CN104462731A - Method for designing sinusoidal corrugated energy absorption tube - Google Patents
Method for designing sinusoidal corrugated energy absorption tube Download PDFInfo
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- CN104462731A CN104462731A CN201510005819.1A CN201510005819A CN104462731A CN 104462731 A CN104462731 A CN 104462731A CN 201510005819 A CN201510005819 A CN 201510005819A CN 104462731 A CN104462731 A CN 104462731A
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Abstract
The invention discloses a sinusoidal corrugated energy absorption tube. On the basis of a round tube, the wave form of the axial direction of the sinusoidal corrugated energy absorption tube is controlled through the primary function that y=d/2+Asin(omega x + phi), wherein d is the basic diameter, A is the amplitude of the wave form, omega is the angular speed of the wave form, phi is the starting phase angle of the wave form, and the wave length is 2*pi/omega. The creasing mode of the sinusoidal corrugated energy absorption tube is guided through sinusoidal waves, conquassation is predictable, creases are denser and more regular, starting peak force is reduced, and energy absorption safety of the sinusoidal corrugated energy absorption tube is improved. Meanwhile, the step-by-step conquassation principle is adopted, the ratio between the amplitude and the wave length of a buffer area and the ratio between the amplitude and the wave length of an energy absorption area are controlled, peak force is reduced, the utilization rate of materials is increased, and the energy absorption effect is improved.
Description
Technical field
The invention belongs to vehicle passive safety technical field, be specifically related to a kind of sinusoid ripple energy absorbing tube.
Background technology
Along with the fast development of China's economy, domestic automobile recoverable amount increases sharply, and result also in a large amount of traffic hazards simultaneously.Three large themes of current auto industry are: safety, energy-saving and environmental protection, the attention rate of consumer to automotive safety is more and more higher, and directly affects its consumer behavior.Improve vehicle safety performance most important, and vehicle passive safety technology is an extremely important ring of automotive safety technology, has important reality and economic implications.
Bumper is as the important energy absorbing component of automobile, and the energy-absorption box being distributed in bumper two ends is its main endergonic structure.Energy-absorption box is formed primarily of the different thin metallic tubd of structure, and many researchists are by improving its energy absorption characteristics to the structure optimization of thin metallic tubd and optimization of material.This respect also discloses a large amount of patents, and the patent that name is called " a kind of bionical energy absorbing tube of imitative bamboo structure ", by copying the radial direction of bamboo, axial structure, utilizes Optimal Structure Designing to go out a novel energy absorbing tube; Name is called that the patent of " a kind of vehicle energy absorption box " by arranging specific energy-absorbing groove outside round tube, and filled polypropylene foam, improve its energy absorption characteristics; Name is called that the patent of " a kind of crease type crash energy absorption box " guides distorted pattern by folding line lines, thus increases energy absorption.
These existing endergonic structures above, on the one hand, can not realize the control to fold pattern during conquassation and prediction, there is a lot of uncertainties, and this will be a kind of potential safety hazard when colliding and occurring; On the other hand, complicated to the technics comparing arranging induction groove or folding line, substantially increase processing cost and the production time of device.In order to solve the deficiency of above two aspects, propose a kind of novel sinusoid ripple energy absorbing tube.
Summary of the invention
The object of this invention is to provide a kind of sinusoid ripple energy absorbing tube and method for designing, this device has closeer more regular conquassation wrinkle pattern, can realize the design in advance to wrinkle pattern and control, reduces initial spike power simultaneously.This energy absorption device mainly applies in the energy-absorption box of bumper, improves the passive safety of automobile.
The technical solution adopted in the present invention provides a kind of sinusoid ripple energy absorbing tube method for designing, it is characterized in that:
Step 1, the axial length L determining sinusoid ripple energy absorbing tube and basic diameter d;
Step 2, utilize basis function
the profile of offset of sinusoidal formula ripple energy absorbing tube carries out Parameter analysis; Wherein, A is the amplitude of waveform, and ω is the angular velocity of waveform, can show that wavelength is by angular velocity
for the starting phase angle of waveform, unit is International System of Units;
Step 3, carry out Parameters of Finite Element emulation, analyze the initial spike power of sinusoid corrugated tube, the fluctuation degree than energy-absorbing, total energy-absorbing and load under different parameters;
Step 4, simulation performance is carried out to circular straighttube and sinusoid corrugated tube compare;
Step 5, determine the wavelength m of buffer zone and the combination of amplitude according to emulated data and comparative result;
Step 6, according to emulated data and the wavelength n in comparative result determination energy-absorbing district and the combination of amplitude;
The basis function simulation process of step 7, repetition above-mentioned steps 3-6;
Step 8, finally determine basis function
the parameters of middle correspondence, and process according to the basis function offset of sinusoidal formula ripple energy absorbing tube after determining.
Beneficial effect of the present invention
Compare with energy-absorption box in the past, the present invention has the following advantages:
1, basis function is utilized
realize the controlled processing to cast.
2, guide its wrinkle pattern by sinusoid ripple, conquassation pattern can be predicted, and wrinkle are closeer more regular.Sinusoidal ripple struction is equivalent to and carries out pre-treatment to pipe, reduces initial spike power, improves the security of its energy-absorbing.
3, just can be realized the control of wrinkle pattern by simple processing and manufacturing, greatly save production cost.
4, adopt the principle of conquassation step by step, control buffer zone and the amplitude in energy-absorbing district and the ratio of wavelength, play reduction peak force, improve the utilization factor of material simultaneously, thus improve its energy-absorbing effect.
5, in processing technology, the technique of corrugated tube hydroforming of the present invention is processed, this needs the pre-designed mould of corrugated tube basis function according to designing, disposablely to shape, greatly reduce follow-up repairing and be apt to processing, its material utilized is the good metal aluminum alloy of plasticity simultaneously, also can attempt on some compound substances.
Accompanying drawing explanation
Fig. 1 is the physical dimension schematic diagram of sinusoid corrugated tube;
Fig. 2 is amplitude A and the conquassation distorted pattern point diagram mated of wavelength.
Embodiment
Below in conjunction with accompanying drawing 1-2, the present invention is described in detail.
Fig. 1 is the physical dimension schematic diagram of sinusoid corrugated tube, and the L in figure is the overall length of sinusoid corrugated tube of the present invention, and l is the length of described corrugated tube buffer zone, and d is the basic diameter of sinusoid corrugated tube, and m is the wavelength of buffer zone, and n is the wavelength in energy-absorbing district.
Concrete, pass through
control the profile of corrugated tube, A is the amplitude of waveform, and ω is the angular velocity of waveform, can show that wavelength is by angular velocity
for the starting phase angle of waveform, larger on the impact of initial spike power.
Can obviously find out in Fig. 1, the wavelength of the buffer zone of upper end is less than the wavelength in energy-absorbing district, lower end, the object of such design is, the buffer zone of upper end is first allowed to carry out conquassation, reach and reduce the effect of peak force, energy-absorbing district after buffer zone conquassation terminates, can be guided to carry out conquassation, and ensure safety in advance under, by changing the wavelength in energy-absorbing district, improve mean force to greatest extent.
In addition, by controlling buffer zone and the amplitude in energy-absorbing district and the ratio of wavelength, playing reduction peak force, improving the utilization factor of material simultaneously, thus improving its energy-absorbing effect.Meanwhile, the conquassation fold pattern of sinusoid corrugated tube is more closely knit than straight tube, rule more, can arrive the control to fold pattern during conquassation by design in advance, thus causes uncertain failure mode in minimizing collision energy-absorbing process, avoids potential safety hazard.
The present invention proposes a kind of sinusoid ripple energy absorbing tube method for designing.
Step 1, the axial length L determining sinusoid ripple energy absorbing tube and basic diameter d;
Concrete, axial length L and the basic diameter d of sinusoid corrugated tube are determined by installation site, get L=200mm, d=60mm in embodiment;
Step 2, utilize basis function
parameter analysis is carried out to the profile of pipe;
Wherein, A is the amplitude of waveform, and ω is the angular velocity of waveform, can show that wavelength is by angular velocity
for the starting phase angle of waveform, unit is International System of Units.
Step 3, carry out Parameters of Finite Element emulation, analyze the initial spike power of sinusoid corrugated tube, the fluctuation degree than energy-absorbing, total energy-absorbing and load under different parameters;
In the process of design sinusoid corrugated tube of the present invention, need to have been tested by finite element simulation, wherein, the true optimum configurations in finite element side is as follows:
The material that sinusoid corrugated tube tube wall adopts is aluminium alloy 6063T6, and its density is 2.7g/mm*3, and elastic modulus is 65GPa, and Poisson ratio is 0.3, and yield strength is 130MPa.Emulate in hypermesh software, select No. 24 material models.Rigid wall carries out conquassation with the constant speed of 2m/s, and in calculating, pipe adopts single surface contact, and static friction factor is 0.3, and dynamic friction factor is 0.2.Pipe adopts surface to surface to contact with bottom rigidity wall simultaneously, and static friction factor and dynamic friction factor are respectively 0.3 and 0.2.
The optimum configurations of sinusoid corrugated tube in table 1 emulation experiment
From in table 1: the basic diameter d of corrugated tube is 60mm, and thickness t is 1mm, the overall length L of pipe is 200mm, and buffer length l is 40mm, and energy-absorbing section length m is 160mm; The wavelength of buffer zone is 4mm, the wavelength in energy-absorbing district is 4 as shown in Table 2,6,8,10,12,15,16,18,20, wavelength that 30mm these ten groups is different.Amplitude A is 1mm.
The initial spike power that table 2 emulates and the correlation data than energy-absorbing:
| Numbering | SEA(KJ/kg) | Peak force (KN) |
| 1 | 10.903 | 15.367 |
| 2 | 11.263 | 14.006 |
| 3 | 12.507 | 12.721 |
| 4 | 11.490 | 11.216 |
| 5 | 10.227 | 12.621 |
| 6 | 9.744 | 12.509 |
| 7 | 9.880 | 13.856 |
| 8 | 9.881 | 11.604 |
| 9 | 9.746 | 15.544 |
| 10 | 8.442 | 19.892 |
| 11 | 13.472 | 31.059 |
Data display in table 2, compare with the initial spike power 31.059KN of straight tube, corrugated tube advantage in this respect has obvious advantage, but decreases than energy-absorbing.Both balances, minimum than under the condition of energy-absorbing at sacrifice, when energy-absorbing district wavelength is 8mm, this corrugated tube can as a kind of desirable energy-absorption box.
Can obtain further, the power displacement curve fluctuation of straight tube is violent, and this should reduce and be avoided in car crass endergonic process, and corrugated tube shows sizable advantage in this respect, and its load is relatively uniform stable.
Step 4, simulation performance is carried out to circular straighttube and sinusoid corrugated tube compare;
Concrete, as A=0, corrugated tube just changes the round straight tube that diameter is d into, compares its energy absorption characteristics parameter: the fluctuation degree of initial spike power, SEA (than energy-absorbing), SE (total energy-absorbing), deformation pattern and load; The energy-absorbing value of straight tube is better than corrugated tube, but its deficiency to be distorted pattern wayward, initial spike power is large, load fluctuation is large, and the advantage of these corrugated tubes just, deformation pattern is stable, initial spike power is less meeting, and improves the energy-absorbing value of corrugated tube in the stable situation of load as far as possible.
Step 5, determine the wavelength m of buffer zone and the combination of amplitude according to emulated data and comparative result;
Step 6, according to emulated data and the wavelength n in comparative result determination energy-absorbing district and the combination of amplitude;
Concrete, will straight tube be tending towards because wavelength value is large, therefore wavelength simulation scale be 4,6,8,10,12,15,16,18,20,30mm; Cross young pathbreaker due to amplitude and be tending towards straight tube, amplitude is crossed senior general and is significantly reduced its energy-absorbing value, thus amplitude range be 0.2,0.4,0.6,0.8,1.0,1.2,1.4,1.6,1.8,2.0mm.Wavelength and amplitude are carried out random combine simulation analysis in scope class.
Concrete, because initial spike power appeared in the very short time after colliding, the time of considering is difficult to hold, and determine that buffer length is 1/5th of pipe axial length L, energy-absorbing section length is 4/5ths of pipe axial length;
The emulation experiment of step 7, repeating group function;
Concrete, this is the process of an optimizing, under the prerequisite controlling its generation accordion conquassation pattern, is target to the maximum, seeks the combination of optimal wavelength and amplitude with SEA.
Concrete, amplitude mates conquassation deformation pattern as shown in Figure 2 with wavelength, and we can draw, concertina format is a region, seeks best parameter matching in this region and is the basis function parameter finally obtained.
Step 8, finally determine basis function
the parameters of middle correspondence, and process according to the basis function offset of sinusoidal formula ripple energy absorbing tube after determining.
Further, the processing mode of this corrugated tube adopts the technique of disposable liquid pressing formation, and this requires the pre-designed model consistent in sinusoid corrugated tube profile, and the impulsive force powerful by hydroforming and the preferably profile of uniform stressed to pipe are processed.Obviously can reduce the repairerment technique of sharp processing like this, greatly reduce production cost.
It is pointed out that the above, be only specific embodiment of the invention example, the data used in example and chart are only for illustration of the concrete thought of this method.For a person skilled in the art, within the spirit and principles in the present invention all, the change that can expect easily or equal replacement, improvement etc., all should be included within protection scope of the present invention.Therefore, protection scope of the present invention should with the protection domain of described claim.
Claims (2)
1. a method for designing for sinusoid ripple energy absorbing tube, is characterized in that:
Step 1, the axial length L determining sinusoid ripple energy absorbing tube and basic diameter basis diameter d;
Step 2, utilize basis function
the profile of offset of sinusoidal formula ripple energy absorbing tube carries out Parameter analysis; Wherein, A is the amplitude of waveform, and ω is the angular velocity of waveform, can show that wavelength is by angular velocity
for the starting phase angle of waveform, unit is International System of Units;
Step 3, carry out Parameters of Finite Element emulation, analyze the initial spike power of sinusoid corrugated tube, the fluctuation degree than energy-absorbing, total energy-absorbing and load under different parameters;
Step 4, simulation performance is carried out to circular straighttube and sinusoid corrugated tube compare;
Step 5, determine the wavelength m of buffer zone and the combination of amplitude according to emulated data and comparative result;
Step 6, according to emulated data and the wavelength n in comparative result determination energy-absorbing district and the combination of amplitude;
The basis function simulation process of step 7, repetition above-mentioned steps 3-6;
Step 8, finally determine basis function
the parameters of middle correspondence, and process according to the basis function offset of sinusoidal formula ripple energy absorbing tube after determining.
2. the method for designing of sinusoid ripple energy absorbing tube according to claim 1, is characterized in that: the axial length L=200mm of sinusoid corrugated tube, basic diameter d=60mm.
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Cited By (7)
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| CN105787222A (en) * | 2016-04-28 | 2016-07-20 | 湖南大学 | Design method of multi-cell thin-wall energy absorbing pipe |
| CN105863696A (en) * | 2016-05-17 | 2016-08-17 | 太原理工大学 | Corrugated anchored rod device high in strength and large in deformation |
| CN106347463A (en) * | 2016-10-17 | 2017-01-25 | 东南大学 | Bionic energy absorption box |
| CN106379263A (en) * | 2016-10-17 | 2017-02-08 | 东南大学 | Damping structure for vehicle bumper |
| CN108944761A (en) * | 2018-08-21 | 2018-12-07 | 苏州达美特汽车技术有限公司 | A kind of vehicle energy absorption box and automobile |
| CN110450810A (en) * | 2019-08-13 | 2019-11-15 | 中南大学 | A kind of corrugated composite endergonic device and the rail vehicle with the device |
| CN110532679A (en) * | 2019-08-28 | 2019-12-03 | 中国科学院力学研究所 | It is a kind of for impacting the helical fissure pipe and its Automation Design method of energy-absorbing |
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| CN109624900B (en) * | 2018-12-14 | 2021-10-01 | 华侨大学 | Automobile collision energy absorption box |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105787222A (en) * | 2016-04-28 | 2016-07-20 | 湖南大学 | Design method of multi-cell thin-wall energy absorbing pipe |
| CN105787222B (en) * | 2016-04-28 | 2019-05-17 | 湖南大学 | A kind of design method of more born of the same parents' thin-walled energy absorbing tubes |
| CN105863696A (en) * | 2016-05-17 | 2016-08-17 | 太原理工大学 | Corrugated anchored rod device high in strength and large in deformation |
| CN106347463A (en) * | 2016-10-17 | 2017-01-25 | 东南大学 | Bionic energy absorption box |
| CN106379263A (en) * | 2016-10-17 | 2017-02-08 | 东南大学 | Damping structure for vehicle bumper |
| CN108944761A (en) * | 2018-08-21 | 2018-12-07 | 苏州达美特汽车技术有限公司 | A kind of vehicle energy absorption box and automobile |
| CN110450810A (en) * | 2019-08-13 | 2019-11-15 | 中南大学 | A kind of corrugated composite endergonic device and the rail vehicle with the device |
| CN110532679A (en) * | 2019-08-28 | 2019-12-03 | 中国科学院力学研究所 | It is a kind of for impacting the helical fissure pipe and its Automation Design method of energy-absorbing |
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