CN104406765A - Test method for dynamic lift of automobile wiper and test device thereof - Google Patents
Test method for dynamic lift of automobile wiper and test device thereof Download PDFInfo
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- CN104406765A CN104406765A CN201410669724.5A CN201410669724A CN104406765A CN 104406765 A CN104406765 A CN 104406765A CN 201410669724 A CN201410669724 A CN 201410669724A CN 104406765 A CN104406765 A CN 104406765A
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- wiper
- wind
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Abstract
The invention relates to a test method for dynamic lift of automobile wiper and test device thereof. The test device includes an engine cover model configured to simulate the front of the automobile, a windscreen model configured to simulate the windscreen and install the wiper assembly, a rectangular thin plate configured to support the wiper, a synchronous device used for synchronization of the wiper and the thin plate, and a computer used for data storage and processing. Through the flow field simulation of the automobile wiper in a wind tunnel laboratory using the provided test method and test device, the dynamic pressure of the wiper in the conditions of wind and without wind can be obtained, and the dynamic lift of automobile wiper generated under the influence of wind can be calculated through a formula.
Description
Technical field
The present invention relates to a kind of automobile wiper dynamic lift method of testing and proving installation thereof, achieve the test of wiper aerodynamic lift in the course of the work.The invention belongs to automobile wiper aerodynamics Top-Down Design technical field.
Background technology
Automobile is when the rainy day travels, and wiper is subject to the effect of air-flow, and can produce an aerodynamic lift, when low speed, aerodynamic lift is less, does not affect the normal work of wiper; When high speed, aerodynamic lift increases, and wiper there will be unstable situation, and the wiper usefulness of self is reduced, and causes rainwater wiper unclean, affects the visual field of driver at windscreen, thus affect travel safety.
When the speed of a motor vehicle improves gradually, the high speed pneumatic stability of wiper is not but improved accordingly.At present, for the research of wiper aerodynamic lift, only use only numerical value emulation method, but the result that numerical value emulation method obtains cannot judge its correctness, lacks persuasion.And corresponding experimental study can be complemented each other with numerical simulation, make result of study truer.Owing to there is no corresponding experimental study so far, cause the aerodynamics Top-Down Design of wiper to lack and instruct foundation reliably, so with regard to little aerodynamic characteristic considering wiper from aerodynamic angle.Therefore, the present invention has great importance to wiper aerodynamics Top-Down Design.
Summary of the invention
The object of the invention is the lift during way test wiper motion by test, fill up the blank of current wiper aerodynamics Top-Down Design test method.Technical matters to be solved be how to simulate real vehicle wiper working environment and how to test wiper motion time downforce.
Technical scheme of the present invention is as follows:
This proving installation comprises:
The model (hereinafter bonnet model) of a simulated automotive bonnet,
The model (hereinafter front windshield model) of a simulated automotive front windshield,
The thin plate of a support wiper,
The synchronous device of a wiper and thin plate,
A set of pressure testing system,
The computing machine of Acquire and process data.
The method of test wiper dynamic lift comprises the following steps:
Step one: wiper, thin plate, synchronous device are arranged on front windshield model;
Step 2: the pressure transducer in pressure testing system is fixed between wiper and thin plate;
Step 3: bonnet model and front windshield model are spliced and fix in wind tunnel laboratory;
Step 4: the wind adding certain wind speed in wind-tunnel, makes wiper start working, the downforce of test wiper under the condition having wind, and records data;
Step 5: the wind speed in wind-tunnel is reduced to 0m/s, wiper maintenance work, the downforce of test wiper under calm condition, and record data;
Step 6: by the data recorded in step 4 and step 5, can calculate the dynamic lift of wiper by wind effect generation according to following computing formula.
F
L＝F
P-F
P'
In formula: F
lfor the lift of wiper, unit is ox; F
pfor the total downforce of wiper under calm condition; F
p' there iing the total downforce under wind condition for wiper.
Beneficial effect of the present invention is:
1, this invention can be used for the experimental study of automobile wiper lift, does not have correlation test at present.
2, this invention can realize the test of dynamic lift when automobile wiper works, and does not have relevant test method at present.
3, the wiper lift value order of magnitude is less, and the experimental enviroment of this invention is wind tunnel laboratory, eliminates most of external interference factor.
4, this invention is easy to operate, and test efficiency is high, and all can use different model wiper.
Accompanying drawing explanation
Fig. 1 is automobile wiper dynamic lift proving installation structural drawing;
Fig. 2 is thin plate and synchronous device connection layout;
Fig. 3 is wiper and synchronous device connection layout;
Fig. 4 is the schematic diagram that pressure transducer is arranged on thin plate;
Fig. 5 is wiper, pressure transducer, cushion block and thin plate constitutional diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Proving installation of the present invention and wiper mounting structure figure are see Fig. 1: bonnet model 1, front windshield model 4, thin plate 3, synchronous device 8, pressure testing system 5, computing machine 6, wiper 2, wiper motor 7.
Thin plate 3 is connected by screw 9 with synchronous device 8, as Fig. 2, the rotating shaft of wiper 2 is inserted in the hole of thin plate 3, is then contained on wiper motor 7.Pressure wiper 2, is located at the centre position of thin plate 3.Tightened by screw 12 on synchronous device 8, compress briquetting 11, so that compress wiper 2, wiper 2 is fixedly connected with thin plate 3, and both motion Complete Synchronizations, as Fig. 3.Thin plate 3 requires outline and wiper 2 profile similarity, is conducive to like this reducing thin plate 3 to the impact in wiper 2 surrounding flow field.Thin plate 3 has certain width, to arrange pressure transducer 13, fall the oblique angle of 30 ~ 45 degree at edge, and effect avoids air-flow occur to be separated in the edge of thin plate 3 and form turbulent flow, and then affect the flow field quality around wiper.
3 to 5 pressure transducers 13 are fixed on thin plate 3, guarantee that the pressure-sensitive region of pressure transducer 13 is positioned at immediately below wiper 2, as Fig. 4.Stick certain thickness cushion block 14 in the pressure-sensitive region of pressure transducer 13, effect makes linear contact lay original between wiper 2 and thin plate 3 change over several point cantact, and the region do not contacted and thin plate leave very little gap, as Fig. 5.The output line of pressure transducer 13 is arranged in the rear of wiper 2, smoothing out with the fingers along posting, deriving from the circular hole of rotating shaft along thin plate 3 profile, is conducive to the impact reducing output line stream field like this.
Bonnet model 1 and front windshield model 4 are placed on the correct position in test chamber, guarantee that longitudinal plane of symmetry of two models is parallel with the central plane of test chamber.Add weight to increase its stability in model inside, prevent from because model is unstable, security incident occurring during test.Bonnet model 1 front portion is circular arc, plays guide functions, the string of a musical instrument angle of these two positions of angle reference car of bonnet model 1 rear portion and front windshield model 4 upper surface; The width of model to be grown up about 30cm than the length of wiper 2, guarantees that the surrounding flow field of wiper 2 is close to truth.
Coat lubricant at front windshield model 4 upper surface, guarantee wiper 2 operationally, the friction force between thin plate 3 and front windshield model 4 is as far as possible little, to reduce the vibration produced because of friction.
The measuring method of this measurement mechanism is utilized to comprise the following steps: to connect wiper 2 power supply, make it normally work, at this moment wiper 2, thin plate 3 and pressure transducer 13 synchronous hunting; The wind of certain wind speed will be added, such as 40km/h, 80km/h, 120km/h, to simulate the situation of low speed, middling speed, high speed in wind-tunnel.After stable, the dynamic pressure of each 5 to 10 periods of motion of speed acquisition.Maintain wiper 2 to work, wind speed is reduced to 0, again gathers the dynamic pressure in same number of motion cycle.For a certain pressure transducer 13, each cycle data under above-mentioned a certain speed is carried out the handling averagely during week, obtain this pressure transducer 13 dynamic pressure value in this speed one-period, the data after process can be obtained the dynamic lift value of each speed of wiper 2 by following computing method.
Dynamic lift computing method are as follows: the dynamic pressure recording each pressure transducer 13 when being located at calm is respectively F
1, F
2, F
3..., the dynamic pressure recorded when there being wind is respectively F
1', F
2', F
3' ...Because each pressure transducer 13 Impact direction is all vertical with front windshield model 4 upper surface, general pressure equals the pressure sum of each pressure transducer 13, total downforce F of wiper when the lift of wiper 2 is calm
prelative to total downforce F when having wind
p' knots modification, lift is set to F
l, then
F
P＝(F
1+F
2+F
3+…)
F
P'＝(F
1'+F
2'+F
3'+…)
F
L＝F
P-F
P' 。
Claims (7)
1. a method of testing for automobile wiper dynamic lift, is characterized in that, the method comprises the following steps:
Step one: wiper 2, thin plate 3, synchronous device 8 are arranged on front windshield model 4;
Step 2: the some pressure transducers 13 in pressure testing system 5 are fixed between wiper 2 and thin plate 3;
Step 3: bonnet model 1 and front windshield model 4 are spliced and fix in wind tunnel laboratory;
Step 4: the wind adding certain wind speed in wind-tunnel, makes wiper 2 start working, the dynamic downforce of test wiper 2 under the condition having wind, and records data;
Step 5: the wind speed in wind-tunnel is dropped to 0m/s, wiper 2 maintenance work, the dynamic downforce of test wiper 2 under calm condition, and record data;
Step 6: by the data recorded in step 4 and step 5, can calculate the dynamic lift of wiper by wind effect generation according to following computing formula.
F
L＝F
P-F′
p
In formula: F
lfor the lift of wiper, unit is ox; F
pfor the dynamically total downforce of wiper under calm condition; F '
pfor wiper is having the dynamically total downforce under wind condition.
2. a proving installation for automobile wiper dynamic lift, is characterized in that, this proving installation comprises:
The model (hereinafter bonnet model) of a simulated automotive bonnet,
The model (hereinafter front windshield model) of a simulated automotive front windshield,
The thin plate of a support wiper,
The synchronous device of a wiper and thin plate,
A set of pressure testing system,
The computing machine of Acquire and process data;
3. the proving installation of automobile wiper dynamic lift according to claim 2, is characterized in that: bonnet model 1 is hollow-core construction, and front portion is circular arc, rear portion is plane and has certain angle.
4. the proving installation of automobile wiper dynamic lift according to claim 2, is characterized in that: front windshield model 4 is hollow-core construction, and upper surface is plane and has certain angle; There is a circular hole upper surface left front, and the rotating shaft of wiper 2 can be arranged on the output shaft of wiper motor 7 by circular hole.
5. the proving installation of automobile wiper dynamic lift according to claim 2, is characterized in that: thin plate 3 outline determines there is one fixed width according to wiper 2 outline; Bevelling, edge, for water conservancy diversion, there is circular hole rotating shaft one end, can be enclosed within wiper 2 rotating shaft; Thin plate 3 is connected with synchronous device 8 by screw 9.
6. the proving installation of a kind of automobile wiper dynamic lift according to claim 2, is characterized in that: synchronous device 8 entirety becomes U-shaped, comprises U-shaped body 10, two briquettings 11 and 4 screws 12; Respectively there are two threaded holes U-shaped body 10 both sides, and for cartridge screw 12, screw 12 can compress briquetting 11, and then compress wiper 2.
7. the proving installation of a kind of automobile wiper dynamic lift according to claim 2, is characterized in that: the power delivery mode that thin plate 3, wiper 2, synchronous device 8 and pressure transducer 13 realize being synchronized with the movement---wiper 2---synchronous device 8---thin plate 3---pressure transducer 13 that is wiper motor 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410669724.5A CN104406765B (en) | 2014-11-21 | 2014-11-21 | Test method for dynamic lift of automobile wiper and test device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410669724.5A CN104406765B (en) | 2014-11-21 | 2014-11-21 | Test method for dynamic lift of automobile wiper and test device thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN104406765A true CN104406765A (en) | 2015-03-11 |
| CN104406765B CN104406765B (en) | 2017-02-22 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410669724.5A Expired - Fee Related CN104406765B (en) | 2014-11-21 | 2014-11-21 | Test method for dynamic lift of automobile wiper and test device thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN104406765B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107131995A (en) * | 2017-06-30 | 2017-09-05 | 吉林大学 | A kind of Wiper pressing force distribution air tunnel testing device and wiper control method |
| CN108645594A (en) * | 2018-07-23 | 2018-10-12 | 吉林大学 | A kind of wind tunnel test simplification car model for research of making an uproar for interior wind |
| CN109827741A (en) * | 2018-12-26 | 2019-05-31 | 贵阳万江航空机电有限公司 | A method of detection windscreen wiper product wind tunnel test parameter |
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2014
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107131995A (en) * | 2017-06-30 | 2017-09-05 | 吉林大学 | A kind of Wiper pressing force distribution air tunnel testing device and wiper control method |
| CN108645594A (en) * | 2018-07-23 | 2018-10-12 | 吉林大学 | A kind of wind tunnel test simplification car model for research of making an uproar for interior wind |
| CN109827741A (en) * | 2018-12-26 | 2019-05-31 | 贵阳万江航空机电有限公司 | A method of detection windscreen wiper product wind tunnel test parameter |
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|---|---|
| CN104406765B (en) | 2017-02-22 |
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Granted publication date: 20170222 Termination date: 20211121 |