CN104715104A - Vehicle-mounted air conditioner duct design method based on CAE emulation technique - Google Patents
Vehicle-mounted air conditioner duct design method based on CAE emulation technique Download PDFInfo
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Abstract
The invention provides a vehicle-mounted air conditioner duct design method based on CAE emulation technique. The method comprises a modeling procedure, an emulation analysis procedure, an air distribution and judgment procedure and an optimization procedure, wherein the optimization procedure means that one or more of multiple air duct optimization ways are adopted selectively to conduct optimization to an air duct three-dimensional model, the multiple air duct optimization ways comprise the steps of changing bending angles at one or more positions of one or more divergent air ducts; changing the cross sections at the one or more positions of the one or more divergent air ducts; arranging stream guidance structures used for reducing flow or draining flow at the upstream of air duct forks of the one or more divergent air ducts. By means of the design method, the problems that in the prior art, the cycle is long and the cost is high in the classified optimization of vehicle-mounted air conditioner ducts are effectively solved.
Description
Technical field
The present invention relates to technical field of automobile design, particularly relate to the method for designing in the on-board air conditioner air channel based on CAE emulation technology.
Background technology
On-board air conditioner, closely bound up with occupant's comfortableness, being responsible for the various functions such as car interior defrosting, heating, cooling, ventilation, is one of important indicator evaluating comfortableness.
1, the air quantity in forward position optimizes intention.
Promote occupant's comfortableness, primary is heavily the performance promoting air-conditioning.Air channel, as on-board air conditioner important component part, is difficult to once design and puts in place, in the design production run of reality, there is the situation of indivedual tuyere air volume not even air-out less than normal.Under getting rid of the prerequisite of air-conditioner host deficiency in draught, nowadays scientific and technological high speed development, can by the air output installing expensive sensor additional, grid automatic control system carrys out the several air outlet of uniform distribution, as mentioned air volume test device, controller and air-supply module in patent " volume adjusting apparatus and method " (CN201110127728.7), the air quantity of front end, air channel is detected by air volume test device, control module of blowing after transferring to controller analysis, but there is the too high problem of cost in these class methods.
2, traditional air quantity optimizes intention.
If there is allocation of the amount of air inequality in traditional Duct design process, prong cross section is divided mainly through change pipeline rout and air channel, the degree changed structural member is larger, what have even must redesign, substantially prolongs the R&D cycle, and consider general arrangement and process costs, a lot of prioritization scheme is difficult to specifically implement in Duct design, and the air channel of final design is more difficult reaches desirable allocation of the amount of air.Therefore idea and the intention in the adjustable air channel of many air quantity has been expedited the emergence of, more representative as " a kind of air passage distribution box being applicable to multiple allocation of the amount of air ratio " (CN201220439694.5), fair water fin is provided with between adjacent two air outs, and regulating orifice plate is set at prong place, air channel, this regulating orifice plate has multiple adjustment hole, by setting up regulating orifice plate at air vent position, the requirement of various distribution ratio can be met easily by the porosity testing regulating orifice plate, and without the need to designing the air passage distribution box of different subjects structure.
But above-mentioned traditional air quantity optimization method existing problems, namely early stage, design needed validation trial, and its cycle is long and cost is high.
Summary of the invention
An object of the present invention is the method for designing that a kind of on-board air conditioner air channel based on CAE emulation technology will be provided, to solve in prior art for there is the cycle long and problem that cost is high in the Classified optimization in on-board air conditioner air channel.
The invention provides a kind of method for designing of the on-board air conditioner air channel based on CAE emulation technology, comprise: modeling procedure: utilize 3 d modeling software that air channel three-dimensional model is built up in the on-board air conditioner air channel of primary design, described on-board air conditioner air channel is configured to have multiple bifurcated air channel, and bifurcated air channel described in each has corresponding air outlet; Simulation analysis step: carry out CAE simulation analysis to described air channel three-dimensional model, obtains the air flow method of air-flow in the vehicle-mounted air channel of described primary design; Allocation of the amount of air determining step: according to the described air flow method obtained by described CAE simulation analysis, judges whether the air output of air outlet described in each is in corresponding preset range; Optimization Steps: when the described air output of arbitrary described air outlet is not in corresponding described preset range, one or more optionally adopting in the optimal way of multiple air channel are optimized described air channel three-dimensional model, and be back to described simulation analysis step described CAE simulation analysis is carried out, until judge that in described allocation of the amount of air determining step the air output of air outlet described in each is in corresponding described preset range to the described air channel three-dimensional model after optimizing; Wherein, described multiple air channel optimal way comprises: the bending angle changing at least one position in bifurcated air channel described at least one; Change the cross-sectional area of at least one position in bifurcated air channel described at least one; And the upstream end at the fork, air channel in bifurcated air channel arranges the flow-guiding structure being used for choked flow or drainage described at least one.
Further, described flow-guiding structure comprise following one or more: the baffle being arranged on fork, the air channel place in adjacent two bifurcated air channels; Be arranged on the open-celled structure at fork, the air channel place in adjacent two bifurcated air channels, described open-celled structure has air vent, and described open-celled structure is used for the air output according to distributing the different described bifurcated air channel of adjustment.
Further, in described Optimization Steps, comprise one or more steps following: change the shape of described baffle or volume or position; Change the aperture of air vent and the quantity of air vent of open-celled structure.
Further, described open-celled structure is positioned at the air inlet in described adjacent two bifurcated air channels, and makes air-flow enter into two different bifurcated air channels by means of only described air vent.
Further, method for designing also comprises model derives step: derived by the structured data of the air channel three-dimensional model in preset range corresponding for the air output of air outlet described in each; If be provided with flow-guiding structure at described Optimization Steps, three-dimensional model derived type structure data together with the three-dimensional model of air channel of flow-guiding structure will be had.
Apply the method for designing in the on-board air conditioner air channel based on CAE emulation technology of the present invention, the defect on design phase just energy Timeliness coverage Duct design, avoids production and the experiment of inefficacy product, reduces production, experimentation cost to greatest extent.And more can find defect cause intuitively, optimizing product root, effectively realize component in each air channel and distribute, both significantly shortened the R&D cycle, and reduced design cost, stopped again later product and scrapped.Meet nowadays on production line fast, the requirement of efficient, low energy consumption.
According to hereafter by reference to the accompanying drawings to the detailed description of the specific embodiment of the invention, those skilled in the art will understand above-mentioned and other objects, advantage and feature of the present invention more.
Accompanying drawing explanation
Hereinafter describe specific embodiments more of the present invention with reference to the accompanying drawings by way of example, and not by way of limitation in detail.Reference numeral identical in accompanying drawing denotes same or similar parts or part.It should be appreciated by those skilled in the art that these accompanying drawings may not be drawn in proportion.In accompanying drawing:
Fig. 1 is according to an embodiment of the invention based on the schematic diagram of the method for designing in the on-board air conditioner air channel of CAE emulation technology;
Fig. 2 is the schematic diagram based on the Optimization Steps S41 of the method for designing in the on-board air conditioner air channel of CAE emulation technology shown in Fig. 1;
Fig. 3 is the structural representation of the air channel three-dimensional model of 3 d modeling software primary design;
Fig. 4 is the structural representation adding baffle in Optimization Steps in the three-dimensional model of air channel;
Fig. 5 is the part-structure schematic diagram adding open-celled structure in Optimization Steps in the three-dimensional model of air channel;
Fig. 6 is the structural representation in another direction of the open-celled structure shown in Fig. 5;
Fig. 7 is the air output comparison diagram of each air outlet before and after the optimization that draws of CAE simulation analysis.
Embodiment
Fig. 1 is according to an embodiment of the invention based on the schematic diagram of the method for designing in the on-board air conditioner air channel of CAE emulation technology.Composition graphs 1 and Fig. 2, the method for designing in the on-board air conditioner air channel based on CAE emulation technology of the present embodiment, comprises the following steps:
Modeling procedure S10: utilize 3 d modeling software that air channel three-dimensional model is built up in the on-board air conditioner air channel of primary design, on-board air conditioner air channel is configured to have multiple bifurcated air channel, and each bifurcated air channel has corresponding air outlet;
Simulation analysis step S20: carry out CAE simulation analysis to air channel three-dimensional model, obtains the air flow method of air-flow in the vehicle-mounted air channel of primary design;
Allocation of the amount of air determining step S30: according to the air flow method obtained by CAE simulation analysis, judges whether the air output of each air outlet is in corresponding preset range;
Optimization Steps S41: when the air output of arbitrary air outlet is not in corresponding preset range, one or more optionally adopting in the optimal way of multiple air channel are optimized air channel three-dimensional model, and be back to simulation analysis step CAE simulation analysis is carried out, until judge that in allocation of the amount of air determining step the air output of each air outlet is in corresponding preset range to the air channel three-dimensional model after optimizing.The selection of preset range is according to the topological design of concrete on-board air conditioner, and generally, the air output of each air outlet is the mean value that the total intake of on-board air conditioner airduct draws divided by air outlet quantity.
Wherein, multiple air channel optimal way comprises:
S413: the bending angle changing at least one position at least one bifurcated air channel;
S415: the cross-sectional area changing at least one position at least one bifurcated air channel; And
S417: the upstream end at the fork, air channel at least one bifurcated air channel arranges the flow-guiding structure being used for choked flow or drainage.
By to after the CAE simulation analysis of air channel three-dimensional model, the air flow method in air channel and the pressure distribution in air channel can be obtained, in conjunction with hydrodynamic characteristics, the position causing allocation of the amount of air irrational mix, structure place can be found in air channel accurately.The allocation of the amount of air such as first obtaining certain air-conditioning duct by cae analysis does not meet designing requirement, there is one or more air outlet air quantity excessive and rise with air outlet air quantity too small, so according to after the pressure distribution in air flow method in the air channel of analysis result acquisition and air channel, in conjunction with hydrodynamic characteristics, select to settle flow-guiding structure in the distance range of distance fork, air channel air-flow upstream design permission, and according to the processing technology of perforate, the process such as machining deformation or adjustment position is carried out to flow-guiding structure, and again verified by simulation analysis, this flow-guiding structure is finally made to stop or drainage the air-flow flowed through, reach the effect of air flow method in adjustment air channel, and then make allocation of the amount of air meet the object of designing requirement.
Apply the method for designing in the on-board air conditioner air channel based on CAE emulation technology of the present invention, the defect on design phase just energy Timeliness coverage Duct design, avoids production and the experiment of inefficacy product, reduces production, experimentation cost to greatest extent.And more can find defect cause intuitively, optimizing product root, effectively realize component in each air channel and distribute, both significantly shortened the R&D cycle, and reduced design cost, stopped again later product and scrapped.Meet nowadays on production line fast, the requirement of efficient, low energy consumption.
It should be noted that, in the optimal way of multiple air channel, the bending angle in step S413 for a change each bifurcated air channel, the aperture at step S415 for a change each diverse location place, bifurcated air channel, these two kinds of modes of step S413 and step S415 are all the three-dimensional models changing air channel, have modified to optimize improvement to the modeling parameters of air channel three-dimensional model.But because step S413 and step S415 modifies to air channel three-dimensional model, when revising three-dimensional model, need entirety to modify to three-dimensional model, its workload is very large, and the time that Optimization Steps needs is longer.Simultaneously, on-board air conditioner installed by some automobiles, automobile is that the installing space of vehicle-mounted retention is more fixing, amendment limited space, so the allowed band of directly modifying for air channel three-dimensional model is smaller, constantly finely tuning in the process of air channel three-dimensional model, its effectiveness comparison optimized is not obvious.Have certain disadvantages based on above-mentioned step S413 and step S415, in the selection course of air channel optimal way, the obvious step S417 of Selection effect as far as possible, the flow-guiding structure self structure arranged is fairly simple, carries out three-dimensional modeling and saves time, and regulate particular location also more convenient, relative to step S413 and step S415, step S417 adds optimization efficiency, saves the time of revising whole air channel structure, greatly reduces the workload of amendment three-dimensional modeling.
In conjunction with concrete air channel structure, explaination explanation is carried out to the method for designing of above-described embodiment, see Fig. 3, show air channel three-dimensional model, this air channel model has on-board air conditioner airduct 10, first air outlet a, second air outlet b, 3rd air outlet c, 4th air outlet d, 3rd air outlet c and the 4th air outlet d distinguishes correspondence bifurcated air channel e2 and bifurcated air channel e1, its each air outlet air quantity of air channel three-dimensional model shown in Fig. 3 is see Fig. 7, this air channel three-dimensional model shows through CAE simulation analysis in design early stage, its air outlet a, b, c, the original state air quantity percent difference of d is apart from larger, do not meet design requirement.
Following two kinds of structures are comprised at above-mentioned flow-guiding structure 20, wherein a kind of structure can be selected according to specific circumstances, or two kinds of flow-guiding structures 20 use to carry out air output and change simultaneously, specifically comprise: the baffle one, being arranged on fork, the air channel place in adjacent two bifurcated air channels, present embodiments provide a kind of schematic diagram being arranged on the baffle at fork, the air channel place in adjacent two bifurcated air channels, see Fig. 4.Two, be arranged on the open-celled structure at fork, the air channel place in adjacent two bifurcated air channels, open-celled structure has air vent 21, and open-celled structure is used for the air output according to distributing the different bifurcated air channel of adjustment, see Fig. 5 and Fig. 6.
See Fig. 4, in the optimal way of air channel, select S417 to be optimized, and the air channel structure of flow-guiding structure 20 choice for use baffle, this baffle is arranged on fork, the air channel place in bifurcated air channel e2 and adjacent bifurcated air channel thereof, to carry out water conservancy diversion to air-flow, and then regulate the air output of the 3rd air outlet c, and the air channel three-dimensional model shown in Fig. 3, select and used the baffle shown in Fig. 4 to be optimized.
As shown in Figure 7, the air output number percent of each air outlet under the original state of different colours corresponding air channel three-dimensional model, increase the air output number percent of each air outlet of flow-guiding structure and reach the air output number percent of each air outlet of target.As can be seen from Figure 7, the air output of the 3rd air outlet c compares the air quantity major general nearly 15% of intended target, and after being optimized by flow-guiding structure 20 (baffle), the air output of the 3rd air outlet c obtains and effectively increases, and the air output of the first air outlet a, the second air outlet b, the 3rd air outlet c, the 4th air outlet d is all reached in preset range.Carrying out in the process regulated at adjustment baffle, by changing the shape of baffle or volume or position, progressively improving the air output of the 3rd air outlet c, until the air output of the 3rd air outlet c reaches preset range.
In other examples, because the structure of open-celled structure is simple, the workload of three-dimensional modeling is little, and its effect is more remarkable, so the preferential open-celled structure that uses carries out adjustment optimization in Optimization Steps, and in the method for the present embodiment, provide a kind of mode directly distributing air quantity, be arranged on the air inlet in adjacent two bifurcated air channels by open-celled structure, and make air-flow enter into two different bifurcated air channels by means of only air vent.Be specifically position and the schematic forms of open-celled structure see the flow-guiding structure 20 shown in Fig. 5 and Fig. 6, can find out as shown in Figure 5, this open-celled structure is directly fixedly installed on the fork place in adjacent two bifurcated air channels and is close to air channel inwall, from the air-flow that upstream, fork enters, through the distribution water conservancy diversion of flow-guiding structure 20 (i.e. open-celled structure), to enter into the first air outlet a, the second air outlet b.Figure 6 shows that the schematic diagram of open-celled structure, wherein the distribution of air vent 21 adjusts according to the concrete needs regulated, generally, the air-flow throughput of the side that air vent 21 quantity is many is larger, but, due to the impact such as gas flow characteristic, pressure distribution, CAE is also still needed to carry out emulating and just can learn that air vent arranges rear air output and how to change.If have employed step S417 at Optimization Steps S41, and select open-celled structure, so in the process that open-celled structure is regulated, the aperture of air vent 21 and the quantity of air vent 21 of open-celled structure can have been changed, to reach predetermined effect.
As shown in Figure 1, the method for designing of the present embodiment also comprises model derives step S42:
The structured data of the air channel three-dimensional model in preset range corresponding for the air output of each air outlet is derived.It should be noted that, if be provided with flow-guiding structure at Optimization Steps, three-dimensional model with air channel three-dimensional model together with the derived type structure data of flow-guiding structure to be had.In actual production process, flow-guiding structure makes simultaneously and is fixed in the middle of air channel, if necessary, can by flow-guiding structure and air channel one-body molded.The air output that directly can reach each air outlet due to CAE simulation analysis is in preset range, so can directly flow-guiding structure be fixed, compared to prior art, the design's method can make air channel structure more firm, even if by the phenomenon such as collision, shake to a certain extent, flow-guiding structure also can not be moved, and adds its reliability, and this is also the method for designing advantage compared to existing technology in the on-board air conditioner air channel based on CAE emulation technology.
So far, those skilled in the art will recognize that, although multiple exemplary embodiment of the present invention is illustrate and described herein detailed, but, without departing from the spirit and scope of the present invention, still can directly determine or derive other modification many or amendment of meeting the principle of the invention according to content disclosed by the invention.Therefore, scope of the present invention should be understood and regard as and cover all these other modification or amendments.
Claims (5)
1., based on the method for designing in the on-board air conditioner air channel of CAE emulation technology, comprising:
Modeling procedure: utilize 3 d modeling software that air channel three-dimensional model is built up in the on-board air conditioner air channel of primary design, described on-board air conditioner air channel is configured to have multiple bifurcated air channel, and bifurcated air channel described in each has corresponding air outlet;
Simulation analysis step: carry out CAE simulation analysis to described air channel three-dimensional model, obtains the air flow method of air-flow in the vehicle-mounted air channel of described primary design;
Allocation of the amount of air determining step: according to the described air flow method obtained by described CAE simulation analysis, judges whether the air output of air outlet described in each is in corresponding preset range;
Optimization Steps: when the described air output of arbitrary described air outlet is not in corresponding described preset range, one or more optionally adopting in the optimal way of multiple air channel are optimized described air channel three-dimensional model, and be back to described simulation analysis step described CAE simulation analysis is carried out, until judge that in described allocation of the amount of air determining step the air output of air outlet described in each is in corresponding described preset range to the described air channel three-dimensional model after optimizing;
Wherein, described multiple air channel optimal way comprises:
Change the bending angle of at least one position in bifurcated air channel described at least one;
Change the cross-sectional area of at least one position in bifurcated air channel described at least one; And
Described at least one, the upstream end at the fork, air channel in bifurcated air channel arranges the flow-guiding structure being used for choked flow or drainage.
2. method for designing according to claim 1, is characterized in that, described flow-guiding structure comprise following one or more:
Be arranged on the baffle at fork, the air channel place in adjacent two bifurcated air channels;
Be arranged on the open-celled structure at fork, the air channel place in adjacent two bifurcated air channels, described open-celled structure has air vent, and described open-celled structure is used for the air output according to distributing the different described bifurcated air channel of adjustment.
3. method for designing according to claim 2, is characterized in that, in described Optimization Steps, comprises one or more steps following:
Change the shape of described baffle or volume or position;
Change the aperture of air vent and the quantity of air vent of open-celled structure.
4. the method for designing according to Claims 2 or 3, is characterized in that, described open-celled structure is positioned at the air inlet in described adjacent two bifurcated air channels, and makes air-flow enter into two different bifurcated air channels by means of only described air vent.
5. method for designing according to any one of claim 1 to 4, is characterized in that, also comprising model derives step:
The structured data of the air channel three-dimensional model in preset range corresponding for the air output of air outlet described in each is derived;
If be provided with flow-guiding structure at described Optimization Steps, three-dimensional model derived type structure data together with the three-dimensional model of air channel of flow-guiding structure will be had.
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