CN108716987A - It is a kind of it is dry cut cut to pieces serrated knife cutting edge load distribution measurement method and system - Google Patents
It is a kind of it is dry cut cut to pieces serrated knife cutting edge load distribution measurement method and system Download PDFInfo
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- CN108716987A CN108716987A CN201810491697.5A CN201810491697A CN108716987A CN 108716987 A CN108716987 A CN 108716987A CN 201810491697 A CN201810491697 A CN 201810491697A CN 108716987 A CN108716987 A CN 108716987A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
The invention belongs to load distribution measurement techniques field, disclose it is a kind of it is dry cut the measurement method and system for cutting the distribution of serrated knife cutting edge load to pieces, support base is provided with, by being fixed with support platform by four pedestal fixing bolts in the support base of both sides.The centre of support platform is fixed with I-shaped iron block by two I-shaped iron block fixing bolts, and both sides are welded with two sensing chips before I-shaped iron block, is welded with signal output in I-shaped iron block side, signal output is connect with two sensing chips.Support platform is fixed with test platform by four support platform fixing bolts, and the centre of test platform is provided with cutting groove, damping spring is cased on four support platform fixing bolts.Crimp suffered by object is converted to different electric signals by the measuring device of blade cutting force load distribution, to indirectly calculate size and the distribution of blade load, party's subtraction unit is simple, easy to operate, can more be precisely calculated the distributed load of blade.
Description
Technical field
The invention belongs to load measurement technical fields more particularly to a kind of dry cut to cut the distribution of serrated knife cutting edge load to pieces
Measurement method and system.
Background technology
Load test is instrument tool indispensable important link in manufacture, load test the purpose is to
Whether the product for verifying design meets actual need of work.Testing crew will be according to actual production requirement come accurately
How survey tool surface or internal load are distributed, so as to so that the rational deisgn product of designer.Currently, blade
Lack the load measurement experiment of blade after producing so that designer is unable to get blade in actual production application
True stressing conditions and load distribution so that the product design improvement in later stage lacks accurate data.
In conclusion problem of the existing technology is：Blade lacks relevant chip-load experiment, can not be the later stage
Improved product provides good data and supports.
Invention content
In view of the problems of the existing technology, the present invention provides it is a kind of it is dry cut cut to pieces serrated knife cutting edge load distribution measurement
Device.
The invention is realized in this way a kind of dry cut cuts the measuring device that serrated knife cutting edge load is distributed to pieces, blade cutting
The measuring device both sides of sword load distribution are provided with support base, and spiral shells are fixed by passing through four pedestals in the support base of both sides
Bolt is fixed with support platform.The centre of support platform is fixed with I-shaped iron block, work by two I-shaped iron block fixing bolts
Both sides are welded with two sensing chips before font iron block, and signal output, signal output are welded in I-shaped iron block side
It is connect with two sensing chips.Support platform is fixed with test platform by four support platform fixing bolts, in test platform
Between be provided with cutting groove, be cased with damping spring on four support platform fixing bolts.
Another object of the present invention is to provide a kind of dry cut to cut the measurement method of serrated knife cutting edge load distribution to pieces, described dry
Cut cut to pieces serrated knife cutting edge load distribution measurement method include：On test platform with blade in platform surface and cutting groove
Cutting simulation action is done, test platform is under pressure and crimp occurs, and following fixed I-shaped iron block is driven to make phase
With crimp, produce due to deformation degree of extrusion of the sensing chip at left and right sides of I-shaped iron block on I-shaped iron block is different
Raw different electric signal, is exported by signal output, is transmitted on host computer, calculated by signal imitation, can calculate blade
The distribution situation of chip-load；
The expression formula for the crimp time-frequency overlapped signal that the host computer receives is as follows：
Y (t)=x1(t)+x2(t)+…xp(t)+n(t)；
Wherein xi(t) indicate that i-th of component crimp signal, p are component crimp signal number, n (t) indicates high
This noise crimp signal, y (t) indicate that the time-frequency received is overlapped crimp signal, and the expression formula of Third-order cumulants is such as
Under：
C3y(τ1,τ2)=E [y (t) y (t+ τ1)y(t+τ2)]；
Wherein, τ1, τ2For two different delays；By the property of Third-order cumulants, the Third-order cumulants of Gaussian noise are constantly equal to
Zero, above formula is expressed as：
It enablesThat is C3y(τ1,τ2)=C3x(τ1,
τ2)；
To C3y(τ1,τ2) carry out the bispectrum B that time-frequency overlapping crimp signal can be obtained in secondary Fourier transformation3y(ω1,
ω2)：
B3y(ω1,ω2)=B3x(ω1,ω2)=X (ω1)X(ω2)X*(ω1+ω2)；
Wherein, ω1, ω2For two different frequencies；
The crimp signal model of the host computer time-frequency overlapping MASK is expressed as：
Wherein, N is the signal component number that time-frequency is overlapped crimp signal, and n (t) is additive white Gaussian noise, si(t)
For the signal component of time-frequency overlapped signal, it is expressed asA in formulai
Indicate the amplitude of crimp signal component, ai(m) indicate that the symbol of signal component, p (t) indicate molding filter function, Ti
Indicate the code-element period of crimp signal component, fciIndicate the carrier frequency of crimp signal component,It indicates to squeeze and become
The phase of shape signal component；The diagonal slice spectrum of the cyclic bispectrum of MASK signals is expressed as：
Wherein, y (t) indicates MASK signals, and α is the cycle frequency of y (t), fcIndicate the carrier frequency of crimp signal,
T is the code-element period of crimp signal, and k is integer,Ca,3Indicate the Third-order cumulants of random sequence a, δ ()
It is impulse function, P (f) is molding impulse function, and expression formula is：
The sections f=0 are taken to obtain the diagonal slice spectrum of cyclic bispectrum：
For MASK signals, the sections f=0 of the diagonal slice spectrum of cyclic bispectrum, at place, there are peak values, and carry extruding
The carrier frequency information of deformation signal；Since the diagonal slice spectrum of cyclic bispectrum meets linear superposition, then time-frequency is overlapped MASK signals
The expression formula of the diagonal slice spectrum of cyclic bispectrum is：
Wherein,It is constant, T related with the modulation system of i-th of crimp signal componentiIt is i-th of crimp
The code-element period of signal component.
Further, the Distribution Value conversion method of the blade chip-load includes：
Y indicates transformed result；M1The conversion value of A/D converter when transmitter output is full scale；M0Output is zero
The conversion value of A/D converter when point；MoutThe conversion value of A/D converter when certain primary sampling；S1The upper limit of measurement parameter；S0
The lower limit of measurement parameter.
Further, the distribution situation that the host computer calculates blade chip-load by signal imitation includes：It is born
Load：
P0=T0/(k0·d0) (3)
It is respectively from the heat flow density of rake face and flank inflow blade respectively in unit interval, on unit area：
Advantages of the present invention and good effect are：The measuring device of blade cutting edge load distribution will squeeze suffered by object
Compressive strain is converted to different electric signals, and to indirectly calculate size and the distribution of blade load, party's subtraction unit is simple,
It is easy to operate, it can more be precisely calculated the distributed load of blade.
Description of the drawings
Fig. 1 is the structural schematic diagram of the measuring device of blade cutting edge load distribution provided in an embodiment of the present invention；
Fig. 2 is the configuration schematic diagram of the measuring device of blade cutting edge load distribution provided in an embodiment of the present invention；
In figure：1, support base；2, support platform；3, damping spring；4, test platform；5, groove is cut；6, I-shaped
Iron block；7, signal output；8, sensing chip；9, pedestal fixing bolt；10, support platform fixing bolt；11, I-shaped iron block is solid
Determine bolt.
Specific implementation mode
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and coordinate attached drawing
Detailed description are as follows.
The structure of the present invention is explained in detail below in conjunction with the accompanying drawings.
As depicted in figs. 1 and 2, the measuring device both sides setting of blade cutting edge load distribution provided in an embodiment of the present invention
There is a support base 1, it is 2 flat by being fixed with support by four pedestal fixing bolts 9 in the support base 1 of both sides.Support is flat
The centre of platform 2 is fixed with I-shaped iron block 6, the weldering of 6 front both sides of I-shaped iron block by two I-shaped iron block fixing bolts 11
It connects there are two sensing chip 8, is welded with signal output 7 in 6 side of I-shaped iron block, signal output 7 and two sensing chips 8 connect
It connects.Support platform 2 is fixed with test platform 4 by four support platform fixing bolts 10, and the centre of test platform 4 is provided with cutting
Groove 5 is cased with damping spring 3 on four support platform fixing bolts 10.
The present invention operation principle be：On test platform 4 cutting mould is done in platform surface and cutting groove 5 with blade
Quasi- action, test platform 4 are under pressure and crimp occur, and following fixed I-shaped iron block 6 is driven to make identical squeeze
Compressive strain, the sensing chip 8 on I-shaped iron block 6 are generated because the deformation degree of extrusion of 6 left and right sides of I-shaped iron block is different
Different electric signals is exported by signal output 7, is transmitted on host computer, calculated by signal imitation, can be calculated blade and be cut
Cut the distribution situation of load.
The above is only the preferred embodiments of the present invention, and is not intended to limit the present invention in any form,
Every any simple modification made to the above embodiment according to the technical essence of the invention, equivalent variations and modification, belong to
In the range of technical solution of the present invention.
Claims (7)
1. a kind of dry cut cuts the measurement method that serrated knife cutting edge load is distributed to pieces, which is characterized in that dry cut cuts serrated knife cutting edge to pieces
Load distribution measurement method include：Cutting simulation is done on test platform in platform surface and cutting groove with blade to move
To make, test platform is under pressure and crimp occurs, and following fixed I-shaped iron block is driven to make identical crimp,
Different telecommunications is generated due to deformation degree of extrusion of the sensing chip at left and right sides of I-shaped iron block on I-shaped iron block is different
Number, it is exported, is transmitted on host computer by signal output, calculated by signal imitation, point of blade chip-load can be calculated
Cloth situation；
The expression formula for the crimp time-frequency overlapped signal that the host computer receives is as follows：
Y (t)=x1(t)+x2(t)+…xp(t)+n(t)；
Wherein xi(t) indicate that i-th of component crimp signal, p are component crimp signal number, n (t) indicates that Gauss makes an uproar
Sound crimp signal, y (t) indicate that the time-frequency received is overlapped crimp signal, and the expression formula of Third-order cumulants is as follows：
C3y(τ1,τ2)=E [y (t) y (t+ τ1)y(t+τ2)]；
Wherein, τ1, τ2For two different delays；By the property of Third-order cumulants, the Third-order cumulants identically vanishing of Gaussian noise,
Above formula is expressed as：
It enablesThat is C3y(τ1,τ2)=C3x(τ1,τ2)；
To C3y(τ1,τ2) carry out the bispectrum B that time-frequency overlapping crimp signal can be obtained in secondary Fourier transformation3y(ω1,ω2)：
B3y(ω1,ω2)=B3x(ω1,ω2)=X (ω1)X(ω2)X*(ω1+ω2)；
Wherein, ω1, ω2For two different frequencies；
The crimp signal model of the host computer time-frequency overlapping MASK is expressed as：
Wherein, N is the signal component number that time-frequency is overlapped crimp signal, and n (t) is additive white Gaussian noise, si(t) when being
The signal component of frequency overlapped signal, is expressed asA in formulaiIt indicates
The amplitude of crimp signal component, ai(m) indicate that the symbol of signal component, p (t) indicate molding filter function, TiIt indicates
The code-element period of crimp signal component, fciIndicate the carrier frequency of crimp signal component,Indicate crimp letter
The phase of number component；The diagonal slice spectrum of the cyclic bispectrum of MASK signals is expressed as：
Wherein, y (t) indicates MASK signals, and α is the cycle frequency of y (t), fcIndicate the carrier frequency of crimp signal, T is crowded
The code-element period of compressive strain signal, k are integer,Ca,3Indicate the Third-order cumulants of random sequence a, δ () is impulse
Function, P (f) are molding impulse functions, and expression formula is：
The sections f=0 are taken to obtain the diagonal slice spectrum of cyclic bispectrum：
For MASK signals, the sections f=0 of the diagonal slice spectrum of cyclic bispectrum, at place, there are peak values, and carry crimp
The carrier frequency information of signal；Since the diagonal slice spectrum of cyclic bispectrum meets linear superposition, then time-frequency is overlapped MASK signal cycles
The expression formula of the diagonal slice spectrum of bispectrum is：
Wherein,It is constant, T related with the modulation system of i-th of crimp signal componentiIt is i-th of crimp signal
The code-element period of component.
2. dry the measurement method for cutting the distribution of serrated knife cutting edge load to pieces is cut as described in claim 1, which is characterized in that described dry to cut
The Distribution Value conversion method for cutting serrated knife chip-load to pieces includes：
Y indicates transformed result；M1The conversion value of A/D converter when transmitter output is full scale；M0When output is zero
The conversion value of A/D converter；MoutThe conversion value of A/D converter when certain primary sampling；S1The upper limit of measurement parameter；S0It measures
The lower limit of parameter.
3. dry cut as described in claim 1 cuts the measurement method that serrated knife cutting edge load is distributed to pieces, which is characterized in that described upper
The distribution situation that machine calculates blade chip-load by signal imitation includes：The load born：
P0=T0/(k0+d0） (3)
It is respectively from the heat flow density of rake face and flank inflow blade respectively in unit interval, on unit area：
4. a kind of dry cut for cutting the measurement method for cutting the distribution of serrated knife cutting edge load to pieces dry as described in claim 1 cuts serrated knife cutting edge to pieces
The measuring device of load distribution, which is characterized in that dry cut cuts the measuring device both sides setting that serrated knife cutting edge load is distributed to pieces
There is a support base, by being fixed with support platform by four pedestal fixing bolts in the support base of both sides；Support platform
Centre is fixed with I-shaped iron block by two I-shaped iron block fixing bolts, and both sides are welded with two senses before I-shaped iron block
Piece is answered, is welded with signal output in I-shaped iron block side, signal output is connect with two sensing chips；Support platform passes through
Four support platform fixing bolts are fixed with test platform, and the centre of test platform is provided with cutting groove, and four support platforms are solid
Determine to be cased with damping spring on bolt.
5. dry cut as described in claim 1 cuts the measuring device that serrated knife cutting edge load is distributed to pieces, which is characterized in that the test
The intermediate longitudinal direction of platform is provided with a cutting groove.
6. dry cut as described in claim 1 cuts the measuring device that serrated knife cutting edge load is distributed to pieces, which is characterized in that described four
It is cased with damping spring on support platform fixing bolt.
7. dry cut as described in claim 1 cuts the measuring device that serrated knife cutting edge load is distributed to pieces, which is characterized in that the I-shaped
Both sides are welded with two sensing chips before sections block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810491697.5A CN108716987B (en) | 2018-05-22 | 2018-05-22 | Method and system for measuring load distribution of cutting edge of dry cutting serrated knife |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810491697.5A CN108716987B (en) | 2018-05-22 | 2018-05-22 | Method and system for measuring load distribution of cutting edge of dry cutting serrated knife |
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| Publication Number | Publication Date |
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| CN108716987A true CN108716987A (en) | 2018-10-30 |
| CN108716987B CN108716987B (en) | 2020-04-14 |
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Citations (6)
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|---|---|---|---|---|
| WO1991010925A1 (en) * | 1990-01-12 | 1991-07-25 | Eastman Kodak Company | Novel optical element for employment in the foucault knife-edge method |
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| CN202117684U (en) * | 2011-07-18 | 2012-01-18 | 无锡盾建重工制造有限公司 | End cap fixed type double-edge hob with abrasion display function for shield machine |
| CN103411820A (en) * | 2013-08-21 | 2013-11-27 | 王金仓 | Multi-azimuth synchronous load testing machine and control method thereof |
| CN204439355U (en) * | 2015-03-12 | 2015-07-01 | 中国矿业大学(北京) | A kind of rolling bearing radial force charger |
| CN107944174A (en) * | 2017-12-06 | 2018-04-20 | 清华大学 | A kind of roller gear Longitudinal Load Distribution Factors acquisition methods |
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2018
- 2018-05-22 CN CN201810491697.5A patent/CN108716987B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991010925A1 (en) * | 1990-01-12 | 1991-07-25 | Eastman Kodak Company | Novel optical element for employment in the foucault knife-edge method |
| EP2260983A3 (en) * | 2009-06-08 | 2011-03-02 | Promec bvba | Apparatus and method for precisely cutting an elastomer or rubber edge |
| CN202117684U (en) * | 2011-07-18 | 2012-01-18 | 无锡盾建重工制造有限公司 | End cap fixed type double-edge hob with abrasion display function for shield machine |
| CN103411820A (en) * | 2013-08-21 | 2013-11-27 | 王金仓 | Multi-azimuth synchronous load testing machine and control method thereof |
| CN204439355U (en) * | 2015-03-12 | 2015-07-01 | 中国矿业大学(北京) | A kind of rolling bearing radial force charger |
| CN107944174A (en) * | 2017-12-06 | 2018-04-20 | 清华大学 | A kind of roller gear Longitudinal Load Distribution Factors acquisition methods |
Non-Patent Citations (1)
| Title |
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| 王利华: "盾构机刀盘四齿轮并联驱动的载荷均衡性仿真", 《机械传动》 * |
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