Inspection Scope Vibration Testing for Small Powerplant Defects
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Solution Overview
Problem
Existing nondestructive inspection methods for internal defects in powerplant components are inadequate, particularly in detecting small defects with dimensions less than one hundred and fifty mils.
Innovation Solution
An inspection method and system using an inspection scope with an actuator and sensor to induce vibrations in powerplant components, measuring vibratory responses to detect defects, with frequencies equal to or greater than thirty kilohertz, and processing sensor data to identify defects smaller than one hundred and fifty mils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional nondestructive inspection methods are used, then the inspection process is simple, but the ability to detect small internal defects (less than 150 mils) is insufficient
Solution Approach 1:
The inspection scope uses an actuator to induce mechanical vibrations in the powerplant component at frequencies of 30 kHz or greater. These vibrations propagate through the component and are measured by a sensor to detect internal defects. The mechanical vibration principle enables detection of small defects (less than 150 mils) by analyzing changes in vibrational characteristics caused by defects, thereby improving measurement precision without requiring excessively complex equipment.
Solution Approach 2:
The inspection scope is designed as a nested structure where the actuator and sensor are housed within a compact scope that can be inserted into the powerplant interior. The scope itself nests within the powerplant component being inspected, allowing the inspection system to access internal areas without disassembly. This nesting principle maintains device compactness while achieving high defect detection capability.
2Measurement precision
If high-frequency vibrations (≥30 kHz) are used to detect small defects, then defect detection precision improves, but the complexity of the inspection system increases
Solution Approach 1:
The inspection system replaces complex mechanical scanning and contact methods with a non-contact vibration induction approach. The actuator generates high-frequency vibrations that propagate through the component, and the sensor detects these vibrations without mechanical contact. This substitution simplifies the measurement process while maintaining the ability to detect small defects at frequencies of 30 kHz or greater, reducing the difficulty of detection and measurement.
Solution Approach 2:
By utilizing mechanical vibration at high frequencies (≥30 kHz), the system achieves enhanced sensitivity to small defects. The vibration frequency is specifically selected to be above the natural frequencies of typical defects, allowing detection of defects as small as 50-150 mils. This principle enables high measurement precision while keeping the system relatively simple through the use of standard piezoelectric actuators and sensors.
3Productivity
If the inspection scope is inserted into the powerplant interior to inspect installed components, then inspection efficiency improves, but the complexity of positioning and maintaining contact increases
Solution Approach 1:
The inspection scope incorporates an anchor mechanism that allows the scope to self-position and self-secure within the powerplant interior. The anchor engages with the component being inspected or with surrounding structures, automatically maintaining the required contact between the actuator/sensor and the component surface. This self-service capability eliminates the need for external positioning equipment or manual adjustment during inspection, thereby improving productivity while managing positioning complexity.
Solution Approach 2:
The inspection scope is designed with pre-configured actuators and sensors positioned at the tip of the scope, ready for immediate contact with the component upon insertion. The anchor mechanism is pre-positioned to engage automatically at the inspection location, eliminating the need for complex real-time positioning adjustments. This preliminary arrangement of inspection elements improves inspection efficiency by allowing immediate data collection once the scope is inserted, while reducing the complexity of maintaining contact during the inspection process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables nondestructive detection of internal defects in powerplant components with dimensions as small as fifty mils, facilitating efficient inspection with minimal downtime and cost, even when the components are installed in an aircraft powerplant.
Implementation Method 1
Vibrations are induced in the component using the actuator. A vibratory response in the component excited by the vibrations is measured using a sensor
Implementation Method 2
The actuator may be configured as or otherwise include a piezoelectric device
Implementation Method 3
A vibratory response in the component excited by the vibrations is measured using a sensor to provide sensor data
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
An inspection method is provided during which a head (36) of an inspection scope (28) is inserted into an interior (26) of a powerplant (24). The head (36) of the inspection scope (28) is configured with an actuator (40). The powerplant (24) includes a component (22) within the interior (26) of the powerplant (24). The head (36) of the inspection scope (28) is arranged with the component (22). The arranging includes abutting the actuator (40) against the component (22) and fixing a position of the head (36) of the inspection scope (28) within the interior (26) of the powerplant (24) to maintain contact between the actuator and the component (22). Vibrations are induced in the component (22) using the actuator (40). A vibratory response in the component (22) excited by the vibrations is measured using a sensor (42) to provide sensor data. Presence of a defect (58) internal to the component (22) is identified based on the sensor data.