A deep hole transfer function testing system and testing method thereof
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A technology of transfer function and testing system, which is applied in vibration testing, testing of machine/structural components, measuring devices, etc., can solve problems such as excessive volume, reduce overall cost, facilitate operation, and drop hammer components quickly and easily Effect
Active Publication Date: 2018-05-01
中国铁道科学研究院集团有限公司城市轨道交通中心 +2
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The device can be transported and moved, and placed on the track or inside the tunnel for impact excitation, which can only meet the excitation on the ballast bed and in the tunnel, and requires personnel to operate nearby. It is too large to be placed inside the borehole to meet the requirements for drilling Bottom Excitation Requirements
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Embodiment 1
[0048] Embodiment 1, a kind of deep hole transfer function testing system described in the embodiment of the present invention, such as figure 2 As shown, it includes a deep hole excitation device, a data acquisition instrument 7, a plurality of acceleration sensors 9 and a PC 10, and a plurality of acceleration sensors 9 are evenly arranged on the formation surface, and the data line of the deep hole excitation device is connected to the input end of the data acquisition instrument 7, A plurality of acceleration sensors 9 are respectively connected to the input end of the data acquisition instrument 7 through the data line 8, and the output end of the data acquisition instrument 7 is connected to the PC 10 through the network cable.
[0049] Such as image 3 As shown, the deep hole vibration device includes a drop hammer support 1, a steel strand 2, a motor 3, a force hammer assembly 5 and a steel sleeve 6, the drop hammer support 1 is located on the surface of the formation, ...
Embodiment 2
[0054] Example 2, such as Figure 5 Shown, the present invention also provides a kind of testing method of deep hole transfer function testing system, and this method comprises the following steps:
[0055] Step 1, use a drilling machine to drill an excitation hole with a diameter of 500mm in the formation, such as Figure 6 As shown, the concrete sleeve 4 is used to protect the vibration hole. The bottom of the vibration hole is in-situ soil, which is used for stratum vibration. The multi-segment steel cylinders of the steel sleeve are spliced into the vibration hole. The steel sleeve It is closely attached to the soil at the bottom of the excitation hole.
[0056] Step 2, fix the deep hole vibration device on the surface of the formation, and drop the hammer assembly 5 into the steel sleeve of the vibration hole.
[0057] Step 3, such as Figure 7 As shown, 10-20 measuring points are arranged at equal intervals of 3-5m from the vibration-exciting hole on the stratum sur...
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Abstract
The invention discloses a deep hole transfer function test system. The system comprises a deep hole exciting device, a data acquisition instrument, a plurality of acceleration sensors which are evenly arranged on the ground, and a PC machine. The deep hole exciting device is connected with the data acquisition instrument. The acceleration sensors are connected with the data acquisition instrument. The data acquisition instrument is connected with the PC machine. The deep hole exciting device comprises a drop hammer bracket, a steel strand, a motor, a force hammer assembly and a steel sleeve. The drop hammer bracket is located on the ground. The motor is located on the drop hammer bracket. The steel strand is connected with the drop hammer bracket. An exciting hole is arranged in the formation. A concrete sleeve is arranged on the inner side of the exciting hole. The steel sleeve is arranged on the inner side of the concrete sleeve. The force hammer assembly is located in the steel sleeve. The force hammer assembly is connected with the motor through the steel strand. The invention further provides a test method of the deep hole transfer function test system. The system and the method have the advantages that pulse excitation can be carried out in a borehole of any depth in the formation; effective vibration excitation is generated; all signals are synchronously sampled; and any formation transfer function can be tested and calculated.
Description
technical field [0001] The invention relates to the technical field of vibration testing, in particular to a deep hole transfer function testing system and a testing method thereof. Background technique [0002] At present, there is no test system and technology for vibration prediction using the measured formation transfer function. The existing relatively similar test system is to measure the vibration acceleration of the tunnel wall and the vibration acceleration of the ground surface, and then calculate the transfer ratio of the two, so as to obtain the actual measurement. The transfer characteristics of the stratum are used for vibration prediction. This test system does not obtain the vibration transfer function. The prediction principle ignores the phase information of the vibration source excitation of the subway train running, and there is a systematic error, so the prediction accuracy is average. At the same time, in the test process of the measured transfer ratio ...
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