CN104330272B - Jib structure fatigue strength monitoring method, equipment, system and fire fighting truck - Google Patents
Jib structure fatigue strength monitoring method, equipment, system and fire fighting truck Download PDFInfo
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- CN104330272B CN104330272B CN201410570521.0A CN201410570521A CN104330272B CN 104330272 B CN104330272 B CN 104330272B CN 201410570521 A CN201410570521 A CN 201410570521A CN 104330272 B CN104330272 B CN 104330272B
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Abstract
The invention discloses a kind of jib structure fatigue strength monitoring method, equipment, system and fire fighting truck, wherein the monitoring method includes：Stress value when receiving working condition at least one test point of the jib structure；For each test point, its accumulative tired nominal stress frequency is calculated according to its stress value；And according to the accumulative tired nominal stress frequency and the predetermined maintenance frequency and/or make a reservation for scrap the frequency to determine the maintenance of the arm support and/or scrap.Erroneous judgement to arm support fatigue strength can be avoided by the method, arm support is overhauled and/or is scrapped in time, improve the service efficiency of arm support and the security of work.
Description
Technical field
The present invention relates to engineering machinery field, in particular it relates to a kind of jib structure fatigue strength monitoring method, equipment,
System and fire fighting truck.
Background technology
Some engineering machinery, such as fire fighting truck, are typically provided the arm support of extension type aerial ladder ladder or foldable expansion, can
Ascend a height to be put out a fire and succoured trapped personnel for fire fighter, the fire fighting truck with arm support be realize skyscraper fire extinguishing with
And the primary armament of rescue.Jib structure occurs fatigue failure when alternate load effect is being born, and badly influences arm
The service behaviour of frame structure, or even threaten its security.And the ladder (arm support) of fire fighting truck is used as a kind of special engineering structure,
Put out a fire or during rescue work working strength greatly, and fire fighting truck usually also need to for carry out daily workout and
Combat exercise, this cause ladder (arm support) often to bear it is random, repeatedly, the load of high intensity, thus result in ladder (arm
Frame) there is the probability increase of fatigue failure in jib structure, particularly its key position (structure location of maximum stress), and once disappear
There is the fatigue failure of structure or key position in anti-car ladder (arm support) structure, will result in the reduction of fire fighting truck service behaviour
Even lose, this safety and reliability that serious threat fire fighting truck works.
Therefore, the fatigue strength monitoring that structure Life cycle is carried out to ladder (arm support) just turns into control ladder (arm support)
Fatigue failure, the key for ensureing its normal working performance and security reliability.But, currently almost not specifically designed for ladder
The fatigue strength monitoring technology and method of (arm support) Life cycle, the judgement of its fatigue failure generally rely on use time and come true
It is fixed.
In fire fighting truck ladder (arm support) the fatigue failure determination methods based on time history, when fire fighting truck vehicle has been produced
Cheng Hou, the life cycle of fire fighting truck starts, and it is T that fire fighting truck is delivered to the time that fire brigade uses0；When fire fighting truck is delivered for use
Time reaches TX1During the time, the 1st maintenance need to be carried out, as arrival TX2During the time, the 2nd maintenance ... need to be carried out and reach TXNWhen
Between when, complete in its life cycle (n-th) last time and overhaul, until to TBTime fire fighting truck is scrapped.
Wherein, the time T that fire fighting truck is delivered for use0It is change, and repair time TX1、TX2……TXNGenerally by
Determine with reference to correlation theory and experience, such as by engineering structure fatigue strength theory and fire fighting truck be actually used, service experience
To set each repair time, and and T0It is relevant；And the time T that fire fighting truck is scrappedBAlso typically come by relevant criterion or experience
It is determined that.
Because of situations such as frequency of use of the fire fighting truck under different regions, time and environment, intensity are different, make
May occur fatigue failure within the relatively short time than larger ladder (arm support) with frequency and intensity, and use
The smaller ladder of frequency and intensity (arm support) are within the relatively long time it is also possible to being not in fatigue failure.Therefore,
If using use time length as fatigue failure judgment basis, it is most likely that erroneous judgement can be caused.In addition, existing method does not have
For fire fighting truck ladder (arm support) structural stress and the intelligent early-warning mechanism of fatigue strength so that user must be to fire fighting truck
Situations such as frequency of use, duration, carries out manual record, the maintenance of fire fighting truck or scraps also artificial judgement, this just greatly increase
Fire fighting truck use and maintenance triviality, and indirectly increased its security risk for using.
The content of the invention
It is an object of the invention to provide a kind of jib structure fatigue strength monitoring method, equipment, system and fire fighting truck, the prison
Survey method can relatively accurately trouble hunt ing and failure time, drastically increase the service efficiency of arm support and the safety of work
Property.
To achieve these goals, the present invention provides a kind of jib structure fatigue strength monitoring method, the monitoring method
Including：Stress value when receiving working condition at least one test point of the jib structure；For each test point, root
Its accumulative tired nominal stress frequency is calculated according to its stress value；And according to the accumulative tired nominal stress frequency and pre- regular inspection
Frequency repair is secondary and/or makes a reservation for scrap the frequency to determine the maintenance of the arm support and/or scrap.
Correspondingly, the present invention also provides a kind of jib structure fatigue strength monitoring device, and the monitoring device includes：Receive
Device, stress value when receiving working condition at least one test point of the jib structure；And decision making device, it is used for：
For each test point, its accumulative tired nominal stress frequency is calculated according to its stress value；And according to the accumulative tired name
The adopted stress frequency and the predetermined maintenance frequency and/or predetermined scrap the frequency to determine the maintenance of the arm support and/or scrap.
Correspondingly, the present invention also provides a kind of jib structure fatigue strength monitoring system, and the monitoring system includes：It is above-mentioned
Jib structure fatigue strength monitoring device；Detection means, is connected with the reception device, the test point for detecting the arm support
The stress value at place.
Correspondingly, the present invention also provides a kind of fire fighting truck, and the fire fighting truck includes above-mentioned arm support structural fatigue intensity monitoring
System.
By above-mentioned technical proposal, the accumulative tired nominal stress frequency and the predetermined maintenance frequency according to arm support test point
And/or make a reservation for scrap the frequency to determine the maintenance of the arm support and/or scrap, can so avoid the mistake to arm support fatigue strength
Sentence, arm support is overhauled and/or is scrapped in time, improve the service efficiency of arm support and the security of work.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute the part of specification, with following tool
Body implementation method is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
The structured flowchart of the jib structure fatigue strength monitoring system that Fig. 1 is provided for the present invention；
Fig. 2 is detection means in the hook and ladder jib structure fatigue monitoring system with the 3 a certain models for saving ladders
Installation Example schematic diagram；
Fig. 3 (a)-(f) gives the schematic diagram of the display picture of display device；And
Fig. 4 is the flow chart according to jib structure fatigue strength monitoring method of the invention.
Description of reference numerals
The monitoring device of 10 detection means 20
The decision making device of 210 reception device 220
Specific embodiment
Specific embodiment of the invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Fig. 1 is the structured flowchart of the jib structure fatigue strength monitoring system that the present invention is provided.As shown in figure 1, of the invention
The jib structure fatigue strength monitoring system of offer can include：Detection means 10, for answering at the test point for detecting arm support
Force value；And jib structure fatigue strength monitoring device 20, the monitoring device 20 can include：Reception device 210 and decision-making are filled
220 are put, reception device 210 is used to receive the stress value at least one test point of jib structure during working condition；Certainly
Plan device 220 is used for：For each test point, its accumulative tired nominal stress frequency is calculated according to its stress value；And according to
The accumulative tired nominal stress frequency and the predetermined maintenance frequency and/or predetermined scrap the frequency to determine the maintenance of the arm support
And/or scrap.Wherein, detection means 10 is connected with reception device 210.The accumulative tired nominal stress frequency for being calculated can be compared with
Accurately to reflect the intensity of arm support, therefore the inspection of arm support can be relatively accurately determined based on the accumulative tired nominal stress frequency
Repair and/or scrap.
Detection means 10 is mainly to the stress at the key position on jib structure fatigue strength on fire fighting truck arm support
Real-time detection is carried out, while real-time stress mornitoring value is converted into data signal, to output this to reception device 210.From knot
From the point of view of structure fatigue theory, structural fatigue failure typically occurs in structure location of maximum stress.For example in aerial ladder jib structure, under
Chord member is its bearing structure main, and the fatigue failure of ladder bed structure is typically appeared on lower boom at first, and this is also inspection
Survey the basic principle that the installation site of device 10 is chosen.For motor ladder jib structure, under various work operating modes, arm support knot
Typically there is first segment ladder lower boom in structure stress maximum position, on location A as shown in Figure 2.
Fig. 2 is detection means in the hook and ladder jib structure fatigue monitoring system with the 3 a certain models for saving ladders
Installation Example schematic diagram.As shown in Fig. 2 detection means 10, such as structural stress sensor, may be mounted at first segment arm support
On the location A of side lower boom, structural stress sensor can take pre-buried mode to install, i.e., before ladder bed structure assembling,
Just structural stress sensor is placed on the relevant position of chord member in advance, and embedment in advance or later stage install corresponding signal and pass
Defeated line (if signal behavior wireless way for transmitting, installing corresponding sender unit)；Meanwhile, in this example, receive dress
Put 210 and may be mounted at first segment arm support at the position of operating desk.
Certainly, it is the precision and accuracy that improve measurement, the quantity of measuring point, position and specific mounting means can be with
It is adjusted depending on actual conditions, is not repeated one by one herein.Its installation process described in detail below.
First by theoretical analysis and calculation, working condition and load stressing conditions to fire fighting truck arm support are analyzed, and
The various operating modes of arm support are for example simulated by finite element software, to find the pass on jib structure fatigue strength on arm support
Key position, such as key position can be that the stress maximum position of jib structure (or for multiple strain gauges, is found
Multiple larger positions of stress), so that it is determined that specific installation number and position per joint arm frame strain gauge；Then further according to arm
The concrete structure of frame and the actual conditions of installation site, carry out reasonable selection strain gauge and holding wire (or signal transmitting dress
Put) mounting means, it is and true according to actual conditions to determine prepackage or the installation after the completion of assembling before ladder assembling
Determine the riding position of signal receiving device.Certainly, before actual use, it should by corresponding debugging and experiment.
Reception device 210 in monitoring device 20 receives the jib structure key position being transmitted to by detection means 10
Real-time stress signal, tired nominal stress is carried out to the real-time stress signal of each key position of structure by decision making device 220
Calculating, and obtain the accumulative tired nominal stress frequency of position；When arm support position structural fatigue nominal stress frequently
Secondary when reaching predetermined value, decision making device 220 will send and overhaul accordingly, scraps or alarm command.Below will be by specific
Implementation method describes said process in detail.
In this embodiment, monitoring device may be mounted in the operating system of hook and ladder arm support, with convenient
The input and output of required corresponding signal.
The arm support that the receiving detection device 10 (such as structural stress sensor) of reception device 210 is detected in working order under
The real-time stress value of corresponding position；Answering when decision making device 220 calculates the adjacent double sampling for receiving according to below equation
Force value FmAnd Fm+1Between stress fluctuation amplitude δm：
δm=| Fm+1-Fm|
Then, tired nominal stress frequency n when decision making device 220 is according to below equation the m times sampling of calculatingm：
Finally, decision making device 220 calculates the described accumulative tired nominal stress frequency N of the test point according to below equationm：
Wherein, m=1,2 ..., T, T are integer, δ0It is fluctuation amplitude that the fatigue stress of the test point is allowed, and δ0＞ 0,
δ0Can be preset according to actual conditions.
It is, of course, also possible to the tired nominal stress frequency each time is input into counter, by counter to corresponding
The tired nominal stress frequency at position carries out cumulative calculation.
Sampling stress value Fm, accumulative fatigue nominal stress frequency NmCan be with incoming and real-time update storage to memory.
Decision making device 220 can in real time read the Various types of data in memory, and according to corresponding structural fatigue intensity judgment principle or
Person's structural stress situation, sends to monitoring and warning system and overhauls accordingly, scraps or alarm command.Hereinafter will be described in detail one
Plant structural fatigue intensity judgment principle.
The judgment principle be based on the accumulative fatigue nominal stress frequency and the predetermined maintenance frequency and/or it is predetermined scrap the frequency come
Determine the maintenance of the arm support and/or scrap.Wherein, making a reservation for the maintenance frequency includes the early warning maintenance frequency and forces maintenance frequency
It is secondary, and predetermined scrap the frequency and scrap frequency N including early warningbf-yjFrequency N is scrapped with pressurebf-qz, wherein, the decision making device is also
For any test point at least one test point perform it is following at least one：
As the accumulative tired nominal stress frequency NmEqual to the early warning maintenance frequency N of pth time maintenancep-yjWhen, it is pre- to monitoring
Alert system sends the alarm command that pth time maintenance is carried out to the arm support,
As the NmMore than or equal to the Np-yjAnd less than the pressure maintenance frequency N of pth time maintenancep-qzWhen, to the monitoring
Early warning system continuously transmits the alarm command that pth time maintenance is carried out to the arm support, and sends arm support load no more than pth time
The instruction of the default load of maintenance,
As the NmEqual to the Np-qzWhen, being sent to the monitoring and warning system carries out pth time maintenance to the arm support
Imperative instruction, and the instruction for forbidding arm support to work is sent,
As the NmEqual to the Nbf-yjWhen, the early warning scrapped to the arm support is sent to the monitoring and warning system
Instruction, and the instruction of the default load that arm support load is no more than scrapped is sent,
As the NmMore than or equal to the Nbf-yjAnd less than the Nbf-qzWhen, it is right to be continuously transmitted to the monitoring and warning system
The alarm command that the arm support is scrapped, and the instruction of the default load that arm support load is no more than scrapped is sent,
As the NmEqual to the Nbf-qzWhen, the pressure scrapped to the arm support is sent to the monitoring and warning system
Instruction, and send the instruction for forbidding the arm support work.
Wherein, the default load of maintenance and the default load scrapped can be with identical every time, it is also possible to entered according to actual conditions
Row is default.Arm support maintenance total degree, the early warning value of the tired nominal stress frequency of point position structural inspection and force values, and
Scrap the early warning value and force values of the frequency, can according to the concrete structure of arm support, material mechanical performance, structural fatigue it is theoretical and
Practical Project practical experience is obtained.This is well known to the skilled artisan, therefore repeats no more.
Monitoring system can also include warning monitoring system, and the warning monitoring system can include display device, for showing
Show the stress value of the arm support, life cycle, maintenance early warning, force maintenance, scrap the monitoring information that early warning and pressure are scrapped；Control
Device processed, the work of the arm support is controlled according to the monitoring information；And after-sale service system, for obtaining the monitoring letter
Breath is managed after sale with to the arm support.
Wherein, display system can read arm support each position from monitoring device 20 in real time (such as in the memory of monitoring system)
The structure instantaneous stress value at place, with arm support spread length, angle of revolution, the angle of pitch read from fire fighting truck operation management system
The data such as degree and service load are displayed in system display panel together.
Fig. 3 (a)-(f) gives the schematic diagram of the display picture of display device, and display device is carried including ladder life cycle
Show module (panel left side), arm support work service data display module (panel lower right side) and arm support working condition display module
(panel upper right side).Wherein, arm support working condition display module can in real time show flexible and the pitching situation, arm support work of arm support
Making service data display module can in real time show collapsing length, luffing angle, angle of revolution, the work of measuring point stress and arm support
Make the parameters such as load, dependent instruction and data that arm support life cycle reminding module can be transmitted according to detection means, with progress bar
Form carry out arm support life cycle, maintenance early warning, force maintenance, scrap early warning and pressure such as scraps at the prompting.Meanwhile, it is
Related data and command information in system, all can in real time be sent to the after-sale service of fire fighting truck manufacturer by after-sale service system
In the data receiving system of department, after-sale service, maintainer can obtain in time the structural stress situation of fire fighting truck arm support with
And working condition.
When the decision making device 220 that monitoring and warning system receives monitoring device 20 sends corresponding maintenance early warning, pressure inspection
Repair, scrap early warning or when pressure such as scraps at the instruction, control device can control the display device to carry out corresponding display reminding (such as
Shown in Fig. 3), and control fire fighting truck arm support operating system is limited arm support action accordingly simultaneously.
After display device receives the frequency information that monitoring device transmission comes, the progress of arm support life cycle reminding module
Bar will rise (shown in such as Fig. 3 (a)-(f)) with the increase of the frequency.
When frequency value overhauls early warning respective value (can be represented with yellow line in display interface) below in pth time, enter
Degree bar and corresponding pth time maintenance indicator lamp can be shown as green light (shown in such as Fig. 3 (a) or (d)).
When frequency value is up to or over pth time maintenance early warning respective value or scraps early warning respective value (in display interface
Can be represented with yellow line) when, i.e., when display device receives the next maintenance alarm command of monitoring device transmission or scraps early warning
During instruction, progress bar and corresponding pth time maintenance indicator lamp or scrap warning light and can be shown as amber light (such as Fig. 3 (b) or (e)
It is shown)；Meanwhile, control device can limit the relevant work ability of arm support to ensure the safe operation of fire fighting truck, while may be used also
Maintenance cue is sent with to after-sale service system, points out producer's after-sale service, maintainer to go in time where fire fighting truck
Ground coordinates carries out the maintenance and maintenance of arm support, or for the scrapping of ladder, the dependencies such as change service be provided.
When frequency value reaches pth time pressure maintenance respective value (can be represented with red line in display interface) or scraps pre-
During alert respective value, i.e., when display device receives the next pressure maintenance instruction of monitoring device transmission or instruction is scrapped in pressure, enter
Degree bar and corresponding pth time are overhauled indicator lamp or scrap warning light can be shown as red light (shown in such as Fig. 3 (c) or (f))；Together
When, control device can be forced to forbid arm support to be operated, accordingly overhauled due to odjective cause arm support with preventing or
Change and security incident operationally occurs.
In addition, being shown as green when the parameter value shown in arm support work service data display module is in the range of safety value
Color, is shown as yellow when between early warning value and dangerous values, reach shown in red during dangerous values.
In addition, when being overhauled when monitoring and warning system receives ladder maintenance early warning, pressure, scrap early warning, forcing to scrap,
Display information, cue or corresponding control instruction appeared in display device, are only carrying out corresponding maintenance, are scrapping
Could be eliminated after changing Deng treatment or arm support working condition, will otherwise existed always effectively, to ensure fire fighting truck operation and work
The security of work.If arm support completes maintenance in the Warning years of pth time maintenance, maintainer can adjust system program, neglect it
The pressure maintenance of slightly pth time judges, but does not interfere with corresponding maintenance thereafter and the judgement scrapped；Meanwhile, when arm support is carried out
After pth time maintenance, into pth+1 monitoring of time between overhauls(TBO), it is not up to+1 maintenance early warning value of pth in the frequency or scraps pre-
During alert value, progress bar can be with shown in green.
Correspondingly, the present invention also provides a kind of fire fighting truck, and the fire fighting truck includes above-mentioned arm support structural fatigue intensity monitoring
System.
Correspondingly, the present invention also provides a kind of jib structure fatigue strength monitoring method.Fig. 4 is according to arm support of the invention
The flow chart of structural fatigue intensity monitoring method.As shown in figure 4, the monitoring method can include：At step 401, receive
Stress value during working condition at least one test point of the jib structure；At step 402, for each detection
Point, its accumulative tired nominal stress frequency is calculated according to its stress value；And at step 403, according to the accumulative tired name
The adopted stress frequency and the predetermined maintenance frequency and/or predetermined scrap the frequency to determine the maintenance of the arm support and/or scrap.It is relevant to be somebody's turn to do
The detail and benefit of method are identical with above-mentioned details and benefit for monitoring system, are repeated no more in this.
By the present invention provide technical scheme, with the actual stress situation of jib structure, structural fatigue nominal stress and
The foundation that its frequency judges as structural fatigue intensity detection, can eliminate subjectivity and root that existing method rule of thumb judges
According to the uncertainty that use time judges, the service efficiency and job security of arm support are drastically increased；Simultaneously also to arm support
Real-time stress situation, overhaul and scrap demand and continue big overstressing situation and comprehensively monitored, pointed out and controlled,
The service behaviour of jib structure can be to greatest extent realized on the premise of security is ensured；Furthermore it is also possible to realize producer
The monitoring of (after-sale service, maintenance department) to fire fighting truck jib structure Life cycle of dispatching from the factory, can in time obtain fire fighting truck arm
Operation working condition in the frame working time；When structure Awaiting Overhaul signal is received, structural fatigue can be known with the very first time
Intensity danger position, is prepared with determining maintenance solution in time, completing maintenance, dramatically saves on the repair time；Meanwhile, obtained
Data, or improve fire fighting truck arm support structural fatigue Intensity Design provide reference and foundation.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in range of the technology design of the invention, various letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy is no longer separately illustrated.
Additionally, can also be combined between a variety of implementation methods of the invention, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (8)
1. a kind of jib structure fatigue strength monitoring method, it is characterised in that the monitoring method includes：
Stress value when receiving working condition at least one test point of the jib structure；
For each test point, its accumulative tired nominal stress frequency is calculated according to its stress value；And
According to the accumulative tired nominal stress frequency and the predetermined maintenance frequency and/or predetermined scrap the frequency to determine the arm support
Maintenance and/or scrap；
Wherein, adding up its tired nominal stress frequency for each test point includes：
Stress value F during the adjacent double sampling for receiving is calculated according to below equationmAnd Fm+1Between stress fluctuation amplitude δm：
δm=| Fm+1-Fm|；
Tired nominal stress frequency n during the m times sampling is calculated according to below equationm：And
The described accumulative tired nominal stress frequency N of the test point is calculated according to below equationm：
Wherein, m=1,2 ..., T, T are integer, δ0It is fluctuation amplitude that the fatigue stress of the test point is allowed, and δ0＞ 0.
2. monitoring method according to claim 1, it is characterised in that the test point is located on the arm support on arm support
The key position of structural fatigue intensity.
3. monitoring method according to claim 1, it is characterised in that the predetermined maintenance frequency includes that the frequency is overhauled in early warning
With force the maintenance frequency, and described predetermined scrap the frequency and scrap frequency N including early warningbf-yjFrequency N is scrapped with pressurebf-qz, its
In, for any test point at least one test point, perform it is following at least one：
As the accumulative tired nominal stress frequency NmEqual to the early warning maintenance frequency N of pth time maintenancep-yjWhen, to monitoring and warning system
System sends the alarm command that pth time maintenance is carried out to the arm support；
As the NmMore than the Np-yjAnd less than the pressure maintenance frequency N of pth time maintenancep-qzWhen, to the monitoring and warning system
The alarm command that pth time maintenance is carried out to the arm support is continuously transmitted, and it is pre- no more than pth time maintenance to send arm support load
If the instruction of load；
As the NmEqual to the Np-qzWhen, being sent to the monitoring and warning system carries out the pressure of pth time maintenance to the arm support
Instruction, and send the instruction for forbidding arm support to work；
As the NmEqual to the Nbf-yjWhen, sent to the monitoring and warning system and the early warning that the arm support is scrapped is referred to
Order, and send the instruction of the default load that arm support load is no more than scrapped；
As the NmMore than the Nbf-yjAnd less than the Nbf-qzWhen, continuously transmitted to the arm support to the monitoring and warning system
The alarm command scrapped, and send the default load command that arm support load is no more than scrapped；And
As the NmEqual to the Nbf-qzWhen, sent to the monitoring and warning system and the pressure that the arm support is scrapped is referred to
Order, and send the instruction for forbidding the arm support work.
4. a kind of jib structure fatigue strength monitoring device, it is characterised in that the monitoring device includes：
Reception device, stress value when receiving working condition at least one test point of the jib structure；And
Decision making device, is used for：
For each test point, its accumulative tired nominal stress frequency is calculated according to its stress value；And
According to the accumulative tired nominal stress frequency and the predetermined maintenance frequency and/or predetermined scrap the frequency to determine the arm support
Maintenance and/or scrap；
Wherein, the decision making device adds up its tired nominal stress frequency for each test point includes：
Stress value F during the adjacent double sampling for receiving is calculated according to below equationmAnd Fm+1Between stress fluctuation amplitude δm：
δm=| Fm+1-Fm|；
Tired nominal stress frequency n during the m times sampling is calculated according to below equationm：And
The described accumulative tired nominal stress frequency N of the test point is calculated according to below equationm：
Wherein, m=1,2 ..., T, T are integer, δ0It is fluctuation amplitude that the fatigue stress of the test point is allowed, and δ0＞ 0.
5. monitoring device according to claim 4, it is characterised in that the predetermined maintenance frequency includes that the frequency is overhauled in early warning
With force the maintenance frequency, and predetermined scrap the frequency and scrap frequency N including early warningbf-yjFrequency N is scrapped with pressurebf-qz, wherein, institute
State decision making device also directed to any test point at least one test point perform it is following at least one：
As the accumulative tired nominal stress frequency NmEqual to the early warning maintenance frequency N of pth time maintenancep-yjWhen, to monitoring and warning system
System sends the alarm command that pth time maintenance is carried out to the arm support,
As the NmMore than or equal to the Np-yjAnd less than the pressure maintenance frequency N of pth time maintenancep-qzWhen, to the monitoring and warning
System continuously transmits the alarm command that pth time maintenance is carried out to the arm support, and sends arm support load no more than pth time maintenance
Default load instruction,
As the NmEqual to the Np-qzWhen, being sent to the monitoring and warning system carries out the pressure of pth time maintenance to the arm support
Instruction, and the instruction for forbidding arm support to work is sent,
As the NmEqual to the Nbf-yjWhen, sent to the monitoring and warning system and the early warning that the arm support is scrapped is referred to
Order, and the instruction of the default load that arm support load is no more than scrapped is sent,
As the NmMore than or equal to the Nbf-yjAnd less than the Nbf-qzWhen, continuously transmitted to described to the monitoring and warning system
The alarm command that arm support is scrapped, and the instruction of the default load that arm support load is no more than scrapped is sent,
As the NmEqual to the Nbf-qzWhen, sent to the monitoring and warning system and the pressure that the arm support is scrapped is referred to
Order, and send the instruction for forbidding the arm support work.
6. a kind of jib structure fatigue strength monitoring system, it is characterised in that the monitoring system includes：
Jib structure fatigue strength monitoring device described in any one of claim 4 or 5 claim；
Detection means, is connected with the reception device, for the stress value at the test point for detecting the arm support.
7. monitoring system according to claim 6, it is characterised in that the monitoring system also includes monitoring and warning system,
The monitoring and warning system includes：
Display device, for showing the stress value of the arm support, life cycle, maintenance early warning, forcing maintenance, scrap early warning and strong
The monitoring information that system is scrapped；
Control device, the work of the arm support is controlled according to the monitoring information；And
After-sale service system, is managed after sale for obtaining the monitoring information with to the arm support.
8. a kind of fire fighting truck, it is characterised in that the fire fighting truck includes that the jib structure fatigue strength of claim 6 or 7 is monitored
System.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410570521.0A CN104330272B (en) | 2014-10-23 | 2014-10-23 | Jib structure fatigue strength monitoring method, equipment, system and fire fighting truck |
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| CN201410570521.0A CN104330272B (en) | 2014-10-23 | 2014-10-23 | Jib structure fatigue strength monitoring method, equipment, system and fire fighting truck |
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| CN104330272B true CN104330272B (en) | 2017-06-30 |
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Address after: 410200 No. 997, Section 2, Tengfei Road, Wangcheng District, Changsha City, Hunan Province Patentee after: Hunan Zoomlion emergency equipment Co.,Ltd. Patentee after: ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY Co.,Ltd. Address before: No.997 Jinxing Road, Wangcheng District, Changsha City, Hunan Province Patentee before: Changsha Zhonglian Fire-Fighting Machinery Co.,Ltd. Patentee before: ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY Co.,Ltd. |