CN114279676B - Sea state threshold value judging method for strain damage of submarine suspended cable - Google Patents
Sea state threshold value judging method for strain damage of submarine suspended cable Download PDFInfo
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Abstract
The application provides a sea state threshold value judging method for strain damage of a submarine suspended cable, which comprises the following steps: obtaining a plurality of parameter ranges for submarine cable strain experiments and cable physical characteristic parameter values of the submarine cable; dividing working conditions to be evaluated, and determining a working condition parameter combination sequence corresponding to each working condition to be evaluated; determining a test scale; acquiring an experimental working condition parameter combination sequence corresponding to an experimental working condition corresponding to each working condition to be evaluated and acquiring an experimental submarine cable; strain monitoring is carried out on the experimental submarine cable in a wave water tank; the strain value of the submarine cable for experiment is acquired through a strain gauge; and acquiring a critical sea state threshold of the submarine cable based on the strain values acquired by the experimental working conditions and a preset damage evaluation rule. The method provides basis for path selection of the submarine cable, cable selection, operation safety evaluation in the suspended section of the submarine cable, and the like.
Description
Technical Field
The application relates to the technical field of cable experiments, in particular to a sea state threshold judgment method for strain damage of a submarine suspended cable.
Background
The submarine cable is often tens of kilometers in length or even longer, a specific position of a fault point in water can be found through various means once damage occurs, salvage and repair are implemented, the maintenance period is long, the requirements of users in a power supply area are influenced if the submarine cable is light, a channel is seriously required to be closed, and large-scale economic loss and social influence are caused. Strain damage to a submarine cable under wave action is an important aspect of submarine cable damage.
At present, the influence factors and the threshold value of the strain damage of the submarine cable under the wave action are not known, so that the influence factors and the threshold value of the strain damage of the submarine cable under the wave action are required to be researched, and the submarine cable designed or operated by the cable is prevented from being strained or damaged due to the wave action due to suspension, so that accident hazard is caused.
Disclosure of Invention
The application provides a sea condition threshold judging method for strain damage of a submarine suspended cable, which provides basis for submarine cable path selection, cable selection, operation safety evaluation in a submarine cable suspended section operation and the like. The technical scheme of the application is as follows:
the embodiment of the application provides a sea state threshold value judging method for strain damage of a submarine suspended cable, which comprises the following steps:
Obtaining a plurality of parameter ranges for submarine cable strain experiments and cable physical characteristic parameter values of the submarine cable;
Dividing working conditions to be evaluated based on the parameter ranges, and determining a working condition parameter combination sequence corresponding to each working condition to be evaluated;
determining a test scale based on the cable physical property parameter value and the plurality of parameter ranges;
based on the test scale and the working condition parameter combination sequence, acquiring an experimental working condition parameter combination sequence corresponding to the experimental working condition corresponding to each working condition to be evaluated;
Acquiring target physical characteristics of the submarine cable for experiment based on the test scale and the cable physical characteristic parameter value and acquiring the submarine cable for experiment based on the target physical characteristics;
for each experimental working condition, based on an experimental working condition parameter combination sequence corresponding to the experimental working condition, strain monitoring is carried out on the experimental submarine cable in the wave water tank; the strain value of the submarine cable for experiment is acquired through a strain gauge;
And acquiring a critical sea state threshold of the submarine cable based on the strain values acquired by the experimental working conditions and a preset damage evaluation rule.
In some embodiments of the application, the plurality of parameter ranges includes a parameter range of wave characteristics and sea area relief evolution characteristics of the submarine cable operational sea area and a sea area water depth parameter range; the wave characteristics comprise wave height parameters and wave period parameters, and the sea area landform evolution characteristics comprise bed flushing depth parameters and bed flushing width parameters; dividing working conditions to be evaluated based on the parameter ranges, and determining a working condition parameter combination sequence corresponding to each working condition to be evaluated, wherein the working condition parameter combination sequence comprises the following steps:
determining respective parameter ranges of the wave height parameter, the wave period parameter, the bed flushing depth parameter and the bed flushing width parameter;
Dividing respective parameter ranges of the wave height parameter, the wave period parameter, the bed flushing depth parameter and the bed flushing width parameter and the sea water depth parameter range according to preset intervals, and obtaining respective sequence values of the wave height parameter, the wave period parameter, the bed flushing depth parameter, the bed flushing width parameter and the sea water depth parameter;
Acquiring sequence values of sea cable suspension height parameters and sea cable suspension span parameters according to the sequence values of the bottom bed flushing depth parameters and the bed surface flushing width parameters;
And arranging and combining the respective sequence values of the wave height parameter, the wave period parameter, the sea area water depth parameter, the sea cable suspension height parameter and the sea cable suspension span parameter, dividing the working condition to be evaluated based on the arrangement and combination, and acquiring a working condition parameter combination sequence of each working condition to be evaluated.
In some embodiments of the present application, for each experimental working condition, strain monitoring is performed on the experimental cable in the wave water tank based on the experimental working condition parameter combination sequence corresponding to the experimental working condition; and the strain value of the submarine cable for experiments is acquired through the strain gauge, and the method comprises the following steps:
Erecting the submarine cable for experiment at the position of an experimental section of a wave water tank, and setting the submarine cable for experiment according to the sequence values of the submarine cable suspension height parameter and the submarine cable suspension span parameter in the experimental working condition parameter combination sequence;
Attaching strain gauges at a plurality of positions of the experimental submarine cable, wherein the strain gauges are connected with a signal receiving device;
adding water into the wave water tank according to sea water depth parameters in the experimental working condition parameter combination sequence, and standing until no wave exists;
according to the sequence values of the wave height parameter and the wave period parameter in the experimental working condition parameter combination sequence, waves are manufactured in the wave water tank through a wave manufacturing plate so that the experimental submarine cable is subjected to periodic strain;
and transmitting the data acquired by the strain gauge to the signal receiving device according to a preset acquisition frequency to acquire the strain value of the submarine cable for experiments.
In some embodiments of the present application, the obtaining the critical sea state threshold of the submarine cable based on the strain values obtained in the plurality of experimental conditions and the preset damage evaluation rule includes:
acquiring a target sequence of the time change of the strain value of each experimental working condition in the plurality of experimental working conditions;
Based on the target sequence, a first strain value and a significance frequency value of the accumulated frequency corresponding to a preset frequency threshold value are obtained;
And acquiring a critical sea state threshold value of the submarine cable based on the first strain values and the significance frequency values of the experimental working conditions and a preset damage evaluation rule.
In some embodiments of the present application, the obtaining the critical sea state threshold of the submarine cable based on the first strain values and the significance frequency values of the plurality of experimental conditions and the preset damage evaluation rule includes:
Determining a target strain value meeting a first rule among first strain values of a plurality of experimental working conditions; or determining a target significance frequency value meeting a second rule among significance frequency values of a plurality of experimental working conditions; wherein the first rule comprises that the first strain value is larger than or equal to a strain threshold allowed by the material of the submarine cable, and the second rule comprises that the significance frequency value is smaller than a preset multiple of the natural vibration frequency of the submarine cable;
determining a target to-be-evaluated working condition corresponding to the target strain value or the experimental working condition corresponding to the target significance frequency value;
And taking the working condition parameter combination sequence corresponding to the target working condition to be evaluated as a critical sea condition threshold value of the submarine cable.
In some embodiments of the application, the determining the test scale based on the cable physical property parameter values and the plurality of parameter ranges comprises:
And determining the test scale based on the cable physical characteristic parameter value, the wave height parameter, the wave period parameter, the sea water depth parameter, the sea cable suspension height parameter and the sea cable suspension span parameter.
In some embodiments of the application, the cable physical characteristics of the submarine cable include outer diameter, mass per unit length, modulus of elasticity, lay-down pattern, and depth of embedment; the obtaining the target physical characteristics of the submarine cable for experiments based on the test scale and the cable physical characteristic parameter value and obtaining the submarine cable for experiments based on the target physical characteristics comprises the following steps:
Acquiring target physical characteristics of the experimental submarine cable based on the elastic modulus and the test scale of the submarine cable, wherein the target physical characteristics comprise the outer diameter, the mass per unit length, the elastic modulus and the embedding depth of the experimental submarine cable;
And manufacturing the submarine cable for experiments based on the target physical characteristics.
In some embodiments of the application, the making of the experimental submarine cable comprises:
Selecting a polyvinyl chloride (PVC) pipe;
and filling lead particles into the PVC pipe to obtain the submarine cable for experiments.
In some embodiments of the application, the obtaining a plurality of parameter ranges for submarine cable strain experiments comprises:
Acquiring the variation ranges of a plurality of parameters for submarine cable strain experiments;
And obtaining the plurality of parameter ranges based on the variation range.
In some embodiments of the present application, after attaching the strain gauge at a plurality of positions of the experimental submarine cable, the method further comprises:
and waterproof sealing is carried out on the strain gauge by adopting a thermoplastic sealing film.
Based on the technical scheme, the method solves the problem of the suspended strain damage threshold of the submarine cable in the wave environment, and provides basis for path selection of the submarine cable, cable selection, operation safety evaluation on the suspended section of the submarine cable, and the like. Therefore, the path can be optimized, and the easy-to-hang section wiring is avoided; a more suitable submarine cable can be selected, so that unnecessary investment is reduced, and engineering cost is lowered; whether the system is safe to operate or not can be judged rapidly and efficiently, a management building unit is reminded of timely taking protective measures, and faults are effectively avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application and do not constitute a undue limitation on the application.
Fig. 1 is a schematic flow chart of a sea state threshold determination method for strain damage of a subsea suspension cable according to an embodiment of the application.
Detailed Description
In order to enable a person skilled in the art to better understand the technical solutions of the present application, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that the terms "first," "second," and the like herein are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.
The embodiment of the application provides a sea state threshold value judging method for strain damage of a submarine suspended cable, which is shown in fig. 1 and comprises the following steps:
Step 101, obtaining a plurality of parameter ranges for submarine cable strain experiments and cable physical characteristic parameter values of the submarine cable;
in the embodiment of the application, the plurality of parameter ranges comprise parameter ranges of wave characteristics and sea area relief evolution characteristics of the submarine cable operation sea area and sea area water depth parameter ranges; the wave characteristics comprise wave height parameters and wave period parameters, and the sea area landform evolution characteristics comprise bed flushing depth parameters and bed flushing width parameters. The cable physical characteristic parameters of the submarine cable comprise an outer diameter, unit length mass, elastic modulus, laying mode and embedding depth.
Optionally, the obtaining a plurality of parameter ranges for submarine cable strain experiments includes:
Acquiring the variation ranges of a plurality of parameters for submarine cable strain experiments;
And obtaining the plurality of parameter ranges based on the variation range.
Optionally, the change ranges of the parameters are obtained by collecting and sorting data of aspects such as wave characteristics of submarine cable laying and operation sea areas, sea area landform evolution characteristics, sea area water depth characteristics, cable physical characteristics of submarine cables and the like.
102, Dividing working conditions to be evaluated based on the parameter ranges, and determining a working condition parameter combination sequence corresponding to each working condition to be evaluated;
In the embodiment of the present application, the dividing the working conditions to be evaluated based on the parameter ranges, and determining a working condition parameter combination sequence corresponding to each working condition to be evaluated includes:
determining respective parameter ranges of the wave height parameter, the wave period parameter, the bed flushing depth parameter and the bed flushing width parameter;
Dividing respective parameter ranges of the wave height parameter, the wave period parameter, the bed flushing depth parameter and the bed flushing width parameter and the sea water depth parameter range according to preset intervals, and obtaining respective sequence values of the wave height parameter, the wave period parameter, the bed flushing depth parameter, the bed flushing width parameter and the sea water depth parameter;
in the present application, a submarine cable is simply referred to as a submarine cable in some cases.
Acquiring sequence values of sea cable suspension height parameters and sea cable suspension span parameters according to the sequence values of the bottom bed flushing depth parameters and the bed surface flushing width parameters;
And arranging and combining the respective sequence values of the wave height parameter, the wave period parameter, the sea area water depth parameter, the sea cable suspension height parameter and the sea cable suspension span parameter, dividing the working condition to be evaluated based on the arrangement and combination, and acquiring a working condition parameter combination sequence of each working condition to be evaluated.
For example, the wave height range H min～Hmax, the wave period range T min～Tmax, the water depth range D min～Dmax, the bed flush depth range E min～Emax, and the bed flush width range L min～Lmax are specified.
Thus, each parameter is divided at a certain interval to form a sequence value corresponding to each parameter.
① The wave height takes 0.5m as interval, and corresponds to the parameter sequence:
Hmin、H1＝Hmin+0.5、H2＝H1+0.5、......、Hmax＝Hn1＝Hn1-1+0.5
② The wave period takes 1s as interval, and corresponds to a parameter sequence:
Tmin、T1＝Tmin+1、T2＝T1+1、......、Tmax＝Tn2＝Tn2-1+1
③ The water depth takes 2m as interval, and corresponds to the parameter sequence:
Dmin、D1＝Dmin+2、D2＝D1+2、......、Dmax＝Dn3＝Dn3-1+2
④ The bottom bed flushing depth takes 0.5m as interval, and corresponds to a parameter sequence:
Emin、E1＝Emin+0.5、E2＝E1+0.5、......、Emax＝En4＝En4-1+0.5
⑤ The bottom flushing width takes 1m as interval, and corresponds to parameter sequences:
Lmin、L1＝Lmin+1、L2＝L1+1、......、Tmax＝Ln5＝Ln5-1+1
On the basis, the suspension height and suspension span of the submarine cable are determined according to the following steps,
Wherein K i is the suspension span value of the ith submarine cable in the corresponding parameter sequence, and the unit is m; l i is the corresponding ith bed flushing width value in the corresponding parameter sequence, and the unit is m; n5 is the grouping number of the bottom bed flushing width in the parameter sequence; g i is the suspension height value of the ith sea cable in the corresponding parameter sequence, and the unit is m; e i is the ith bed flushing depth value in the corresponding parameter sequence, and the unit is m; m is the sea cable embedding depth, and the unit is M; n4 is the number of packets of the depth of bed flushing in the parametric sequence.
Thus, aiming at wave height, wave period, water depth, sea cable suspension span and sea cable suspension height, the method comprises the following steps ofThe method comprises the steps of arranging and combining, dividing working conditions to be evaluated, and forming a working condition combination sequence.
Step 103, determining a test scale based on the cable physical characteristic parameter value and the parameter ranges;
In an embodiment of the present application, the determining the test scale based on the cable physical characteristic parameter value and the plurality of parameter ranges includes:
And determining the test scale based on the cable physical characteristic parameter value, the wave height parameter, the wave period parameter, the sea water depth parameter, the sea cable suspension height parameter and the sea cable suspension span parameter.
And determining the test scale according to the physical characteristics, the suspension state, the sea water depth and the wave element parameter value range of the actual submarine cable.
Step 104, based on the test scale and the working condition parameter combination sequence, obtaining an experimental working condition parameter combination sequence corresponding to the experimental working condition corresponding to each working condition to be evaluated;
and calculating wave height, wave period, water depth, flushing width and the like corresponding to each test working condition according to the scale theory of the physical model.
Step 105, acquiring target physical characteristics of the submarine cable for experiment based on the test scale and the cable physical characteristic parameter value and acquiring the submarine cable for experiment based on the target physical characteristics;
According to the scale theory of the physical model, according to the elastic modulus of the submarine cable, the elastic modulus, the outer diameter, the unit mass, the submarine cable embedding depth and the like of the submarine cable for the test are calculated according to the scale.
In an embodiment of the present application, the obtaining the target physical characteristics of the submarine cable for experiment based on the test scale and the cable physical characteristic parameter value and obtaining the submarine cable for experiment based on the target physical characteristics includes:
Acquiring target physical characteristics of the experimental submarine cable based on the elastic modulus and the test scale of the submarine cable, wherein the target physical characteristics comprise the outer diameter, the mass per unit length, the elastic modulus and the embedding depth of the experimental submarine cable;
And manufacturing the submarine cable for experiments based on the target physical characteristics.
Optionally, the manufacturing the submarine cable for experiments includes:
Selecting a polyvinyl chloride (PVC) pipe;
and filling lead particles into the PVC pipe to obtain the submarine cable for experiments.
According to the embodiment, according to the elastic modulus, the outer diameter and the unit mass value of the submarine cable for test, the PVC pipe is filled with lead particles to manufacture the corresponding submarine cable for test, so that the submarine cable for test has the corresponding elastic modulus, the outer diameter and the unit mass.
Step 106, for each experimental working condition, based on the experimental working condition parameter combination sequence corresponding to the experimental working condition, strain monitoring is carried out on the experimental submarine cable in the wave water tank; the strain value of the submarine cable for experiment is acquired through a strain gauge;
in the embodiment of the application, for each experimental working condition, strain monitoring is carried out on the experimental cable in the wave water tank based on the experimental working condition parameter combination sequence corresponding to the experimental working condition; and the strain value of the submarine cable for experiments is acquired through the strain gauge, and the method comprises the following steps:
Erecting the submarine cable for experiment at the position of an experimental section of a wave water tank, and setting the submarine cable for experiment according to the sequence values of the submarine cable suspension height parameter and the submarine cable suspension span parameter in the experimental working condition parameter combination sequence;
Attaching strain gauges at a plurality of positions of the experimental submarine cable, wherein the strain gauges are connected with a signal receiving device;
adding water into the wave water tank according to sea water depth parameters in the experimental working condition parameter combination sequence, and standing until no wave exists;
according to the sequence values of the wave height parameter and the wave period parameter in the experimental working condition parameter combination sequence, waves are manufactured in the wave water tank through a wave manufacturing plate so that the experimental submarine cable is subjected to periodic strain;
and transmitting the data acquired by the strain gauge to the signal receiving device according to a preset acquisition frequency to acquire the strain value of the submarine cable for experiments.
Optionally, a fixing frame is used for arranging the submarine cable for experiments at the center of the test section of the wave water tank, strain gauges are respectively stuck on the middle part, the upper part, the lower part, the front part and the rear part of the 1/3 section and the 2/3 section of the submarine cable for experiments, and a thermoplastic sealing film is used for carrying out waterproof sealing on the strain gauges.
Optionally, wave height meters are respectively arranged 1m, 0m and-1 m in front of the center position of the test section of the water tank, and the wave height meters are connected with the signal receiving device.
The static-wave-free state is to wait for the water surface to be static until the wave surface cannot be observed by naked eyes.
Alternatively, the electric control wave-making plate is used for generating corresponding wave height and wave period and enabling the wave height and the wave period to impact the experimental submarine cable of the water tank test section, so that the submarine cable is periodically strained.
Optionally, the strain value of the submarine cable for experiment under the wave action is monitored in real time at the acquisition frequency of 200-1000 Hz, and the signal is transmitted to the signal receiving device. The signal acquisition frequency is set according to the natural frequency of the submarine cable for experiments, and is calculated by the following formula,
Wherein P is the acquisition frequency in Hz; p 0 is the natural frequency of the submarine cable for experiments, and the unit is Hz; t is the wave period.
Optionally, the signal receiving device displays the strain signals at different positions of the submarine cable for experiment on a computer screen in a pattern and list mode. The test duration of each test condition is not less than 5 minutes.
And step 107, acquiring a critical sea state threshold value of the submarine cable based on the strain values acquired in a plurality of experimental working conditions and a preset damage evaluation rule.
In an embodiment of the present application, the obtaining the critical sea state threshold of the submarine cable based on the strain values obtained in the multiple experimental conditions and the preset damage evaluation rule includes:
acquiring a target sequence of the time change of the strain value of each experimental working condition in the plurality of experimental working conditions;
Based on the target sequence, a first strain value and a significance frequency value of the accumulated frequency corresponding to a preset frequency threshold value are obtained;
And acquiring a critical sea state threshold value of the submarine cable based on the first strain values and the significance frequency values of the experimental working conditions and a preset damage evaluation rule.
The preset damage evaluation rule comprises a first rule and a second rule.
Optionally, the obtaining the critical sea state threshold of the submarine cable based on the first strain values and the significance frequency values of the plurality of experimental conditions and the preset damage evaluation rule includes:
Determining a target strain value meeting a first rule among first strain values of a plurality of experimental working conditions; or determining a target significance frequency value meeting a second rule among significance frequency values of a plurality of experimental working conditions; wherein the first rule comprises that the first strain value is larger than or equal to a strain threshold allowed by the material of the submarine cable, and the second rule comprises that the significance frequency value is smaller than a preset multiple of the natural vibration frequency of the submarine cable;
determining a target to-be-evaluated working condition corresponding to the target strain value or the experimental working condition corresponding to the target significance frequency value;
And taking the working condition parameter combination sequence corresponding to the target working condition to be evaluated as a critical sea condition threshold value of the submarine cable.
Optionally, the preset frequency threshold is 50%, the significance frequency value includes a plurality of preset multiples of 1.5 times. And recording a strain value corresponding to 50% of the corresponding cumulative frequency of each test working condition and 1 st to 2 nd significance frequency values of the strain.
Optionally, the preset multiple is 1.5 times, and the second rule is that the 1 st to 2 nd significance frequency value is within 1.5 times of the natural vibration frequency of the submarine cable.
At this time, the corresponding parameter conditions, such as wave height, wave period, water depth, sea cable suspension height, suspension span length, etc., namely the sequence value, are critical sea condition thresholds which may cause damage to the sea cable.
The method solves the problem of suspended strain damage threshold of the submarine cable in the wave environment, and the suspended submarine cable model is placed in the wave water tank by a physical model scale scaling method to directly observe the strain of the submarine cable. On one hand, the real process of the vibration strain of the submarine cable caused by the wave under the actual sea condition can be conveniently reproduced, and on the other hand, the direct and sustainable observation of the strain under the wave action of the submarine cable can be realized. The problem that the suspended strain of the submarine cable is difficult to observe directly in an actual field environment is solved, and meanwhile, the threshold value observation on the strain damage of the submarine cable can be realized. Providing basis for submarine cable path selection, cable selection, running safety evaluation in the suspended section of the running submarine cable, and the like. Therefore, the path can be optimized, and the easy-to-hang section wiring is avoided; a more suitable submarine cable can be selected, so that unnecessary investment is reduced, and engineering cost is lowered; whether the system is safe to operate or not can be judged rapidly and efficiently, a management building unit is reminded of timely taking protective measures, and faults are effectively avoided.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. The specification and examples are to be regarded in an illustrative manner only.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (8)
1. The sea condition threshold judging method for the strain damage of the submarine suspended cable is characterized by comprising the following steps of:
Obtaining a plurality of parameter ranges for submarine cable strain experiments and cable physical characteristic parameter values of the submarine cable;
Dividing working conditions to be evaluated based on the parameter ranges, and determining a working condition parameter combination sequence corresponding to each working condition to be evaluated;
determining a test scale based on the cable physical property parameter value and the plurality of parameter ranges;
based on the test scale and the working condition parameter combination sequence, acquiring an experimental working condition parameter combination sequence corresponding to the experimental working condition corresponding to each working condition to be evaluated;
Acquiring target physical characteristics of the submarine cable for experiment based on the test scale and the cable physical characteristic parameter value and acquiring the submarine cable for experiment based on the target physical characteristics;
for each experimental working condition, based on an experimental working condition parameter combination sequence corresponding to the experimental working condition, strain monitoring is carried out on the experimental submarine cable in the wave water tank; the strain value of the submarine cable for experiment is acquired through a strain gauge;
acquiring a critical sea state threshold of the submarine cable based on the strain values acquired by a plurality of experimental working conditions and a preset damage evaluation rule;
the obtaining the critical sea state threshold of the submarine cable based on the strain values obtained by a plurality of experimental working conditions and the preset damage evaluation rule comprises the following steps:
acquiring a target sequence of the time change of the strain value of each experimental working condition in the plurality of experimental working conditions;
Based on the target sequence, a first strain value and a significance frequency value of the accumulated frequency corresponding to a preset frequency threshold value are obtained;
Determining a target strain value meeting a first rule among first strain values of a plurality of experimental working conditions; or determining a target significance frequency value meeting a second rule among significance frequency values of a plurality of experimental working conditions; wherein the first rule comprises that the first strain value is larger than or equal to a strain threshold allowed by the material of the submarine cable, and the second rule comprises that the significance frequency value is smaller than a preset multiple of the natural vibration frequency of the submarine cable;
determining a target to-be-evaluated working condition corresponding to the target strain value or the experimental working condition corresponding to the target significance frequency value;
And taking the working condition parameter combination sequence corresponding to the target working condition to be evaluated as a critical sea condition threshold value of the submarine cable.
2. The method of claim 1, wherein the plurality of parameter ranges includes a parameter range of wave characteristics and sea land relief evolution characteristics of a submarine cable operational sea area and a sea water depth parameter range; the wave characteristics comprise wave height parameters and wave period parameters, and the sea area landform evolution characteristics comprise bed flushing depth parameters and bed flushing width parameters; dividing working conditions to be evaluated based on the parameter ranges, and determining a working condition parameter combination sequence corresponding to each working condition to be evaluated, wherein the working condition parameter combination sequence comprises the following steps:
determining respective parameter ranges of the wave height parameter, the wave period parameter, the bed flushing depth parameter and the bed flushing width parameter;
Dividing respective parameter ranges of the wave height parameter, the wave period parameter, the bed flushing depth parameter and the bed flushing width parameter and the sea water depth parameter range according to preset intervals, and obtaining respective sequence values of the wave height parameter, the wave period parameter, the bed flushing depth parameter, the bed flushing width parameter and the sea water depth parameter;
Acquiring sequence values of sea cable suspension height parameters and sea cable suspension span parameters according to the sequence values of the bottom bed flushing depth parameters and the bed surface flushing width parameters;
And arranging and combining the respective sequence values of the wave height parameter, the wave period parameter, the sea area water depth parameter, the sea cable suspension height parameter and the sea cable suspension span parameter, dividing the working condition to be evaluated based on the arrangement and combination, and acquiring a working condition parameter combination sequence of each working condition to be evaluated.
3. The method according to claim 2, wherein for each experimental condition, strain monitoring is performed on the experimental cable in the wave water tank based on the experimental condition parameter combination sequence corresponding to the experimental condition; and the strain value of the submarine cable for experiments is acquired through the strain gauge, and the method comprises the following steps:
Erecting the submarine cable for experiment at the position of an experimental section of a wave water tank, and setting the submarine cable for experiment according to the sequence values of the submarine cable suspension height parameter and the submarine cable suspension span parameter in the experimental working condition parameter combination sequence;
Attaching strain gauges at a plurality of positions of the experimental submarine cable, wherein the strain gauges are connected with a signal receiving device;
adding water into the wave water tank according to sea water depth parameters in the experimental working condition parameter combination sequence, and standing until no wave exists;
according to the sequence values of the wave height parameter and the wave period parameter in the experimental working condition parameter combination sequence, waves are manufactured in the wave water tank through a wave manufacturing plate so that the experimental submarine cable is subjected to periodic strain;
and transmitting the data acquired by the strain gauge to the signal receiving device according to a preset acquisition frequency to acquire the strain value of the submarine cable for experiments.
4. The method of claim 2, wherein said determining a test scale based on said cable physical property parameter value and said plurality of parameter ranges comprises:
And determining the test scale based on the cable physical characteristic parameter value, the wave height parameter, the wave period parameter, the sea water depth parameter, the sea cable suspension height parameter and the sea cable suspension span parameter.
5. The method according to claim 2, wherein the cable physical characteristics of the submarine cable include outer diameter, mass per unit length, modulus of elasticity, mode of lay and depth of embedment; the obtaining the target physical characteristics of the submarine cable for experiments based on the test scale and the cable physical characteristic parameter value and obtaining the submarine cable for experiments based on the target physical characteristics comprises the following steps:
Acquiring target physical characteristics of the experimental submarine cable based on the elastic modulus and the test scale of the submarine cable, wherein the target physical characteristics comprise the outer diameter, the mass per unit length, the elastic modulus and the embedding depth of the experimental submarine cable;
And manufacturing the submarine cable for experiments based on the target physical characteristics.
6. The method of claim 5, wherein said making said experimental submarine cable comprises:
Selecting a polyvinyl chloride (PVC) pipe;
and filling lead particles into the PVC pipe to obtain the submarine cable for experiments.
7. The method of claim 2, wherein the obtaining a plurality of parameter ranges for the submarine cable strain experiment comprises:
Acquiring the variation ranges of a plurality of parameters for submarine cable strain experiments;
And obtaining the plurality of parameter ranges based on the variation range.
8. A method according to claim 3, wherein after attaching strain gauges at a plurality of locations of the experimental submarine cable, further comprising:
and waterproof sealing is carried out on the strain gauge by adopting a thermoplastic sealing film.
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