CN101871947A - Method and device for measuring wind speed in real time - Google Patents
Method and device for measuring wind speed in real time Download PDFInfo
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- CN101871947A CN101871947A CN 200910082094 CN200910082094A CN101871947A CN 101871947 A CN101871947 A CN 101871947A CN 200910082094 CN200910082094 CN 200910082094 CN 200910082094 A CN200910082094 A CN 200910082094A CN 101871947 A CN101871947 A CN 101871947A
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Abstract
The invention relates to a method and a device for measuring wind speed in real time. In the method and the device, an acquisition card is connected with a wind speed sensor and a reset module respectively and is used for receiving a wind speed pulse signal and a reset parameter; a timing module is connected with the acquisition card and is used for receiving a wind speed digital signal and outputting a time control signal; a wind information acquisition and wind speed calculation module is connected with the acquisition card and the timing module respectively and is used for acquiring the wind speed digital signal and the time control signal and outputting a wind speed value; an operating parameter judgment module is connected with the wind information acquisition and wind speed calculation module and is used for receiving the wind speed value and generating the wind speed values with different marks; a wind speed value recording and storing module is connected with the operating parameter judgment module and is used for receiving, recording and storing the wind speed values; a wind speed value transmitting module is connected with the operating parameter judgment module and is used for receiving and transmitting the wind speed values to a computer of a user; and an acquisition card resetting module is connected with the wind information acquisition and wind speed calculation module and is used for receiving the wind speed values and outputting the reset parameter to the acquisition card.
Description
Technical field
The present invention relates to the measuring wind speed technical field, relate to a kind of method and device of measuring wind speed in real time.
Background technology
Along with the continuous development of advanced person's manufacturing and automated control technology, Technology of Precision Measurement also is greatly improved, and corresponding various measuring equipments also constantly update, and modern wind speed measuring equipment, technology also are varied.At some open-air fine-limit works of carrying out for a long time, environment is more abominable, than higher, has a lot of situations to need measuring wind speed to have real-time to the requirement of measuring wind speed, and these measurement data sharing will be got well, and this has proposed following several requirements with regard to giving the measuring wind speed that satisfies these demands:
1. simple, durable, the safety of open-air wind speed collecting part can be worked under various environment for a long time.
2. measuring wind speed has real-time.
3. the air speed value sharing will be got well, and can be transferred to other demands user easily and safely.
What the existing market had can carry out open-air wind speed collection for a long time, and more long-lived measurement products is summed up and is roughly two classes: the one, and vane wind direction measuring instrument, this series products is mostly more durable in use, but the measuring wind speed data sampling rate is low, do not have real-time, and air speed data and demand user Real-Time Sharing ability; The 2nd, small-sized comprehensive weather station, the measurement parameter of this series products is numerous, and the measuring wind speed data sampling does not have real-time yet, and long term exposure is in the open air, and easy disturbed damage is such as thunder and lightning.This comprehensive weather station parameter is many, costs an arm and a leg.
Summary of the invention
At above-mentioned prior art problem, in order to satisfy technical requirement to measuring wind speed, the present invention seeks to propose a kind of measuring wind value that can be real-time, and with these values by network real-time be transferred to other many subscriber computers that have wind speed to need, its cost is low, reliably working under can various out of doors for a long time conditions, the method for the measuring wind speed in real time that is easy to safeguard.
In order to reach described purpose, an aspect of of the present present invention is to propose a kind of measuring wind speed in real time device, and it includes:
Air velocity transducer is gathered wind speed information, output wind speed pulse signal;
Capture card is connected with air velocity transducer, and capture card receives the wind speed pulse signal by signal wire, and the wind speed pulse signal is converted to the wind speed digital signal, and capture card also receives resetting that the capture card reseting module sends parameter is set simultaneously;
Computing machine is connected with capture card, receives the wind speed digital signal, and computing machine carries out computing to the wind speed digital signal and obtains air speed value;
Subscriber computer is connected with computing machine, and subscriber computer receives air speed value by network;
Described computing machine contains:
Time block is connected with capture card, receives the wind speed digital signal, and the output time control signal;
Gathering wind breath and wind speed computing module is connected with time block with capture card respectively, be responsible for gathering the time control signal of wind speed digital signal and time block, make the computing wind speed digital signal of gathering wind breath and the timing in time control signal of wind speed computing module, and the output air speed value;
Operating parameter judgment module is connected with collection wind breath and wind speed computing module, and operating parameter judgment module receives air speed value, and has the operation flag air speed value according to the user's request generation;
Air speed value recorded and stored module is connected with operating parameter judgment module, and air speed value recorded and stored module receives has the operation flag air speed value, and to have operation flag air speed value recorded and stored be the air speed value that has system time information with described;
Send the air speed value module and is connected with operating parameter judgment module, the reception of transmission air speed value module has the operation flag air speed value, and with the air speed value data that receive by the network online in real time export to subscriber computer;
The capture card reseting module is connected with collection wind breath and wind speed computing module, the capture card reseting module receives air speed value, after receiving air speed value,, and will reset and parameter is set exports to capture card, for acquired signal and calculation of wind speed value are prepared next time the capture card setting that resets.
Preferably, described capture card is the PCI-8554 capture card, is made up of separately separate counters and cascade counter; Described separate counters receives the wind speed pulse signal WT and the switch controlling signal S of a certain frequency, and in certain period wind speed pulse signal WT is generated and output wind speed umber of pulse OUT1; Described cascade counter receiving system clock signal T1 and switching signal VCC generate and export the umber of pulse OUT2 with standard clock signal.
Preferably, described cascade counter is made up of first counter and the cascade of second counter acquiescence, described first counter is set to the frequency divider pattern, first counter is with receiving system clock signal T1 and switching signal VCC, clock signal of system T1 generates standard clock signal BT after handling through frequency division; The input end of second counter is connected with the output terminal of first counter, and second counter generates the umber of pulse OUT2 with standard time clock with receiving key signal VCC and standard clock signal BT in certain period.
Preferably, described collection wind breath and wind speed computing module receive the wind speed umber of pulse OUT1 of separate counters in certain period, cascade counter at the umber of pulse OUT2 of this section period internal standard clock and the time control signal of time block, calculate the frequency of wind speed pulse, then according to the standard wind speed pulsed frequency f of air velocity transducer
sWith standard wind speed value v
sContrast relationship carry out linearity and calculate actual measurement air speed value v
w, give the subscriber computer that needs wind speed information by the Network Transmission of safety at last.
In order to reach described purpose, another aspect of the present invention is the method that proposes a kind of measuring wind speed in real time, and performing step is as follows:
Step S1: start measuring wind speed in real time device and stable after, with the time clock input of wind speed pulse signal WT,, start time block with the full sized pules input of clock signal of system T1 as the cascade counter of capture card as the separate counters of capture card;
Step S2: gather wind breath and wind speed computing module and read output valve OUT1, the output valve OUT2 of cascade counter of separate counters in certain period and the time control signal T of time block, the output air speed value; The divider ratio that first counter is set is N
1, be located at the Y of the time control signal of time block
1Constantly, the count value that reads separate counters is N
S1, the count value of fetch stage connection counter is N
S2Be located at the T of the time control signal of time block
2Constantly, the count value that reads separate counters is N
E1, the count value of fetch stage connection counter is N
E2, then from T
1To T
2In the time period Δ t, the output valve OUT1 of the separate counters that collection wind breath and wind speed computing module read is N
E1-N
S1, the output valve OUT2 of cascade counter is N
E2-N
S2, wind speed pulsed frequency f then
WBe calculated as follows:
According to formula Δ t=(N
E2-N
S2) ÷ (8 * 10
6÷ N
1) (1)
f
W＝(N
e1-N
s1)÷Δt (2)
Wind speed pulsed frequency f according to air velocity transducer
sWith standard wind speed value v
sThe table of comparisons, carry out linear interpolation arithmetic, establish the wind speed pulsed frequency f that following formula calculates
WStandard frequency f at air velocity transducer
nWith f
N+1Between, therefore survey wind speed v
wAlso v in the standard wind speed table just
nWith v
N+1Between, then calculate actual measurement wind speed v
wFor:
v
w＝v
n+(v
n+1-v
n)×(f
W-f
n)÷(f
n+1-f
n)(3)；
Step S3: operating parameter judgment module is judged user's operation flag, if operation flag is 1, then changes step S4 over to; If operation flag is 2, then change step S6 over to;
Step S4: air speed value recorded and stored module is put into buffer memory with air speed value, and the wind speed record mark is set is 1;
Step S5: judge whether the air speed value stored record is finished, if finish then change step S8 over to; Continue the air speed value data are carried out stored record if do not finish then change step S4 over to;
Step S6: send the air speed value module and air speed value is sent to subscriber computer, and be provided with that to send Data Labels be 1 by network;
Step S7: judge that air speed value sends to subscriber computer and whether finishes,, then change step S9 over to if finish; If do not finish, then return step S6 and continue to send the air speed value data to subscriber computer;
Step S8: the system time when obtaining real-time measuring wind speed, this time is write file with air speed value, and empty buffer memory, record mark is changed to 0;
Step S9: stop to send data, will send Data Labels and be changed to 0 to subscriber computer;
Step S10: the capture card reseting module carries out parameter, pattern setting to the PCI capture card again;
Step S11: finish.
Preferably, the counting of described separate counters and cascade counter adopts addition or subtraction counting.
Advantage of the present invention: at field environment complicated and changeable, utilize simple, durable, be difficult for disturbed, non-damageable cup type air velocity transducer carries out the wind speed information collection, and WT is sent to capture card with the wind speed pulse signal, and the real-time calculating by the time block in the computing machine comes controlled wind speed realizes that by network wind speed information is shared then.Main advantage is as follows:
1, can be real-time measure calculates air speed value.
2, when real-time when obtaining air speed value, can be real-time carry out Network Transmission, these data are offered other demands user.
3, native system is safe and reliable, and stability is very strong, is not subjected to restraining of environment, operation in the open air for a long time, and cost is low.
Description of drawings
Fig. 1 is the cup type air velocity transducer outside drawing of EL15-type;
Fig. 2 is the one-piece construction figure of wind velocity measurement system of the present invention;
Fig. 3 is a wind velocity signal transfer principle frame diagram;
Fig. 4 is the process flow diagram of the method for measuring wind speed in real time of the present invention;
Fig. 5 is the air speed value of measuring in real time;
The real-time measurement values situation of change of wind speed when Fig. 6 is the aeolian vibration experiment;
The flexible cable system was responding on the directions X under the influence of wind when Fig. 7 A was the aeolian vibration experiment;
Fig. 7 B is that aeolian vibration when experiment flexible cable system ties up to the vibration Frequency Analysis on the directions X under the influence of wind.
Embodiment
Describe each related detailed problem in the technical solution of the present invention in detail below in conjunction with accompanying drawing.Be to be noted that described embodiment only is intended to be convenient to the understanding of the present invention, and it is not played any qualification effect.
Heavy caliber sphere radio telescope (being called for short FAST) is maximum in the world single port footpath telescope, it has several independent innovation gordian techniquies, the gentle rope support system of feed comprising active reflection surface system and optical, mechanical and electronic integration, wind is a key factor that influences these two gordian technique success or failure, and the present invention produces at this project.
Heavily about 30 tons of FAST feed cabin hangs between about 600 meters support tower, moves with the speed less than 11.9mm/s on the about 206 meters spherical crown in 150 meters high aerial bead footpath overhead.That the cabin cable system has is non-linear, the characteristics of large time delay, big inertia and weak rigidity, is the wind sensitive structure, and the spatial positioning accuracy in FAST general requirement feed cabin reaches RMS 4mm, can also guarantee the convenient source of accurately changing simultaneously.Because wind is main vibration interference source, feed cabin, thus to realize large span like this, high-precision real-time dynamic positioning, most important to accurately measuring in real time of wind speed.
The active reflecting surface of FAST is divided into 4600 bead face unit amalgamations and is installed in the depression, platform location, forms initial neutral sphere.When observing, need be real-time by rope net support system, dynamically, high-precision this sphere part is controlled is adjusted into parabola, it is 1mm that precision is adjusted in its control, therefore can influence the stress value of rope web frame in the control procedure apoplexy of reality, thereby can cause the lax or local Suo Yingli of local rope to surpass design load, and the frequency at wind sometimes may be reached resonance with the vibration frequency of rope net, these situations are very big to the harm of total system, do not allow to take place, so the influence of wind increases the design difficulty of whole rope web frame greatly, therefore real-time wind velocity measurement system plays a part very important in the ACTIVE CONTROL process of the pre-research of the whole rope web frame of reflecting surface and reflecting surface.
This real-time measuring wind speed technology comprises air velocity transducer 1, capture card 2, gathers wind breath and wind speed computing module 3, operating parameter judgment module 4, air speed value recorded and stored module 5, sends air speed value module 6, PCI collection reseting module 7 and time block 8;
Described as shown in Figure 1 air velocity transducer 1 adopts cup type air velocity transducer.
Computer A is connected with capture card 2, receives the wind speed digital signal, and computer A is carried out computing to the wind speed digital signal and obtained air speed value;
Subscriber computer B is connected with computer A, and subscriber computer B receives air speed value by network;
Described computer A contains:
Gathering wind breath and wind speed computing module 3 is connected with time block 8 with capture card 2 respectively, be responsible for gathering the time control signal of wind speed digital signal and time block 8, make the computing wind speed digital signal of gathering wind breath and wind speed computing module 3 timing in the control time, and output air speed value, this process is compared with general wind velocity measurement system, advantage is that the user can be provided with collection wind signal according to the demand of oneself, the frequency of calculation of wind speed value, this frequency is changeable, thereby can satisfy the requirement of user from real-time measuring wind speed to different wind speed frequency measurements such as big time spans;
Operating parameter judgment module 4 is connected with collection wind breath and wind speed computing module 3, operating parameter judgment module 4 receives air speed value, operating parameter judgment module 4 generates according to user's needs request to be had the operation flag air speed value and judges processing mode to above-mentioned air speed value: when operating parameter is masked as 1, the air speed value data are carried out recorded and stored; When operating parameter is masked as 2, the air speed value data are sent to subscriber computer B;
Air speed value recorded and stored module 5 is connected with operating parameter judgment module 4, air speed value recorded and stored module 5 receives has the operation flag air speed value, air speed value recorded and stored module 5 purposes are to be the air speed value that has system time information with having operation flag air speed value recorded and stored, because under the operating mode of measuring in real time, data volume is bigger, so air speed value recorded and stored module 5 adopts the binary storage mode that the air speed value data are carried out recording storage;
Send air speed value module 6 and is connected with operating parameter judgment module 4, send air speed value module 6 reception air speed value, transmission air speed value module 6 is to provide air speed value by the network online in real time for subscriber computer B;
Capture card reseting module 7 is connected with collection wind breath and wind speed computing module 3, gather reseting module 7 and be after receiving air speed value capture card 2 setting that resets, and will reset and parameter is set exports to capture card 2, for acquired signal and calculation of wind speed value are prepared next time.
The construction module of specific embodiments is described as follows:
The installation of cup type air velocity transducer 1: cup type air velocity transducer 1 is installed in an outdoor fixed position (this position can be reflected the on-the-spot wind conditions of surveying preferably), guarantees that the vane parts are not subjected to other external force and disturb.
1, select for use durable in use, the air velocity transducer 1 low to environmental requirement, the cup type air velocity transducer of EL15-type for example, the air velocity transducer of selecting 1 is so long as can be applicable to that the cup type air velocity transducer of long-term field work can, the air velocity transducer of other types does not repeat them here, the cup type air velocity transducer of EL15-type is to utilize the vane parts of a low inertia as inductive means, it rotates with the wind and drives the wind speed code-disc and carries out optoelectronic scanning, export corresponding electric impulse signal, by signal wire pulse signal is transferred to capture card 2 simultaneously.
The cup type air velocity transducer 1 of EL15-type mainly comprises vane parts, housing (interior dress wind speed converting unit and heating unit) and socket etc..
The technical indicator of the cup type air velocity transducer 1 of EL15-type is:
Measurement range: 0.3m/s～60m/s
Start wind speed: less than 0.3m/s
Resolving power: 0.05m/s
Rated wind velocity: 75m/s
Accuracy: ± 0.3
Output signal: 0-122Hz
Operating voltage: exchange AC24V heating system direct current DC5-15V wind direction converting system
Environment for use :-40-60 ℃ 0--100%RH
2, capture card 2 adopts the PCI-8554 capture card to receive the wind speed pulse signal and the wind speed pulse signal is carried out conversion process.The PCI-8554 capture card includes separate counters 21 and contains the cascade counter 22 of 8MHz (T1) system clock, cascade counter 22 is actually by first counter 221 and the 222 acquiescence cascades of second counter and forms as shown in Figure 3, utilize cascade counter 22 can export the umber of pulse of clock signal BT accurately, utilize separate counters 21 can export the umber of pulse of wind speed pulse signal WT.
PCI-8554 capture card 2: after with signal wire cup type air velocity transducer 1 and capture card 2 being connected, separate counters on the capture card 2 21 and cascade counter 22 are provided with in computer A.Separate counters 21 is made up of a counter as shown in Figure 3, and two advance one goes out, and cascade counter 22 is become by two counter stage joint groups, and cascade counter 22 contains the system clock of 8MHz.Separate counters 21 is set to the standard output mode, first counter 221 in the cascade counter 22 is set to the frequency divider pattern, second counter 222 is set to the standard output mode.The specific implementation process of separate counters 21 and cascade counter 22 is as follows:
Separate counters 21: the pulse signal that is input as a certain frequency of this separate counters 21, this signal is wind pulse signal WT among the present invention, is output as the umber of pulse OUT1 of this signal in certain period.
Cascade counter 22: because with first counter 221 as frequency divider, so just can obtain a standard time clock output BT after the input of the standard time clock of 8MHz is handled through frequency division, as shown in Figure 3, BT imports as the standard time clock of second counter 222 again, because the mode of operation of second counter 222 is standard output, therefore second counter 222 is output as the wind speed umber of pulse OUT2 of standard time clock BT in certain period, and just cascade counter 22 is output as the umber of pulse OUT2 of standard time clock BT in certain period.
3, calculation control partly is to programme with the VC++ language, has realized friendly visual interactive interface, and easier every function to measuring wind speed is controlled demonstration.Computer A realizes that functional module comprises collection wind breath and wind speed computing module 3, operating parameter judgment module 4, air speed value recorded and stored module 5, sends air speed value module 6, PCI capture card reseting module 7 and time block 8.With cascade counter 22 clock control accurately is benchmark, utilizes the umber of pulse of the wind speed pulse signal WT of separate counters 21 to calculate the frequency of wind speed pulse signal WT, then according to the wind speed pulsed frequency f of air velocity transducer 1 standard
sWith standard wind speed value v
sContrast relationship carry out linearity and calculate actual measurement air speed value v
w, give the subscriber computer B that needs wind speed information by the Network Transmission of safety at last.
Wind gage adopts the method for electronic counter survey frequency at last.Described frequency is exactly the number of times that periodic signal changed in the unit interval (1 second).If remember the repetition change frequency N of this cyclical signal in certain section time interval T, its frequency expression formula is f=N ÷ T, then can obtain the frequency f of this periodic signal.
By above analysis can design wind speed to measure implementation procedure as follows:
(1). with the time clock input of wind speed pulse signal WT, be output as the umber of pulse OUT1 of wind speed pulse signal in certain section time Δ t as separate counters 21; The clock signal of system T1 of 8MHz is output as in the Δ t time period as the full sized pules input of cascade counter 22, the umber of pulse OUT2 of standard clock signal, as shown in Figure 3;
(2). design is gathered wind breath and wind speed computing module 3, operating parameter judgment module 4, air speed value recorded and stored module 5, is sent air speed value module 6, PCI collection reseting module 7 and time block 8;
(3). gather the time control signal that wind breath and wind speed computing module 3 receive time block 8, under the control of the time control signal of time block 8, read the umber of pulse OUT1 of the wind speed pulse WT of separate counters 21 outputs in the Δ t time period simultaneously, the umber of pulse OUT2 of the full sized pules BT of cascade counter 22 outputs;
(4). the standard input pulse signal frequency of first counter 221 of cascade counter 22 is 8MHz, and it is N that divider ratio is set
1So, through the frequency f of the clock signal BT behind the frequency division
TBe f
T=8 * 10
6÷ N
1, suppose that the output pulse number of the cascade counter 22 that obtained by (3) is N in time Δ t
2, i.e. OUT2 described in (3) is so according to formula Δ t=N
2÷ f
TCan calculate this section period Δ t;
(5). because the output of separate counters 21 and cascade counter 22 is gathered wind breath and wind speed computing module 3 to read simultaneously under the control of the time control signal of time block 8, so the time interval Δ t that is calculated by the 4th step also is the time interval of the input wind speed pulse WT umber of pulse of separate counters 21, the umber of pulse that is located at the wind speed pulse WT of separate counters 21 outputs in this time period Δ t is N
3, i.e. OUT1 described in (3), wind speed pulse signal WT frequency is f
W, according to formula f
W=N
3÷ Δ t can calculate the frequency f of wind speed pulse signal WT
WWind speed pulse signal frequency f according to air velocity transducer 1 standard
sWith standard wind speed value v
sThe table of comparisons and wind speed pulse signal frequency f by having calculated
W, promptly can calculate actual measurement air speed value v by linear interpolation arithmetic
w
4, the algorithm of wind measurement method specific implementation and flow process
Gather wind breath and wind speed computing module 3 and read output valve OUT1, the output valve OUT2 of cascade counter 22 of separate counters 21 in certain section time Δ t and the time control signal T of time block 8, the output air speed value.The divider ratio that first counter 221 is set is N
1, be located at the T of the time control signal of time block 8
1Constantly, the count value that reads separate counters 21 is N
S1, the count value of fetch stage connection counter 22 is N
S2Be located at the T of the time control signal of time block 8
2Constantly, the count value that reads separate counters 21 is N
E1, the count value of fetch stage connection counter 22 is N
E2, then from T
1To T
2In the time period Δ t, the output valve OUT1 of the separate counters 21 that collection wind breath and wind speed computing module 3 read is N
E1-N
S1, the output valve OUT2 of cascade counter 22 is N
E2-N
S2, wind speed pulsed frequency f then
WBe calculated as follows:
According to formula Δ t=(N
E2-N
S2) ÷ (8 * 10
6÷ N
1) (1)
f
W＝(N
e1-N
s1)÷Δt (2)
Wind speed pulsed frequency f according to air velocity transducer
sWith air speed value v
sThe table of comparisons, carry out linear interpolation arithmetic, establish the wind speed pulsed frequency f that following formula calculates
WStandard frequency f at air velocity transducer
nWith f
N+1Between, therefore survey wind speed v
wAlso just between standard wind speed v
nV in the table
nWith v
N+1Between, then calculate actual measurement wind speed v
wFor:
v
w＝v
n+(v
n+1-v
n)×(f
W-f
n)÷(f
n+1-f
n)(3)；
Fig. 4 is the process flow diagram that function realizes among the present invention, mainly consists of the following components:
Step S1: start measuring wind speed in real time device and stable after, start time block 8;
Step S2: gather wind breath and wind speed computing module 3 and read the output valve OUT1 of separate counters 21, the output valve OUT2 of cascade counter 22 and the time control signal of time block 8, calculate air speed value v according to above-mentioned formula (1), formula (2), formula (3)
w
Step S3: 4 pairs of user's operation flag of operating parameter judgment module are judged, if operation flag is 1, then change step S4 over to; If operation flag is 2, then change step S6 over to;
Step S4: air speed value recorded and stored module 5 is put into buffer memory with air speed value, and the wind speed record mark is set is 1;
Step S5: judge whether the air speed value stored record is finished, if finish then change step S8 over to; Continue the air speed value data are carried out stored record if do not finish then change step S4 over to;
Step S6: send air speed value module 6 and air speed value is sent to subscriber computer B, and be provided with that to send Data Labels be 1 by network;
Step S7: judge that air speed value sends to subscriber computer B and whether finishes,, then change step S9 over to if finish; If do not finish, then return step S6 and continue to send the air speed value data to subscriber computer B;
Step S8: the system time when obtaining real-time measuring wind speed, this time is write file with air speed value, and empty buffer memory, record mark is changed to 0;
Step S9: stop to send data, will send Data Labels and be changed to 0 to subscriber computer B;
Step S10: capture card reseting module 7 carries out parameter, pattern setting to the PCI capture card again;
Step S11: finish.
5, the shared realization of air speed value
Computer A is carried out with the employing of communicating by letter " TCP/IP network---data message (UDP) mode " of subscriber computer B, reserve a plurality of IP address and port in advance as redundant interface, can be more subscriber computer B service, because the air speed value that obtains is real-time, obtain air speed value so each the subscriber computer B that communicates by letter with computer A can be real-time.
Below be analysis at the experiment of FAST engineering feed cabin rope support system aeolian vibration:
Table 1 is the data analysis of aeolian vibration experiment
LTD500 and APITracker are two kinds of laser trackers in the table, are used to measure the spatial position change of rope system under the aeolian vibration situation.
As can be seen from Table 1, at wind speed is under the situation of 1.56m/s and 1.11m/s, the RMS of position deviation (standard deviation) drops to 0.085mm by 0.16mm, the vibration frequency of two ropes has also diminished simultaneously, this explanation wind has clearly influence to FAST engineering feed cabin rope support system, and especially the influence to position measurement is bigger.Heavily about 30 tons of FAST feed cabin, hang at a distance of between about 600 meters support tower, move with speed on the about 206 meters spherical crown in 150 meters high aerial bead footpath overhead by flexible cable system control cabinet body less than 11.9mm/s, require the spatial positioning accuracy in feed cabin to reach RMS 4mm simultaneously, so realize large span like this, high-precision real-time dynamic positioning, just need control the tension value of adjusting cable system, the movement velocity in feed cabin, the locus in feed cabin at real-time air speed value accurately.At above operating mode the present invention can be real-time the measuring wind value, real-time then send to the in real time accurate space orientation that feed cabin rope control system is finished the feed cabin.
Fig. 5 illustrates the air speed value of real-time measurement;
Fig. 6 is the real-time measurement values curve over time of aeolian vibration when experiment wind speed, and the mean value of related wind speed is 1.11m/s in this curve.
The response of directions X when Fig. 7 A is aeolian vibration, the implication of curve is under the influence of wind among the figure, rope ties up to the amplitude of directions X vibration.See that from curve wind is apparent in view to the influence of FAST feed cabin rope architecture to find out.
The frequency analysis of directions X vibration when Fig. 7 B is aeolian vibration, what this curve reflected is that wind is the influence of vibration frequency to rope.
The above; only be the embodiment among the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with the people of this technology in the disclosed technical scope of the present invention; can understand conversion or the replacement expected; all should be encompassed in of the present invention comprising within the scope, therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (6)
1. the device of a measuring wind speed in real time is characterized in that, contains:
Air velocity transducer is gathered wind speed information, output wind speed pulse signal;
Capture card is connected with air velocity transducer, and capture card receives the wind speed pulse signal by signal wire, and the wind speed pulse signal is converted to the wind speed digital signal, and capture card also receives resetting that the capture card reseting module sends parameter is set simultaneously;
Computing machine is connected with capture card, receives the wind speed digital signal, and computing machine carries out computing to the wind speed digital signal and obtains air speed value;
Subscriber computer is connected with computing machine, and subscriber computer receives air speed value by network;
Described computing machine contains:
Time block is connected with capture card, receives the wind speed digital signal, and the output time control signal;
Gathering wind breath and wind speed computing module is connected with time block with capture card respectively, be responsible for gathering the time control signal of wind speed digital signal and time block, make the computing wind speed digital signal of gathering wind breath and the timing in time control signal of wind speed computing module, and the output air speed value;
Operating parameter judgment module is connected with collection wind breath and wind speed computing module, and operating parameter judgment module receives air speed value, and has the operation flag air speed value according to the user's request generation;
Air speed value recorded and stored module is connected with operating parameter judgment module, and air speed value recorded and stored module receives has the operation flag air speed value, and to have operation flag air speed value recorded and stored be the air speed value that has system time information with described;
Send the air speed value module and is connected with operating parameter judgment module, the reception of transmission air speed value module has the operation flag air speed value, and with the air speed value data that receive by the network online in real time export to subscriber computer;
The capture card reseting module is connected with collection wind breath and wind speed computing module, the capture card reseting module receives air speed value, after receiving air speed value,, and will reset and parameter is set exports to capture card, for acquired signal and calculation of wind speed value are prepared next time the capture card setting that resets.
2. the device of measuring wind speed in real time according to claim 1 is characterized in that, described capture card is the PCI-8554 capture card, is made up of separately separate counters and cascade counter; Described separate counters receives the wind speed pulse signal WT and the switch controlling signal S of a certain frequency, and in certain period wind speed pulse signal WT is generated and output wind speed umber of pulse OUT1; Described cascade counter receiving system clock signal T1 and switching signal VCC generate and export the umber of pulse OUT2 with standard clock signal.
3. the device of measuring wind speed in real time according to claim 2, it is characterized in that, described cascade counter is made up of first counter and the cascade of second counter acquiescence, described first counter is set to the frequency divider pattern, first counter is with receiving system clock signal T1 and switching signal VCC, clock signal of system T1 generates standard clock signal BT after handling through frequency division; The input end of second counter is connected with the output terminal of first counter, and second counter generates the umber of pulse OUT2 with standard time clock with receiving key signal VCC and standard clock signal BT in certain period.
4. the device of measuring wind speed in real time according to claim 1, it is characterized in that, described collection wind breath and wind speed computing module receive the wind speed umber of pulse OUT1 of separate counters in certain period, cascade counter at the umber of pulse OUT2 of this section period internal standard clock and the time control signal of time block, calculate the frequency of wind speed pulse, then according to the standard wind speed pulsed frequency f of air velocity transducer
sWith standard wind speed value v
sContrast relationship carry out linearity and calculate actual measurement air speed value v
w, give the subscriber computer that needs wind speed information by the Network Transmission of safety at last.
5. the method for a measuring wind speed in real time is characterized in that, performing step is as follows:
Step S1: start measuring wind speed in real time device and stable after, with the time clock input of wind speed pulse signal WT,, start time block with the full sized pules input of clock signal of system T1 as the cascade counter of capture card as the separate counters of capture card;
Step S2: gather wind breath and wind speed computing module and read output valve OUT1, the output valve OUT2 of cascade counter of separate counters in certain period and the time control signal T of time block, the output air speed value; The divider ratio that first counter is set is N
1, be located at the T of the time control signal of time block
1Constantly, the count value that reads separate counters is N
S1, the count value of fetch stage connection counter is N
S2Be located at the T of the time control signal of time block
2Constantly, the count value that reads separate counters is N
E1, the count value of fetch stage connection counter is N
E2, then from T
1To T
2In the time period Δ t, the output valve OUT1 of the separate counters that collection wind breath and wind speed computing module read is N
E1-N
S1, the output valve OUT2 of cascade counter is N
E2-N
S2, wind speed pulsed frequency f then
WBe calculated as follows:
According to formula Δ t=(N
E2-N
S2) ÷ (8 * 10
6÷ N
1) (1)
f
W＝(N
e1-N
s1)÷Δt (2)
Wind speed pulsed frequency f according to air velocity transducer
sWith standard wind speed value v
sThe table of comparisons, carry out linear interpolation arithmetic, establish the wind speed pulsed frequency f that following formula calculates
WStandard frequency f at air velocity transducer
nWith f
N+1Between, therefore survey wind speed v
wAlso v in the standard wind speed table just
nWith v
N+1Between, then calculate actual measurement wind speed v
wFor:
v
w＝v
n+(v
n+1-v
n)×(f
W-f
n)÷(f
n+1-f
n)(3)；
Step S3: operating parameter judgment module is judged user's operation flag, if operation flag is 1, then changes step S4 over to; If operation flag is 2, then change step S6 over to;
Step S4: air speed value recorded and stored module is put into buffer memory with air speed value, and the wind speed record mark is set is 1;
Step S5: judge whether the air speed value stored record is finished, if finish then change step S8 over to; Continue the air speed value data are carried out stored record if do not finish then change step S4 over to;
Step S6: send the air speed value module and air speed value is sent to subscriber computer, and be provided with that to send Data Labels be 1 by network;
Step S7: judge that air speed value sends to subscriber computer and whether finishes,, then change step S9 over to if finish; If do not finish, then return step S6 and continue to send the air speed value data to subscriber computer;
Step S8: the system time when obtaining real-time measuring wind speed, this time is write file with air speed value, and empty buffer memory, record mark is changed to 0;
Step S9: stop to send data, will send Data Labels and be changed to 0 to subscriber computer;
Step S10: the capture card reseting module carries out parameter, pattern setting to the PCI capture card again;
Step S11: finish.
6. according to the method for the described measuring wind speed in real time of claim 5, it is characterized in that the counting of described separate counters and cascade counter adopts addition or subtraction counting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910082094 CN101871947B (en) | 2009-04-22 | 2009-04-22 | Method and device for measuring wind speed in real time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910082094 CN101871947B (en) | 2009-04-22 | 2009-04-22 | Method and device for measuring wind speed in real time |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101871947A true CN101871947A (en) | 2010-10-27 |
| CN101871947B CN101871947B (en) | 2012-08-29 |
Family
ID=42996933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910082094 Expired - Fee Related CN101871947B (en) | 2009-04-22 | 2009-04-22 | Method and device for measuring wind speed in real time |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101871947B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290971A (en) * | 2016-08-26 | 2017-01-04 | 东南大学 | System measured by a kind of wind speed ball |
| CN109243298A (en) * | 2018-09-17 | 2019-01-18 | 北海华源电子有限公司 | The outdoor electronic of rotatable wind sheltering shows device |
| CN109425915A (en) * | 2017-08-27 | 2019-03-05 | 南京乐朋电子科技有限公司 | A kind of mimicry thin clouds are as arrangement for detecting |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE435326B (en) * | 1982-12-07 | 1984-09-17 | Mats Edvin Hurtig | DEVICE TO MEASURE WIND SPEED AND / OR DIRECTION |
| CN201188108Y (en) * | 2008-04-28 | 2009-01-28 | 上海海事大学 | Detector with network interface for wind direction and wind speed |
-
2009
- 2009-04-22 CN CN 200910082094 patent/CN101871947B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290971A (en) * | 2016-08-26 | 2017-01-04 | 东南大学 | System measured by a kind of wind speed ball |
| CN106290971B (en) * | 2016-08-26 | 2020-04-03 | 东南大学 | Anemoscope measuring system |
| CN109425915A (en) * | 2017-08-27 | 2019-03-05 | 南京乐朋电子科技有限公司 | A kind of mimicry thin clouds are as arrangement for detecting |
| CN109243298A (en) * | 2018-09-17 | 2019-01-18 | 北海华源电子有限公司 | The outdoor electronic of rotatable wind sheltering shows device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101871947B (en) | 2012-08-29 |
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