CN107543676A - A kind of shock loading generating means - Google Patents
A kind of shock loading generating means Download PDFInfo
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- CN107543676A CN107543676A CN201710822467.8A CN201710822467A CN107543676A CN 107543676 A CN107543676 A CN 107543676A CN 201710822467 A CN201710822467 A CN 201710822467A CN 107543676 A CN107543676 A CN 107543676A
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Abstract
Present invention relates particularly to a kind of high magnitude Strong Impact Loading generating means, belong to that airborne electronic equipment is anti-to ruin protection test technical field.And the testing equipment currently used for examination protection logger resisting strong impact ability only reaches to 5100g/5ms half-sine wave impact energys, constrain the anti-of product and ruin technology development.The shock loading generating means of the present invention, using hexagon aluminum alloy honeycomb structure material, the cell element wall thickness δ of the honeycomb is 0.15~0.25mm, and cell element angle, θ is 30 °, and cell element length of side l is 1~2mm；The shock loading generating means includes load along impact direction and rises control section, load peaks and decline control section and canned paragraph.The load not less than 6000g/5ms half-sine wave impact energys can be realized, it is easy to accomplish the trapezoidal wave in standard requirement.
Description
Technical field
Present invention relates particularly to a kind of high magnitude Strong Impact Loading generating means, belong to airborne electronic equipment it is anti-ruin it is anti-
Protect experimental technique field.
Background technology
High impact shock test is a Key experiments for examining aircraft protection logger resisting strong impact safeguard function.Protection note
Device is recorded when carrying out high impact shock test, with certain speed impacts load generating means, the specific thing of device is relied in knockout process
Reason characteristic realizes Strong Impact Loading index.With the continuous improvement of aeroplane performance, the resisting strong impact load indicators used of logger is protected
It is required that having brought up to, not less than 6000g/5ms half-sine waves impact energy, (that is, flight recorder can bear peak accelerator not
Less than 6000g, action time is not less than 5ms, and impact velocity variable quantity is not less than 187.2m/s half-sine wave impact energy).
And the testing equipment currently used for examination protection logger resisting strong impact ability only reaches to 5100g/5ms half-sine wave impact energys
Amount, constrain the anti-of product and ruin technology development.Its key factor restricted is exactly in thump equipment, is not less than for producing
A kind of load generating means of 6000g/5ms half-sine wave impact energys.
The content of the invention
The technical problems to be solved by the invention are：By the way that the kinetic energy of rammer is converted into load generating means
Can, " G " overload function that rammer is born is formed, realizes the thump not less than 6000g/5ms half-sine wave impact energys.
The shock loading generating means of the present invention, for carrying out shock-testing to product, the shock loading generating means is adopted
With hexagon aluminum alloy honeycomb structure material, the axis in honeycomb cell element hole is consistent with impact direction, the cell element wall of the honeycomb
Thick δ is 0.15~0.25mm, and cell element angle, θ is 30 °, and cell element length of side l is 1~2mm；Shock loading generating means edge impact side
To rising control section, load peaks including load and declining control section and canned paragraph, wherein the load rises control section as circle
Wimble structure, load peaks and to decline control section be frustum cone structure, the length Sz that the load rises control section be load peaks with
Decline control segment length Sd 40%-60%, and the sectional area of the load peaks and decline control section middle position is small
In the striking face area equal to product.
The length Sz that the load rises control section is the 50% of load peaks and decline control segment length Sd.
The average stress in compression sigma p of the material of the shock loading generating means is not less than 21MPa.
The load rises the circular cone angle α of control section in 15 ° to 25 °.
The conical bottom footpath Φ d1 that the load rises control section are less than the load peaks and decline the bottom footpath Φ of control section
d2。
During test, product hits the shock loading generating means with pre-set velocity in face of circular cone.
This invention is exactly to solve the key technology in high-magnitude strong-impact test equipment, realizes that aircraft protects logger
Not less than the thump check requirements of 6000g/5ms half-sine wave impact energys.
This invention possesses following characteristics：
First, load generating means must possess energy absorption capability, and under external load function, there is obvious compression, i.e.,
Under the effect of known load, sufficiently long stroke can be shown, and there is high compressive strength and weight ratio；It is carried outside
Stresses typical-strain curve under lotus, three phases, i.e. elastic stage, stable plasticity conquassation stage and packing stage can be divided into.
Second, during rammer bump stroke generating means, load generating means collapse energy-absorption only in crash direction,
And do not possess energy releasability after load generating means conquassation, i.e., do not allow " bounce-back " phenomenon occur.
Beneficial effect：The present invention can realize the load not less than 6000g/5ms half-sine wave impact energys, it is easy to accomplish
Trapezoidal wave in standard requirement.
Brief description of the drawings
Fig. 1 is change schematic diagram of the shock loading generating means during product test；
Fig. 2 is theory load curve synoptic diagram；
Fig. 3 is real load curve and theory load curve comparison schematic diagram；
Fig. 4 is the stress-strain behavior curve of shock loading generating means selected materials of the present invention；
Fig. 5 is the cell element characteristic parameter of shock loading generating means selected materials of the present invention；
Fig. 6 is the structural representation of shock loading generating means of the present invention.
Wherein, 1- products, 2- shock loading generating means, 3- load rise control section, and 4- load peaks and decline control
Section, 5- canned paragraphs, the average compression stresses of σ p-, δ-cell element wall thickness, θ-cell element angle, the l- cell element length of sides, α-circular cone angle
Embodiment
The present invention is to be based on specific high impact shock test method, i.e. rammer (such as：Tested products) with certain speed (no
Less than 187.2m/s) specific load generating means is hit, in knockout process, load generating means produces conquassation and destroyed, will
The kinetic energy of rammer is converted into the interior energy of load generating means, forms " G " overload function that rammer is born, and realization is not less than
The thump of 6000g/5ms half-sine wave impact energys, the Strong Impact Loading are showed (such as by acceleration-time graph
Shown in Fig. 3).Certainly, it is extremely difficult for thump is produced accurate half-sine wave Strong Impact Loading.Therefore, one is produced
Kind practical approximate semisinusoidal shock wave or approximate trapezoid shock wave are acceptable, but the integral area under waveform should be extremely
It is few to have and accurate half-sine wave (peak accelerator am：6000g；Pulse width time t：5ms) identical integral area.
As shown in figure 4, load generating means is using a kind of exemplary two dimensional, well-regulated aluminium alloy Multi cell structure material
Material.Because the Multi-halfwaves Filters have relative density small, rigidity is low, and compression deformation ability is big, and deforms the advantages that controllable.Therefore,
By strictly controlling polytope shape, cell element wall thickness δ, cell element length of side l, apparent density ρ and the crucial ginsengs of compression mean stress σ p five
Number, realize the critical material key element of load generating means；As shown in figure 5, load generating means is designed to three-stage structure, including：
Load rises control section 3 (the load rising edge section shown in control figure 3), load peaks section and declines the (institute of control figure 3 of control section 4
The load peaks and trailing edge section shown), load generating means canned paragraph 5.By strictly controlling each section of contour structures feature will
Element, realize load generating means.
Shock-testing is carried out to product using the shock loading generating means of the present invention, comprised the following steps：
1) shock loading generating means material type and average compression stress (σ p) are determined
High impact shock test method shown in Fig. 1 is realized, shock loading generating means material must possess energy absorption capability
The stage is showed with three mechanics shown in Fig. 4.Therefore, by analysis, the loading demands with reference to as defined in thump, as shown in figure 5,
The shock loading generating means material of the present invention have selected a kind of exemplary two dimensional, well-regulated hexagonal honeycomb structural material.
By the characteristic element of product 1 (including：Quality, structural element size) and shock loading generating means 2 hitting
During the energy that absorbs, the compression mean stress σ p (Fig. 4) of shock loading generating means 2 are calculated in analysis.Pass through analysis
Calculate, load generating means of the invention, the compression mean stress σ p for meeting 6000g shock loadings are 21MPa.
2) the cell element characteristic element of load generating means material is determined
Before determining characteristic element, first have to determine the base material for forming honeycomb, base material of the present invention is using aluminium alloy
Material, as shown in figure 5, secondly, according to compression mean stress σ p requirements and the typical calculation formula of hexagonal honeycomb structure, passing through
Material mechanical performance is tested, and determines material cell element angle, θ, cell element wall thickness δ, cell element length of side l and the material of shock loading generating means
The main mechanical characteristics apparent density ρ of material.
This shock loading generating means monolith substrate has selected 3003 aluminum alloy materials, is calculated by analyzing, honeycomb
Characteristic element be：θ is 30 °, δ is 0.15~0.25mm, l is 1~2mm, ρ is 400~500Kg/m3.
3) shock loading generating means structural configuration is determined
First, according to the characteristic element of honeycomb, by honeycomb Mechanics Performance Testing, establish this load and fill
The mechanic constitutive model put, secondly, the high impact shock test method according to Fig. 1, combination product 1 characteristic element (including：Matter
Amount, structural element size) and shock loading requirement, by thump simulation analysis means, devise satisfaction and be not less than 6000g/
The three-stage structure configuration load generating means (Fig. 5) of 5ms half-sine waves impact energy requirement, including：Control load curve rises
The conical structure load on edge rises control section 3, control load peak of curve and the frustum cone structure load peaks of trailing edge and decline
Control section 4 and canned paragraph 5.
Calculated by analyzing, in order to meet, not less than the requirement of 6000g/5ms half-sine waves impact energy, to ensure shock loading
Generating means forms pulse width time stage (such as t of load acceleration-time graph in effective conquassation deformation stage Sm：
5ms), with load generating means penetration phenomenon does not occur for rammer,Sectional area be equal to rammer striking face sectional area；
For the symmetry of the curve of load, that is, ensure the symmetrical of load rising edge curve and trailing edge curve and load peaks point,
Sectional position be located at the 1/2 of round platform length Sd.
Claims (6)
- A kind of 1. shock loading generating means, for carrying out shock-testing to product (1), it is characterised in that：The shock loading is sent out Generating apparatus (2) uses hexagon aluminum alloy honeycomb structure material, and the axis in honeycomb cell element hole is consistent with impact direction, the honeycomb knot The cell element wall thickness δ of structure is 0.15~0.25mm, and cell element angle, θ is 30 °, and cell element length of side l is 1~2mm；The shock loading fills Putting (2) includes load rising control section (3), load peaks along impact direction and declines control section (4) and canned paragraph (5), wherein It is conical structure that the load, which rises control section (3), and load peaks and decline control section (4) are frustum cone structure, in the load The length Sz for rising control section (3) is load peaks and declines the 40%~60% of control section (4) length Sd, and the load peak Value and striking face area of the sectional area less than or equal to product (1) for declining control section (4) middle position.
- 2. shock loading generating means according to claim 1, it is characterised in that：The load rises control section (3) Length Sz is the 50% of load peaks and decline control section (4) length Sd.
- 3. shock loading generating means according to claim 1, it is characterised in that：The shock loading generating means (2) The average stress in compression sigma p of material be not less than 21MPa.
- 4. the shock loading generating means according to Claims 2 or 3, it is characterised in that：The load rises control section (3) Circular cone angle α in 15 ° to 25 °.
- 5. the shock loading generating means according to Claims 2 or 3, it is characterised in that：The load rises control section (3) Conical bottom footpath Φ d1 be less than the load peaks and decline control section (4) bottom footpath Φ d2.
- 6. the shock loading generating means according to any one of claim 1-3, it is characterised in that：During test, product (1) The shock loading generating means is hit in face of circular cone with pre-set velocity.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109543259A (en) * | 2018-11-09 | 2019-03-29 | 中国汽车技术研究中心有限公司 | A method of constructing equivalent full scale vehicle collision waveform |
| CN110940479A (en) * | 2019-12-05 | 2020-03-31 | 中国飞机强度研究所 | Armored vehicle seat explosion impact resistance performance test system and method |
| CN110987469A (en) * | 2019-12-05 | 2020-04-10 | 中国飞机强度研究所 | Armored vehicle seat bench test explosion impact waveform simulation system and method |
| CN113218610A (en) * | 2021-04-08 | 2021-08-06 | 哈尔滨工程大学 | Strong-impact large-pulse-width impact load simulation device and control method thereof |
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| CN110940479A (en) * | 2019-12-05 | 2020-03-31 | 中国飞机强度研究所 | Armored vehicle seat explosion impact resistance performance test system and method |
| CN110987469A (en) * | 2019-12-05 | 2020-04-10 | 中国飞机强度研究所 | Armored vehicle seat bench test explosion impact waveform simulation system and method |
| CN113218610A (en) * | 2021-04-08 | 2021-08-06 | 哈尔滨工程大学 | Strong-impact large-pulse-width impact load simulation device and control method thereof |
| CN113218610B (en) * | 2021-04-08 | 2022-09-06 | 哈尔滨工程大学 | Strong-impact large-pulse-width impact load simulation device and control method thereof |
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| CN107543676B (en) | 2019-05-14 |
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