CN112268814A - Abnormal sound resistant material evaluation method and device - Google Patents
Abnormal sound resistant material evaluation method and device Download PDFInfo
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- CN112268814A CN112268814A CN202011078859.6A CN202011078859A CN112268814A CN 112268814 A CN112268814 A CN 112268814A CN 202011078859 A CN202011078859 A CN 202011078859A CN 112268814 A CN112268814 A CN 112268814A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
Abstract
The invention discloses an abnormal sound resistant material evaluation method and device, wherein the abnormal sound resistant material evaluation method comprises the following steps: carrying out damping performance test on a sample to be tested to obtain a damping performance result of the sample to be tested; performing stick-slip performance test on the sample to be tested to obtain a stick-slip performance result of the sample to be tested; and carrying out comprehensive evaluation according to the damping performance result and the stick-slip performance result of the sample to be detected to obtain the abnormal sound resistance result of the sample to be detected. The invention provides a set of method for evaluating an abnormal-sound-resistant material of an abnormal-sound-resistant material, which greatly reduces the input and uncertainty of material verification; the abnormal sound resistant formula is designed quantitatively, so that the excessive abnormal sound resistant characteristic is avoided, and the material cost is reduced; and when the material is in factory inspection, the quality of the material is quickly evaluated, and the consistency of the product is ensured.
Description
Technical Field
The invention belongs to the field of detection methods, and particularly relates to an abnormal sound resistant material evaluation method and device.
Background
The intelligent furniture and the intelligent air conditioner are provided, so that the functional innovation intelligence is pursued, and the experience feeling and the comfort of the client are concerned more. Air conditioners on the market can make creaky sound when in operation, often disturb the sleep of customers, and in order to explore the source and the position of sound, when carrying out the simulation in the laboratory, can't pinpoint and abnormal sound takes place and have no specific law.
Abnormal sound is mainly caused by friction generated by mutual movement of parts of an air conditioner shell, existing manufacturers begin to research and develop abnormal sound resistant materials, a complete machine testing method is often directly adopted for verifying the abnormal sound resistant effect of the materials, the evaluation mode is high in uncertainty and large in investment, meanwhile, the abnormal sound resistant critical point cannot be accurately determined, the abnormal sound resistant performance of the materials is excessive, and the material cost is high.
Disclosure of Invention
The invention aims to provide an abnormal sound resistant material evaluation method and device, so as to evaluate the abnormal sound resistant performance of a material.
In order to achieve the purpose, the specific technical scheme of the abnormal sound resistant material evaluation method and the abnormal sound resistant material evaluation device is as follows:
an abnormal sound resistant material evaluation method includes:
carrying out damping performance test on a sample to be tested to obtain a damping performance result of the sample to be tested;
performing stick-slip performance test on the sample to be tested to obtain a stick-slip performance result of the sample to be tested;
and carrying out comprehensive evaluation according to the damping performance result and the stick-slip performance result of the sample to be detected to obtain the abnormal sound resistance result of the sample to be detected.
Further, the damping performance test comprises:
simulating a stress environment of a sample to be tested and fixing the sample to be tested;
vibrating a sample to be detected, and collecting amplitude dissipation data of the sample to be detected;
and obtaining the damping performance result of the sample to be tested according to the amplitude dissipation data of the sample to be tested.
Further, vibrating the sample to be tested comprises:
applying a bending force to one end of the sample to be detected to elastically deform the sample to be detected so as to shift the initial position; the elastic deformation of the sample to be detected is equal to the maximum displacement generated by vibration;
and removing the bending force, and vibrating and gradually restoring the sample to be detected.
Further, the damping performance test further includes:
drawing an amplitude-time relation graph according to the amplitude dissipation data;
taking the fixed percentage equal difference value of the amplitude attenuation to the maximum deviation initial position and obtaining the required time;
connecting adjacent time points to obtain an amplitude-time curve, and calculating the slope of the amplitude-time curve;
comparing the slope of the amplitude-time curve to a standard slope;
and when the slope of the amplitude-time curve is greater than the standard slope, the damping performance of the sample to be tested is normalized.
Further, the stick-slip performance test comprises:
simulating a stress environment of a sample to be tested, and mounting the sample to be tested on an elastic piece;
applying a constant force to the elastic part to slide so that the elastic part drives the sample to be tested to slide on the substrate from a standstill state;
collecting the acceleration of a sample to be detected within an initial specified time;
and obtaining the damping performance result of the sample to be detected according to the acceleration of the sample to be detected.
Further, the stick-slip performance test further comprises:
drawing an acceleration-time relation graph according to the acceleration data;
calculating the average value of the acceleration, and determining a standard coefficient according to the material of the sample to be detected;
multiplying the average value of the acceleration by a standard coefficient to obtain an acceleration upper limit standard;
comparing the maximum acceleration value with the upper acceleration limit standard;
and when the maximum acceleration value is smaller than the upper acceleration limit standard, the stick-slip performance of the sample to be tested is qualified.
Further, the comprehensive evaluation comprises:
and when the damping performance and the stick-slip performance of the sample to be detected are both qualified, the abnormal sound resistance of the sample to be detected is qualified.
An abnormal sound resistant material evaluation device comprises a damping performance testing device and a stick-slip performance testing device.
Further, the damping performance testing device comprises:
the mounting seat is fixed on the vertical surface, so that one end of a sample to be detected is fixed on the mounting seat, and the other end of the sample to be detected is a free end;
and the distance measuring instrument is used for collecting the amplitude and time of the sample to be measured.
Further, the stick-slip performance testing device includes:
the sliding block slides along a straight line under constant force;
one end of the elastic piece is fixed with the sliding block, and the other end of the elastic piece is fixed with a sample to be detected;
the base plate is used for sliding friction of a sample to be detected on the base plate under the driving of the elastic piece;
and the acceleration tester is used for collecting the acceleration of the sample to be tested within a fixed time.
The invention provides a set of method for evaluating an abnormal-sound-resistant material of an abnormal-sound-resistant material, which greatly reduces the input and uncertainty of material verification; the abnormal sound resistant formula is designed quantitatively, so that the excessive abnormal sound resistant characteristic is avoided, and the material cost is reduced; and when the material is in factory inspection, the quality of the material is quickly evaluated, and the consistency of the product is ensured.
Drawings
FIG. 1 is a flow chart of the method for evaluating an abnormal noise resistant material according to the present invention;
FIG. 2 is a schematic structural diagram of a damping performance testing apparatus according to the present invention;
FIG. 3 is a schematic structural diagram of a stick-slip performance testing apparatus according to the present invention;
FIG. 4 is a graph of amplitude versus time according to the present invention;
FIG. 5 is a graph of acceleration versus time for the present invention.
The notation in the figure is:
1. detecting a sample strip; 2. a mounting seat; 3. a range finder; 4. a slider; 5. a substrate; 6. a constant force spring; 7. an acceleration tester.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the following describes a method and apparatus for evaluating abnormal noise resistant material in detail with reference to the accompanying drawings.
When the household appliance runs, the components move relatively to generate abnormal sound due to the alternation of cold and heat. The essential reasons are: abnormal sound caused by vibration and stick-slip. Vibration: when the household appliance runs, the components move mutually to cause abnormal vibration of the components and generate vibration noise; stick-slip: the parts move mutually to generate mutual friction, and the friction noise is the stick-slip noise.
Therefore, the method for evaluating the abnormal sound resistant material comprises the following steps:
carrying out damping performance test on a sample to be tested to obtain a damping performance result of the sample to be tested;
performing stick-slip performance test on the sample to be tested to obtain a stick-slip performance result of the sample to be tested;
and carrying out comprehensive evaluation according to the damping performance result and the stick-slip performance result of the sample to be detected to obtain the abnormal sound resistance result of the sample to be detected.
The damping performance test comprises the following steps:
simulating a stress environment of a sample to be tested and fixing the sample to be tested;
vibrating a sample to be detected, and collecting amplitude dissipation data of the sample to be detected;
drawing an amplitude-time relation graph according to the amplitude dissipation data;
taking the fixed percentage equal difference value of the amplitude attenuation to the maximum deviation initial position and obtaining the required time;
connecting adjacent time points to obtain an amplitude-time curve, and calculating the slope of the amplitude-time curve;
and comparing the slope of the amplitude-time curve with the standard slope to determine whether the damping performance of the sample to be detected is qualified.
According to principle analysis, the larger the slope of the amplitude-time curve is, the better the damping performance of the sample to be tested is.
For the convenience of experimental judgment:
when the slope of the amplitude-time curve is greater than the standard slope, the damping performance of the sample to be tested is normalized;
and when the slope of the amplitude-time curve is smaller than the standard slope, the damping performance of the sample to be detected is not in accordance with the standard.
Thus, the damping performance result of the sample to be tested is obtained.
Wherein, make the sample that awaits measuring vibrate, include:
applying a bending force to one end of the sample to be detected to elastically deform the sample to be detected so as to shift the initial position; the elastic deformation of the sample to be detected is equal to the maximum displacement generated by vibration;
and removing the bending force, and vibrating and gradually restoring the sample to be detected.
The stick-slip performance test comprises the following steps:
simulating a stress environment of a sample to be tested, and mounting the sample to be tested on an elastic piece;
applying a constant force to the elastic part to slide so that the elastic part drives the sample to be tested to slide on the substrate from a standstill state;
acquiring the acceleration of a sample to be detected in an initial specified time, and acquiring the deviation distance of the sample to be detected relative to the substrate caused by the elastic deformation of the elastic piece; wherein, the initial specified time is a time period which takes the time point when the elastic part is subjected to the constant force as the initial time, and is generally 10 s;
drawing an acceleration-time relation graph according to the acceleration data;
calculating the average value of the acceleration, and determining a standard coefficient according to the material of the sample to be detected;
multiplying the average value of the acceleration by a standard coefficient to obtain an acceleration upper limit standard;
and comparing the maximum acceleration value with the upper acceleration limit standard to determine whether the stick-slip performance of the sample to be tested is qualified.
According to principle analysis, the closer the acceleration is to the theoretical acceleration, the better the stick-slip performance is.
In order to facilitate experimental judgment, the average acceleration is equal to the theoretical acceleration;
and when the maximum acceleration value is smaller than the upper acceleration limit standard, the stick-slip performance of the sample to be tested is qualified.
And when the maximum acceleration value is larger than the upper limit standard of the acceleration, the stick-slip performance of the sample to be tested is not in accordance with the standard.
Thus, the damping performance result of the sample to be tested is obtained.
And the comprehensive evaluation comprises the following steps:
when the damping performance and the stick-slip performance of the sample to be detected are both on the same scale, the abnormal sound resistance of the sample to be detected is on the same scale;
and when any one of the damping performance and the stick-slip performance of the sample to be detected is not qualified, the abnormal sound resistance of the sample to be detected is not qualified.
An abnormal sound resistant material evaluation device comprises a damping performance testing device and a stick-slip performance testing device.
As shown in fig. 2, the damping performance test apparatus includes:
the mounting seat 2 is fixed on the vertical surface, so that one end of a sample to be detected is fixed on the mounting seat 2, and the other end of the sample to be detected is a free end;
and the distance measuring instrument 3 is used for collecting the amplitude and the time of the sample to be measured.
As shown in fig. 3, the stick-slip performance testing apparatus includes:
the sliding block 4 slides along a straight line under constant force;
one end of the elastic piece is fixed with the sliding block 4, and the other end of the elastic piece is fixed with a sample to be detected;
the base plate 5 is used for sliding friction of a sample to be detected on the base plate under the driving of the elastic piece;
an acceleration tester 7 for collecting the acceleration of the sample to be tested within a fixed time
The material of the substrate 5 is the same as that of the contact part with the sample to be measured in the actual environment. And the elastic member is a constant force spring 6.
Example 1
Fixing a test sample to be tested with a fixed size on a fixing plate according to the mode of figure 2, and applying a certain force to the free end of the sample to be tested to enable the free end to deviate from the horizontal position by 1.5mm (set according to the actual maximum deviation distance of a product); after the hands are loosened, the upper amplitude and the lower amplitude are measured, an amplitude-time relation graph shown in fig. 4 is output, and the faster the amplitude dissipates, the better the damping effect is. And calculating the slope, and when the slope is greater than 1, marking the damping performance.
The sample to be tested is installed according to the graph shown in figure 3, the sliding block 4 slides on the fixed horizontal rail, the constant-force spring 6 drives the object to be tested to slide on the sliding block, the acceleration of the object to be tested on the constant-force spring 6 is measured, and the acceleration-time relation graph shown in figure 5 is output. Taking the standard coefficient as 1.5, and judging that the acceleration is balanced when the acceleration of each point in the test time period is less than or equal to 1.5a so as to meet the abnormal sound resistance requirement; when the acceleration point is more than 1.5a in the test time period, judging that the point is seriously sticky and slippery, abnormal sound exists and the abnormal sound resistant effect of the material is poor; when the two materials meet the requirement of abnormal sound resistance, the smaller the acceleration mean value a is, the better the stick-slip performance is.
When the damping performance and the stick-slip performance are both in the standard, the abnormal sound resistance performance is in the standard.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. An abnormal noise resistant material evaluation method is characterized by comprising the following steps:
carrying out damping performance test on a sample to be tested to obtain a damping performance result of the sample to be tested;
performing stick-slip performance test on the sample to be tested to obtain a stick-slip performance result of the sample to be tested;
and carrying out comprehensive evaluation according to the damping performance result and the stick-slip performance result of the sample to be detected to obtain the abnormal sound resistance result of the sample to be detected.
2. The abnormal noise-resistant material evaluation method according to claim 1, wherein the damping performance test includes:
simulating a stress environment of a sample to be tested and fixing the sample to be tested;
and vibrating the sample to be detected, and collecting the amplitude dissipation data of the sample to be detected.
3. The abnormal noise-resistant material evaluation method according to claim 2, wherein vibrating the sample to be tested includes:
applying a bending force to one end of the sample to be detected to elastically deform the sample to be detected so as to shift the initial position; the elastic deformation of the sample to be detected is equal to the maximum displacement generated by vibration;
and removing the bending force, and vibrating and gradually restoring the sample to be detected.
4. The abnormal noise-resistant material evaluation method according to claim 2, wherein the damping performance test further comprises:
drawing an amplitude-time relation graph according to the amplitude dissipation data;
taking the fixed percentage equal difference value of the amplitude attenuation to the maximum deviation initial position and obtaining the required time;
connecting adjacent time points to obtain an amplitude-time curve, and calculating the slope of the amplitude-time curve;
comparing the slope of the amplitude-time curve to a standard slope;
and when the slope of the amplitude-time curve is greater than the standard slope, the damping performance of the sample to be tested is normalized.
5. The abnormal noise resistant material evaluation method according to claim 1, wherein the stick-slip performance test includes:
simulating a stress environment of a sample to be tested, and mounting the sample to be tested on an elastic piece;
applying a constant force to the elastic part to slide so that the elastic part drives the sample to be tested to slide on the substrate from a standstill state;
and acquiring acceleration data of the sample to be detected within an initial specified time.
6. The method for evaluating an abnormal noise-resistant material according to claim 5, wherein the stick-slip performance test further comprises:
drawing an acceleration-time relation graph according to the acceleration data;
calculating the average value of the acceleration, and determining a standard coefficient according to the material of the sample to be detected;
multiplying the average value of the acceleration by a standard coefficient to obtain an acceleration upper limit standard;
comparing the maximum acceleration value with the upper acceleration limit standard;
and when the maximum acceleration value is smaller than the upper acceleration limit standard, the stick-slip performance of the sample to be tested is qualified.
7. The abnormal-sound-resistant material evaluation method according to claim 1, wherein the comprehensive evaluation includes:
and when the damping performance and the stick-slip performance of the sample to be detected are both qualified, the abnormal sound resistance of the sample to be detected is qualified.
8. The abnormal sound resistant material evaluation device is characterized by comprising a damping performance testing device and a stick-slip performance testing device.
9. The abnormal noise-resistant material evaluation apparatus of claim 8, wherein the damping performance test apparatus comprises:
the mounting seat (2) is fixed on the vertical surface, so that one end of a sample to be tested is fixed on the mounting seat (2), and the other end of the sample to be tested is a free end;
and the distance measuring instrument (3) is used for collecting the amplitude and the time of the sample to be measured.
10. The abnormal noise-resistant material evaluation device according to claim 8, wherein the stick-slip performance test device comprises:
the sliding block (4) slides along a straight line under constant force;
one end of the elastic piece is fixed with the sliding block (4), and the other end of the elastic piece is fixed with a sample to be detected;
the base plate (5) is used for sliding friction of a sample to be detected on the base plate under the driving of the elastic piece;
and the acceleration tester (7) is used for collecting the acceleration of the sample to be tested within a fixed time.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114136570A (en) * | 2021-11-19 | 2022-03-04 | 四川启睿克科技有限公司 | Raw material quality identification method based on predictive maintenance data |
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| CN202814855U (en) * | 2012-09-27 | 2013-03-20 | 贵阳联洪合成材料厂 | Device for determining damping coefficient |
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| CN114136570A (en) * | 2021-11-19 | 2022-03-04 | 四川启睿克科技有限公司 | Raw material quality identification method based on predictive maintenance data |
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