-based fault detection | Aircraftcontrolsurfaces | GA | Pros: Early detection, Precision Cons: Complexity, Limited field data | [130] |
Case 10 | Develops a PHM functional architecture for aircraft avionics systems using a model-based system engineering design approach. | Aircraftavionicssystems | Harmony SE Model-based System | Pros: Systematic development guidance, Simulation-capable Cons: Complexity | [131] |
Case Study | Contribution | Application | Proposed Method | Pros and Cons | Ref. |
---|---|---|---|---|---|
Case 1 | Improved prediction using physics-based learning | Boeing 747-100 aircraft dynamics | Residual function-based implicit integration scheme | Pros: Improved prediction Cons: Potential complexity. | [133] |
Case 2 | Hybrid approach to predict the crack growth | Aircraft wings | Paris law with RVM model | Pros: Increased accuracy and precision of prognosis model Cons: Only one (Al) material is considered. | [134] |
Case 3 | Corrosion-fatigue of aircraft wings using physics-informed neural network | Aircraft wing | Integration of Walker model for fracture propagation with neural network | Pros: Accurate modeling of cumulative damage Cons: Limited output observations may reduce model precision | [135] |
Case 4 | Development of an adaptive data-driven prognostic approach | Aircraft composite structures | ANHHSMM | Pros: Improved RUL estimation, Robustness Cons: Data noise, computational complexity | [136] |
Case 5 | Probabilistic model for residual strength assessment for aircraft composite panels via a hybrid approach using guided waves | Aircraft composite panel | FE model and an error quantification and propagation program | Pros: Improved residual strength estimation Cons: Relatively high MAPWE | [137] |
Data-Driven | Model-Based | Hybrid Methods | |
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Advantages |
|
|
|
Limitations |
|
|
|
Case Study | Contribution | Application | Proposed Method | Pros and Cons | Ref. |
---|---|---|---|---|---|
Case 1 | A digital-twin-assisted damage diagnosis of aircraft sandwich structures using low- and high-fidelity modeling | Aircraft sandwich structures | High-fidelity and low-fidelity FE model | Pros: Comprehensive numerical modeling Cons: The study did not address the influence of strain rate and impact conditions, limiting a comprehensive understanding of the model’s performance under different scenarios | [138] |
Case 2 | A versatile airframe fatigue crack propagation-based digital twin model for aircraft wing health monitoring using a dynamic Bayesian network | Aircraft wing | Dynamic Bayesian network | Pros: Integrating various uncertainty sources and handling both discrete and continuous variables improved the model’s application to actual aircraft Cons: All results are based on simulation, with no validation | [62] |
Case 3 | A digital twin model for composite single-stringer panels for an aeronautical structure under compressive loading | Aircraft panel | Surrogate mathematical model | Pros: Data-driven model that did not require comprehensive physical understanding Cons: Uncertainty in input data, modeling techniques, and environmental conditions can lead to uncertainty in the model’s predictions | [141] |
Case 4 | Integration of sensor measurements and FEM to build a digital twin model | Aircraft wing | DNN, CNN, and ResNet | Pros: Integration of multiple technologies and methods helps improve the model’s reliability Cons: Structural analysis is considered only in the elastic range, without incorporating any uncertainties | [142] |
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Khalid, S.; Song, J.; Azad, M.M.; Elahi, M.U.; Lee, J.; Jo, S.-H.; Kim, H.S. A Comprehensive Review of Emerging Trends in Aircraft Structural Prognostics and Health Management. Mathematics 2023, 11, 3837. https://doi.org/10.3390/math11183837
Khalid S, Song J, Azad MM, Elahi MU, Lee J, Jo S-H, Kim HS. A Comprehensive Review of Emerging Trends in Aircraft Structural Prognostics and Health Management. Mathematics. 2023; 11(18):3837. https://doi.org/10.3390/math11183837
Chicago/Turabian StyleKhalid, Salman, Jinwoo Song, Muhammad Muzammil Azad, Muhammad Umar Elahi, Jaehun Lee, Soo-Ho Jo, and Heung Soo Kim. 2023. "A Comprehensive Review of Emerging Trends in Aircraft Structural Prognostics and Health Management" Mathematics 11, no. 18: 3837. https://doi.org/10.3390/math11183837
APA StyleKhalid, S., Song, J., Azad, M. M., Elahi, M. U., Lee, J., Jo, S.-H., & Kim, H. S. (2023). A Comprehensive Review of Emerging Trends in Aircraft Structural Prognostics and Health Management. Mathematics, 11(18), 3837. https://doi.org/10.3390/math11183837