LU101256B1 - A 4G-Network Ground Motion Recording, Acquisition and Storage System - Google Patents
A 4G-Network Ground Motion Recording, Acquisition and Storage System Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/01—Measuring or predicting earthquakes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/22—Transmitting seismic signals to recording or processing apparatus
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- G—PHYSICS
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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- G01V1/24—Recording seismic data
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Abstract
This invention discloses a 4G-network ground motion recording, acquisition and storage system comprising several acceleration sensors, analog signal processors, an analog-to-digital converter, a central processing unit, a remote wireless 4G communication system, a GPS time transfer system, a power conversion module and a solar-wind hybrid power supply system. Said acceleration sensors consist of three sensors connecting to the analog-to-digital converter via their respective analog signal processors. Said analog-to-digital converter is bi-directionally connected to the central processing unit. Said central processing unit is bi-directionally connected to the remote wireless 4G communication system and the GPS time transfer system respectively. The invention adopts the mobile 4G communication technology which is widely used currently to communicate data, namely a monitoring network is set up, realizing large-scale monitoring of strong earthquakes and ensuring the reliability of strong earthquake monitoring. The invention has the characteristics of flat frequency response, linear change of phase, good consistency of technical parameters, stable and reliable performance, low power consumption, small volume, etc.
Description
BL-5092 Specification LUT01256 - A 4G-Network Ground Motion Recording, Acquisition and Storage System
FIELD OF THE INVENTION This invention relates to the field of strong motion monitoring, in particular to a strong motion recording and acquisition system based on the wireless technology.
BACKGROUND OF THE INVENTION A strong motion seismograph is an instrument that monitors the occurrence of an earthquake and records the relevant parameters at the time of the earthquake. It is an automatic triggered seismograph recording the near-surface motion of a strong earthquake. It is generally composed of a vibration collection system, a recording system, a trigger-start system, a time-scale system, and a power supply system. Thanks to national economic and social development, China has set up seismic networks to monitor earthquakes and obtain seismic data. It is also stipulated that seismic monitoring devices shall be installed in major engineering structures and special building structures. The occurrence of the earthquake is unpredictable, so is its intensity and impact, which puts very strict requirements on the monitoring devices. Currently most strong motion seismographs adopt wire transmission, and data acquisition, transmission and processing are independently completed, which means a seismograph stores the seismic data into the instrument after an earthquake. In many cases, the transmission line is damaged, so relevant personnel need to go to the site to retrieve the data after the earthquake and then conduct data analysis. However, sometimes a strong motion seismograph can be completely damaged due to the super destructive effect of the earthquake or aftershocks, resulting in loss of data and failure to fully analyze the impact of the earthquake and accumulate data. Furthermore, wire transmission requires lots of wiring and the engineering site is huge, so it is impossible to monitor the entire site, making it difficult to completely analyze the seismic impact. Traditional seismic instruments need 220-volt power supply, and some also have emergency power supply, but seriously destructive earthquakes can cause, sometimes -1-
BL-5092 prolonged, power failure, which means many aftershocks occurred during this period! 756 cannot be recorded, so we cannot get a complete recording of an earthquake. In addition, traditional seismographs do not have enough memory space to store the recording data of an earthquake.
SUMMARY OF THE INVENTION The objective of the invention is to design a 4G-network ground motion recording, acquisition and storage system for large-scale, uninterrupted earthquake monitoring which solves problems relating to wire transmission, power supply and memory space facing traditional strong motion seismographs. For the above purpose, the technical scheme of the invention is as follows: A 4G-network ground motion recording, acquisition and storage system comprising several acceleration sensors, analog signal processors, an analog-to-digital convertor, a central processing unit, a remote wireless 4G communication system, a GPS time transfer system, a power conversion module and a solar-wind hybrid power supply system; said acceleration sensors contain three sensors, namely a north-south direction acceleration sensor, an east-west direction acceleration sensor and a vertical direction acceleration sensor,said north-south, east-west and vertical direction acceleration sensors are connected to the analog-to-digital converter through their respective analog signal processors, said analog-to-digital converter is bi-directionally connected to the central processing unit, said central processing unit is bi-directionally connected to the remote wireless 4G communication system and the GPS time transfer system respectively; said power conversion module is connected to the solar-wind hybrid power supply system, the acceleration sensors, the analog signal processors, the analog-to-digital converter, the central processing unit, the remote wireless 4G communication system and the GPS time transfer system; said acceleration sensors are high-precision force balance acceleration sensors, said high-precision force balance acceleration sensors are ultra-low-frequency acceleration sensors whose frequency response starts from 0 Hz, output ends of the acceleration sensors are connected with the analog signal processors; -2-
SL BL-5092 LU101256 said analog signal processors modulate the full-scale +5V vibration signal obtained by the acceleration sensors to a signal satisfying the requirements of the analog-to-digital converter; said analog-to-digital converter realizes conversion of an analog signal to a digital signal through peripheral standard configuration circuit and logic control of the central processing unit; said central processing unit enables acquisition of acceleration sensor data, data calculation management, data storage and seismic record file management, seismic algorithm and control logic, remote wireless data communication, and data interaction with remote monitoring software; The GPS time transfer system enables the operation of the entire system is based on the UTC time and meets the general requirements for international seismic recording time. said GPS time transfer system enables the operation of the entire system is based on the UTC time and meets the general requirements for international seismic recording time; said remote wireless 4G communication system uses a wireless 4G transparent transmission communication module to realize remote wireless data communication. Further,said acceleration sensors are FBA12 high-precision force balance acceleration sensors. Further,the circuit of the entire system adopts a multi-layer design. Furtherthe whole system adopts low-power general-purpose industrial-grade electronic components. Further,the whole system adopts the virtual instrument technology. Further,said central processing unit adopts ARM's ARMv7-based 32-bit Cortex-M3-MCU-cored STM32 chip. Further,said remote wireless 4G communication system adopts an industrial-grade WH-LTE-7S4 wireless 4G module. Compared with the prior art, this invention has the following beneficial effects:
1. The central processing unit of this invention adopts ARM's ARMv7-based 32-bit Cortex-M3-MCU-cored STM32 chip. With diverse product lines, very high performance-price ratio and easy-to-develop database, STM32 quickly stands out from -3-
BL-5092 many Cortex-M3 MCUs. This invention uses STM32429, a chip of the STM32 family which? “> has better performance, for system control and data calculation. With STM32's powerful data signal processing and counting function, algorithm calculation and storing of seismic data, and remote communication can be directly performed using the structural data collected by the system.
2. The invention adopts the mobile 4G communication technology which is widely used currently for data communication. At present, the mobile 4G communication system is stable and reliable with a wide range of coverage, which ensures the stability and safety of the system communication and enables large-scale monitoring of strong earthquakes by setting up a monitoring network. The use of wireless communication technology allows the system to monitor without wiring, simplifying the on-site monitoring process, thus ensuring the reliability of strong motion monitoring.
The invention adopts a mature industrial-grade WH-LTE-7S4 wireless 4G module for wireless communication. The mature and stable WH-LTE-7S4 wireless 4G module ensures the system’s stable, reliable and real-time communication of data covering a large-scale area. The invention realizes network monitoring of strong earthquakes through the monitoring center, and large-scale strong earthquake monitoring by data interaction with multiple strong motion monitoring systems.
3. The invention adopts high-precision acceleration sensors to obtain complete and effective monitoring data of strong earthquakes. The sensor itself is a unidirectional, electronically and mechanically integrated, broadband acceleration sensor which uses force balance electronic feedback to convert the single-direction vibration acceleration into voltage signal output to realize measurement of various low-frequency and ultra-low-frequency vibration. It is characterized by high precision, high-sensitivity output, high dynamic range, good linearity, responding from 0 Hz (the characteristics of seismic signals require acceleration sensors responding from 0 Hz to be used as vibration pick-up), flat frequency response, linear change of phase, good consistency of technical parameters, stable and reliable performance, low power consumption, small volume, etc.
4, The circuit of the invention adopts a multi-layer design which has following advantages: small in size and light in weight; improved reliability because connection -4-
BL-5092 between components (including electronic parts) is reduced due to the high assembly 1296 density of the multi-layer circuit boards; increased design flexibility realized by multi-layer wiring; forming a circuit with certain impedance; forming a high-speed transmission circuit; shielding layers for the electrical and magnetic circuits can be set, and the heat dissipation layer for the metal core can also be set to meet shielding, heat dissipation and other functional requirements of shielding and heat dissipation; easy to test.
5, The invention uses low-power general-purpose industrial-grade electronic components. Low-power components can reduce the power requirements of the system and problems caused by system overheating. Industrial-grade parts can increase the actual working temperature range of the system and improve its stability.
6 . The invention adopts the virtual instrument technology which combines high-performance modular hardware with efficient and flexible software to complete various tests, measurements and automation applications. Compared with other technologies, virtual instrument technology has four advantages: high performance, high scalability, time saving, and seamless integration.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is the schematic composition diagram of the invention. FIG. 2 is the schematic diagram of circuits of the acceleration sensors and analog signal processors.
FIG. 3 is the schematic diagram of circuits of the analog-to-digital convertor, the core board of the central processing unit (SD card memory) and the GPS time transfer system.
FIG. 4 is the schematic diagram of circuits of the remote wireless 4G communication module, the controllable power chip and the power conversion module.
Detailed description of the invention Following parts will further explain the invention based on the attached figures. As shown in FIG. 1, the invention is a 4G-network ground motion recording, acquisition and storage system comprising several acceleration sensors, analog signal processors, an analog-to-digital convertor, a central processing unit, a remote wireless 4G communication -5-
EEE BL-5092 system, a GPS time transfer system, a power conversion module and a solar-wind hybrid power supply system. As shown in FIG. 2, said analog signal processor includes operational amplifiers U1 and U2; the output end of said acceleration sensor is connected to the pin (2) of the operational amplifier U1 through the resistor R1; the output end of said acceleration sensor is connected with the protective tube D1 to limit the discharge voltage amplitude; the pin (2) and pin (6) of the operational amplifier U1 are respectively connected in series with the resistor R3 and the multi-coil high-precision potentiometer T1, and its pin (3) is grounded through the resistor R2; said operational amplifier U1, resistor R3, potentiometer T1 and resistor R2 constitute a -0.5-time inverting amplifier: since the full-scale output signal of the acceleration sensor is +5V, and the full-scale input signal of the analog-to-digital converter is +2.5v, so the operational amplifier U1 is used to realize the full-scale signal matching; the high-precision multi-coil potentiometer T1 is used to adjust the amplification ratio of the circuit of the operational amplifier U1 to ensure accuracy of measurement.
The pin (4) of the operational amplifier U1 is connected to a negative power supply and its pin (7) is connected to a positive power supply; a +12V power supply is connected to the pin (7) of the operational amplifier U1 through the resistor R4 and grounded through the filter capacitor C2; the resistor R4 and the filter capacitor C2 constitute the RC power filter network which ensures stable power supply to the operational amplifier U1; a -12V power supply is connected to the pin (4) of the operational amplifier U1 through the resistor R5 and grounded through the filter capacitor C1; the resistor R5 and the filter capacitor C1 constitute the RC power filter network which ensures stable power supply to the operational amplifier U1.
The pin (1) and (8) of the operational amplifier U1 are connected with the high-precision multi-coil potentiometer T2 which is used to adjust the zero offset of the pre-signal processing circuit.
The signal output of the operational amplifier U1 is connected to the pin (2) of the operational amplifier U2 through the resistor R1, and the pin (2) of the operational amplifier U2 is connected to its output pin (6) through another resistor R1 with the same resistance value. Said operational amplifier U2 and two resistors R1 constitute a -1-time inverting -6-
BL-5092 amplifier.
The pin (3) of the operational amplifier U2 is grounded through the resistor RZ! 01256 Said operational amplifier U1 and U2 reversely amplify the signal twice and restore the polarity of the signal of the acceleration sensor to the original.
The pin (4) of the operational amplifier U2 is connected to a negative power supply and its pin (7) is connected to a positive power supply; a +12V power supply is connected to the pin (7) of the operational amplifier U2 through the resistor R4 and grounded through the filter capacitor C2; the resistor R4 and the filter capacitor C2 constitute the RC power filter network which ensures stable power supply to the operational amplifier U2; a -12V power supply is connected to the pin (4) of the operational amplifier U2 through the resistor RS and grounded through the filter capacitor C1; the resistor R5 and the filter capacitor C1 constitute the RC power filter network which ensures stable power supply to the operational amplifier U2. As shown in FIG. 3, there are three analog signal processors (each referred to as U3) which are respectively connected to acceleration sensors in three directions; signals of the acceleration sensors processed by the analog signal processors are respectively connected to the AIN1, AIN2 and AIN3 of the analog-to-digital convertor U3 through the pin (6) of the operational amplifier U2. The analog-to-digital converter U3 is a 24-bit high-precision, high-speed, low-power converter for analog front end of the 2/3 channel of low frequency measurements; the device receives low-level input signals directly from the acceleration sensors and then generates serial digital outputs; 24-bit loss-free coding is realized using theX-Aconversion technology; the selected input signal is sent to an analog-modulator-based gain programmable dedicated front end; the digital filter in the chip of the analog-to-digital converter processes the output signal of the modulator; the control register in the chip of the analog-to-digital converter adjusts the cut-off point and output update rate of the digital filter; the serial interface of the analog-to-digital converter chip is a three-wire interface; a single +5V power supply whose input voltage range is + 2.5V.
The pin (2) and (3) of the analog-to-digital converter U3 are connected with the crystal oscillator Y1 which is the main clock of the analog-to-digital converter U3. The pin (2) and (3) are grounded through the starting capacitor C15. When the frequency of the main clock is 2.4576MHz, the programming range of the first notch frequency is 50Hz~500Hz, and the -7-
BL-5092 range of -3dB frequency is 13.1Hz-131Hz. According to the characteristics of seismic dätal 012%6 effective sampling frequency needs to be 100Hz, combining with the software, the system can fully meet the needs of seismic monitoring.
The analog signal range of the analog-to-digital converter U3 is 2.5V, and the reference voltage is required. The reference voltage stabilizing chip U4 provides 1.25V reference voltage output, and the power input end and 1.25V output end of the reference voltage stabilizing chip U4 are grounded through capacitors C3 and C4 for decoupling. The reference voltage stabilizing chip U4 is a tiny, high-precision, low-power 3-pin SOT-23- encapsulated voltage reference. The analog-to-digital converter U3 is powered with SV, and the central processing unit U5 is powered with 3.3V; there is a level mismatch between them, so a level conversion chip is required for the communication between them. Three level conversion chips (each referred to as U12) are used for level conversion, two of which are power by 5V. 3.3V control signals RESET, DIN, CS and SCLK from the central processing unit are first converted by the U12 powered with 5V and then transmitted to the analog-to-digital converter U4; 3.3V status signals and converted digital signals from the analog-to-digital converter U4 are first converted by the U12 powered with 3.3V and then transmitted to the central processing unit. The power supply for the level conversion chip U12 is grounded through the capacitor C3 for decoupling.
As shown in FIG.3, said central processing unit comprises the CPU chip U5, GPS time transfer system U6 and SD card memory US.
Said CPU chip U5 controls the work of all logic function chips and manages data algorithm and data storage. Said CPU chip U5 has its own debugging interface, so users do not need to consider the issues of simulation debugging and program download. The core of the main control chip STM32f429 of the CUP chip U5 comprises an ARM®s 32-bit Cortex®-M4 CPU which has FPU and an ART™ accelerator which is an adaptive real-time accelerator that achieves zero latency in Flash memory and whose main frequency is up to 180MHz. The core has the DSP instruction set and its performance is up to 225DMIPS/1.25DMIPS/MHz (Dhrystone 2.1). Its memory is up to 2 MB Flash, organized into two areas, can read and write synchronously, and includes up to 256+4 KB of SRAM, 64-KB CCM (core-coupled memory) data RAM, and flexible external storage controllers up -8-
BL-5092 to 32 bits of data bus: SRAM, PSRAM, SDRAM/LPSDRSDRAM, Compact 2° Flash/NOR/NAND, etc. Its strong basic performance fully meets the design requirements of the invention.
The reset circuit of the CPU chip U5 is composed of R10 and C11, which are connected to the NRST end of the U5. The R10 end is connected with 3.3V, and the C11 end is earthed; reset is realized through pulling down when the circuit is powered. The terminal J1 selecting BOOT loading mode uses a wire jumper to select whether to connect a 3.3V power supply or the ground. BOOTO and BOOT1 are connected with the current-limiting resistor R10. Program loading mode is set using a wire jumper according to the actual commissioning and full-speed operation; when the program works abnormally in the process of circuit debugging, a wire jumper can be used to select whether the circuit is connected to a 3.3V power supply or the ground to restore the system to work.
The power conversion chip U8 converts the power supply from +5V to +3.3V for the CPU chip U5 and data memory U9; the input +5V power supply and the output +3.3V power supply are decoupled and filtered by the capacitors C8 and C3 to ensure stable power supply.
Said data memory U9 is an SD card. Because of its large storage capacity (2G, 4G or larger), an SD card can store a large amount of seismic recording data, for example, the complete recording of thousands of aftershocks of the Wenchuan Earthquake in Sichuan without the need to replace the storage medium. SD cards are widely used in portable devices, and an important data storage component for embedded apparatuses. SD cards can be directly written and read. File systems can also be written into an SD card, and then data read-write operation on the bottom layer of the SD card can be performed using read and writing functions of the file systems. SD cards can also be read and write directly using the SDIO structure function. The power conversion chip U8 supplies 3.3V power to the SD card. The capacitor C3 is used to decouple the power supply of the data memory U9. Each of the pins (1), (2), (3), (7) and (8) of the data memory U9 is connected with a pull-up (3.3V) resistor R10, and is respectively connected to pins (49), (50), (51), (53) and (54) of the CPU chip U5. The pin (5) of the data memory U9 is connected to the pin (52) of the CPU chip US.
Pins (5), (10), (11), (12) and (13) of the data memory U9 is earthed; its pin (1) is powered -9-
BL-5092 with 3.3V; its other pins are normally closed.
LU101256 Said remote wireless 4G communication system includes the wireless 4G communication interface chip U10 and the power conversion chip U11. Its specific circuit is shown in FIG. 4. FIG. 4 also shows power conversion modules providing operating power for the GPS time transfer system and CPU chip U5. Said power conversion modules comprise the module DS1 and DS2. The remote wireless data communication chip U10 is a functional module for wireless communication.
It is a 4G-communication-based product with compact size and rich functions.
It is applicable to the China Mobile’s, China Unicom’s and China Telecom's 4G network systems as well as China Mobile’s and China Unicom’s 3G and 2G network systems. “Transparent transmission” is the core function of the chip U10. Because of its double-row-header packaging, users can quickly and easily integrate it into their own systems.
Said chip U10 has functionally comprehensive software which covers most general application scenarios, so bidirectional transparent data transmission from the serial port to the network can be realized through simple settings.
It also supports custom registration packet, heartbeat packet and other functions, two-way Socket connection as well as http and other protocol communications.
It features high speed and low latency.
The power conversion chip U11 converts the +5V power supply into +3.8V for the chip U10. The power conversion chip U11 is highly precise, stable and its voltage is adjustable.
It provides 3.8V output by adjusting the resistance values of resistors R11 and R12 (Vout=1.24*[1+ (R11/R12)]). Pins (1) and (2) of the chip U10 are connected with +5V power supply.
Its pin (3) is earthed and pin (4) is the output end connecting with the resistor R11. The other end of the resistor R11 is connected to the pin (5) and grounded through the resistor R12. The chip U10’s typical voltage value is 3.8V, power supply range is 3.4-4.2V and peak supply current is 2.5A.
The 3.8V output from the power conversion chip U11 is transmitted to the pin (16) of the chip U10 through a large-capacitance network and a bypass capacitor.
The large-capacitance network prevents the external power supply from voltage drop during the pulse current period.
The bypass capacitor is used to stabilize the module.
The chip U10 provides a SIM card interface that conforms to the ISO 7816-3 standard, and automatically recognizes 3.0V and 1.8V SIM cards.
It provides the 3.25 MHz -10-
BL-5092 clock signal for the USIM card in standard mode and the 1.08 MHz clock signal for the 1256 USIM card in low-power mode. It supports clock shutdown mode, and the speed-enhanced USIM card by adjusting baud rate parameters; it supports DMA transmission/reception, and automatic power saving mode in logout mode; it supports automatic odd-even check in RX mode. The chip U10 has integrated SIM card function and can be used directly. Pins (20), (21), (22) and (23) of the chip U10 are directly connected with the SIM card (a SIM card holder is required on the circuit board), and earthed through the TVS protection diode. Due to the frequent operation of inserting or removing the USIM card, and the human body contains static electricity, so a transient voltage suppressor is needed to discharge static electricity to prevent static damage to the USIM card and the chip. It needs to be grounded through the capacitor C14 and its pin (20) should be earthed through the capacitor C3 to filter out interference from radio frequency signals. The pin (9) of the chip U10 sends the working status indicating signal to the pin (9) of the CPU chip U5. Since there is a power-supply-level mismatch between the chip U10 and the chip U5, the bipolar junction transistor Q1, resistor R13 and power supply 3.3V are needed to convert the 3.8V level signal to a 3.3V one to enable the chip U5 to obtain the working status of the chip U10. The default level of pins (6) and (7) of the chip U10 is 3.3V, so they can be directly connected to pins (92) and (24) of the chip US. Pins (11) and (12) of the chip U10 are grounded, and its other pins are normally closed.
The GPS time transfer system meets international general seismic recording requirements, so the system adopts the world unified time for seismic recording. The SKG17A used in the GPS time transfer system U6 is a complete GPS module with extremely high sensitivity and precision, ultra-low power consumption and minimal size. GPS signals obtain complete serial data information with position which also includes time and speed information from the antenna. It is based on a high-performance monolithic structure; with -165dBm sensitivity and 10nS timing accuracy, it fully meets the precision requirement of an earthquake monitoring system. Its location coverage extends to environments like cities, canyons and dense forests, so it satisfies the field-environment requirements of an earthquake monitoring system and is possible to obtain GPS information. Being extremely small in size and low in power consumption makes said -11-
BL-5092 SKG17A module easy to be applied to the system and integrated into portable devices. The. 250 GPS time transfer system U6 is powered with 3.3V which is converted by the controllable power chip U7. The power input pin (1) of the controllable power chip U7 is decoupled by capacitors C3 and C6, and its output pin (5) is decoupled by the capacitor C6. The power input pin (4) of the chip U7 is earthed through the capacitor C7, and its pin (2) is directly grounded. The power input pin (3) of the chip U7 is the power conversion control terminal which is directly connected to the pin (25) of the CPU chip U5. When the GPS is not used, the power supply of the GPS module can be turned off to reduce power consumption. Pins (3) and (4) of the chip U7 are serial data interfaces and connected to the resistor R6 respectively. The output end of the resistor R6 is connected to a 3.3V power supply through the pull-up resistor R7. The two lines of signal output and input are respectively connected to pins (7) and (8) of the CPU chip U5 for serial communication. The 3.3V power supply from the chip U7 is transmitted to the power supply processing circuit of the GPS time transfer system U6. The power supply of the GPS is filtered by L1, C3 and C4, and is also decoupled to enable the GPS module to receive stable and reliable data. The pin (11) of the chip U7 is earthed through the capacitor C5 and also connected with the resistor R8. The output end of the chip U7 is connected with the battery BT1 which provides backup power for the GPS module when its main power supply system fails to ensure uninterrupted data output. The pin (16) of the chip U7 is for the antenna and should be connected to the outdoor receiving antenna with a 50ohm low-noise cable. An active antenna can be selected according to the actual situation. The GPS time transfer system U6 adopts the active antenna to improve signal quality. The pin (19) can supply power to the active antenna and the power output end is decoupled by the capacitor C3. Pins (7), (13), (14), (15) and (17) are earthed, and other pins are normally closed.
Said power conversion module and power supply system include a solar-wind hybrid power supply system, a +12V storage battery and DC/DC modules DS1 and DS2. The input end of the +12V storage battery is connected to the power inducer L2 through decoupling and filtering capacitors C3 and C11; the output end of the power inducer L2 is respectively connected to input ends of the DC/DC modules DS1 and DS2 through decoupling and filtering capacitors C3 and C11. Said module DS2 converts the power into a -12-
BL-5092 +5V single power supply which is transmitted to chips after being decoupled and filtered by 2° capacitors C3 and C4; said module DS1 converts the +12V power into a +/-12V dual power supply which is transmitted to operational amplifiers U1 and U2 after being decoupled by two groups of capacitors C3 and C11. Considering the harsh operating environment, in particular a complete power outage when destructive earthquakes occur, a solar-wind hybrid power supply system is designed to supply power to the whole system. Under normal conditions solar power is used to charge the storage battery, and when it is cloudy or rainy, wind power is used to charge the battery, so uninterrupted power supply from the storage battery is realized to ensure continuous and stable operation of the whole system.
Said remote wireless 4G communication system includes the wireless 4G communication interface chip U10 and the power conversion chip U11. Its specific circuit is shown in FIG. 4. FIG. 4 also shows power conversion modules providing operating power for the GPS time transfer system and CPU chip U5. Said power conversion modules comprise the module DS1 and DS2.
The invention adopts high-precision force-balance FBA12 acceleration sensors. According to the experience of structural testing, the acceleration sensor for structural monitoring should be a high-precision one with high dynamic range and ultra-low- frequency response. Said high-precision force-balance FBA12 acceleration sensors are unidirectional, electronically and mechanically integrated, broadband acceleration sensors which use force balance electronic feedback to convert the single-direction vibration acceleration into voltage signal output to realize measurement of various low-frequency and ultra-low-frequency vibration. The new-generation, high-precision FBA12 acceleration sensor, characterized by high precision, high-sensitivity output, high dynamic range, good linearity, responding from O Hz, flat frequency response, linear change of phase, good consistency of technical parameters, stable and reliable performance, low power consumption, small volume, etc., is very suitable for the invention.
The CPU chip U5 of the invention performs analog-to-digital convertor logic control, data acquisition, seismic algorithm calculation, seismic data storing, seismic data record file management, remote wireless data communication and other functions. Seismic data -13-
BL-5092 storing and seismic data record file management can be fully realized with STMEE12%° powerful data calculation function.
A complete seismic recording process should be as follows: Earthquakes themselves don't happen very often, so the system is left on standby when no earthquake occurs, just monitoring the data it has collected.
Under this circumstance, preset parameters are needed: the triggering mode (including threshold triggering, STA/LTA and STA-LTA), triggering value set according to conditions of the mounting position of the strong motion seismograph (reasonable seismic algorithm, and testing in consideration of a variety of cases to ensure effective triggering values and avoid false or missing triggering); triggering recording time (recording time before and after the triggering, because a complete seismic record should include data before and after the triggering which contain lots of seismic structural information); and remote alarm (the remote alarm mechanism should be immediately activated when the triggering occurs to enable various rescue responses to the earthquake as soon as possible). The strong motion seismograph system on standby monitors the change of data, and activates the remote alarm immediately when the triggering occurs and begins to record as well as store data at the same time.
If another triggering occurs during the recording process, it continues to record until the triggering ends, which may result in a quite large data record file.
But the system must be able to obtain a complete seismic record and manage a large number of data record files.
The monitoring center can remotely get the data through wireless communication and analyze the earthquake situation and structural damage to provide data basis to reduce secondary damage in earthquake rescue.
In addition, the working time of the system is based on the GPS time.
All components and connectors of the invention can be purchased from the electronic market (see Table 1 for details), which helps to greatly reduce the manufacturing cost and improve the performance of the system.
Table 1: List of Components and Connectors Serial | Category Code No.
Packaging Nominal Info.
Remarks Numb er 1 |Resistor |R1Rz |0ë05 jax | | -14-
BL-5092 3 [Resistor |ReRs |0ë05 [sR | | 4 |Ressor Re Joss |m | | |Ressor — |Re loss [am | | 6 |Resistor [RM loos les | | 7 [Resor Riz joss lew | 1 8 |Ressor |RiaRe Joos |K | | 9 |Capactor — |ctczcs loss [we |__| |capactor |c14 [0805 arp | | 11 |Capactor [cm2 Joos [ta | | 12 |Capactor |C13 Josos Jwop | | 13 [Capactor cz Joss (ta | pe eR 1 Capacitor = Capacitor
CE Capacitor HG i Capacitor
CE ET Capacitor I ee I i RS Capacitor Adjustment Adjustment 22 [cosa [v1 Through-Hol |2.4676M | -15-
BL-5092
TE 1 2 [inductr jt | fer || 25 |chip Juiz sos |omm | | 26 cup lus sols |wwrros | | 27 fewp Jus [sors |Rersts | 28 [mp [us |DP10s |FescoeBoa | | |chip fue | |skem | _ so Jew Jur |everesraw | | 31 fewp Jus | |(mmoessav | | 32 [Emip jus | |spcadsss | | 3s |chip juio | |wédTErsa | 3 |chip jum | wes | | 3 [Sensor | | Fam | a [pemc Jos2 | Jess [a | a7 [pemc Jost | |mpm |2a | 3 __|Protective Tube Dt | sswso |__| 39 |ProwcweTue |D2 | |swanso | |
EEE TE Transistor 4 Jeo | | (Wa |)
ERT Header 43 Double-Row 200p Pin Header Holder
EEF Pin Header -16-
BL-5092 Lo Le ; ; . ; LU101256 The invention is not limited to this embodiment, and any equivalent ideas or modifications within the technical scope disclosed by the invention shall be included in the scope of protection of the invention. -17-
Claims (7)
1. A 4G-network ground motion recording, acquisition and storage system, comprises: several acceleration sensors, analog signal processors, an analog-to-digital converter, a central processing unit, a remote wireless 4G communication system, a GPS time transfer system, a power conversion module and a solar-wind hybrid power supply system; said acceleration sensors contain three sensors, namely a north-south direction acceleration sensor, an east-west direction acceleration sensor and a vertical direction acceleration sensor, said north-south, east-west and vertical direction acceleration sensors are connected to the analog-to-digital converter through their respective analog signal processors, said analog-to-digital converter is bi-directionally connected to the central processing unit, said central processing unit is bi-directionally connected to the remote - wireless 4G communication system and the GPS time transfer system respectively; said power conversion module is connected to the solar-wind hybrid power supply system, the acceleration sensors, the analog signal processors, the analog-to-digital converter, the central processing unit, the remote wireless 4G communication system and the GPS time transfer system; said acceleration sensors are high-precision force balance acceleration sensors, said high-precision force balance acceleration sensors are ultra-low-frequency acceleration sensors whose frequency response starts from 0 Hz, output ends of the acceleration sensors are connected with the analog signal processors; said analog signal processors modulate the full-scale +5V vibration signal obtained by the acceleration sensors to a signal satisfying the requirements of the analog-to-digital converter; said analog-to-digital converter realizes conversion of an analog signal to a digital signal through peripheral standard configuration circuit and logic control of the central processing unit; said central processing unit enables acquisition of acceleration sensor data, data calculation management, data storage and seismic record file management, seismic algorithm and control logic, remote wireless data communication, and data interaction with -1-
BL-5092 remote monitoring software; LU101256 said GPS time transfer system enables the operation of the entire system is based on the UTC time and meets the general requirements for international seismic recording time; said remote wireless 4G communication system uses a wireless 4G transparent transmission communication module to realize remote wireless data communication.
2. The 4G-network ground motion recording, acquisition and storage system according to claim 1 ,wherein said acceleration sensors are FBA12 high-precision force balance acceleration sensors.
3. The 4G-network ground motion recording, acquisition and storage system according to claim 1, wherein the circuit of the entire system adopts a multi-layer design.
4. The 4G-network ground motion recording, acquisition and storage system according to claim 1 ,wherein the whole system adopts low-power general-purpose industrial-grade electronic components.
5. The 4G-network ground motion recording, acquisition and storage system according to claim 1 ‚wherein the whole system adopts the virtual instrument technology.
6, The 4G-network ground motion recording, acquisition and storage system according to claim 1 ,wherein said central processing unit adopts ARM's ARMv7-based 32-bit Cortex-M3-MCU-cored STM32 chip.
7. The 4G-network ground motion recording, acquisition and storage system according to claim 1,wherein said remote wireless 4G communication system adopts an industrial-grade WH-LTE-7S4 wireless 4G module. -2-
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| CN110068438A (en) * | 2019-05-16 | 2019-07-30 | 大连大学 | A kind of nuclear power engineering structure autoexcitation Gernral Check-up monitoring data acquisition device |
| CN110942610A (en) * | 2019-12-10 | 2020-03-31 | 大连理工大学 | Intelligent rock microseismic acquisition and data wireless transmission system |
| CN111966012A (en) * | 2020-08-11 | 2020-11-20 | 大连大学 | Multichannel synchronous low-frequency vibration data acquisition device |
| CN113391342A (en) * | 2021-05-26 | 2021-09-14 | 哈尔滨工业大学 | Dual-power self-adaptive switching seismic data acquisition system and implementation method |
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| CN201340457Y (en) * | 2009-01-22 | 2009-11-04 | 北京港震机电技术有限公司 | General-purpose seismic data collecting and recording device |
| US9461872B2 (en) * | 2010-06-02 | 2016-10-04 | Hewlett Packard Enterprise Development Lp | Compressing data in a wireless network |
| CN102185384A (en) * | 2011-05-23 | 2011-09-14 | 怀化建南电子科技有限公司 | Intelligent controller of wind and light supplementary power generation system |
| CN204065423U (en) * | 2014-06-30 | 2014-12-31 | 中国石油化工集团公司 | Field discrete earthquake digital recording equipment |
| CN104077889A (en) * | 2014-07-17 | 2014-10-01 | 哈尔滨理工大学 | Stationary type public monitoring terminal for earthquake early warning cloud monitoring network |
| CN105403912A (en) * | 2014-08-25 | 2016-03-16 | 中国石油化工股份有限公司 | Device and system for collecting seismic data |
| CN105809882B (en) * | 2016-04-07 | 2018-05-04 | 大连大学 | A kind of data acquisition warning device of crash bearer wireless monitoring-alarming system |
| CN106248200B (en) * | 2016-07-26 | 2018-10-12 | 大连大学 | A kind of wireless data acquisition system of engineering structure fundamental frequency test |
| CN106569255A (en) * | 2016-11-14 | 2017-04-19 | 中国矿业大学 | Wireless transmission-based coal mine stope earthquake source monitoring and locating system |
| CN206893080U (en) * | 2017-07-12 | 2018-01-16 | 东华理工大学 | It is a kind of based on the seismic signal acquiring system being wirelessly transferred |
| CN108614290A (en) * | 2018-05-14 | 2018-10-02 | 中国地质大学（武汉） | A kind of wireless distributed three-component seismic data acquisition system based on LoRa technologies |
| CN108761525A (en) * | 2018-07-20 | 2018-11-06 | 中石化石油工程技术服务有限公司 | A kind of autonomous acquisition system of seismic prospecting untethered |
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