A three-axis accelerometer in-situ test system based on modular fixture

Abstract

This invention provides an in-situ testing system for triaxial accelerometers based on modular fixtures, belonging to the field of sensor testing technology. The system includes: a modular fixture unit for clamping the accelerometer under test; a multi-degree-of-freedom adjustment device for adjusting the spatial attitude of the accelerometer; a centrifuge unit for generating centrifugal acceleration loads; and a data acquisition and control system for driving the centrifuge unit and the multi-degree-of-freedom adjustment device, acquiring the triaxial output signals of the accelerometer under test, and calculating in-situ test parameters based on the acquired signals. The testing system features modular fixture units, which improves testing efficiency by allowing for easy module replacement within minutes. It also enables parallel testing of multiple accelerometers, significantly increasing testing throughput.

Description

Technical Field

[0001] This utility model belongs to the field of sensor testing technology, specifically relating to an in-situ testing system for a triaxial accelerometer based on a modular fixture. Background Technology

[0002] Traditional accelerometer testing systems suffer from the following problems: a) Poor compatibility: Different accelerometer models require dedicated fixtures, making replacement cumbersome and costly; b) Low degree of freedom: Some traditional testing systems have relatively fixed mechanical structures, making it impossible to flexibly adjust the attitude and motion mode, thus limiting the degree of freedom in testing; c) Low testing efficiency: Traditional fixtures only support a single fixed attitude, requiring repeated disassembly and adjustment, which is time-consuming and prone to introducing errors; d) Insufficient dynamic calibration capability: It is difficult to simulate complex working conditions (such as multi-axis vibration and centrifugal force), and in-situ dynamic testing cannot be achieved. Based on these problems, traditional accelerometer testing systems struggle to meet the needs of current technology.

[0003] Therefore, there is an urgent need for a system with strong compatibility that supports in-situ dynamic testing with multiple degrees of freedom. Summary of the Invention

[0004] The purpose of this invention is to provide a modular and reconfigurable in-situ testing system for triaxial accelerometers, which enables multi-model compatibility through quick-change fixture modules and combines a high-precision motion platform to complete complex working condition simulation and dynamic calibration.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an in-situ testing system for a triaxial accelerometer based on a modular fixture, the system comprising:

[0006] Modular fixture unit for clamping the accelerometer to be tested;

[0007] A multi-degree-of-freedom adjustment device is used to adjust the spatial attitude of the accelerometer under test.

[0008] Centrifuge unit, used to generate centrifugal acceleration load;

[0009] The data acquisition and control system is used to drive the centrifuge unit and the multi-degree-of-freedom adjustment device, acquire the triaxial output signals of the accelerometer under test, and calculate the in-situ test parameters based on the acquired signals.

[0010] The in-situ testing system for triaxial accelerometers based on modular fixtures provided by this utility model also has the following technical features: the modular fixture unit includes a base module, an adapter module, and a locking mechanism; the adapter module is used to adapt to different models of accelerometers to be tested.

[0011] The triaxial accelerometer in-situ testing system based on modular clamps provided by this utility model also has the following technical feature: after the base module and the adapter module are positioned by positioning pins, they are automatically attracted and fixed by a magnetic locking mechanism.

[0012] The in-situ testing system for triaxial accelerometers based on modular fixtures provided by this utility model also has the following technical feature: the adapter module is rigidly fixed to the accelerometer to be tested, and the rigid fixing includes a connection method selected from bolt connection, magnetic locking and snap-fit ​​connection.

[0013] The in-situ testing system for a triaxial accelerometer based on a modular fixture provided by this utility model also has the following technical features: the multi-degree-of-freedom adjustment device includes a linear displacement stage and a triaxial rotary table fixed on the linear displacement stage.

[0014] The in-situ testing system for a triaxial accelerometer based on a modular fixture provided by this utility model also has the following technical features: the data acquisition and control system is equipped with a power supply interface and a test interface.

[0015] Beneficial effects:

[0016] The in-situ testing system for triaxial accelerometers based on modular fixtures provided in this application has modular fixture units. In terms of testing efficiency, it is easy to change fixtures, and the module can be replaced in a few minutes. It can also test multiple accelerometers in parallel, which greatly improves the testing throughput.

[0017] The in-situ testing system for triaxial accelerometers based on modular fixtures provided in this application has a multi-degree-of-freedom adjustment device, which can accurately simulate actual working conditions, perform multi-dimensional testing, and discover potential performance defects.

[0018] The in-situ testing system for triaxial accelerometers based on modular fixtures provided in this application can be adapted to various models, reducing equipment investment. The modular structure also significantly reduces maintenance costs. The system has strong scalability, making it easy to add new functional modules, and can quickly adapt to new technologies and standards, extending its service life. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural block diagram of the in-situ testing system for a triaxial accelerometer based on a modular fixture provided in this embodiment of the invention.

[0021] Among them, 1: centrifuge unit; 2: multi-degree-of-freedom adjustment device; 3: accelerometer under test; 4: modular fixture unit; 5: test cable; 6: data acquisition and control system; 7: power supply interface; 8: test interface. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent transformations or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0023] In the description of the embodiments of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model.

[0024] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0026] like Figure 1 As shown, this utility model embodiment provides an in-situ testing system for a triaxial accelerometer based on a modular fixture, the system comprising:

[0027] Modular fixture unit 4 is used to clamp the accelerometer 3 to be tested;

[0028] The multi-degree-of-freedom adjustment device 2 is used to adjust the spatial attitude of the accelerometer 3 under test;

[0029] Centrifuge unit 1 is used to generate centrifugal acceleration load;

[0030] The data acquisition and control system 6 is used to drive the centrifuge unit 1 and the multi-degree-of-freedom adjustment device 2, and to acquire the triaxial output signals of the accelerometer 3 under test, and to calculate the in-situ test parameters based on the acquired signals.

[0031] In some embodiments, the modular fixture unit 4 includes a base module, an adapter module, and a locking mechanism. The adapter module is used to adapt to different models of accelerometers to be tested.

[0032] In some embodiments, the base module and the adapter module are positioned by positioning pins and then automatically attracted and fixed by a magnetic locking mechanism.

[0033] In some embodiments, the adapter module is rigidly fixed to the accelerometer 3 under test, and the rigid fixing includes a connection method selected from bolt connection, magnetic locking and snap-fit ​​connection.

[0034] In some embodiments, the multi-degree-of-freedom adjustment device 2 includes a linear displacement stage and a three-axis rotary stage fixed on the linear displacement stage.

[0035] In some embodiments, the data acquisition and control system 6 is provided with a power supply interface 7 and a test interface 8.

[0036] The working principle of the testing system provided in the above embodiments is as follows:

[0037] Based on the specifications and model of the accelerometer 3 to be tested, a suitable modular fixture unit 4 is selected. These modular fixture units 4 have standardized interfaces and can be combined through small patches, bolt connections, or quick-plug installation to form a stable and fixed structure that fits the shape and installation requirements of the accelerometer. For example, for miniaturized accelerometers without independent mounting holes, a patch-type mounting fixture module (≤10mm×10mm) is selected. Made of aluminum alloy, it features a high-precision planar groove machined on the bottom surface, secured by vacuum adsorption, and covered with an elastic pressure plate (with countersunk bolt holes) on top to ensure a tight fit between the patch and the module plane. For accelerometers with threaded mounting holes, a fixture module with a threaded interface is selected. The threaded adapter bracket is L-shaped, with a threaded hole matching the accelerometer on one end and a waist-shaped adjustment groove on the other end, allowing for adjustable bolt spacing. For accelerometers with U-shaped slots or elastic clips on the housing surface, a quick-plug interface fixture module is selected. The module's side is machined with a boss guide rail matching the slot, and an internal spring pin is installed. After insertion, it is locked by a top knob.

[0038] The assembled modular fixture unit 4 is installed onto the multi-degree-of-freedom adjustment device 2. The multi-degree-of-freedom adjustment device 2 works in conjunction with the centrifuge unit 1 to ensure accurate simulation of various motion conditions required by the accelerometer. The accelerometer 3 to be tested is connected to the data acquisition and control system 6 via a test cable. The data acquisition and control system 6 is set with appropriate data acquisition frequency and accuracy. The control system software is installed, and programming enables precise control of the motion parameters of the test platform, as well as real-time data acquisition, storage, and analysis.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A triaxial accelerometer in-situ testing system based on a modular fixture, characterized in that, The system includes: Modular fixture unit for clamping the accelerometer to be tested; A multi-degree-of-freedom adjustment device is used to adjust the spatial attitude of the accelerometer under test. Centrifuge unit, used to generate centrifugal acceleration load; The data acquisition and control system is used to drive the centrifuge unit and the multi-degree-of-freedom adjustment device, acquire the triaxial output signals of the accelerometer under test, and calculate the in-situ test parameters based on the acquired signals.

2. The in-situ testing system for a triaxial accelerometer based on a modular fixture according to claim 1, characterized in that, The modular fixture unit includes a base module, an adapter module, and a locking mechanism. The adapter module is used to adapt to different models of accelerometers to be tested.

3. The in-situ testing system for a triaxial accelerometer based on a modular fixture according to claim 2, characterized in that, The base module and the adapter module are positioned by positioning pins and then automatically attached and fixed by a magnetic locking mechanism.

4. The in-situ testing system for a triaxial accelerometer based on a modular fixture according to claim 2, characterized in that, The adapter module is rigidly fixed to the accelerometer under test, and the rigid fixing includes a connection method selected from bolt connection, magnetic locking and snap-fit ​​connection.

5. The in-situ testing system for a triaxial accelerometer based on a modular fixture according to claim 1, characterized in that, The multi-degree-of-freedom adjustment device includes a linear displacement stage and a three-axis rotary stage fixed on the linear displacement stage.

6. The in-situ testing system for a triaxial accelerometer based on a modular fixture according to claim 1, characterized in that, The data acquisition and control system is equipped with a power supply interface and a test interface.

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