CN113820001B - Experimental device for testing wiper and windshield friction vibration noise - Google Patents

Abstract

The invention relates to an experimental device for testing frictional vibration noise of wipers and windscreens. Including the test bench, the cross drive part, the one-way force sensor and the wiper assembly; the windshield glass is installed in the test bench, the cross drive part is installed on the test bench, and its movable end can move longitudinally and laterally respectively; the wiper One end of the assembly is installed on the movable end of the cross drive part through two unidirectional force sensors, one unidirectional force sensor is arranged along the longitudinal direction, and the other unidirectional force sensor is arranged along the transverse direction. The above-mentioned experimental device for testing the frictional vibration noise of the wiper and windshield connects the cross drive part and the wiper assembly through two unidirectional force sensors arranged perpendicular to each other. The operating status of the wiper blade can be applied to the windshield glass in different sizes, so as to measure the normal force and friction force of the wiper blade against the glass during the wiping process, and the measurement is more accurate.

Description

Experimental device for testing wiper and windshield friction vibration noise

technical field

The invention relates to the field of automobile testing, in particular to an experimental device for testing frictional vibration noise of wipers and windscreens.

Background technique

The car wiper and windshield are important parts of the vehicle. The windshield is located at the front of the car. The wiper is used to remove rain, snow, dust, mud and other dirt from the windshield, and can maintain the outer surface of the windshield. Clean, so that the driver's sight is clear, reducing the probability of accidents.

Due to the harsh working environment of the wiper system, the requirements for comfort, reliability and safety are very high, and the noise of the wiper system is particularly concerned. Wiper friction noise includes three types: scream noise (about 1000Hz), chatter noise (below about 100Hz) and reversal noise (below about 500Hz), which are respectively related to the high-frequency and low-frequency vibration of the wiper system and the blade reversal. related to the shock vibration generated during the

Experiment is the basic method to study the friction vibration noise of wiper and windshield, which is helpful to understand the appearance characteristics of noise. Traditional experimental platforms can be divided into real vehicle experiments and bench experiments. Since the gap between the wiper wiper and the scraper arm in a real vehicle is relatively fixed, it is difficult to add force sensors and other measuring instruments to measure friction and vertical pressure to obtain friction coefficient to characterize the conversion process of the glass surface from wet to semi-wet to dry environment, so this kind of experiment often uses a bench. In order to better simulate the running state of the wiper on a real vehicle, a pressure adjustment component needs to be installed on the wiper blade to simulate the static pressure distribution of the wiper blade on each point of the glass on the real vehicle, so that the accelerometer and the microphone are arranged to measure the The value of can be better approached to the value on the real vehicle. However, it is difficult to add a force sensor between the wiper blade and the wiper arm in the traditional bench test device, and it cannot be applied to most cars on the market. At the same time, because the pressure at each position between the wiper strip and the glass is not the same, resulting in Measured values may differ significantly from actual results.

Contents of the invention

Based on this, it is necessary to address the traditional wiper and windshield friction vibration noise experimental device, which is difficult to add a force sensor between the wiper blade and the wiper arm, and cannot be applied to most cars on the market. The pressure of the position is not the same, which may cause a large difference between the measured value and the actual result. It is possible to provide a force sensor between the scraper and the scraper arm, and the value measurement is more accurate for testing. Experimental device for frictional vibration noise of wiper and windshield.

An experimental device for testing the frictional vibration noise of wiper and windshield, including a test bench, a cross drive part, a unidirectional force sensor and a wiper assembly;

A windshield glass is installed in the test bench, and the cross drive part is installed on the test bench, and its movable end can move longitudinally and laterally respectively; one end of the wiper assembly is installed through two unidirectional force sensors. On the movable end of the cross drive part, one of the unidirectional force sensors is arranged longitudinally, the other unidirectional force sensor is arranged laterally, and the vacant ends of the two are connected; the other end of the wiper assembly Conflicts with the windshield.

Further, the wiper assembly includes a mounting bracket, a pressure regulating component and a wiper blade;

The installation frame is installed on the vacant end of a unidirectional force sensor, the pressure adjustment part has a built-in spring, and a plurality of the pressure adjustment parts are fixed on the installation frame at intervals, and the scraper is installed on the lower end of the installation frame. And one end thereof conflicts with the springs in the plurality of pressure regulating parts, and a sheet type pressure sensor is respectively arranged between each spring and the wiper, and the other end conflicts with the windshield.

Further, the pressure regulating component includes a sleeve, a bolt and the above-mentioned spring;

The sleeve is fixed on the mounting bracket, the spring is located in the sleeve, the bolt passes through the top of the sleeve, and is threadedly connected with the sleeve; one end of the spring conflicts with the bolt, and the other end of the spring It is in conflict with the scraper through the elastic metal sheet.

Further, the part of the bolt located outside the sleeve is screwed with a nut.

Further, the fastening rotation directions of the bolt and the nut are opposite.

Further, the vacant ends of the two unidirectional force sensors are connected through an L-shaped connecting plate, and one ends of the two unidirectional force sensors are respectively vertically fixed on two sides of the L-shaped connecting plate.

Further, the cross drive part includes a horizontal ball screw and a vertical ball screw;

The horizontal ball screw is fixed on the test bench through a support seat, and both the horizontal ball screw and the longitudinal ball screw have sliding guide rails, and both sliding guide rails have sliders; the horizontal ball screw One end of the screw rod is provided with a motor for driving its inner slider to move along the sliding guide rail, and one end of the longitudinal ball screw is provided with a rocker for driving its inner slider to move along the sliding guide rail;

The longitudinal ball screw is fixed on the slider of the horizontal ball screw, and the two constitute a cross movement mechanism; the vacant end of one of the unidirectional force sensors is connected with the slider in the longitudinal ball screw.

Further, a drag chain is laid on the horizontal ball screw, and one end of the drag chain is fixed on the longitudinal ball screw, and is bent to form a U-shaped structure.

Further, it also includes a humidifying component, the humidifying component includes a spray head and a diaphragm pump; the spray head is fixed on the longitudinal ball screw with the opening facing downward, the spray head is connected to the diaphragm pump through a water pipe, and the water pipe is connected to the diaphragm pump along the drag chain Arranged, the diaphragm pump is also communicated with the water tank.

Further, a drainage groove is provided on the test bench, and the drainage groove is located on the outer ring of the windshield glass.

The above-mentioned experimental device for testing the frictional vibration noise of the wiper and windshield connects the cross drive part and the wiper assembly through two unidirectional force sensors arranged perpendicular to each other. The operating status of the wiper blade can be applied to the windshield glass in different sizes, so as to measure the normal force and friction force of the wiper blade against the glass during the wiping process, and the measurement is more accurate.

Description of drawings

Fig. 1 is the schematic diagram of the three-dimensional structure of the experimental device;

Fig. 2 is the partial structure schematic diagram of experimental device;

Fig. 3 is a three-dimensional structural schematic diagram of the wiper assembly;

Fig. 4 is a structural schematic diagram of a pressure regulating component.

In the figure: 100, cross drive part; 110, horizontal ball screw; 111, motor; 112, support base; 120, vertical ball screw; 121, rocker; 200, test bench; 210, drainage groove; 220, air Spring seat; 300, detection part; 310, one-way force sensor; 320, L-shaped connecting plate; 400, wiper assembly; 410, installation frame; 420, pressure adjustment part; 421, sleeve; 422, spring; 423 , bolt; 424, nut; 430, wiper blade; 440, elastic metal sheet; 500, humidifying component; 510, towline; 60, windshield glass.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figures 1 and 2, in one embodiment, an experimental device for testing frictional vibration noise of wipers and windshields includes a test bench 200, a cross drive part 100, a one-way force sensor 310 and a wiper assembly. 400; the windshield glass 60 is installed in the test bench 200, and the cross drive part 100 is installed on the test bench 200, and its movable end can move longitudinally and laterally respectively; one end of the wiper assembly 400 passes through two unidirectional force The sensor 310 is installed on the movable end of the cross drive part 100, one unidirectional force sensor 310 is arranged longitudinally, the other unidirectional force sensor 310 is arranged transversely, and the vacant ends of the two are connected; the other end of the wiper assembly 400 One end conflicts with the windshield glass 60 . Wherein, a plurality of air spring seats 220 are installed under the test bench 200 for support.

The above-mentioned cross driving part 100 can drive the wiper assembly 400 to move along the normal line of the windshield glass 60, so that the wiper blade 430 is in contact with the windshield glass 60. At this time, the vertically arranged unidirectional force sensor 310 can measure the conflicting pressure. detection, and then the cross driving part 100 drives the wiper to move along the surface of the windshield glass 60 , and at this time, the one-way force sensor 310 arranged laterally will detect the friction force.

The above-mentioned experimental device for testing the frictional vibration noise of the wiper and windshield connects the cross drive part 100 and the wiper assembly 400 through two unidirectional force sensors 310 arranged perpendicularly to each other. The running state of the upper wiper blade 430 can apply different sizes of force to the windshield glass 60, so as to measure the normal force and friction force of the wiper blade 430 against the glass during the wiping process, and the measurement is more accurate.

As shown in FIG. 3 and FIG. 4 , in this embodiment, the wiper assembly 400 includes a mounting frame 410 , a pressure regulating component 420 and a scraper blade 430 ; the mounting frame 410 is mounted on an empty end of a unidirectional force sensor 310 The pressure regulating part 420 has a built-in spring 422, and a plurality of pressure regulating parts 420 are fixed on the mounting frame 410 at intervals, and the scraper 430 is installed on the lower end of the mounting frame 410, and one end thereof is in conflict with the spring 422 in the multiple pressure regulating parts 420 , and each spring 422 and the scraper 430 are respectively provided with a sheet type pressure sensor, and the other end is in conflict with the windshield glass 60 .

The above-mentioned vacant end refers to an end that is not connected with other components.

The above-mentioned wiper assembly 400 is provided with a sheet type pressure sensor between each spring 422 and the wiper 430, so that the experimental device can detect the pressure of each point on the wiper 430, and the detection precision is high and more accurate.

The above-mentioned wiper assembly 400 is provided with a plurality of sleeves 421 at intervals, and a spring 422 is arranged in the sleeves 421 to squeeze the wiper blade 430 under the sleeve 421, so that the wiper blade 430 is more attached to the Windshield 60.

In this embodiment, the pressure regulating component 420 includes a sleeve 421, a bolt 423 and the above-mentioned spring 422; the sleeve 421 is fixed on the mounting frame 410, the spring 422 is located in the sleeve 421, the bolt 423 passes through the top of the sleeve 421, and It is threadedly connected with the sleeve 421 ; one end of the spring 422 is in conflict with the bolt 423 , and the other end of the spring 422 is in conflict with the scraper 430 through the elastic metal sheet 440 .

The above-mentioned elastic metal sheet 440 can be steel sheet or elastic metal alloy.

The above-mentioned wiper assembly 400, by setting the elastic metal sheet 440 between the scraper blade 430 and the spring 422, will push the spring 422 to deform when the bolt 423 is turned, so that the scraper blade 430 fixedly connected with the elastic metal sheet 440 will generate a slight deformation, so as to adjust the static pressure distribution of the scraper 430 on multiple points on the windshield glass 60 .

In this embodiment, a nut 424 is screwed on the part of the bolt 423 outside the sleeve 421 . The tightening rotation directions of the bolt 423 and the nut 424 are opposite. This makes the fixing of the bolt 423 more stable without rotation and loosening.

In this embodiment, the vacant ends of the two unidirectional force sensors 310 are connected by an L-shaped connecting plate 320 , and one ends of the two unidirectional force sensors 310 are respectively vertically fixed on two sides of the L-shaped connecting plate 320 . The above-mentioned two unidirectional force sensors 310 and one L-shaped connecting plate 320 constitute the detection component 300 .

In this embodiment, the cross driving part 100 includes a horizontal ball screw 110 and a vertical ball screw 120;

The horizontal ball screw 110 is fixed on the test bench through the support seat 112, and both the horizontal ball screw 110 and the vertical ball screw 120 have slide rails, and both slide rails have sliders; one end of the horizontal ball screw 110 is provided with There is a motor 111 for driving the inner slider to move along the slide rail, and one end of the longitudinal ball screw 120 is provided with a rocker 121 for driving the inner slider to move along the slide rail; the longitudinal ball screw 120 is fixed on the horizontal ball screw 110 on the slider, and both constitute a cross moving mechanism; a unidirectional force sensor 310 vacant end is connected with the slider in the longitudinal ball screw 120 .

In this embodiment, a drag chain 510 is laid on the horizontal ball screw 110 , and one end of the drag chain 510 is fixed on the longitudinal ball screw 120 and bent to form a U-shaped structure.

In this embodiment, the above-mentioned experimental device also includes a humidifying unit 500, and the humidifying unit 500 includes a nozzle and a diaphragm pump; the nozzle is fixed on the longitudinal ball screw 120, and the opening is downward, and the nozzle is connected with the diaphragm pump through a water pipe, and the water pipe is dragged along the The chain 510 is arranged, and the diaphragm pump is also communicated with the water tank.

The above-mentioned experimental device connects the horizontal ball screw 110 and the vertical ball screw 120 by using the drag chain 510, and bends the drag chain 510 into a U-shaped structure, and the water pipes are arranged along the drag chain 510, so that the water pipe of the humidifying part 500 does not The kinks affect the humidification of the windshield 60 and the arrangement is more regular.

In this embodiment, a drainage groove 210 is provided on the test bench 200 , and the drainage groove 210 is located on the outer ring of the windshield glass 60 .

When the above-mentioned experimental device is in use, the controller outputs positioning instructions and pulse signals to the servo driver, wherein the pulse signal includes the pulse frequency for controlling the speed, the number of pulses for controlling the distance and the running direction. The servo driver drives the motor 111, and the motor 111 converts the position and The speed signal is fed back to the encoder, and the encoder reads and corrects these signals and sends them back to the servo driver. The whole process forms a closed loop.

After the servo motor 111 is powered on, it drives the screw inside the horizontal ball screw 110 to rotate, so that the slider can only do horizontal reciprocating motion; the externally connected vertical ball screw 120 drives the one-way force sensor 310 and the wiper assembly 400, etc. The parts make horizontal reciprocating movements; by adjusting the rotating rocker 121, the wiper blade 430 can be attached to the windshield glass 60 fixed on the base of the test bench 200 with a certain pressure. The running state of slice 430.

The pressure regulating part 420 uses the spring 422 as a damping element to ensure that the elastic metal sheet 440 will not be permanently deformed due to large displacement when the bolt 423 moves downward, and the purpose of fine-tuning the pressure can also be achieved; tightening the nut 424 can achieve The purpose of keeping the pressure at each point constant.

The water pipe is externally connected to the diaphragm pump and water tank. By adjusting the voltage of the diaphragm pump, the water pressure can be changed to change the flow rate, which can simulate different precipitation intensities when driving; after the tow chain 510 is hinged by chain blocks, within a certain angle range, Rotate along the center of the hinge hole, so as to realize the movement of the water pipe along with the movement of the longitudinal ball screw 120 in the vertical direction, and continuously spray water while wiping back and forth on the entire windshield glass 60 .

Before carrying out the experimental test of the above-mentioned experimental device, the sheet-type (or membrane-type static) pressure sensors are arranged in an array and placed under the spring 422. There are a plurality of distribution points, and the rocker 121 is turned to load the pressure on the windshield glass through the scraper 430. 60, the value of the pressure to be measured is displayed by the computer connected to the unidirectional force sensor 310 in the vertical direction; the pressure data of each point detected by the experimental device is detected and displayed by each sheet pressure sensor, and the pressure distribution is expressed in N/ The unit of m represents the pressure on the 430 unit length of the scraper; the pressure distribution data is also measured once on the real vehicle, and then the two sets of data are drawn on the computer using matlab (Matrix Laboratory) in the form of pressure distribution for comparison ; Finely adjust the pressure at each point by rotating the bolt 423, after adjusting to the data closest to the actual vehicle, take out the sensor and calibrate it.

During the test, the motor 111 runs at different speeds (the running speed of the horizontal ball screw 110 does not exceed 1250mm/s), and the rocker 121 is rotated to adjust different pressure values (generally, the pressure value per unit length of the wiper strip ranges from 15N/m to 25N/m means that the measured pressure value ranges from 1.8N to 3N), and different pressure values can be displayed on the computer through the unidirectional force sensor 310 in the vertical direction. The indoor ambient temperature can be adjusted between 16 and 30°C, and the glass surface is dry , semi-humid, wet state test (the three working conditions are distinguished by the size of the friction coefficient, the friction coefficient is measured by the unidirectional force sensor 310 to measure the force on the horizontal and vertical, and the curve of the force versus time is drawn by the computer and then Calculate the curve of friction coefficient versus time). The accelerometer is arranged on the wiper blade 430 and the lower surface of the windshield glass 60, and the microphone is arranged at the position when the wiper blade 430 is reversed. The signal is collected by the LMS SCM05 and transmitted to the computer to measure the impact of rain under different wiping speeds, pressures and temperatures. The impact of vibration and noise when scraping reverse.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (7)

1. The experimental device for testing friction vibration noise of the windscreen wiper and the windshield is characterized by comprising an experimental bench, a cross driving part, a unidirectional force sensor and a windscreen wiper assembly;

the experiment table is internally provided with windshield glass, the cross driving part is arranged on the experiment table, and the movable end of the cross driving part can move longitudinally and transversely respectively; one end of the wiper assembly is arranged on the movable end of the cross driving part through two unidirectional force sensors, one unidirectional force sensor is arranged longitudinally, the other unidirectional force sensor is arranged transversely, the two unidirectional force sensors are connected at the vacant end, and the vacant end is the end which is not connected with other parts; the other end of the wiper assembly is abutted against the windshield glass; one empty ends of the two unidirectional force sensors are connected through an L-shaped connecting plate, and one ends of the two unidirectional force sensors are respectively and vertically fixed on two edges of the L-shaped connecting plate;

the wiper assembly comprises a mounting frame, a pressure adjusting part and a wiper blade;

the mounting frame is arranged at one empty end of the unidirectional force sensor, springs are arranged in the pressure regulating parts, the pressure regulating parts are fixed on the mounting frame at intervals, the scraping blade is arranged at the lower end of the mounting frame, one end of the scraping blade is in contact with the springs in the pressure regulating parts, a sheet-type pressure sensor is respectively arranged between each spring and the scraping blade, and the other end of the scraping blade is in contact with the windshield glass;

the pressure regulating component comprises a sleeve, a bolt and the spring;

the sleeve is fixed on the mounting frame, the spring is positioned in the sleeve, and the bolt penetrates through the top end of the sleeve and is in threaded connection with the sleeve; one end of the spring is abutted against the bolt, and the other end of the spring is abutted against the scraping blade through the elastic metal sheet.

2. The experimental device for testing friction vibration noise of a wiper and a windshield according to claim 1, wherein a nut is screwed to a portion of the bolt located outside the sleeve.

3. The experimental device for testing the friction vibration noise of a wiper and a windshield according to claim 2, wherein the fastening rotation directions of the bolt and the nut are opposite.

4. The experimental set-up for testing the friction vibration noise of a wiper and a windshield according to claim 1, wherein the cross drive component comprises a transverse ball screw and a longitudinal ball screw;

the transverse ball screw is fixed on the test bed through a supporting seat, sliding guide rails are arranged in the transverse ball screw and the longitudinal ball screw, and sliding blocks are arranged on the two sliding guide rails; one end of the transverse ball screw is provided with a motor for driving the inner slide block to move along the sliding guide rail, and one end of the longitudinal ball screw is provided with a rocker for driving the inner slide block to move along the sliding guide rail;

the longitudinal ball screw is fixed on a sliding block of the transverse ball screw, and the longitudinal ball screw and the sliding block form a cross moving mechanism; and the empty end of one-way force sensor is connected with a sliding block in the longitudinal ball screw.

5. The experimental device for testing friction vibration noise of a wiper and a windshield according to claim 4, wherein a drag chain is laid on the transverse ball screw, and one end of the drag chain is fixed on the longitudinal ball screw and bent to form a U-shaped structure.

6. The experimental set-up for testing the frictional vibration noise of a wiper and a windshield of claim 5, further comprising a humidifying component comprising a spray head and a diaphragm pump; the spray head is fixed on the longitudinal ball screw, the opening of the spray head faces downwards, the spray head is connected with the diaphragm pump through a water pipe, the water pipe is distributed along the drag chain, and the diaphragm pump is also communicated with the water tank.

7. The experimental device for testing friction vibration noise of a windscreen wiper and a windshield according to claim 1, wherein a drainage groove is formed in the experimental table and is located on the outer ring of the windshield.