CN104713597A - Fast radio telescope health monitoring method - Google Patents
Fast radio telescope health monitoring method Download PDFInfo
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- CN104713597A CN104713597A CN201510080202.6A CN201510080202A CN104713597A CN 104713597 A CN104713597 A CN 104713597A CN 201510080202 A CN201510080202 A CN 201510080202A CN 104713597 A CN104713597 A CN 104713597A
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Abstract
The invention discloses a FAST radio telescope health monitoring method. Monitoring is conducted in the radio telescope construction process and the radio telescope use process, a plurality of monitoring points are arranged on latticed columns, ring beams and a main cable network of a radio telescope, the stress and deformation state of the monitoring points are monitored, and therefore the structure safety and the use reliability of the radio telescope are monitored. The radio telescope construction process and the radio telescope use process are involved, monitoring is comprehensive, and the structure safety and the use reliability of the radio telescope can be ensured. The monitoring points are reasonably distributed on the radio telescope, and therefore the overall monitoring is achieved through the monitoring points as fewer as possible.
Description
Technical field
The present invention relates to a kind of FAST radio telescope health monitor method, be specifically related to radio telescope structural safety monitoring.
Background technology
Construction 500 meters of bore spherical radio telescopes that State Astronomical Observatory, CAS proposes are single port footpath radio telescopes the biggest in the world.FAST (Five-hundred-meter Aperture Sphericalradio Telescope is called for short FAST) breaches hundred meters of engineering limit of terrestrial telescope, has started the new model of the huge radio telescope of construction.The total technical index of FAST: bore is 500m, reflector curvature radius is 300m; Surround bore is 300m, coke ratio f/D=0.4611.
FAST Active Reflector is made up of collar tie beam, lattice column, reflecting surface unit, main rope net, actuator arrangement, earth anchor etc., and structural representation can referring to Figure of description 1, accompanying drawing 2, accompanying drawing 3.Main rope net is arranged on collar tie beam, has 2225 nodes, and main rope net node is installed 4450 reflecting surface unit of having an appointment and forms reflecting surface, be connected with downhaul and actuator below each node, actuator is connected with earth anchor again.By controlling actuator, 300 meters of instantaneous parabolas of bore can be realized and carry out astronomical sight.
Active Reflector system architecture is complicated, 30 years designed lives.The long-term effect of environmental attack, material aging and load, the coupling of the disaster factors such as fatigue effect and mutation effect inevitably will cause damage accumulation and the degradation resistance of structure; thus opposing the disaster even ability of home effect decline, and cause catastrophic burst accident under extreme case.In order to ensure the security of structure, integrality, applicability and permanance, need to set up structural safety monitoring system.
Summary of the invention
For problems of the prior art, the invention provides a kind of FAST radio telescope health monitor method, can the parameter such as Real-Time Monitoring radio telescope structure operation phase structural key component internal force, structure bulk deformation by the method, in conjunction with periodic monitoring data and structural environment load monitoring data, the security level of evaluation structure also carries out early warning.
The object of the invention is to be achieved through the following technical solutions:
FAST radio telescope health monitor method, respectively in the monitoring of radio telescope work progress and use procedure monitoring, by arranging some monitoring points on the net at radio telescope lattice column, collar tie beam, main rope, monitor the force and deformation state at this place, thus monitoring radio telescope safety of structure and dependability.
Further, described work progress monitoring comprises the installation of main rope net and the monitoring of reflecting surface unit lifting work progress.
Further, described use procedure monitoring also comprises environmental monitoring residing for radio telescope, actuator monitoring and the monitoring of main rope net node location.
Further, when described lattice column arranges monitoring point, extract some groups of lattice columns and lay, comprise the lattice column at corresponding main rope host rib place; Choose 1 of described lattice column correspondence ring beam support place girt in the inner part and fall within 2 of basis post limb components in the inner part and arrange measuring point.
Further, when monitoring point arranged by described collar tie beam, comprise the collar tie beam section at corresponding main rope host rib place, arrange measuring point at inner side bearing, outside bearing and collar tie beam span centre.
Further, described inner side bearing: 2 diagonal web members, 1 lower edge hoop chord member;
Described outside bearing: 2 diagonal web members, 1 lower edge hoop chord member;
Described collar tie beam span centre: hoop chord member inside 1 lower edge.
Further, in described reflecting surface unit lifting work progress monitoring, on collar tie beam winds up twice opposite sex section structural member, arrange monitoring point, the collar tie beam section choosing corresponding main rope host rib place arranges described monitoring point, arranges described monitoring point in reflecting surface unit lifting region simultaneously.
Further, in the guy rope plate node location arrangements monitoring point of described collar tie beam and main rope net junction.
Further, described main rope net measuring point selection principle is: the edge main rope that main rope net is connected with collar tie beam, and main rope net is near the main rope of central area; Main rope net in operational process STRESS VARIATION amplitude more than the part main rope of 420MPa; More than stress upper limit 400MPa and stress amplitude are more than the main rope of 300MPa.
Further, described actuator monitoring comprises the monitoring of oil pressure, oil temperature, air pressure, temperature and actuator orientation, and wherein the data of oil pressure can be used to the Suo Li calculating downhaul.
The FAST radio telescope health monitor method of above-mentioned technological means is adopted to have the following advantages:
The present invention relates to work progress and the use procedure of radio telescope, monitoring is comparatively comprehensive, can guarantee safety of structure and the dependability of radio telescope.
Monitoring point set by the present invention is laid rationally in radio telescope structure, realizes whole monitoring with the least possible magnitude setting.
Accompanying drawing explanation
Fig. 1 is collar tie beam structural representation;
Fig. 2 is main rope web frame schematic diagram;
Fig. 3 is the schematic diagram of lifting reflecting surface unit;
Fig. 4 is lattice column health monitoring point layout schematic diagram;
Fig. 5 is lattice capital point layout schematic diagram;
Fig. 6 is point layout schematic diagram at the bottom of lattice column;
Fig. 7 is collar tie beam health monitoring point layout schematic diagram;
Fig. 8 is lattice column corresponding collar tie beam health monitoring point position schematic diagram;
Fig. 9 is lattice column corresponding collar tie beam health monitoring point position schematic diagram;
Figure 10 is collar tie beam work progress monitoring point layout schematic diagram;
Figure 11 is lattice column corresponding collar tie beam work progress monitoring point position schematic diagram;
Figure 12 is reflecting surface unit lifting region collar tie beam work progress monitoring point position schematic diagram;
Figure 13 is the monitoring point position schematic diagram of collar tie beam distortion;
Figure 14 is main rope net monitoring point layout position view;
Figure 15 is main rope structural representation;
Figure 16 is main rope sensor prewelding transition block schematic diagram;
Figure 17 is reflecting surface Nei Tai location excavation topomap;
Figure 18 is that schematic diagram laid by line concentrating case and vasculum;
Figure 19 is type vibration wire system layout scheme schematic diagram;
Figure 20 is that fiber Bragg grating (FBG) demodulator lays schematic diagram;
Figure 21 is fiber Bragg grating type system layout scheme schematic diagram;
Figure 22 is main rope net sensor positioning scheme schematic diagram.
In figure: 1, column; 2, collar tie beam; 3, main rope net; 3-1, main rope; 3-2, ground tackle; 3-3, transition block; 3-4, main rib; 4, downhaul;
5, rail locomotive; 6, operate locomotive; 7, reflecting surface unit; 8, crane; 9, carrying rope; 10, traction rope; 11, center ring beam.
A-H, measuring point.
Embodiment
For further setting forth the present invention for the technological means that reaches predetermined technique object and take and effect, below in conjunction with accompanying drawing and preferred embodiment, structure of the present invention, workflow are described in detail as follows.
FAST radio telescope health monitor method described in the invention, respectively in the monitoring of radio telescope work progress and use procedure monitoring, by arranging some monitoring points on the net at radio telescope lattice column, collar tie beam, main rope, monitor the force and deformation state at this place, thus monitoring radio telescope safety of structure and dependability.
Above-mentioned work progress monitoring comprises the installation of main rope net and the monitoring of reflecting surface unit lifting work progress.
Above-mentioned use procedure monitoring also comprises environmental monitoring residing for radio telescope, actuator monitoring and the monitoring of main rope net node location.
When lattice column is arranged monitoring point, extract some groups of lattice columns and lay, comprise the lattice column at corresponding main rope host rib place; Choose 1 of described lattice column correspondence ring beam support place girt in the inner part and fall within 2 of basis post limb components in the inner part and arrange measuring point.
When monitoring point arranged by above-mentioned collar tie beam, comprise the collar tie beam section at corresponding main rope host rib place, arrange measuring point at inner side bearing, outside bearing and collar tie beam span centre.
Above-mentioned inner side bearing: 2 diagonal web members, 1 lower edge hoop chord member;
Above-mentioned outside bearing: 2 diagonal web members, 1 lower edge hoop chord member;
Above-mentioned collar tie beam span centre: hoop chord member inside 1 lower edge.
In above-mentioned reflecting surface unit lifting work progress monitoring, on collar tie beam winds up twice opposite sex section structural member, arrange monitoring point, the collar tie beam section choosing corresponding main rope host rib place arranges described monitoring point, arranges described monitoring point in reflecting surface unit lifting region simultaneously.
In the guy rope plate node location arrangements monitoring point of collar tie beam and main rope net junction.
Main rope net measuring point selection principle is: the edge main rope that main rope net is connected with collar tie beam, and main rope net is near the main rope of central area; Main rope net in operational process STRESS VARIATION amplitude more than the part main rope of 420MPa; More than stress upper limit 400MPa and stress amplitude more than 300MPa, the main rope that stress-number of cycles is more; The main rope that part internal force is larger.
Above-mentioned actuator monitoring comprises the monitoring of oil pressure, oil temperature, air pressure, temperature and actuator orientation, and wherein the data of oil pressure can be used to the Suo Li calculating downhaul.
Two parts are divided to introduce technical scheme of the present invention in detail below.
(1) FAST Active Reflector health monitoring systems
1. the working range of system
State Astronomical Observatory, CAS's 500 meters of bore spherical radio telescope (FAST) Active Reflector health monitoring systems mainly comprise following content:
Health monitoring systems Deepen Design;
Health monitoring systems is installed;
Health monitoring systems is debugged;
Active Reflector Monitoring Service.
Above content can be divided into four-stage:
In the health monitoring systems Deepen Design stage: carry out health monitoring systems Deepen Design according to design requirement, specifically comprise scheme detailed design, hardware design and Software for Design;
The installation phase of health monitoring systems: the installation etc. comprising hardware device buying, hardware installation and wiring, software development and installation and affiliated facility.
The debug phase of health monitoring systems: comprise hardware debug, software debugging, health monitoring systems uniting and adjustment and health monitoring systems trial run.
The Active Reflector Monitoring Service stage: comprise work progress monitoring and health monitoring two parts.Work progress Monitoring Service is the installation of rope net and the monitoring of reflecting surface unit lifting work progress.Specifically comprise the installation of work progress monitoring equipment needed thereby, equipment debugging and work progress monitoring etc.; Health monitoring service is after the engineering construction of FAST Active Reflector terminates, to the health monitoring service that Active Reflector systems stay carries out.
2. can the specification of reference and file
According to the requirement of FAST engineering, perform existing relevant specification of country.
3. technical requirement
The health monitoring object of Active Reflector mainly comprises two parts: a part is Active Reflector system self monitor item, and a part is then by obtaining the monitoring item of Monitoring Data from FAST engineering survey and control system (being all called for short " TT&C system " below).Self monitor item and content as shown in table 1, obtain the object of Monitoring Data by TT&C system and content as shown in table 2.
Table 1 Active Reflector health monitoring self monitor item and content directory
Table 2 obtains monitoring item and the content directory of Monitoring Data by TT&C system
Details are as follows for the monitoring requirements of FAST Active Reflector health monitoring systems:
Environmental monitoring
Wind load is one of Main Load of Active Reflector structure.Be necessary to carry out wind speed and direction measurement to the typical azimuth within the scope of depression.Temperature monitoring comprises environment temperature and structure temperature.Environment temperature monitoring point combines with wind environment monitoring point.Structure temperature monitoring point combines with structural strain monitoring point, to obtain the Temperature Distribution of structure, and provides temperature compensation for structural strain.
Owing to all arranging wind environment and environment temperature monitoring sensor on 6 feed towers, the method that this part Monitoring Data is transmitted by data and shared directly obtains from TT&C system.
Structure monitoring
Structural stress judges the most direct index of structural safety, structure sub-health state can cause overstressing or stress abnormality distribution again, the ANOMALOUS VARIATIONS of stress needs monitoring, and whether safety is controlled to carry out synthetic determination configuration state in conjunction with the displacement strategy of reflecting surface and environmental monitoring results.
3.1.1 collar tie beam lattice column is monitored
Collar tie beam is main rope net periphery supporting structure, be made up of ring beam and 50 lattice columns, the height of lattice column is 6.419-50.419 rice with karst landform elevation distributed area, be made up of H profile steel (joist steel), welding odd-shaped cross section component, round steel pipe etc., be connected with gusset plate by solder sphere.The monitoring of collar tie beam lattice column is mainly monitored from structural strain aspect.
3.1.1.1 strain monitoring
A) measuring point requirement
Choose 10 lattice columns and arrange measuring point, lattice column is numbered: 1#, 6#, 11#, 16#, 21#, 26#, 31#, 36#, 41#, 46# (as shown in Figure 4).To the lattice column needing monitoring, choose 1 of correspondence ring beam support place girt (the A indicating positions in Fig. 5) in the inner part and fall within 2 of basis post limb components (the B indicating positions in Fig. 6) in the inner part and arrange measuring point.
To all lattice columns, arrange 30 measuring points altogether.
B) strain monitoring technical requirement
Selected strain transducer measuring accuracy is not less than 1%FS, range is not less than ± 1500 μ ε.
C) monitoring frequency requirement
Work progress monitoring is carried out continuously at rope net and reflecting surface unit lifting construction stage; Health monitoring is carried out continuously in telescope operational process.
3.1.2 collar tie beam structure monitoring
When the temperature varies and whole reflecting surface forms the different paraboloid surface shape pointed to as required time, the stress of whole collar tie beam and shape will change.The state relation of collar tie beam the safety of rope net and the precision of reflecting surface.Collar tie beam monitoring should mainly from the viewpoint of structural strain monitoring and structural deformation monitoring two.
3.1.2.1 strain monitoring
A) measuring point requirement
Consider collar tie beam wind up twice the opposite sex section structural member can bear larger construction loads in reflecting surface cellular installation process, for this part of rod member, advise monitoring in work progress.Given this situation, the monitoring for collar tie beam can be divided into health monitoring and work progress to monitor two parts.
3.1.2.2 collar tie beam health monitoring point layout
Select to arrange measuring point at the collar tie beam place of the lattice column correspondence position that need monitor, as shown in Figure 7.For the collar tie beam section (corresponding main rope host rib) that 6#, 16#, 26#, 36#, 46# lattice column is corresponding, arrange that measuring point (often locates layout 8 measuring points, as shown in Figure 8) at inner side bearing, outside bearing and collar tie beam span centre; For the collar tie beam section that 1#, 11#, 21#, 31#, 41# lattice column is corresponding, arrange that measuring point (often locates layout 6 measuring points, as shown in Figure 9) at inner side bearing, outside bearing.
Collar tie beam measuring point selects situation as follows:
Inner side bearing: 2 diagonal web members, 1 lower edge hoop chord member (connecting rod side);
Outside bearing: 2 diagonal web members, 1 lower edge hoop chord member (connecting rod side);
Collar tie beam span centre: hoop chord member inside 1 lower edge, as the D indicating positions in Fig. 8.
To whole collar tie beam, arrange 70 monitoring points altogether.
3.1.2.3 collar tie beam work progress monitoring point layout
In Reflector Panel lifting construction process, need emphasis monitor collar tie beam wind up twice the opposite sex section structural member.Choose collar tie beam section corresponding to 6#, 16#, 26#, 36#, 46# lattice column (corresponding main rope host rib) and arrange measuring point.Consider need arrange reflecting surface unit hanging equipment at A sector collar tie beam simultaneously, need monitor in reflecting surface unit lifting region according to follow-up Hoisting Program.Work progress monitoring point layout as shown in Figure 10.
For the collar tie beam section that 6#, 16#, 26#, 36#, 46# lattice column is corresponding, wind up at holder top, collar tie beam span centre winds up and arrange that measuring point (often locates layout 6 measuring points, as shown in figure 11); In reflecting surface unit lifting region, the collar tie beam section chosen in adjacent three lattice column intervals according to Hoisting Program arranges measuring point, (arranges 10 measuring points) as shown in figure 12.
To whole collar tie beam, arrange 40 monitoring points altogether.
B) strain monitoring technical requirement
Selected strain transducer measuring accuracy is not less than 1%FS, range is not less than ± 1500 μ ε.
C) monitoring frequency requirement
Work progress monitoring is carried out continuously at rope net and reflecting surface unit lifting construction stage; Health monitoring is carried out continuously in telescope operational process.
3.1.2.4 deformation monitoring
TT&C system lays target in collar tie beam guy rope plate node position, utilizes measuring equipment to measure collar tie beam distortion, and processes measurement data.The method that Active Reflector health monitoring systems is transmitted by data and shares directly obtains the Monitoring Data of the distortion of collar tie beam from TT&C system.Amount to 150 measuring points, as shown in figure 13.
Rope net is monitored
3.1.3 the monitoring of main rope
Main rope net comprises about 6670 main ropes, and every root length is about 11m.The stress of main rope judges overall rope software safety and the important evidence in life-span.
3.1.3.1 measuring point requirement
Main rope net measuring point selection principle is: the edge main rope that main rope net is connected with collar tie beam.Main rope net in operational process STRESS VARIATION amplitude more than the part main rope of 420MPa; More than stress upper limit 400MPa and stress amplitude more than 300Mpa, the main rope that stress-number of cycles is more; The main rope that part internal force is larger; These main ropes are mainly distributed in main rope net central area.
According to mentioned above principle, main rope net health monitoring arrangement as shown in figure 14, amounts to 406 measuring points.Line segment thicker in Figure 14 is measuring point setting position.
3.1.3.2 cable force monitoring technical requirement
The measuring accuracy of selected cable tension sensor and range should meet the actual requirement of this project Suo Li amplitude of variation, and allow cable force monitoring error to be not more than 10%, gauge length is not more than 80mm.
3.1.3.3 monitoring frequency requirement
Work progress monitoring is carried out continuously at rope net and reflecting surface unit lifting construction stage; Health monitoring is carried out continuously in telescope operational process.
Actuator is monitored
Actuator comprises the sensor for monitoring its duty and performance, needs the information spinner of monitoring will refer to oil pressure, oil temperature, air pressure, temperature and actuator orientation information, and wherein the data of oil pressure can also be used to the Suo Li calculating downhaul.The method that the monitoring information of actuator and drop-down rustling sound force information are all transmitted by data and share directly obtains from TT&C system.
Node location is monitored
The locus of node is also the important evidence differentiating reflecting surface integrality.The method that the locus of node is transmitted by data and shared directly obtains from TT&C system.
Monitoring software system functional requirement
The monitoring of software of health monitoring systems, generally should have on-line monitoring, off-line analysis, data base administration, safety management, patrol functions such as surveying and select survey, supervisory work, measured value state, the inquiry of historical data, running status assessment, network security and user authority management.Mainly comprise nine functional modules:
The design of structural information---structure, construction, completion and sensor placement information;
Sensor management---check, edit the parameter of sensor or collecting device;
Data acquisition---sensor real-time synchronization gathers, and checks, edits, information adds function after manual inspection;
State estimation---by Analysis on monitoring data current structure state;
Daily servicing---storage administration is carried out to structure daily servicing data, realizes data autostore and auto report feature;
Journal function---the end of month generates this month monitoring journal automatically; Possess and manually generate monitoring journal module;
When each monitoring project of abnormity early warning---Active Reflector system is abnormal, sends early warning signal and signal is sent to TT&C system.
Telemanagement---remote monitoring module;
Secondary development function---when needs increase monitoring item or data processing item, secondary development should be carried out to software.
Other technical requirement of health monitoring systems
3.1.4 electromagnetic interference (EMI)
The frequency range of FAST operation of receiver is 70MHz-3GHz, needs the electromagnetic interference (EMI) to the equipment in this frequency range produces to be suppressed.
First, for any electronic equipment or parts that may cause electromagnetic radiation that may relate in health monitoring systems, involved country or the requirement of industry standard all should be met.
Secondly, all electronic equipments of health monitoring systems and parts, all should install according to the principle of Electro Magnetic Compatibility, integrated and use.
Finally; for health monitoring systems; according to the interference level of equipment and International Telecommunications Union (ITU) to the suggestion document (ITU-R RA.796) of radio astronomy interference protection limit value; the effective safeguard procedures of equipment de-sign of limit value need be exceeded to interference; such as shielding, ground connection and filtering etc.; need both sides to exchange about to the understanding of ITU-R RA.796, taken charge of the explanation by Party A and clearly specifically shield index.Relevant EMC Requirements is as follows:
(1) signal transmission wire should adopt optical cable as far as possible.According to shielded cable, shielding area of coming in and going out should use wave filter;
(2) fiber-optic signal line to be come in and gone out shielding area by cut-off waveguide;
(3) for the electrical equipment such as sensor, vasculum selected, the electromagnetic compatibility standard data that product meets should be provided; For the electrical equipment not meeting electromagnetic compatibility standard, consulted to determine testing scheme by both sides, carry out Electromagnetic Interference Test and rectification.
(4) if only EMI protective treatment can not be taked for work progress monitoring and maintenance phase monitoring for vibratory strain ga(u)ge and data acquisition system (DAS) thereof, if for the operation phase, need to carry out EMI protective treatment; (FBG) demodulator is taken into account for fibre strain and must carry out EMI protective treatment.
Because the cost of Electro Magnetic Compatibility rectification is far above electromagnetic Compatibility Design, so just should start to consider electromagnetic Compatibility Design in the initial design stage.Main contents have:
When carrying out lectotype selection and system, the measure may taked for electromagnetic interference source and travel path thereof should be taken into full account, as:
1) electric power incoming line wave filter and reactor;
2) shielding of power lead and signal cable and problem with grounding;
3) cut-off waveguide of wall crossed by optical fiber.
3.1.5 lightning protection
For data acquisition module, Signal-regulated kinase, data transmission module and sensor, the requirement of lightning protection all should be considered, specifically comprise three aspects:
One, adopts the physical medium that optical fiber transmits as data as far as possible;
Its two, using the signal of optical fiber and data line for not allowing, using siganl thunder-proof device;
Its three, for power supply, use Surge Protector.
3.1.6 system terminal
Active Reflector health monitoring systems terminal is positioned at FAST and observes base, a high-performance server is needed to be used for receiving and process Monitoring Data, operating system is not less than win7, hard-disk capacity should be able to support that running the data being no less than 3 years continuously stores, two hard disk should be adopted, the timely automated back-up of data.
Any third party software (containing the operating system) expense that system terminal relates to, should be included in offer by tender.
Sensor is arranged and is demarcated
3.1.7 sensor positioning scheme
The strain transducer of this engineering is selected to adopt and is counted master with fiber grating strain, counts auxiliary scheme with vibrating string type strain, sensor arrangement principle and the results are shown in (two) part.
3.1.8 transducer calibration
Cable force monitoring sensor need complete the drafting of calibration curve in rope factory during stretch-draw.
3.1.9 sensor is installed
Collar tie beam and lattice column upper sensor are responsible for installation by winning bidder.Rope web sensor is installed and can be consulted with Suo Wang unit in charge of construction, utilizes its rope net installation facility.
4. Monitoring System principle
The design of Active Reflector system health monitoring system will be carried out according to following principle:
Table 3 Active Reflector health monitoring systems principle of design
5. system wiring
In order to obtain optimum efficiency in wiring and data transmission, the data transmission of health monitoring systems and wires design should with reference to the Realization of Cable Systems Designs of TT&C system, make full use of the equipment such as its core node, middle second wife, central machine room, according to the feature of rope net, collar tie beam structure, with long-life, short distance, do not affect other structure for principle.
Need to propose corresponding interface requirements in the wires design scheme of native system.
Collecting device should be arranged in as far as possible build reflecting surface depression in middle second wife near.
6. with FAST engineering related system and subsystem interface
Active Reflector health monitoring systems respectively with the actuator of Active Reflector system, reflecting surface unit, collar tie beam and rope net system; The master control of TT&C system and Active Reflector control subsystem, and the landform subsystem of platform location system has interface relationship.
With actuator interface
Actuator is the telescoping mechanism that can carry out controlling and position is fed back, and one end and earth anchorage, the downhaul of the other end and connecting strand net active node is hinged.According to control signal instruction, actuator overcomes rope net internal force and produces downhaul pulling force, the spacing of ground anchor point and rope net active node downhaul termination is changed by changing its length, thus the active node position of adjustment rope net, realize the face shape adjustment of FAST Active Reflector.Actuator major parameter: maximal work load: 6-10t; Total kilometres: 1200mm; Change source speed: 1.6mm/s; Observation speed :-0.58-0.58mm/s; Positioning precision: ± 0.25mm.
With collar tie beam interface
Collar tie beam is main rope net periphery supporting structure, and lattice collar tie beam is connected with main rope, and collar tie beam is made up of ring beam and lattice column, and the height of lattice column is followed karst landform and changed, and collar tie beam structural representation as shown in Figure 1.Collar tie beam major parameter: collar tie beam internal diameter: 500.8 meters; Struts number: 50; Collar tie beam width: 11 meters; Pillar height: 6.419-50.419 rice is space truss form, is made up of, is connected by solder sphere with gusset plate H profile steel (joist steel), welding odd-shaped cross section component, round steel pipe etc.
With rope network interface
Rope net is the supporting construction of reflecting surface unit, and it is made up of about 6670 main ropes and 2225 downhauls, and main rope net periphery hangs on collar tie beam, and for supporting reflex face unit, the neutral surface of rope net is sphere, and as shown in Figure 2, rope net overview is main rope net schematic diagram:
Main rope tennis radius surface: 300.4m; Main rope network interface footpath: 500m.
Main rope unit sum: 6670; Rope net node: 2225, downhaul has 2225.
Main rope element length: 10.2m ~ 12.4m.
Main rope selects heavily stressed width guy system to be made up of the ground tackle at steel strand wires (steel wire) Shu Chengpin rope and two ends, web member.Figure 15 is main rope schematic diagram.
The interface of native system and rope net system is main rope cable force monitoring.As mentioned before, main rope cable tension sensor selects vibratory string or fiber grating strain meter, and employing is welded on ground tackle, by the main cable force of monitoring ground tackle strain indirect monitoring.Because main rope ground tackle material is 40Cr, weldability is poor and easy generation stress is concentrated or welding crack, affects the fatigue lifetime of rope.Main rope sensor connects " prewelding transition block " scheme (as shown in figure 16) of employing, welds two transition block in advance when rope manufactures on the main rope ground tackle that main rope monitoring measuring point is corresponding.Main rope cable force monitoring sensor can directly be welded in transition block.
With platform location system interface
Marching into the arena road in FAST platform location, has circumferential highway to lead to alveole water hole, have again spiral road to enter into bottom large nest water hole.Reflecting surface unit completes assembled at alveole water hole, and the effective working area of alveole water hole is more than 10,000 square metres.
Due to factors such as platform location excavation and landform, the rope net nodal distance floor level of half of wherein having an appointment is about 4.3 meters, remainder distance floor level about 4.3 ~ 50 meters, reflecting surface Nei Tai location topomap as shown in figure 17, round dot is collar tie beam lattice column position, darker regions is that rope net nodal distance ground vertical height is about 4.3 meters, rope net nodal distance ground vertical height then about 4.3 ~ 50 meters of distances in collar tie beam inner white region.
With TT&C system interface
6.1.1 with master control subsystem interface
Total control subsystem is that telescope is debugged and in operational process, commissioning staff or the interactive system between observation personnel and telescope, have research contents and comprise: telescopical observation controls; The on-line monitoring of telescope operating mode and health and fault handling; Aggregation of data process.
This project mainly comprises following two aspects with the interface relationship of total control subsystem:
The method transmitted by data and share, from the measurement data corresponding to the monitoring target listed by total control subsystem acquisition table 1;
By crucial for Active Reflector health monitoring early warning information and status data Real-time Feedback extremely total control subsystem.
6.1.2 with Active Reflector control subsystem interface
The construction object that Active Reflector controls is in depression, build the high speed, the reliably communication control net that are made up of main control computer and 2300 Node Controllers, the position of each node globally normal direction can be adjusted in certain scope, realize spherical reflective surface illuminated part real-time fitting and become instantaneous parabola.Specifically comprise: primary reflection surface controller is researched and developed; Controller is installed and the system integration; Comprehensive wiring.
Comprehensive wiring system adopts stelliform connection topology configuration form.Master Control Room is located at observation building central machine room, and scene establishes 12 Ge Zhong second wives as between intermediary's distributing frame management, realizes the network link with each terminal device in scene by exchanging interconnecting device.Rigging up and debugging stage Master Control Room has not yet been built, and establishes interim Central Control Room at Nan Yakouchu, and cable wiring path is that interim Central Control Room goes back to each equipment point in interim Central Control Room to depression to Master Control Room.
Generic cabling engineering mainly adopts 2 cores, 4 cores and 14 core single mode outdoor optical cables to carry out data-signal transmission, a small amount of employing 6 core multimode optical cables.Distributing frame in each equipment control all adopts 19-inch standard cabinet, lands installation; All Xin cease Jie Kou ﹙ Cha Zuo ﹚ and all adopt BS86 type.
This project mainly comprises with the interface of Active Reflector control subsystem:
The wiring of monitoring system;
The power supply of monitoring equipment;
Monitoring Data is transmitted;
Monitoring equipment placement location.
(2) Active Reflector health monitoring systems sensor selection scheme
1. sensor selection gist
In FAST engineering Active Reflector health monitoring systems monitoring target, need this installation of project sensor and the object of self monitor mainly comprises collar tie beam and lattice column strain measuring point and main cable force measuring point two aspects.
The strain monitoring of collar tie beam and lattice column, can select the strain transducer that engineering is conventional.Investigation in early stage and test show, vibratory strain ga(u)ge and fiber grating strain meter all exist the feature of applicable FAST collar tie beam and lattice column monitoring requirements.
Due to the singularity of FAST engineering, conventional cable force monitoring sensor such as magnetic flux transducer, rope meter etc. are all not suitable for FAST cable force monitoring demand.Through investigation in early stage and test, cable force monitoring selects the method for vibratory string or fiber grating strain meter indirect inspection.Be fixed on anchor head by strainometer, utilize Suo Li to change and strain there is this principle of linear relationship with ground tackle, in cable wire factory, set up calibration curve corresponding to strainometer during stretch-draw, and the calibration curve of this strainometer and correspondence thereof is used for the cable force monitoring of this rope.
2. two kinds of sensor key property contrasts
Feature according to FAST engineering and the demand to sensor, be analyzed as shown in table 4 for vibrating string extensometer and fiber grating strain meter from aspects such as properties, pre-stage test results.
Table 4 fiber grating strain meter and vibrating string extensometer fundamental characteristics contrast table
3. two kinds of sensing systems arrange contrast
3.1 vibrating string extensometer
3.1.1 cable consumption and collecting device quantity survey (surveying)
Through the estimation of Active Reflector system, if all long term monitoring measuring points of this engineering all adopt vibrating string extensometer, Active Reflector health monitoring is totally 545 long-term measuring points.The load capacity upper limit of each coupling box is 20 sensors, and each coupling box stays the redundancy of 4 interfaces, to access other sensors.Need 35 coupling boxes altogether.According to corresponding 10 coupling boxes of each vasculum, choose 4 vasculums.Therefore, 35 line concentrating cases need be laid altogether, 4 vasculums.It lays situation as shown in figure 18.
The wiring estimation principle that cable tension sensor is corresponding is as follows:
Length of arrangement wire=main rope node along downhaul direction to earth anchor spot projection distance+earth anchor spot projection to the distance of nearest coupling box
Collar tie beam and lattice column sensor corresponding wiring estimation principle as follows:
(1) suppose that each lattice column suspension column is 4000mm to nearest coupling box distance
(2) 15700mm is estimated as to the length of corresponding lattice column in the middle part of collar tie beam
(3) lattice column capital sensor wiring total length=capital monitoring point number × (high+4000mm of post)
(4) connect up in the middle part of the corresponding collar tie beam of lattice column to put in the middle part of number × 15700mm+ collar tie beam in the middle part of total length=collar tie beam and put number × (high+4000mm of post)
(5) lattice suspension column sensor wiring total length=suspension column number of probes × 4000mm
According to above principle, needed for this cabling scenario, cable length estimation result is as follows:
Lattice column and collar tie beam long term monitoring measuring point need cable to be always about 3048.02m;
Cable tension sensor needs cable to be always about 18602m;
Between vasculum and line concentrating case, cable overall length is about 4158.2m.
All long-term measuring points all adopt vibrating string extensometer, then need total cable length to be about 25808.22m.
3.1.2 system layout's planning
As shown in figure 19, the vasculum of complete independently shielding processing is positioned over FAST engineering survey and control system (hereinafter referred to as " TT&C system ") relaying outdoor by this arrangement temporarily in the system layout of vibrating string extensometer scheme.Because EMC needs; all line concentrating cases (estimating 35) all need to be designed to shielded box; all cable incoming-outgoing shielded boxes all need to carry out filtering process (containing power lead and signal wire); and line concentrating case power supply all needs to add Surge Protector, carries siganl thunder-proof device in line concentrating case and vasculum.Signal after vasculum enters middle second wife by optical fiber." FAST Active Reflector health monitoring systems " in figure refers to control section of the present invention, and namely " monitoring of software " described in the invention arranged within the system.
3.2 fiber Bragg grating type strainometers
3.2.1 cable consumption and collecting device quantity calculate
Through the estimation of Active Reflector system, according to fiber grating strain meter, each road optical fiber all can be connected 10 sensors (5 measuring points).Active Reflector health monitoring is totally 545 long-term measuring points, and need 111 optical-fibre channels altogether, and can provide 16 passages according to each (FBG) demodulator, need 7 (FBG) demodulators altogether, in order to reserve certain redundance, the program selects 8 (FBG) demodulators.It lays situation as shown in figure 20.
Therefore, the wiring estimation principle that cable tension sensor is corresponding is as follows:
The cabling mode of optical fiber is 5 monitoring points (namely four sections) of passing by rope top line of the net main rope, and then along downhaul to ground.Because artificial cabling grouping workload is huge, so first calculate the distance of the online each node of rope to nearest node in estimation, mean distance is used to replace aerial cable run distance.
Collar tie beam and lattice column sensor corresponding wiring estimation principle as follows:
(1) measuring point number is less than or equal to lattice column or the collar tie beam region of 5, calculates according to optical fiber, from (in the middle part of collar tie beam or capital) end farthest to suspension column.
(2) lattice column of measuring point number between 5 and 10 or collar tie beam region, calculates according to two optical fiber, and one from (in the middle part of collar tie beam or capital) end farthest to suspension column.One from capital to suspension column.
(3) be set to capital distance in the middle part of collar tie beam: 15700mm
According to above principle, needed for this wiring, cable length estimation result is as follows:
Needed for lattice column and collar tie beam long term monitoring measuring point sensor, cable length is about 3348.975m;
Needed for rope monitoring sensor, cable length is about 13161m;
If all long-term measuring points all adopt fiber grating strain meter, then light requirement cable total length is about 16509.975m.
3.1.2 system layout's planning
As shown in figure 21, it is indoor that fiber Bragg grating (FBG) demodulator is positioned over TT&C system relaying by the program in the system layout of fiber grating strain meter scheme.Optical cable can realize effective EMI protect through only adding waveguide during middle second wife.
4 sensor positioning scheme
For all long-term measuring points of Active Reflector health monitoring, according to fiber-optic grating sensor, required cable length (16509.975m) is for adopting 2/3 of cable length (25808.22m) needed for vibrating string type strain timing.From the angle of EMC and loose routing, fiber grating strain meter is lower than the difficulty of construction of vibrating string extensometer, and the cost of traffic filter, siganl thunder-proof device and signal shielding cable can save.
Pre-stage test and investigation show, although the monitor and feedback of vibrating string extensometer is less and application is comparatively extensive, the monitor and feedback of fiber grating strain meter is also within FAST cable force monitoring error range (10%).Therefore, the strain transducer of this engineering is selected to adopt and is counted master with fiber grating strain, counts auxiliary scheme with vibrating string type strain, sensor arrangement principle and result as follows:
Collar tie beam and lattice column length phase strain monitoring point due to distribution looser, wiring difficulty is large, all adopts fiber Bragg grating type sensor.
150, the edge that main rope net is connected with steel ring beam main rope distributes looser, and need monitor when telescope is observed, and all adopts fiber Bragg grating type sensor.
The distribution of main rope net central area is closeer and most of region is in excavation part, main rope and floor level relatively low, and this region comprises the more typical main ropes such as stress amplitude is comparatively large, stress-number of cycles is more, internal force is larger, therefore in observing and controlling second wife ZJ6, ZJ1, ZJ2 tri-around Ge Zhong second wife (reflecting surface A, B, C sector) select 90 measuring points to adopt vibrating string extensometers.
The sensor of the program arranges effect as shown in figure 22.In figure, circle points is select the main rope measuring point of fiber Bragg grating type strainometer, and star point is select the main rope measuring point of vibrating string extensometer.90 the type vibration wire measuring points selected need 3 vasculums and 3 line concentrating cases; For the ease of EMC process, 1 vasculum and 1 line concentrating case can be put together in pairs and carry out shielding processing.If due to a pair vasculum and line concentrating case are put into relaying indoor, then need in middle second wife, open 30 wire holes, and each wire hole all needs plus signal wave filter, the Curve guide impeller of centering second wife and EMC protective treatment affect larger, advise a pair vasculum and line concentrating case design one special shielding cabinet, and be placed on side, middle second wife, then by optical fiber, the data after collection are transferred to relaying indoor, are uploaded to sight chamber by TT&C system wiring.All the other fiber Bragg grating type measuring points need 6 optical fibre interrogation instrument, and optical fibre interrogation instrument is positioned over relaying indoor.
As calculated, according to this scheme, preresearch estimates required wiring total length is as shown in table 5.Long term monitoring needs cable to be about 6236m; Required optical cable is about 15061m.Fiber Bragg grating (FBG) demodulator 6, vibratory string data acquisition device 3, line concentrating case 3.
Table 5 reflecting surface health monitoring systems wiring complete list
In this document, data are calculated to collecting device quantity, length of arrangement wire etc., be FAST Active Reflector system according to the estimation that relevant designing technique document basis is carried out, in Practical Project, have certain deviation.
Described just in order to the present invention is described above, be construed as the present invention and be not limited to above embodiment, meet the various variants of inventive concept all within protection scope of the present invention.
Claims (10)
1.FAST radio telescope health monitor method, it is characterized in that, respectively in the monitoring of radio telescope work progress and use procedure monitoring, by arranging some monitoring points on the net at radio telescope lattice column, collar tie beam, main rope, monitor the force and deformation state at this place, thus monitoring radio telescope safety of structure and dependability.
2. monitoring method as claimed in claim 1, is characterized in that, described work progress monitoring comprises the installation of main rope net and the monitoring of reflecting surface unit lifting work progress.
3. monitoring method as claimed in claim 1, is characterized in that, described use procedure monitoring also comprises environmental monitoring residing for radio telescope, actuator monitoring and the monitoring of main rope net node location.
4. monitoring method as claimed in claim 1, is characterized in that, when described lattice column arranges monitoring point, extract some groups of lattice columns and lay, comprise the lattice column at corresponding main rope host rib place; Choose 1 of described lattice column correspondence ring beam support place girt in the inner part and fall within 2 of basis post limb components in the inner part and arrange measuring point.
5. monitoring method as claimed in claim 1, is characterized in that, when monitoring point arranged by described collar tie beam, comprise the collar tie beam section at corresponding main rope host rib place, arranges measuring point at inner side bearing, outside bearing and collar tie beam span centre.
6. monitoring method as claimed in claim 5, is characterized in that, described inner side bearing: 2 diagonal web members, 1 lower edge hoop chord member;
Described outside bearing: 2 diagonal web members, 1 lower edge hoop chord member;
Described collar tie beam span centre: hoop chord member inside 1 lower edge.
7. monitoring method as claimed in claim 2, it is characterized in that, in described reflecting surface unit lifting work progress monitoring, monitoring point is arranged on collar tie beam winds up twice opposite sex section structural member, the collar tie beam section choosing corresponding main rope host rib place arranges described monitoring point, arranges described monitoring point in reflecting surface unit lifting region simultaneously.
8. monitoring method as claimed in claim 1, is characterized in that, in the guy rope plate node location arrangements monitoring point of described collar tie beam and main rope net junction.
9. monitoring method as claimed in claim 1, it is characterized in that, described main rope net measuring point selection principle is: the edge main rope that main rope net is connected with collar tie beam; Main rope net is near the main rope of central area; Main rope net in operational process STRESS VARIATION amplitude more than the part main rope of 420MPa; More than stress upper limit 400MPa and stress amplitude are more than the main rope of 300MPa.
10. monitoring method as claimed in claim 3, is characterized in that, described actuator monitoring comprises the monitoring of oil pressure, oil temperature, air pressure, temperature and actuator orientation, and wherein the data of oil pressure can be used to the Suo Li calculating downhaul.
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