CN210953201U - Bridge structure cable force acceleration sensor - Google Patents
Bridge structure cable force acceleration sensor Download PDFInfo
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- CN210953201U CN210953201U CN202020084031.0U CN202020084031U CN210953201U CN 210953201 U CN210953201 U CN 210953201U CN 202020084031 U CN202020084031 U CN 202020084031U CN 210953201 U CN210953201 U CN 210953201U
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Abstract
The utility model provides a bridge construction cable force acceleration sensor, relates to the cable force test technique among the healthy diagnosis of bridge construction, in order to solve current sensor test accuracy not enough, sensitivity not enough and can not directly obtain the cable force fundamental frequency to influence the measurement accuracy problem of cable force test. The novel MEMS acceleration sensor is used for acquiring the cable force acceleration of an engineering structure and outputting the cable force acceleration in the form of a vibration signal; and the signal processing circuit is used for converting the vibration signal output by the MEMS acceleration sensor into a voltage signal with a full scale of +/-5V and outputting the voltage signal. The high-precision high-sensitivity linear phase change frequency converter has the advantages of being high in precision, high in sensitivity output, high in dynamic range, good in linearity, good in technical parameter consistency, stable and reliable in performance, low in power consumption, ultra-small in size and the like, and the low frequency starts from 0 Hz.
Description
Technical Field
The utility model relates to a cable force testing technique in bridge structures health diagnosis.
Background
The bridge cable force test is important content for bridge structure health diagnosis; the cable force test plays a significant role in the construction process of the cable-stayed bridge and the daily maintenance and detection of the cable-stayed bridge. Whether the cable force is in a reasonable range or not directly influences the overall stress state of the structure and the smoothness degree of the line shape, so that the timing test of the cable force of the stay cable is an important content for daily maintenance of cable-stayed bridges, through arch bridges, suspension bridges and other cabled bridges. Vibration frequency measurement is an important method for testing cable force; the cable can usually excite tiny vibration under the action of various environmental factors, and if the vibration fundamental frequency of the cable is analyzed by the vibration of the structure by using a high-precision and high-sensitivity vibration pickup sensor and corresponding data acquisition equipment and analysis software, the fundamental frequency is an important parameter for calculating the cable force. The vibration frequency method has the outstanding advantages of simple, convenient and quick measurement, reusable test equipment and the like, and becomes one of the most popular cable force measurement methods in the engineering field at the present stage. The very key part in the vibration frequency method is the sensor, and the existing sensor has insufficient test precision and sensitivity and cannot meet the vibration frequency method in cable force measurement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the current sensor measuring accuracy not enough, sensitivity is not enough and can not directly obtain the cable force fundamental frequency to influence the measurement accuracy problem of cable force test, provided a bridge construction cable force acceleration sensor.
The utility model discloses a bridge structure cable force acceleration sensor, which comprises an MEMS acceleration sensor and a signal processing circuit;
the MEMS acceleration sensor is used for acquiring the cable force acceleration of the engineering structure and outputting the cable force acceleration in the form of a vibration signal;
the signal processing circuit is used for converting the vibration signal output by the MEMS acceleration sensor into a voltage signal with a full-scale range +/-5V and outputting the voltage signal.
Further, the MEMS acceleration sensor comprises a three-axis accelerometer chip U1, a capacitor C1 and a capacitor C2;
the model number of the triaxial accelerometer chip U1 is: LIS344 ALH;
the pin No. 1, the pin No. 2, the pin No. 3, the pin No. 5, the pin No. 6 and the pin No. 7 of the triaxial accelerometer chip U1 are grounded simultaneously;
the No. 14 pin and the No. 15 pin of the three-axis accelerometer chip U1 are simultaneously connected with a power supply Vdd; the voltage of the power supply Vdd is 3.3V;
a No. 12 pin of the triaxial accelerometer chip U1 is a left-right component output end of the vibration signal;
a No. 10 pin of the triaxial accelerometer chip U1 is a front-back component output end of the vibration signal;
a No. 8 pin of the triaxial accelerometer chip U1 is an upper component output end and a lower component output end of a vibration signal; wherein, the left and right components of the vibration signal, the front and back components of the vibration signal, and the up and down components of the vibration signal are three output directions of the vibration signal.
Further, the signal processing circuit comprises an operational amplifier U2, a three-terminal stabilized power supply U3, a resistor R1 to a resistor R6, a capacitor C3 to a capacitor C11 and a potentiometer T1;
the model of the operational amplifier U2 is: LM 2904; the model of the three-terminal regulated power supply U3 is as follows: AMS 1117;
the No. 1 pin of the three-terminal voltage-stabilized power supply U3 is an input end which is connected with the positive output end of a 12V power supply;
the No. 2 pin of the three-terminal voltage-stabilized power supply U3 is a grounding end;
a No. 3 pin of the three-terminal voltage-stabilized power supply U3 is an output end, and the output end is connected with one end of a resistor R4;
the pin 1 of the operational amplifier U2 is simultaneously connected with one end of a resistor R1, one end of a capacitor C8, one end of a capacitor C9, one end of a capacitor C10 and one end of a capacitor C11; the other end of the capacitor C8 is simultaneously connected with the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C11, one end of the resistor R5 and one end of the resistor R6; the other end of the resistor R5 is grounded; the other end of the resistor R6 is used as a voltage signal output end of the full scale +/-5V of the signal processing circuit;
the pin 2 of the operational amplifier U2 is connected with the other end of the resistor R1 and one end of the resistor R2;
a pin 3 of the operational amplifier U2 is connected with one end of a capacitor C3, the common end of the operational amplifier U2 is used as the input end of the signal processing circuit, and the left and right component output ends of the vibration signal, the front and rear component output ends of the vibration signal and the upper and lower component output ends of the vibration signal are connected with the input end in a selecting mode; the other end of the capacitor C3 is grounded;
the No. 4 pin of the operational amplifier U2 is connected with one end of the capacitor C4 and one end of the capacitor C5 at the same time and is grounded; the other end of the capacitor C4 is connected with the other end of the capacitor C5 and is grounded;
the No. 5 pin of the operational amplifier U2 is simultaneously connected with the other end of the resistor R4 and one end of the resistor R3; the other end of the resistor R3 is connected with the sliding end of the potentiometer T1, and the fixed end of the potentiometer T1 is grounded;
the pin 6 of the operational amplifier U2 is simultaneously connected with the pin 7 of the operational amplifier U2 and the other end of the resistor R2;
a No. 8 pin of the operational amplifier U2 is connected with one end of the capacitor C6 and one end of the capacitor C7 at the same time and is grounded; the other terminal of the capacitor C6 is connected to the other terminal of the capacitor C7 and to ground.
Bridge structures cable force acceleration sensor acquire the cable force acceleration of engineering structure to export this cable force acceleration to upper signal acquisition system with full scale 5V's voltage signal's form.
The beneficial effects of the utility model are that MEMS acceleration sensor can realize the vibration measurement in the bridge cable force test, has that precision height, high sensitivity output, high dynamic range, linearity are good, the low frequency begins from 0Hz, has flat frequency characteristic response, phase place and is linear change, characteristics such as technical parameter uniformity is good, stable performance is reliable, low-power consumption, volume are super-small. The cable force acceleration sensor reduces the requirements of a subsequent data acquisition system, thereby reducing the cost of the whole bridge cable force test system; the bridge structure cable force acceleration sensor adopts low-power consumption general industrial electronic components; the low-power consumption general industrial electronic device can reduce the requirement of a system on a power supply and can reduce the requirement of the system on generating problems due to heating; the power consumption general industrial electronic device can increase the actual working temperature space of the system, improve the stability of the system and work in a plurality of harsh environments; the cost is extremely low.
Drawings
FIG. 1 is a circuit diagram of a MEMS acceleration sensor according to a second embodiment;
fig. 2 is a circuit diagram of a signal processing circuit according to a third embodiment.
Detailed Description
The first embodiment is as follows: the bridge structure cable force acceleration sensor comprises an MEMS acceleration sensor and a signal processing circuit;
the MEMS acceleration sensor is used for acquiring the cable force acceleration of the engineering structure and outputting the cable force acceleration in the form of a vibration signal;
the signal processing circuit is used for converting the vibration signal output by the MEMS acceleration sensor into a voltage signal with a full range of +/-5V and outputting the voltage signal; the full-scale +/-5V voltage signal is output to an upper signal acquisition system, and can meet the requirements of bridge cable force structural engineering.
In the embodiment, the MEMS acceleration sensor is an ultra-low frequency MEMS microchip acceleration sensor, which can output three-axis vibration acceleration signals simultaneously, and the performance frequency response of the MEMS acceleration sensor is from 0Hz, which is a sensor chip that is required for monitoring a major structure and can satisfy a cable force structure test, and can completely and effectively acquire a high-precision engineering structure vibration signal, and the output end of the MEMS acceleration sensor is connected to a signal processing circuit.
The second embodiment is as follows: the present embodiment is described with reference to fig. 1, and is further limited to the bridge structure cable force acceleration sensor according to the first embodiment, in the present embodiment, the MEMS acceleration sensor includes a three-axis accelerometer chip U1, a capacitor C1, and a capacitor C2;
the model number of the triaxial accelerometer chip U1 is: LIS344 ALH;
the pin No. 1, the pin No. 2, the pin No. 3, the pin No. 5, the pin No. 6 and the pin No. 7 of the triaxial accelerometer chip U1 are grounded simultaneously;
the No. 14 pin and the No. 15 pin of the three-axis accelerometer chip U1 are simultaneously connected with a power supply Vdd; the voltage of the power supply Vdd is 3.3V;
a No. 12 pin of the triaxial accelerometer chip U1 is a left-right component output end of the vibration signal;
a No. 10 pin of the triaxial accelerometer chip U1 is a front-back component output end of the vibration signal;
a No. 8 pin of the triaxial accelerometer chip U1 is an upper component output end and a lower component output end of a vibration signal; wherein, the left and right components of the vibration signal, the front and back components of the vibration signal, and the up and down components of the vibration signal are three output directions of the vibration signal.
In the present embodiment, the capacitance value of the capacitor C1 is 10 μ f, the capacitance value of the capacitor C2 is 0.1 μ f, and the left-right component of the vibration signal, the front-back component of the vibration signal, and the up-down component of the vibration signal are three output directions of the vibration signal, which are the X-axis direction, the Y-axis direction, and the Z-axis direction in the rectangular coordinate system, respectively; the triaxial signal output of the MEMS acceleration sensor is based on half the supply voltage.
The third concrete implementation mode: the present embodiment is described with reference to fig. 2, and is further limited to the bridge structure cable force acceleration sensor according to the first embodiment, in the present embodiment, the signal processing circuit includes an operational amplifier U2, a three-terminal regulated power supply U3, a resistor R1 to a resistor R6, a capacitor C3 to a capacitor C11, and a potentiometer T1;
the model of the operational amplifier U2 is: LM 2904; the model of the three-terminal regulated power supply U3 is as follows: AMS 1117;
the No. 1 pin of the three-terminal voltage-stabilized power supply U3 is an input end which is connected with the positive output end of a 12V power supply;
the No. 2 pin of the three-terminal voltage-stabilized power supply U3 is a grounding end;
a No. 3 pin of the three-terminal voltage-stabilized power supply U3 is an output end, and the output end is connected with one end of a resistor R4;
the pin 1 of the operational amplifier U2 is simultaneously connected with one end of a resistor R1, one end of a capacitor C8, one end of a capacitor C9, one end of a capacitor C10 and one end of a capacitor C11; the other end of the capacitor C8 is simultaneously connected with the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C11, one end of the resistor R5 and one end of the resistor R6; the other end of the resistor R5 is grounded; the other end of the resistor R6 is used as a voltage signal output end of the full scale +/-5V of the signal processing circuit;
the pin 2 of the operational amplifier U2 is connected with the other end of the resistor R1 and one end of the resistor R2;
a pin 3 of the operational amplifier U2 is connected with one end of a capacitor C3, the common end of the operational amplifier U2 is used as the input end of the signal processing circuit, and the left and right component output ends of the vibration signal, the front and rear component output ends of the vibration signal and the upper and lower component output ends of the vibration signal are connected with the input end in a selecting mode; the other end of the capacitor C3 is grounded; in practical application, one of a left component output end, a right component output end, a front component output end and a rear component output end of a vibration signal or an upper component output end and a lower component output end of the vibration signal is selected to be connected into the circuit;
the No. 4 pin of the operational amplifier U2 is connected with one end of the capacitor C4 and one end of the capacitor C5 at the same time and is grounded; the other end of the capacitor C4 is connected with the other end of the capacitor C5 and is grounded;
the No. 5 pin of the operational amplifier U2 is simultaneously connected with the other end of the resistor R4 and one end of the resistor R3; the other end of the resistor R3 is connected with the sliding end of the potentiometer T1, and the fixed end of the potentiometer T1 is grounded;
the pin 6 of the operational amplifier U2 is simultaneously connected with the pin 7 of the operational amplifier U2 and the other end of the resistor R2;
a No. 8 pin of the operational amplifier U2 is connected with one end of the capacitor C6 and one end of the capacitor C7 at the same time and is grounded; the other terminal of the capacitor C6 is connected to the other terminal of the capacitor C7 and to ground.
In the embodiment, the voltage signal output end of the full scale +/-5V of the signal processing circuit is the voltage signal output end of the full scale +/-5V of the bridge structure cable force acceleration sensor, the signal processing circuit is connected with the ground precision capacitor C3, according to the practical situation of the cable force test, the high frequency of the cable force data can not exceed 100Hz, here, through the low-pass output condition in the bridge structure cable force acceleration sensor, the capacitance value of the capacitor C3 is selected to be 15nf, so as to ensure that the cable force test effective cut-off frequency is 100Hz, the vibration data after low-pass filtering is connected with a pin 3 of an operational amplifier U2, a pin 2 and a pin 1 of the operational amplifier U2 are connected with a resistor R1, meanwhile, a pin 2 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with a pin 6 and a pin 7 of the operational amplifier U2, and a pin 5 of the operational amplifier U2 is connected with a bias voltage output by the bias circuit; pin 4 of the operational amplifier U2 is a negative power supply, and pin 8 is a positive power supply; pin No. 8 is connected with a filter capacitor C6 and a capacitor C7 to the ground; the No. 4 pin is connected with a filter capacitor C4 and a capacitor C5 to the ground; the three-terminal voltage-stabilized power supply U3, the resistor R3, the resistor R4 and the high-precision potentiometer T1 form a bias voltage regulating circuit; the No. 1 pin of the operational amplifier U2 is connected in parallel with a high-precision capacitor C8 to a capacitor C11, the capacitor C8 to the capacitor C11 and a resistor R5 form a high-pass filter circuit, and the signal output of the filter circuit is output to an upper signal acquisition system after passing through an output resistor R6.
In this embodiment, the resistance of the resistor R1 is 3.9K Ω, the resistance of the resistor R2 is 1.3K Ω, the resistance of the resistor R3 is 1.8K Ω, the resistance of the resistor R4 is 2K Ω, the resistance of the resistor R5 is 200K Ω, and the resistance of the resistor R6 is 100 Ω; the capacitance value of the capacitor C3 is 15nf, the capacitance value of the capacitor C4 is 10 muf, the capacitance value of the capacitor C5 is 0.1 muf, the capacitance value of the capacitor C6 is 10 muf, and the capacitance value of the capacitor C7 is 0.1 muf; the maximum resistance value of the potentiometer T1 is 2K omega;
the bridge structure cable force acceleration sensor has a measuring range of 2 g; the sensitivity (Vdd/5) of the sensor is 4, and the sensitivity of the bridge structure test cable force acceleration sensor is 2.5V/g; frequency response: 100 Hz; dynamic range: the dynamic range of the cable force sensor for the existing engineering cable force test is generally below 70dB, so that the cable force fundamental frequency is difficult to directly obtain.
Claims (3)
1. A bridge structure cable force acceleration sensor is characterized by comprising an MEMS acceleration sensor and a signal processing circuit;
the MEMS acceleration sensor is used for acquiring the cable force acceleration of the engineering structure and outputting the cable force acceleration in the form of a vibration signal;
the signal processing circuit is used for converting the vibration signal output by the MEMS acceleration sensor into a voltage signal with a full-scale range +/-5V and outputting the voltage signal.
2. The bridge structure cable force acceleration sensor of claim 1, wherein the MEMS acceleration sensor comprises a three-axis accelerometer chip U1, a capacitor C1 and a capacitor C2;
the model number of the triaxial accelerometer chip U1 is: LIS344 ALH;
the pin No. 1, the pin No. 2, the pin No. 3, the pin No. 5, the pin No. 6 and the pin No. 7 of the triaxial accelerometer chip U1 are grounded simultaneously;
the No. 14 pin and the No. 15 pin of the three-axis accelerometer chip U1 are simultaneously connected with a power supply Vdd; the voltage of the power supply Vdd is 3.3V;
a No. 12 pin of the triaxial accelerometer chip U1 is a left-right component output end of the vibration signal;
a No. 10 pin of the triaxial accelerometer chip U1 is a front-back component output end of the vibration signal;
a No. 8 pin of the triaxial accelerometer chip U1 is an upper component output end and a lower component output end of a vibration signal; wherein, the left and right components of the vibration signal, the front and back components of the vibration signal, and the up and down components of the vibration signal are three output directions of the vibration signal.
3. The bridge structure cable force acceleration sensor of claim 2, characterized in that the signal processing circuit comprises an operational amplifier U2, a three-terminal regulated power supply U3, a resistor R1 to a resistor R6, a capacitor C3 to a capacitor C11 and a potentiometer T1;
the model of the operational amplifier U2 is: LM 2904; the model of the three-terminal regulated power supply U3 is as follows: AMS 1117;
the No. 1 pin of the three-terminal voltage-stabilized power supply U3 is an input end which is connected with the positive output end of a 12V power supply;
the No. 2 pin of the three-terminal voltage-stabilized power supply U3 is a grounding end;
a No. 3 pin of the three-terminal voltage-stabilized power supply U3 is an output end, and the output end is connected with one end of a resistor R4;
the pin 1 of the operational amplifier U2 is simultaneously connected with one end of a resistor R1, one end of a capacitor C8, one end of a capacitor C9, one end of a capacitor C10 and one end of a capacitor C11; the other end of the capacitor C8 is simultaneously connected with the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C11, one end of the resistor R5 and one end of the resistor R6; the other end of the resistor R5 is grounded; the other end of the resistor R6 is used as a voltage signal output end of the full scale +/-5V of the signal processing circuit;
the pin 2 of the operational amplifier U2 is connected with the other end of the resistor R1 and one end of the resistor R2;
a pin 3 of the operational amplifier U2 is connected with one end of a capacitor C3, the common end of the operational amplifier U2 is used as the input end of the signal processing circuit, and the left and right component output ends of the vibration signal, the front and rear component output ends of the vibration signal and the upper and lower component output ends of the vibration signal are connected with the input end in a selecting mode; the other end of the capacitor C3 is grounded;
the No. 4 pin of the operational amplifier U2 is connected with one end of the capacitor C4 and one end of the capacitor C5 at the same time and is grounded; the other end of the capacitor C4 is connected with the other end of the capacitor C5 and is grounded;
the No. 5 pin of the operational amplifier U2 is simultaneously connected with the other end of the resistor R4 and one end of the resistor R3; the other end of the resistor R3 is connected with the sliding end of the potentiometer T1, and the fixed end of the potentiometer T1 is grounded;
the pin 6 of the operational amplifier U2 is simultaneously connected with the pin 7 of the operational amplifier U2 and the other end of the resistor R2;
a No. 8 pin of the operational amplifier U2 is connected with one end of the capacitor C6 and one end of the capacitor C7 at the same time and is grounded; the other terminal of the capacitor C6 is connected to the other terminal of the capacitor C7 and to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020084031.0U CN210953201U (en) | 2020-01-15 | 2020-01-15 | Bridge structure cable force acceleration sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020084031.0U CN210953201U (en) | 2020-01-15 | 2020-01-15 | Bridge structure cable force acceleration sensor |
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| CN210953201U true CN210953201U (en) | 2020-07-07 |
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| CN202020084031.0U Active CN210953201U (en) | 2020-01-15 | 2020-01-15 | Bridge structure cable force acceleration sensor |
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| CN (1) | CN210953201U (en) |
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