Simultaneous identification of multi-point random load test platform and test method

Abstract

The invention discloses a test platform and a test method for simultaneously identifying multi-point random loads, belonging to the technical field of load identification. It solves the problem of large errors in the identification results of loads caused by improper selection of response measuring points. The excitation signal output end of the signal generator of the test platform is connected to the excitation signal input end of the power amplifier, and the excitation signal output end of the power amplifier is connected to the excitation signal input end of the vibrator. On multiple stimulated points of the recognition system, the multiple stimulated points are determined according to the relative position of the load point to be recognized, a force sensor is set at each stimulated point of the recognition system, and multiple presets on the recognition system An acceleration sensor is respectively arranged at a predetermined evenly distributed response point, and the number of the response point is more than the number of the stimulated point. The test method uses the aforementioned test platform to realize the identification of random loads. The invention is suitable for identifying random loads.

Description

technical field

[0001] The invention relates to a test platform and a test method for simultaneously identifying multi-point random loads, belonging to the technical field of load identification. Background technique

[0002] Load identification is to calculate the dynamic load of the system based on the dynamic characteristics of the known structure and the measured dynamic response. It is the basis of structural dynamic modification and structural dynamic sensitivity analysis. These two technologies are the key points of the combination of modal analysis, finite element analysis and computer-aided design (CAD), and are also an important part of computer-aided engineering (CAE).

[0003] Load identification technology also provides an effective method of identifying dynamic loads for structural systems where direct load measurement is not possible. For example, during the flight of the aircraft, the components in the nuclear reactor also vibrate when they are working, and ...

Examples

specific Embodiment approach 1

[0023] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the test platform for simultaneously identifying multi-point random loads described in this embodiment includes an identification system 1, and it also includes a signal generator 2, a power amplifier 3, an exciter 4, an acceleration sensor 5 and a force sensor 6 ,

[0024] Signal generator 2 is used for generating white noise excitation, and the excitation signal output end of signal generator 2 is connected the excitation signal input end of power amplifier 3, and the excitation signal output end of power amplifier 3 is connected the excitation signal input end of vibrator 4,

[0025] The ends of a plurality of vibrating rods of the vibrator 4 respectively act on a plurality of excited points of the identification system 1, and the plurality of excited points are determined according to the relative positions of the load points to be identified, and each excited point of the...

specific Embodiment approach 2

[0026] Embodiment 2: This embodiment is a further description of Embodiment 1, and the identification system 1 is a beam or a box.

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment is a further description of Embodiment 1, and the identification system 1 is a cantilever plate.

technical field

[0001] The invention relates to a test platform and a test method for simultaneously identifying multi-point random loads, belonging to the technical field of load identification. Background technique

[0002] Load identification is to calculate the dynamic load of the system based on the dynamic characteristics of the known structure and the measured dynamic response. It is the basis of structural dynamic modification and structural dynamic sensitivity analysis. These two technologies are the key points of the combination of modal analysis, finite element analysis and computer-aided design (CAD), and are also an important part of computer-aided engineering (CAE).

[0003] Load identification technology also provides an effective method of identifying dynamic loads for structural systems where direct load measurement is not possible. For example, during the flight of the aircraft, the components in the nuclear reactor also vibrate when they are working, and ...

Examples

specific Embodiment approach 1

[0023] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the test platform for simultaneously identifying multi-point random loads described in this embodiment includes an identification system 1, and it also includes a signal generator 2, a power amplifier 3, an exciter 4, an acceleration sensor 5 and a force sensor 6 ,

[0024] Signal generator 2 is used for generating white noise excitation, and the excitation signal output end of signal generator 2 is connected the excitation signal input end of power amplifier 3, and the excitation signal output end of power amplifier 3 is connected the excitation signal input end of vibrator 4,

[0025] The ends of a plurality of vibrating rods of the vibrator 4 respectively act on a plurality of excited points of the identification system 1, and the plurality of excited points are determined according to the relative positions of the load points to be identified, and each excited point of the...

specific Embodiment approach 2

[0026] Embodiment 2: This embodiment is a further description of Embodiment 1, and the identification system 1 is a beam or a box.

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment is a further description of Embodiment 1, and the identification system 1 is a cantilever plate.

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