CN103235864B - A kind of low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis - Google Patents
A kind of low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis Download PDFInfo
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- CN103235864B CN103235864B CN201310173491.5A CN201310173491A CN103235864B CN 103235864 B CN103235864 B CN 103235864B CN 201310173491 A CN201310173491 A CN 201310173491A CN 103235864 B CN103235864 B CN 103235864B
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Abstract
The invention discloses a kind of low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis, described method comprises the steps: finite element model a) setting up low-voltage electrical apparatus accessory; B) internal stress size under vibratory impulse of low-voltage electrical apparatus accessory and distribution is analyzed; C) according to analysis result, the structure of low-voltage electrical apparatus accessory is optimized.The present invention provides a kind of low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis first, low-voltage electrical apparatus bracing frame can be obtained under the external impacts being subject to certain accekeration by the inventive method, the stress of its inside and distribution situation, thus be that low-voltage electrical apparatus accessory avoids actual effect to carry out structure optimization in vibratory impulse situation and design provides foundation; Application of the present invention is strong, can be used for, in the vibratory impulse failure analysis of low-voltage electrical apparatus components and parts, having important value to the performance monitoring of low-voltage electrical apparatus.
Description
Technical field
The present invention relates to a kind of vibratory impulse actual effect simulating analysis, specifically, relate to a kind of low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis.
Background technology
Low-voltage electrical apparatus a kind ofly according to the signal in the external world and requirement, can connect or disconnect circuit manually or automatically, to realize switching to circuit or non-electrical object, control, protection, detection, the element of conversion and adjustment and equipment.In recent years, along with raising that is electrified, automatization level, low-pressure electronic equipment product is widely used in fields such as industrial automation, household electrical appliance, automobile, communications.Simultaneously, various low-voltage electrical apparatus is also using in electric system and low-voltage distribution system, electric system and low-voltage distribution system is just caused to break down and cause power outage if these low-voltage electrical apparatuses break down, the even safety of entail dangers to supply line and consumer, the economic loss that it causes will be more huge.According to the requirement of standard GB/T 14048.5-2008 " low voltage switch equipment and opertaing device the 5th part: control circuit electrical equipment and on-off element ", the break-make performance of low-voltage electrical apparatus and life-span are not only the general performance of Design and machining of products technique, are also the important indicators weighing low-voltage electrical apparatus performance quality.Therefore, the reliability consideration tool carrying out various low-voltage electrical apparatus is of great significance.
Low-voltage electrical apparatus is because improper use, for a long time reasons such as component aging and the vibratory impulse being subject to surrounding environment that put into operation all there will be fault in operational process, and failure mode is various.Such as, when low-voltage electrical apparatus is subject to vibratory impulse, contact can be caused to come off and cause loose contact; Because operating frequency is too high, the vibration that contact is continued during the course and cause the Fast Wearing of contact; Because dynamic/static contact contact resistance is excessive or it is excessive to pass through electric current, causes contact overheated, when contact temperature exceedes permissible value, make contact characteristic deteriorate, even produce melting welding etc.
Due to the importance of low-voltage electrical apparatus in whole power industry and himself troublesome character, make to test test and carry out analysis and research to failure factor and seem and be even more important to low-voltage electrical apparatus.The test event of low-voltage electrical apparatus mainly comprises general inspection, voltage drop mensuration, temperature rise test experiments, insulation resistance and voltage-withstand test, the aptitude tests of specified connection Sum decomposition, short circuit making and breaking capacity test, KA Rms aptitude tests, acting characteristic test, life test, immunity to interference test etc.Foreign scholar mainly tends to the research to low-voltage electrical apparatus field failure diagnostic system, domesticly in the research of low-voltage electrical apparatus endurance testing device, make a few thing, simultaneously, domestic also have scholar to be studied in low-voltage electrical apparatus emulation technology, mainly comprises thermal process analysis, electromagnetic transient specificity analysis, mechanism action specificity analysis, switching arc analysis.But, in the analysis to low-voltage electrical apparatus function effect factor, also low-voltage electrical apparatus accessory vibratory impulse actual effect is not carried out to the research of simulation analysis.
Summary of the invention
Consider that the impact of vibratory impulse on low-voltage electrical apparatus and accessory thereof is very large, the object of the present invention is to provide a kind of low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis, by setting up the mathematical model of low-voltage electrical apparatus accessory, the relation between research vibratory impulse and low-voltage electrical apparatus accessory, thus grasp vibratory impulse to the impact of low-voltage electrical apparatus accessory performance, and then the performance of prediction low-voltage electrical apparatus accessory under the impact of external environment condition and therein vibratory impulse, in vibratory impulse situation, avoid actual effect to carry out structure optimization for low-voltage electrical apparatus accessory and design provides foundation.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis, comprises the steps:
A) finite element model of low-voltage electrical apparatus accessory is set up;
B) internal stress size under vibratory impulse of low-voltage electrical apparatus accessory and distribution is analyzed;
C) according to analysis result, the structure of low-voltage electrical apparatus accessory is optimized.
As a kind of preferred version, step a) comprises following operation steps:
1. create the 3-D geometric model of low-voltage electrical apparatus accessory and material properties and stress and strain model cell type are set;
2. stress and strain model is carried out to the 3-D geometric model created;
3. the model carrying out stress and strain model is imposed restriction.
As further preferred version, step 1. arranges SOLID45 or/and SHELL181 is as stress and strain model cell type.
As further preferred version, 2. step adopts freedom (free) grid division mode to carry out stress and strain model.
As further preferred version, 3. step applies the boundary condition constraint of 6 degree of freedom to the model carrying out stress and strain model.
Low-voltage electrical apparatus accessory described in the present invention comprises low-voltage electrical apparatus bracing frame and to be connected with external circuits with for low-voltage electrical apparatus and three electric insulating tubes insulated mutually with the external world.
As a kind of preferred version, the cross sectional shape of described low-voltage electrical apparatus bracing frame is L-type.
As a kind of preferred version, described electric insulating tube is formed by two hollow cylinders are orthogonal.
As further preferred version, described low-voltage electrical apparatus bracing frame adopts carbon steel Q265 to make.
As further preferred version, described electric insulating tube adopts epoxy resin to make.
Compared with prior art, the present invention has following beneficial effect:
The present invention provides a kind of low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis first, low-voltage electrical apparatus bracing frame can be obtained under the external impacts being subject to certain accekeration by the inventive method, the stress of its inside and distribution situation, thus be that low-voltage electrical apparatus accessory avoids actual effect to carry out structure optimization in vibratory impulse situation and design provides foundation; Application of the present invention is strong, can be used for, in the vibratory impulse failure analysis of low-voltage electrical apparatus components and parts, having important value to the performance monitoring of low-voltage electrical apparatus.
Accompanying drawing explanation
Fig. 1 is the structural representation of low-voltage electrical apparatus accessory of the present invention;
Fig. 2 is the internal stress distribution figure of low-voltage electrical apparatus accessory under vibratory impulse described in embodiment.
In figure: 1, low-voltage electrical apparatus bracing frame; 2, electric insulating tube; 3, stress distribution concentrates place.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is elaborated further:
As shown in Figure 1, low-voltage electrical apparatus accessory of the present invention comprises low-voltage electrical apparatus bracing frame 1 and to be connected with external circuits with for low-voltage electrical apparatus and three electric insulating tubes 2 insulated mutually with the external world; The cross sectional shape of described low-voltage electrical apparatus bracing frame 1 is L-type, adopts carbon steel Q265 to make; Described electric insulating tube 2 is formed by two hollow cylinders are orthogonal, adopts epoxy resin to make.
The present invention carries out the method for vibratory impulse actual effect simulation analysis to described low-voltage electrical apparatus accessory, comprises the steps:
A) set up the finite element model of low-voltage electrical apparatus accessory, comprise following operation steps:
1. create the 3-D geometric model of low-voltage electrical apparatus accessory and material properties and stress and strain model cell type are set;
2. stress and strain model is carried out to the 3-D geometric model created;
3. the model carrying out stress and strain model is imposed restriction;
B) internal stress size under vibratory impulse of low-voltage electrical apparatus accessory and distribution is analyzed;
C) according to analysis result, the structure of low-voltage electrical apparatus accessory is optimized.
As a kind of preferred version, step 1. arranges SOLID45 or/and SHELL181 is as stress and strain model cell type, 2. step adopts freedom (free) grid division mode to carry out stress and strain model, and 3. step applies the boundary condition constraint of 6 degree of freedom to the model carrying out stress and strain model.
Simulating analysis of the present invention can adopt Ansys software simulating; Described Ansys software is that merge structure, fluid, electric field, magnetic field, Analysis of The Acoustic Fields are in the large-scale general finite element analysis software of one, developed by the U.S. ANSYS of one of finite element analysis software company maximum in the world, it can with most CAD software interface, realize sharing and exchanging, as Pro/Engineer, NASTRAN of data, Alogor, I-DEAS, Auto CAD etc. are one of senior CAE instruments in new detection technology.
Embodiment
Ansys software is adopted to carry out vibratory impulse actual effect simulation analysis to low-voltage electrical apparatus accessory of the present invention:
Step one: the finite element model setting up low-voltage electrical apparatus accessory
1, create the 3-D geometric model of low-voltage electrical apparatus accessory, and material properties and stress and strain model cell type are set
The present invention, when setting up the 3-D geometric model of low-voltage electrical apparatus accessory, have ignored the adhesive surface between electric insulating tube and L-type base for supporting and relative motion.
The Q265 material parameter wherein adopted is: density p=7.84 × 10
3kg/cm
3, Young modulus E=2 × 10
11pa, Poisson ratio μ=0.3; The epoxide resin material parameter adopted is: density p=1.7 × 10
3kg/cm
3, Young modulus E=10.2 × 10
3pa, Poisson ratio μ=0.42.
Mesolow electrical accessorie model meshes division unit type of the present invention adopts SOLID45, and the stress and strain model cell type of electric insulating tube adopts SHELL181.
2, stress and strain model is carried out to the 3-D geometric model created
Stress and strain model mode has free and map two kinds usually, different modes is selected to produce conclusive impact by the result solved and computational accuracy, because the planform of mesolow electrical accessorie of the present invention is uncomplicated, the present invention adopts freedom (free) grid division mode to carry out stress and strain model, and first face division is carried out to electric insulating tube, then body division is carried out to L-type bracing frame.
3, the model carrying out stress and strain model is imposed restriction
The present invention is respectively to the boundary condition constraint of upper applying 6 degree of freedom in whole of the bottom of L-type bracing frame.
Step 2: analyze internal stress size under vibratory impulse of low-voltage electrical apparatus accessory and distribution
First continuous print impulsive force load is carried out to the entirety of low-voltage electrical apparatus accessory, then check the stress intensity that low-voltage electrical apparatus accessory inside produces and distribution situation by aftertreatment, observe it and whether exceeded the stress limit of respective material.
Fig. 2 is the described internal stress distribution figure of low-voltage electrical apparatus accessory under vibratory impulse, as seen from Figure 2: be positioned at traversing of two cylindrical support frame places of base and electric insulating tube and all there is stress distribution with vertical tube intersection location place and concentrate place 3.
Step 3: according to analysis result, is optimized the structure of low-voltage electrical apparatus accessory
Analysis result according to step 2 can be learnt: the stress value having two places to produce is larger, stress value distribution near two the cylindrical support framves being wherein positioned at L-type support frame base part is comparatively concentrated and its stress value is larger, maximal value has exceeded the stress permissible value limit of this carbon steel material Q265, illustrates that this easily sex change occurs under being in vibratory impulse condition; In addition, electric insulating tube traverse with vertical tube in crossing position, stress distribution is also comparatively concentrated, and stress value is also comparatively large, has exceeded the stress limit 90MPa of epoxy resin, has illustrated that this also easily crack conditions occurs under being in vibratory impulse condition.
Had above-mentioned analysis result, those skilled in the art has just had design considerations low-voltage electrical apparatus accessory being carried out to structure optimization.
What be finally necessary to herein means out is; above-mentioned explanation is only for being described in further detail technical scheme of the present invention; can not be interpreted as limiting the scope of the invention, some nonessential improvement that those skilled in the art's foregoing according to the present invention is made and adjustment all belong to protection scope of the present invention.
Claims (8)
1. a low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis, comprises the steps:
A) finite element model of low-voltage electrical apparatus accessory is set up;
B) internal stress size under vibratory impulse of low-voltage electrical apparatus accessory and distribution is analyzed;
C) according to analysis result, the structure of low-voltage electrical apparatus accessory is optimized;
It is characterized in that: described low-voltage electrical apparatus accessory comprises low-voltage electrical apparatus bracing frame and to be connected with external circuits with for low-voltage electrical apparatus and three electric insulating tubes insulated mutually with the external world, described electric insulating tube is formed by two hollow cylinders are orthogonal.
2. low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis as claimed in claim 1, it is characterized in that, step a) comprises following operation steps:
1. create the 3-D geometric model of low-voltage electrical apparatus accessory and material properties and stress and strain model cell type are set;
2. stress and strain model is carried out to the 3-D geometric model created;
3. the model carrying out stress and strain model is imposed restriction.
3. low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis as claimed in claim 2, is characterized in that: step 1. arranges SOLID45 or/and SHELL181 is as stress and strain model cell type.
4. low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis as claimed in claim 2, is characterized in that: 2. step adopts free grid division mode to carry out stress and strain model.
5. low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis as claimed in claim 2, is characterized in that: 3. step applies the boundary condition constraint of 6 degree of freedom to the model carrying out stress and strain model.
6. low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis as claimed in claim 1, is characterized in that: the cross sectional shape of described low-voltage electrical apparatus bracing frame is L-type.
7. the low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis as described in claim 1 or 6, is characterized in that: described low-voltage electrical apparatus bracing frame adopts carbon steel Q265 to make.
8. low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis as claimed in claim 1, is characterized in that: described electric insulating tube adopts epoxy resin to make.
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| CN201310173491.5A CN103235864B (en) | 2013-05-13 | 2013-05-13 | A kind of low-voltage electrical apparatus accessory vibratory impulse actual effect simulating analysis |
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| CN103235864B true CN103235864B (en) | 2015-08-19 |
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| CN103678805A (en) * | 2013-12-11 | 2014-03-26 | 上海工程技术大学 | Actual effect simulated analysis method of low-voltage switch accessory vibration shock |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834440A (en) * | 2009-03-09 | 2010-09-15 | 上海市电力公司 | Research method of novel high-efficient power supply equipment for special needs for low-voltage distribution system |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834440A (en) * | 2009-03-09 | 2010-09-15 | 上海市电力公司 | Research method of novel high-efficient power supply equipment for special needs for low-voltage distribution system |
Non-Patent Citations (1)
| Title |
|---|
| 管瑞良,王云峰,顾建青,刘洪武.计算机仿真在断路器操作机构设计中的应用.《低压电器》.2009,(第3期),第7-9页. * |
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Granted publication date: 20150819 |