CN109737836A - A kind of projectile penetrating overload fast appraisement method - Google Patents
A kind of projectile penetrating overload fast appraisement method Download PDFInfo
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- CN109737836A CN109737836A CN201910012780.4A CN201910012780A CN109737836A CN 109737836 A CN109737836 A CN 109737836A CN 201910012780 A CN201910012780 A CN 201910012780A CN 109737836 A CN109737836 A CN 109737836A
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Abstract
The present invention relates to a kind of projectile penetratings to overload fast appraisement method, adopt research conclusion and achievement more mature both at home and abroad at present and be generally used, dimensional analysis is carried out to the characteristic parameter of projectile penetrating overload, experiment is overloaded in conjunction with the projectile penetrating of different bore cannons, and the data of acquisition are handled, the expression of body overload prevention feature parameter calculation formula is obtained after fitting, theoretical calculation is made to projectile penetrating overload with the expression again, after measured data comparison, carry out Fast Evaluation whether can be overloaded to projectile penetrating.The beneficial effects of the present invention are: projectile penetrating proposed by the present invention overloads fast appraisement method, it overcomes at present merely by experiment or the deficiency of theory analysis evaluation projectile penetrating overload, have the characteristics that evaluation result is precisely quick, help to reduce experimentation cost, shorten research cycle, the evaluation that can be applied not only to penetration overload, applies also for the design of penetration experiment body.
Description
Technical field
The present invention relates to projectile penetrating effect technical field, specifically a kind of projectile penetrating overloads fast appraisement method.
Background technique
The overload born during projectile penetrating is much higher than overload when flight in air, generally 10 × 104g
To 5 × 103Between g, this just proposes rigors to experiment body, and can the mechanical property of airframe material meet in the medium
Penetration requirement, body structure design it is whether reasonable, especially if body contains powder charge and fuse, can the stability of powder charge
Meet high overload requirement, fuse intensity must be able to bear high overload, above all to overload closely related, projectile penetrating with projectile penetrating
The accurate evaluation of overload is contrived experiment body and the important foundation sex work for formulating penetration experiment scheme.Currently, projectile penetrating
The research of overload and evaluation means mainly experiment, theory analysis and numerical simulation, experimental result is although intuitive and reliable, but tests
Period is long, it is huge to expend；And numerical simulation is on the one hand since numerical result depends critically upon constitutive model and its parameter
It chooses, on the other hand then since the mechanism of projectile penetrating target is extremely complex, to carry out numerical value to entire mechanism
It calculates, huge calculating grid (mainly object module) is needed to realize this mesh under the premise of guaranteeing computational accuracy
Mark, it is often unpractical under current design conditions；And theory analysis generally all simplifies mechanical process, and point
Analysis result depends critically upon the selection of material model, does not also give explicit solution generally, needs program calculation.
Summary of the invention
The purpose of the present invention is to propose to a kind of projectile penetratings to overload fast appraisement method, abundant Binding experiment and theory analysis
Strong point, and adopt more mature both at home and abroad and the research conclusion and achievement that are generally used at present, solve current projectile penetrating
Evaluation method inaccurate problem not in time is overloaded, realizes the Fast Evaluation of projectile penetrating overload prevention feature parameter.
The invention adopts the following technical scheme:
A kind of projectile penetrating overload fast appraisement method, comprising the following steps:
Step S1: assuming that body is with the positive Penetrating Concrete of conventional bullet speed, body meets rigidity, to the spy of projectile penetrating overload
It levies parameter and carries out dimensional analysis, body overload prevention feature parameter T includes: overload peak Amax, reach overload peak value and last tsAnd
Penetration whole process lasts te, the dependence of all influence factors are as follows:
T=f (M, D, N, V, ρ, σ, g)；
In above formula, M is Shell body quality, D is diameter of the projectile body, and N is the warhead form factor, and wherein warhead form factor N can be by
The geometric dimension of different head shape is directly found out；V is penetration initial velocity, and ρ is target material density, and σ is target material intensity, g
For acceleration of gravity, it is respectively as follows: according to the dimensionless correlation that dimensional analysis exports penetration overload prevention feature parameter
Formula (1), (2), in (3),
Step S2: projectile penetrating overload experiment is carried out, and the data of acquisition are handled；The following steps are included:
Step 2.1: carrying out positive Penetrating Concrete overload measurement serial experiment using different bore cannons, tested before experiment
Overload measurement sensor is installed, measurement method is the memory-type testing recorder that will debug before emitting body in body
It is mounted in body, after test finishes recycling body, takes out recorder, data, traveling wave of going forward side by side shape point are read by data-interface
Analysis processing；
Step 2.2: spectrum analysis is carried out in conjunction with model analysis and to each actual measurement penetration overload signal, with actual first
Rank modal frequency is filtered for cutoff frequency；
Step 2.3: the rigid body overload for being filtered the expeimental cartridge of acquisition to actual measurement overload signal carries out primary, secondary product
Point, respectively obtain Penetration Speed, the penetration displacement of expeimental cartridge；
Step 2.4: the test data in test being filtered using above-mentioned frequency filtering selection principle；And it will count
It is compared according to processing result and actual measurement Penetration Speed, displacement；
Step S3: utilizing improved spherical cavity-expansion theory (SCET), is analyzed for the experiment of penetration overload measurement
It calculates, obtains body acceleration (A), speed (V) and time-history curves and its characteristic parameter for being displaced (Z) in Penetration；
Step S4: pressing (1)~(3) formula, be fitted to body overload prevention feature parameter, after fitting, body overload prevention feature ginseng
The expression of number calculation formula is as follows
WhenWhen,
WhenWhen,
WhenWhen,
WhenWhen,
In above-mentioned expression formula (4)-(15), K, Ks and Ke are the correction factors that subscale test is promoted to prototype,
Wherein
Projectile form factor N are as follows:
N=0.56+0.183LNThe oval bullet of/D,
N=0.56+0.25LN/ D taper bullet；
Step S5: primary data is substituted into, is calculated firstAccording toSize relation, select step
Rapid four about penetration overload calculation formula, calculate the occurrence of each penetration overload prevention feature parameter, with corresponding measured result into
Row compares, and can overload and evaluate to projectile penetrating.
The beneficial effects of the present invention are: projectile penetrating proposed by the present invention overloads fast appraisement method, current list is overcome
The pure deficiency overloaded by experiment or theory analysis evaluation projectile penetrating, has the characteristics that evaluation result is precisely quick, helps to drop
Research cycle is shortened in low experimentation cost, can be applied to the design of penetration experiment body and the evaluation of penetration overload.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below.
Embodiment:
A kind of projectile penetrating overload fast appraisement method, which comprises the following steps:
A kind of projectile penetrating overload fast appraisement method, comprising the following steps:
Step S1: assuming that body is with the positive Penetrating Concrete of conventional bullet speed, body meets rigidity, to the spy of projectile penetrating overload
It levies parameter and carries out dimensional analysis, body overload prevention feature parameter T includes: overload peak Amax, reach overload peak value and last tsAnd
Penetration whole process lasts te, the dependence of all influence factors are as follows:
T=f (M, D, N, V, ρ, σ, g)；
In above formula, M is Shell body quality, D is diameter of the projectile body, and N is the warhead form factor, and wherein warhead form factor N can be by
The geometric dimension of different head shape is directly found out；V is penetration initial velocity, and ρ is target material density, and σ is target material intensity, g
For acceleration of gravity, it is respectively as follows: according to the dimensionless correlation that dimensional analysis exports penetration overload prevention feature parameter
Formula (1), (2), in (3),
Step S2: projectile penetrating overload experiment is carried out, and the data of acquisition are handled；The following steps are included:
Step 2.1: carry out positive Penetrating Concrete overload measurement serial experiment using different bore cannons, initial velocity from
300m/s to 800m/s etc., concrete strength are differed from 30MPa to 80MPa, and experiment Shell body quality is differed from 8kg to 300kg,
Overload measurement sensor is installed in experiment body, measurement method is the storage that will debug before emitting body before experiment
Formula testing recorder is mounted in body, after test finishes recycling body, takes out recorder, reads data by data-interface,
The processing of traveling wave of going forward side by side conformal analysis；
Step 2.2: spectrum analysis is carried out in conjunction with model analysis and to each actual measurement penetration overload signal, with actual first
Rank modal frequency is filtered for cutoff frequency；(for body in penetration target body, process is considerably complicated, acts on body
Various vibration signals are very rich, in surveyed penetration overload waveform in addition to the rigid body overload signal of body itself, inevitably
Can be superimposed with other signals very rich, and STUDY ON THE OVERLOAD CHARACTERISTICS major concern be body itself rigid body overload, to
Rigid body overload is obtained from complicated test signal, it is necessary to carry out at data analysis to measured signal by certain principle
Reason, the signal of removal non-rigid overload frequency content, retains rigid body overload signal.The key of data processing is exactly frequency filtering
Selection, the present invention are to judge actual the in conjunction with model analysis and to the progress spectrum analysis of each actual measurement penetration overload signal
First-order modal frequency is filtered for cutoff frequency).
Step 2.3: the rigid body overload for being filtered the expeimental cartridge of acquisition to actual measurement overload signal carries out primary, secondary product
Point, respectively obtain Penetration Speed, the penetration displacement of expeimental cartridge；
Step 2.4: the test data in test being filtered using above-mentioned frequency filtering selection principle；And it will count
It is compared according to processing result and actual measurement Penetration Speed, displacement；As shown in Table 1,
Table one:
Table 1 overloads integral Penetration Speed, displacement and actual measurement Penetration Speed, displacement data after filtering compares
The method for combining selection filter cutoff frequency with model analysis and measured signal spectrum analysis overloads penetration real
After surveying signal filtering, the Penetration Speed and displacement integrated coincide preferably with actual measurement speed and displacement, and speed worst error is
5.5%, it is displaced worst error 12.7%.
Step S3, it using improved spherical cavity-expansion theory (SCET), is carried out for 12 penetration overload measurement experiments
Analytical calculation obtains body acceleration (A), speed (V) and time-history curves and its characteristic parameter for being displaced (Z) in Penetration,
As shown in Table 2,
Table two:
Table two: body overload measurement waveform and the characteristic value comparison for calculating waveform
Through comparing, body overload measured waveform and the calculated results meet preferably, and characteristic parameter relatively, is counted
It calculates the result is that believable.
Since data sample lacks, it is directed to using authenticated improved spherical cavity-expansion theory and does not carry out overload measurement
170 many cases Penetration into Concrete test carry out calculate, obtain the overload prevention feature parameter of above-mentioned experiment.
Step S4: being fitted body overload prevention feature parameter, obtains the specific of body overload prevention feature parameter calculation formula
Expression formula is as follows:
(1) whenWhen,
(2) whenWhen,
(3) whenWhen,
(4) whenWhen,
K, Ks and Ke are substantially the amendment to subscale test in formula, it is the amendment system that subscale test is promoted to prototype
Number,
Wherein,
Projectile form factor N are as follows:
N=0.56+0.183LNThe oval bullet of/D
N=0.56+0.25LN/ D taper bullet
Step S5: primary data is substituted into, comprising: Shell body quality, diameter of the projectile body, head slenderness ratio, body initial velocity, target
Density and intensity are marked, is calculated firstAccording to Size relation, optional step four about penetration overload
Calculation formula, calculate the occurrence of each penetration overload prevention feature parameter, be compared with corresponding measured result, can be to body
Penetration overload is evaluated.
Part not in the detailed description of the invention is the prior art.
Claims (1)
1. a kind of projectile penetrating overloads fast appraisement method, it is characterized in that: the following steps are included:
Step S1: assuming that body, with the positive Penetrating Concrete of conventional bullet speed, body meets rigidity, the feature of projectile penetrating overload is joined
Number carries out dimensional analysis, and body overload prevention feature parameter T includes: overload peak Amax, reach overload peak value and last tsAnd penetration
Whole process lasts te, the dependence of all influence factors are as follows:
T=f (M, D, N, V, ρ, σ, g)；
In above formula, M is Shell body quality, D is diameter of the projectile body, and N is the warhead form factor, and wherein warhead form factor N can be by difference
The geometric dimension of head shape is directly found out；V is penetration initial velocity, and ρ is target material density, and σ is target material intensity, and g attaches most importance to
Power acceleration is respectively as follows: according to the dimensionless correlation that dimensional analysis exports penetration overload prevention feature parameter
Formula (1), (2), in (3),
Step S2: projectile penetrating overload experiment is carried out, and the data of acquisition are handled；The following steps are included:
Step 2.1: carrying out positive Penetrating Concrete overload measurement serial experiment using different bore cannons, in experiment body before experiment
Middle installation overload measurement sensor, measurement method are to install the memory-type testing recorder debugged before emitting body
In body, after test finishes recycling body, recorder is taken out, data are read by data-interface, at traveling wave of going forward side by side conformal analysis
Reason；
Step 2.2: spectrum analysis is carried out in conjunction with model analysis and to each actual measurement penetration overload signal, with actual First-Order Mode
State frequency is filtered for cutoff frequency；
Step 2.3: the rigid body overload for being filtered the expeimental cartridge of acquisition to actual measurement overload signal carries out primary, quadratic integral, point
Penetration Speed, the penetration displacement of expeimental cartridge are not obtained；
Step 2.4: the test data in test being filtered using above-mentioned frequency filtering selection principle；And it will be at data
Reason result is compared with actual measurement Penetration Speed, displacement；
Step S3: utilizing improved spherical cavity-expansion theory (SCET), tests for penetration overload measurement and carries out analytical calculation,
Obtain body acceleration (A), speed (V) and time-history curves and its characteristic parameter for being displaced (Z) in Penetration；
Step S4: pressing (1)~(3) formula, be fitted to body overload prevention feature parameter, after fitting, body overload prevention feature parameter meter
The expression for calculating formula is as follows
WhenWhen,
WhenWhen,
WhenWhen,
WhenWhen,
In above-mentioned expression formula (4)-(15), K, Ks and Ke are the correction factors that subscale test is promoted to prototype,
Wherein
Projectile form factor N are as follows:
N=0.56+0.183LNThe oval bullet of/D
N=0.56+0.25LN/ D taper bullet
Step S5: primary data is substituted into, is calculated firstAccording toSize relation, optional step four
About the calculation formula of penetration overload, the occurrence of each penetration overload prevention feature parameter is calculated, is compared with corresponding measured result
It is right, projectile penetrating can be overloaded and be evaluated.
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| CN110765668A (en) * | 2019-12-03 | 2020-02-07 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Concrete penetration depth test data abnormal point detection method based on deviation index |
| CN117494420A (en) * | 2023-10-31 | 2024-02-02 | 南京理工大学 | Penetration fuze overload equivalence-based compression ratio test modeling method |
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Cited By (3)
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