Acceleration sensor heat protection sleeve for measuring structural vibration of flight test model
By using a thermal protection sleeve for the accelerometer made of solid aerogel material, the problems of accelerometer failure due to high temperature and signal attenuation were solved, enabling the sensor to work efficiently and measure accurately during flight tests.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2026-06-23
AI Technical Summary
In existing technologies, accelerometers installed on flight test models are prone to failure due to overheating, and the use of flexible insulation materials such as asbestos can lead to vibration signal attenuation or distortion, making it impossible to accurately measure the vibration characteristics of the structure.
An accelerometer thermal environment protection sleeve made of solid aerogel material or its composite material is designed with two protective sleeve flaps that fit tightly against the accelerometer and the model. Weak points are calculated to reduce heat conduction, ensuring that the sensor can work normally in high-temperature environments and maintain signal accuracy.
The survival time of the accelerometer in high-temperature environments has been improved, ensuring accurate acquisition of vibration data. Measurement accuracy is maintained by adjusting the stiffness of the protective sleeve, avoiding signal attenuation and overheating failure.
Smart Images
Figure CN224399414U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a thermal environment protection sleeve for an accelerometer used for vibration measurement of a flight test model structure, belonging to the field of aerospace engineering. Background Technology
[0002] During high-speed flight tests, it is necessary to measure the vibration characteristics of the structure, which requires measurement using accelerometers mounted on the structure. The standard practice for installing accelerometers for measuring mechanical vibrations during flight tests is either to mount them directly on the structure or to use flexible insulating materials such as asbestos on the accelerometers.
[0003] The existing model weights have the following problems:
[0004] (1) When a small-sized acceleration sensor is installed on a smaller flight test model component, the high temperature on the model is more likely to be conducted to the acceleration sensor, causing the sensor to overheat and fail.
[0005] (2) The elastic model of flexible thermal insulation materials such as asbestos is low. When the structural vibration signal is transmitted to the acceleration sensor, it will cause signal attenuation or distortion, and cannot reflect the true vibration characteristics of the structure. Utility Model Content
[0006] The technical problem to be solved by this utility model is to overcome the above-mentioned shortcomings of the existing technology and provide a thermal environment protection sleeve for an accelerometer used in the vibration measurement of a flight test model structure. This sleeve can protect the accelerometer used for structural vibration measurement during high-speed flight test, thereby achieving advantages such as increasing the sensor's survival time in the thermal environment and increasing the sensor's measurement accuracy.
[0007] The objective of this utility model is achieved through the following technical solution: a thermal environment protective sleeve for an accelerometer used for measuring vibration of a flight test model structure, comprising: two protective sleeve petals with identical structures, each protective sleeve petal having an accelerometer mounting groove on one side, the accelerometer mounting groove including an accelerometer head mounting groove and a sensor signal line groove; after the two protective sleeve petals are joined together, an accelerometer mounting cavity is formed inside, the accelerometer mounting cavity matching the outer contour of the accelerometer and signal line.
[0008] Furthermore, the protective sleeve is made of solid aerogel material or a composite material mainly composed of solid aerogel material.
[0009] Furthermore, the other side of each protective flap is a stepped surface.
[0010] Furthermore, the inner side of the protective sleeve is tightly fitted to the accelerometer, and the outer side is tightly fitted to the opening at the installation position of the protective sleeve on the specimen.
[0011] Furthermore, the thickness of the thinnest part of the protective sleeve is calculated based on the upper limit of the sensor's heat resistance temperature and the ambient heat flux, using the following formula:
[0012]
[0013] Where Q is the heat flux, k is the thermal conductivity coefficient of the aerogel material, A is the heat transfer area, ΔT is the temperature difference, and L is the heat transfer path length.
[0014] The advantages of this utility model compared with the prior art are:
[0015] (1) The present invention increases the survival time of the acceleration sensor during flight testing and can collect structural vibration data in a relatively harsh thermal environment.
[0016] (2) The stiffness of the protective sleeve of this utility model can be adjusted by adding composite materials, thereby ensuring the measurement accuracy of the acceleration sensor.
[0017] (3) The aerogel structure of this utility model has low thermal conductivity, and a thinner protective sleeve can improve the thermal protection characteristics of the structure. It can be applied to smaller models without affecting the real structural characteristics of the experimental model. Attached Figure Description
[0018] Figure 1 This is an internal view of the protective sleeve of this utility model;
[0019] Figure 2 This is an external view of the protective sleeve of this utility model;
[0020] Figure 3 Side view of the protective cover of this utility model Figure 1 .
[0021] Figure 4 Side view of the protective cover of this utility model Figure 2 . Detailed Implementation
[0022] The present invention will be described in conjunction with the accompanying drawings.
[0023] like Figures 1-4As shown, an accelerometer thermal environment protection sleeve for measuring vibration of a flight test model structure includes: two identical protective sleeve petals, each protective sleeve petal having an accelerometer mounting groove on one side, the accelerometer mounting groove including an accelerometer head mounting groove and a sensor signal line groove, and the other side being a stepped surface; after the two protective sleeve petals are joined together, the joined accelerometer head mounting groove and sensor signal line groove form an accelerometer mounting cavity, the accelerometer mounting cavity matching the outer contour of the accelerometer and signal line.
[0024] The protective sleeve is made of solid aerogel material or a composite material mainly composed of solid aerogel material.
[0025] The inner side of the protective sleeve is tightly fitted to the accelerometer, and the outer side is tightly fitted to the opening at the installation position of the protective sleeve on the specimen, avoiding any gaps or gaps.
[0026] The protective case has an opening for the data cable, making it easy to connect the data cable.
[0027] The thickness of the thinnest part of the protective sleeve needs to be calculated based on the upper limit of the sensor's heat resistance temperature and the ambient heat flux. The calculation method is as follows:
[0028]
[0029] Where Q is the heat flux, k is the thermal conductivity coefficient of the aerogel material, A is the heat transfer area, ΔT is the temperature difference, and L is the heat transfer path length.
[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.
Claims
1. A thermal environment protection sleeve for an accelerometer used for measuring vibration of a flight test model structure, characterized in that, include: Two identical protective sleeves are provided, with an acceleration sensor mounting groove on one side of each protective sleeve. The acceleration sensor mounting groove includes an acceleration sensor head mounting groove and a sensor signal line groove. After the two protective sleeves are joined together, an acceleration sensor mounting cavity is formed inside, and the acceleration sensor mounting cavity matches the outer contour of the acceleration sensor and signal line.
2. The thermal environment protection sleeve for an accelerometer used for vibration measurement of a flight test model structure according to claim 1, characterized in that: The protective sleeve is made of solid aerogel material or a composite material mainly composed of solid aerogel material.
3. The thermal environment protection sleeve for an accelerometer used for vibration measurement of a flight test model structure according to claim 1, characterized in that: The other side of each protective flap is a stepped surface.
4. The thermal environment protection sleeve for an accelerometer according to claim 1, characterized in that: The inner side of the protective sleeve is tightly fitted to the accelerometer, and the outer side is tightly fitted to the opening at the installation position of the protective sleeve on the specimen.
5. The thermal environment protection sleeve for an accelerometer according to claim 1, characterized in that: The thickness of the thinnest part of the protective sleeve is calculated based on the upper limit of the sensor's heat resistance temperature and the ambient heat flux. The calculation formula is as follows: Where Q is the heat flux, k is the thermal conductivity coefficient of the aerogel material, A is the heat transfer area, ΔT is the temperature difference, and L is the heat transfer path length.