CN205404073U - Shock environment register for easy reference down falls test device that effect counter stress responded - Google Patents

Abstract

Shock environment register for easy reference down falls test device that effect counter stress responded, this test device include one or more test unit, and this test unit includes: lower flange, spring, last flange, cantilever beam supporting disk, spacing post and cantilever beam test piece, the utility model discloses an advantage: test device can carry out the collision test of maximum 12 cantilever beams simultaneously, avoids the experimental enviroment to change the interference to the result. Test device can carry out more complicated multi degree of freedom system register for easy reference and fall effect counter stress response research test. Test device can bear the collision test of multiple surge waveform. The natural frequency accessible of cantilever beam test piece changes quality piece quality and adjusts change, convenient and fast.

Description

Under shock environment, spectrum falls the assay device of effect counter stress response

Technical field

This utility model relates to spectrum under a kind of shock environment and falls assay device and the method for testing of the response of effect counter stress, can measure how group different natural frequencies test specimen composes the assay device and method of testing that fall the response of effect counter stress under identical shock environment particularly to a kind of simultaneously.

Background technology

Owing to naval vessels inevitably suffers the attack of the underwater weapon such as torpedo, submarine mine when fighting, ship's fitting is the weak link affecting naval vessel impact resistance, and therefore, ship's fitting has all been carried out substantial amounts of impact test by big country of many naval of the world.

The elastic installation of the Flexural cantilever model simulation ship's fitting of related scientific research personnel's superposition of the U.S. carries out impact test, by measuring the stress response of different natural frequencies cantilever beam, draw out stress impact response spectra, thus reflecting the impact failure situation of different natural frequencies parts in ship's fitting, the result that this kind of simulating experimental obtains is not only representative, but also it is found that " spectrum is fallen " effect, that is: when many-degrees of freedom system is subject to impacting, the response condition of the inertia force meeting appreciable impact infrastructure devices of upper layer device, there is significant trough at upper layer device first natural frequency place in the shock response spectrum making infrastructure devices, effect is fallen by studying spectrum, the design shock response spectrum of ship's fitting etc. can be improved, reduce design difficulty and the R&D costs of ship's fitting, paid much attention to by countries such as the U.S..Representative O ' Hara et al. spectrum based on cantilever beam mentioned in " ImpedenceandShockSpectra " and " TheShockSpectrumDipEffect " paper that has falls effect impact test model and double-layer spring oscillator simplified mathematical model.

At present, this type of assay device model has a disadvantage in that in (1) test and needs to change a secondary beam test specimen after every Secondary Shocks, both wastes time and energy, again it cannot be guaranteed that the concordance of impact test environment.(2) test specimen structure is only suitable for hammering method impact test, and namely excited by impact can only be pulse excitation, and the produced surge waveform of the blast of noncontact under water is positive and negative double wave.(3) device that is put to the test is limit, and is not suitable for directly measuring the stress response change of test specimen, lacks intuitive.Accordingly, it would be desirable to a kind of many group different natural frequencies cantilever beam test specimens spectrum of maximum stress response under uniform impingement environment of can measuring falls effect study device simultaneously.

Utility model content

Utility model purpose: this utility model provides spectrum under a kind of shock environment and falls assay device and the method for testing of the response of effect counter stress, its objective is that improving existing spectrum falls effect impact test apparatus so that it is multiple surge waveform can be born, multiple degrees of freedom elasticity can install and can carry out simultaneously many cantilever beams impact test under equivalent environment and stress response test.

Technical scheme: this utility model is achieved through the following technical solutions:

Under shock environment, spectrum falls the assay device of effect counter stress response, it is characterised in that: this assay device includes one or more test unit, and this test unit includes: lower flange, spring, upper flange, cantilever beam prop up support plate, limited post and cantilever beam test specimen；Lower flange connects bottom limited post, and spring housing is fixed on four flanges of lower flange in the peripheral also lower end of limited post, and upper flange is connected fixing through limited post with the upper end of spring；Cantilever beam props up support plate and through limited post and is connected with upper flange fixing；Cantilever beam test specimen is plugged on cantilever beam and props up the sidewall surrounding of support plate.

Cantilever beam test specimen includes: cantilever beam and mass；Described mass is positioned at cantilever beam end, and mass coordinates to be connected with cantilever beam by bolt and nut to be fixed.

Cantilever beam props up and has countersunk head screwed hole and rectangular opening on support plate, axial and the cantilever beam of countersunk head screwed hole props up the axially identical of support plate, rectangular opening is opened in cantilever beam and props up the side of support plate, the radial direction that the length direction of rectangular opening props up support plate with cantilever beam is identical, cantilever beam injects in rectangular opening, the part that cantilever beam injects in rectangular opening is provided with Upper gasket and lower gasket, Upper gasket and lower gasket are separately positioned on cantilever beam above and below, hex screw is through countersunk head screwed hole and pushes down compress gasket, locks described cantilever beam test specimen by compress gasket.

The pendency root of cantilever beam posts foil gauge or equipped with strain type stress sensor.

Limited post is affixed on shock machine test platform, and cantilever beam props up support plate and is installed 12 cantilever beam test specimens.

Cantilever beam props up the quality of support plate and is at least five times of 12 cantilever beam test specimen quality summations；Cantilever beam props up the quality of support plate and is at least the octuple of upper flange quality；Upper flange is equal with the quality of lower flange.

Cantilever beam props up the quality control of support plate within the scope of 50kg-100kg.

Described assay device is made up of one or more test units, and upper and lower for each test unit superposition is installed the assay device constituting many test units.

Spectrum under above-mentioned shock environment is utilized to fall the test method that the assay device of effect counter stress response is implemented, it is characterised in that: the method mainly comprises the following steps:

1., the natural frequency of single test unit in survey calculation many groups test unit, afterwards this test unit is fixedly mounted on shock machine, by shock machine, this assay device is loaded required vertical direction shock loading, again through the maximum stress response of cantilever beam test specimen (3) in the impact process that the foil gauge on cantilever beam test specimen (3) or strain type stress sensor (20) monitor, draw out the frequency-stress curve of cantilever beam test specimen；

2., on single experimental considerations unit described in 1. another single test unit superposition of group is arranged on, the Double-layer elastic installation test device of composition, afterwards this Double-layer elastic installation test device is carried out and 1. identical impact test, and draw out the frequency-stress curve of cantilever beam test specimen (3), the crest place of this curve comparison 1. middle stress response curve there will be obvious trough, and namely spectrum falls effect；

3., the spectrum of the cantilever beam test specimen (3) that the 2. process that repeats can obtain multilayer elastic installation test device falls the stress response situation that effect is corresponding.

Cantilever beam test specimen is made up of distal aperture cantilever beam and mass, mass is connected fixing with cantilever beam by bolt and nut, for different test demands, can according to formula (1), the area of section keeping cantilever beam immobilizes and changes its length, or the mass quality that maintenance cantilever beam form parameter its end of constant change hangs, the cantilever beam test specimen choosing maximum 12 different natural frequencies carries out impact test:

$f_n\≈\frac{1}{2\mathrm{\π}}\sqrt{\frac{3EI}{(0.2427\mathrm{\ρ}AL+m)L^3}}---\left(1\right)$

In formula, f_nRepresenting the cantilever beam first natural frequency at impact direction, E represents the elastic modelling quantity of cantilever beam, and I represents the cross sectional moment of inertia of cantilever beam, and A represents the area of section of cantilever beam, and L represents the length of cantilever beam, and m represents mass quality.

Advantage of the present utility model:

(1) described assay device can carry out the impact test of maximum 12 cantilever beams simultaneously, it is to avoid the experimental enviroment change interference to result.

(2) described assay device can carry out increasingly complex many-degrees of freedom system spectrum and fall the test of effect counter stress response investigations.

(3) described assay device can bear the impact test of multiple surge waveform.

(4) natural frequency of cantilever beam test specimen can be adjusted change by change mass quality, convenient and swift.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Fig. 2 is upper flange of the present utility model and lower flange schematic diagram.

Fig. 3 is the top view that cantilever beam of the present utility model props up support plate

Fig. 4 is the A-A sectional view of Fig. 3.

Fig. 5 is that in this utility model, cantilever beam test specimen is installed cantilever beam sectional view when propping up support plate.

Fig. 6 is the structural representation of the two degrees of freedom Double-layer elastic installation test device that composition is installed in assay device superposition in Fig. 1.

Fig. 7 is cantilever beam test specimen frequency-stress double-log relation curve that the assay device shown in Fig. 1 and Fig. 6 carries out that impact test obtains.

Detailed description of the invention

Below in conjunction with accompanying drawing, this utility model is described further:

Under shock environment, spectrum falls the assay device of effect counter stress response, and this assay device includes one or more test unit, and this test unit includes: lower flange 11, spring 10, upper flange 9, cantilever beam prop up support plate 2, limited post 1 and cantilever beam test specimen 3；Lower flange 11 connects bottom limited post 1, and spring 10 is enclosed within limited post 1 periphery and lower end is fixed on four flanges of lower flange 11, and spring 10 can be four.Upper flange 9 is connected fixing through limited post 1 with the upper end of spring 10；Cantilever beam props up support plate 2 and through limited post 1 and is connected with upper flange 9 fixing；Cantilever beam is propped up support plate 2 and can be connected with upper flange 9 by bolt 7 and nut 8 fixing；Cantilever beam test specimen 3 is plugged on cantilever beam and props up the sidewall surrounding of support plate 2.

Cantilever beam test specimen 3 includes: cantilever beam 21 and mass 5；Described mass 5 is positioned at cantilever beam 21 end, and mass 5 coordinates to be connected with cantilever beam 21 by bolt 4 nut 6 to be fixed.The length of cantilever beam 21 or the quality of mass 5 can be changed to obtain the cantilever beam test specimen 3 of different natural frequencies before testing.

Cantilever beam props up and has countersunk head screwed hole rectangular opening 18 on support plate 2, screwed hole as shown in Figure 4 15, shown in 16, shown in figure it is two, axial and the cantilever beam of countersunk head screwed hole props up the axially identical of support plate 2, rectangular opening 18 is opened in cantilever beam and props up the side of support plate 2, the radial direction that the length direction of rectangular opening 18 props up support plate 2 with cantilever beam is identical, cantilever beam 21 injects in rectangular opening 18, cantilever beam 21 injects the part in rectangular opening 18 and is provided with Upper gasket 19 and lower gasket 22, Upper gasket 19 and lower gasket 22 are separately positioned on cantilever beam 21 above and below, hex screw traverse countersunk head screwed hole 15, 16 and push down compress gasket 19, described cantilever beam test specimen 3 is locked by compress gasket 19.Hex screw is two, 12,13 as shown in Figure 5.

The pendency root of cantilever beam 21 posts foil gauge or equipped with strain type stress sensor 20, for detecting the stress response of cantilever beam test specimen 3 in impact test.

Limited post 1 is affixed on shock machine test platform, and cantilever beam props up support plate 2 and can be installed at most 12 cantilever beam test specimens 3.

Cantilever beam props up the quality of support plate 2 and is at least five times of 12 cantilever beam test specimen 3 mass summations；Cantilever beam props up the quality of support plate 2 and is at least the octuple of upper flange 9 mass；Upper flange 9 is of substantially equal with the quality of lower flange 11.

Cantilever beam props up the quality of support plate 2 and should control within the scope of 50kg-100kg.

Described assay device is made up of one or more test units, and upper and lower for each test unit superposition is installed the assay device constituting many test units.That is constitute double-deck or multilayer elastic installation (two degrees of freedom and many-degrees of freedom system) spectrum after superposition and fall the assay device of effect counter stress response.

Cantilever beam test specimen is made up of distal aperture cantilever beam and mass, mass is connected fixing with cantilever beam by bolt and nut, for different test demands, can according to formula (1), the area of section keeping cantilever beam immobilizes and changes its length, or the mass quality that maintenance cantilever beam form parameter its end of constant change hangs, the cantilever beam test specimen choosing maximum 12 different natural frequencies carries out impact test:

$f_n\≈\frac{1}{2\mathrm{\π}}\sqrt{\frac{3EI}{(0.2427\mathrm{\ρ}AL+m)L^3}}---\left(1\right)$

In formula, f_nRepresenting the cantilever beam first natural frequency at impact direction, E represents the elastic modelling quantity of cantilever beam, and I represents the cross sectional moment of inertia of cantilever beam, and A represents the area of section of cantilever beam, and L represents the length of cantilever beam, and m represents mass quality.

Prop up at cantilever beam and support plate 2 is provided with four spacing holes 14 and four bolts hole 17.Spacing hole 14 is used for through limited post 1；Bolt 7 coordinates through bolt hole 17 with nut 8；Soket head cap screw 12,13 and countersunk head screwed hole 16,15 lock the cantilever beam test specimen 3 being positioned at rectangular opening 18 mesopore.

In sum, lower flange and upper flange are by connecting to form spring support with four column type drawing-pressing springs, and spring support can be installed on impact test machine platform；

Cantilever beam is propped up support plate and is connected by bolt and nut fixing with upper flange, 12 rectangular openings of uniform array about, for convenience of processing, prop up support plate to be manufactured by two pieces of disks splicings, cantilever beam test specimen is locked with soket head cap screw in described square hole, pad is all laid in cantilever beam test specimen locking place up and down, and cantilever beam pendency root pastes foil gauge or installs strain type stress sensor, for detecting the stress response of cantilever beam in impact test；

Four limited posts are installed on impact test machine platform, and spring support and cantilever beam prop up support plate and both pass through limited post installation, for the degree of freedom of constrained test device.

Before testing, prepare the test unit described at least two groups, measure the overall natural frequency often organizing test unit；Described battery of tests device is fixedly mounted on shock machine, forms single layer elastomeric installation test device；Described assay device superposition is installed on described single layer elastomeric installation test device, becomes the spectrum that Double-layer elastic is installed and multilayer elastic is installed and fall effect test device；Successively single layer elastomeric installation test device, bilayer and multilayer elastic installation test device are carried out identical impact test.During test, by shock machine, described spectrum is fallen effect test device and load required vertical direction shock loading, again through the maximum stress response of cantilever beam test specimen in the impact process that the foil gauge on cantilever beam test specimen or strain type stress sensor monitor, draw out the frequency-stress curve of cantilever beam test specimen, wherein, can there is obvious trough at the stress curve place that the natural frequency of the upper strata assay device of described multilayer elastic installation test device is corresponding in the frequency-stress curve of bottom cantilever beam test specimen, and namely spectrum falls effect.Change the natural frequency of impact condition and cantilever beam test specimen, the spectrum under different situations can be studied and fall the rule of effect counter stress response.

Cantilever beam test specimen 3 be installed cantilever beam structure when propping up support plate 2 as it is shown in figure 5,

Test unit entirety superposition shown in Fig. 1 being installed the spectrum that can obtain bilayer or multilayer elastic installation (two degrees of freedom or many-degrees of freedom system) and falls effect test device, wherein Double-layer elastic installation spectrum falls effect test device as shown in Figure 6.

Composing the method for testing falling the response of effect counter stress under a kind of shock environment is: 1., the natural frequency of survey calculation many groups single layer elastomeric installation test device as shown in Figure 1, afterwards one of which assay device is fixedly mounted on shock machine, by shock machine, this assay device is loaded required vertical direction shock loading, again through the maximum stress response of cantilever beam test specimen 3 in the impact process that the foil gauge on cantilever beam test specimen 3 or strain type stress sensor 20 monitor, draw out the frequency-stress curve of cantilever beam test specimen.2., another group single layer elastomeric installation test device superposition as shown in Figure 1 is arranged on above-mentioned single layer elastomeric installation test device, the Double-layer elastic installation test device of composition is as shown in Figure 6, afterwards this Double-layer elastic installation test device is carried out and 1. identical impact test, and draw out the frequency-stress curve of cantilever beam test specimen 3, the crest place of this curve comparison 1. middle stress response curve there will be obvious trough, and namely spectrum falls effect.3., the spectrum of the cantilever beam test specimen 3 that the 2. process that repeats can obtain multilayer elastic installation test device falls the stress response situation that effect is corresponding.

Wherein, single layer elastomeric installs the contrast test effect with Double-layer elastic installation as shown in Figure 7, when the lower floor cantilever beam stress response curve contrast monolayer corresponding at 20Hz place is installed, the crest location of cantilever beam stress response curve occurs in that obvious trough, and namely spectrum falls effect.

This utility model is rational in infrastructure, operating process science is convenient, the parts in ship's fitting are simulated by cantilever beam test specimen, emulation ship's fitting stress response situation when being subject to noncontact blast impulse under water, test effect is true and reliable, and the research that spectrum is fallen effect and corresponding stress response rule thereof has bigger using value and military significance.

Claims (8)

1. under shock environment, spectrum falls the assay device of effect counter stress response, it is characterized in that: this assay device includes one or more test unit, this test unit includes: lower flange (11), spring (10), upper flange (9), cantilever beam prop up support plate (2), limited post (1) and cantilever beam test specimen (3)；Lower flange (11) connects limited post (1) bottom, and spring (10) is enclosed within limited post (1) periphery and lower end is fixed on four flanges of lower flange (11), and upper flange (9) is connected fixing through limited post (1) with the upper end of spring (10)；Cantilever beam props up support plate (2) and through limited post (1) and is connected with upper flange (9) fixing；Cantilever beam test specimen (3) is plugged on cantilever beam and props up the sidewall surrounding of support plate (2).

2. under shock environment according to claim 1, spectrum falls the assay device of effect counter stress response, it is characterised in that: cantilever beam test specimen (3) including: cantilever beam (21) and mass (5)；Described mass (5) is positioned at cantilever beam (21) end, and mass (5) coordinates to be connected with cantilever beam (21) by bolt (4) nut (6) to be fixed.

null3. under shock environment according to claim 2, spectrum falls the assay device of effect counter stress response，It is characterized in that: cantilever beam props up and has countersunk head screwed hole (15 on support plate (2)、16) and rectangular opening (18)，Axial and the cantilever beam of countersunk head screwed hole props up the axially identical of support plate (2)，Rectangular opening (18) is opened in cantilever beam and props up the side of support plate (2)，The radial direction that the length direction of rectangular opening (18) props up support plate (2) with cantilever beam is identical，Cantilever beam (21) injects in rectangular opening (18)，The part that cantilever beam (21) injects in rectangular opening (18) is provided with Upper gasket (19) and lower gasket (22)，Upper gasket (19) and lower gasket (22) are separately positioned on cantilever beam (21) above and below，Hex screw (12、13) through countersunk head screwed hole (15、16) and push down compress gasket (19)，Described cantilever beam test specimen (3) is locked by compress gasket (19).

4. under shock environment according to claim 2, spectrum falls the assay device of effect counter stress response, it is characterised in that: the pendency root of cantilever beam (21) posts foil gauge or equipped with strain type stress sensor (20).

5. under shock environment according to claim 1, spectrum falls the assay device of effect counter stress response, it is characterized in that: limited post (1) is affixed on shock machine test platform, cantilever beam props up support plate (2) and is installed 12 cantilever beam test specimens (3).

6. under shock environment according to claim 1, spectrum falls the assay device of effect counter stress response, it is characterised in that: cantilever beam props up the quality of support plate (2) and is at least five times of 12 cantilever beam test specimen (3) quality summations；Cantilever beam props up the quality of support plate (2) and is at least the octuple of upper flange (9) quality；Upper flange (9) is equal with the quality of lower flange (11).

7. under shock environment according to claim 6, spectrum falls the assay device of effect counter stress response, it is characterised in that: cantilever beam props up the quality control of support plate (2) within the scope of 50kg-100kg.

8. under shock environment according to claim 1, spectrum falls the assay device of effect counter stress response, it is characterized in that: described assay device is made up of one or more test units, upper and lower for each test unit superposition is installed the assay device constituting many test units.