Method and equipment for testing noise of excavator cab

Abstract

The invention discloses a method and equipment for testing noise of an excavator cab. The method comprises the following steps: identifying a current working condition state; acquiring noise data of a plurality of positions in the excavator cab under the current working condition state; determining the noise weight coefficient of each position according to the importance degree of the position, and carrying out weighted calculation on the noise data of each position to obtain the total noise level of the current working condition; and determining the use time weight coefficient of each working condition according to the proportion of the working time of each working condition in the total time of the working cycle, and carrying out weighted calculation on the total noise level of each working condition to obtain the comprehensive noise level of the excavator cab. Weighted calculation is carried out on noise of multiple positions of the cab under various working conditions, the accurate total noise level of all the working conditions is obtained, the weighted noise level, namely the comprehensive noise level in the excavator cab is obtained through real-time comprehensive calculation in combination with the working condition use time, and a scientific basis is provided for overall evaluation and improvement of the cab noise.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering machinery, and in particular relates to a method and equipment for testing noise in an excavator cab. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The noise generated by the excavator cab under different working conditions will vary depending on the location, and the actual experience of the driver will be affected by the combined influence of the noise distribution in the cab and the working conditions. Existing technologies often cannot fully reflect the impact of the noise characteristics of each location inside the cab on the overall noise level, resulting in insufficient noise assessment accuracy and difficulty in effectively reducing noise. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a testing method and equipment for the noise in the cab of an excavator. By weighted calculation of the noise at multiple positions in the cab under various working conditions, an accurate total noise level of each working condition is obtained. Then, combined with the working time, a weighted noise level is calculated in real time, that is, the comprehensive noise level in the cab of the excavator, to provide a scientific basis for the overall evaluation and improvement of the cab noise.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] On the one hand, the technical solution of the present invention provides a method for testing the noise of an excavator cab, comprising:

[0007] Identify the current working status;

[0008] Collect noise data at multiple locations in the excavator cab under current working conditions;

[0009] Determine the noise weight coefficient of each position according to the importance of the position, perform weighted calculation on the noise data of each position, and obtain the total noise level of the current working condition;

[0010] The weight coefficient of the use time of each working condition is determined according to the proportion of the working time of each working condition in the total working cycle time, and the total noise level of each working condition is weightedly calculated to obtain the comprehensive noise level of the excavator cab.

[0011] In at least one embodiment, the operating conditions include idling, accelerating, rotating, digging, and walking.

[0012] In at least one embodiment, the total noise level is:

[0013]

[0014] Among them, L total is the total noise level, L pj is the noise level at the jth position, W pj is the noise weight coefficient of the jth position.

[0015] In at least one embodiment, the noise weight coefficient at each position satisfies:

[0016] In at least one embodiment, the comprehensive noise level is:

[0017]

[0018] Among them, L weight is the comprehensive noise level, L i is the noise level of each working condition, W i Use the time weight factor for this load case.

[0019] In at least one embodiment, the total duty cycle time is:

[0020] T total =T Idle +T Accel +T Rot +T Dig

[0021] Among them, T total is the total working cycle time, T Idle is the idle operating time, T Accel T is the time of use in acceleration condition. Rot is the time used for the rotation condition, T Dig Use time for excavation conditions.

[0022] On the other hand, the technical solution of the present invention also provides a test device for excavator cab noise, comprising:

[0023] The working condition identification module is connected to the excavator control system to identify and record the current working condition in real time;

[0024] Noise sensor array, used to collect noise data in the excavator cab;

[0025] A data acquisition module, used to collect the noise data collected by the noise sensor array and transmit the collected noise data to a data processing module;

[0026] The data processing module is used to analyze noise data in real time, generate the total noise level of each working condition based on the noise data of each position under different working conditions, and then calculate the comprehensive noise level in the excavator cab based on the working condition usage time.

[0027] In at least one embodiment, a display terminal is also included for displaying the total noise level and the comprehensive noise level of each operating condition to facilitate user evaluation and noise reduction.

[0028] In at least one embodiment, the noise sensor array is a plurality of noise sensors forming a three-dimensional spatial noise measurement layout in the excavator cab.

[0029] In at least one embodiment, the data acquisition module is connected to a noise sensor and a data processing module installed in the cab respectively through a data transmission line.

[0030] The beneficial effects of the technical solution of the present invention are as follows:

[0031] 1) A testing method for excavator cab noise of the present invention performs weighted calculation on the noise at multiple positions in the cab under various working conditions to obtain an accurate total noise level under each working condition, and then combines the working time to obtain a weighted noise level in real time, i.e., the comprehensive noise level in the excavator cab, providing a scientific basis for the overall evaluation and improvement of cab noise.

[0032] 2) The present invention provides an accurate measurement method for excavator cab noise assessment by combining multi-point noise measurement, multi-position weighted calculation and working condition weighting, and provides effective data support for improving the driver's work comfort and health and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0034] Figure 1 It is a schematic diagram of a testing method for excavator cab noise of the present invention;

[0035] Figure 2 It is a schematic diagram of a testing device for excavator cab noise of the present invention;

[0036] Figure 3 It is a schematic diagram of a specific implementation process of a method for testing noise in an excavator cab of the present invention. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0038] As described in the background technology, the purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and provide a method and device for testing the noise in the cab of an excavator.

[0039] Example 1

[0040] like Figure 1 As shown, in a typical implementation of the present invention, this embodiment discloses a method for testing noise in an excavator cab, comprising:

[0041] S1. Identify the current working state;

[0042] S2. Collect noise data at multiple locations in the excavator cab under the current working condition;

[0043] S3. Determine the noise weight coefficient of each position according to the importance of the position, perform weighted calculation on the noise data of each position, and obtain the total noise level of the current working condition;

[0044] S4. Determine the weight coefficient of the use time of each working condition according to the proportion of the working time of each working condition in the total working cycle time, perform weighted calculation on the total noise level of each working condition, and obtain the comprehensive noise level of the excavator cab.

[0045] The detailed description is given below.

[0046] S1. Identify the current working status.

[0047] The noise generated by the excavator under different working conditions is different. When evaluating the noise, it is necessary to consider the working state when the noise is generated. In this embodiment, the working state includes but is not limited to idling, accelerating, rotating, digging, walking, etc. Before collecting noise data, the current working state is first identified and the working condition information at this time is recorded.

[0048] S2. Collect noise data at multiple locations in the excavator cab under the current working condition.

[0049] The noise generated by the excavator cab under the same working condition will vary depending on the location. Therefore, noise sensors are installed at multiple locations inside the excavator cab to form a noise collection array to collect noise data at multiple locations in the excavator cab under the current working condition. In this embodiment, the locations where the noise sensors are installed include but are not limited to the ear, air conditioning outlet, front, side, top, etc.

[0050] S3. Determine the noise weight coefficient of each position according to the importance of the position, perform weighted calculation on the noise data of each position, and obtain the total noise level of each working condition.

[0051] Assume there are multiple positions in the cab, and the noise level at the corresponding position is L p1, L p2 , ..., L pn The noise weight of each position is determined according to the importance of the position. For example, the noise weight of the ear position is the highest, followed by the side position, the front position, the air conditioner outlet position, and the top position. Under a certain working condition, the noise weight coefficient W is assigned to each position according to the importance of the position. p1 , W p2 , ..., W pn , then the total noise level of this condition is L total The calculation formula is:

[0052]

[0053] Among them, L pj is the noise level at the jth position, in dB(A); W pj is the noise weight coefficient of the jth position, satisfying

[0054] S4. Determine the weight coefficient of the use time of each working condition according to the proportion of the working time of each working condition in the total working cycle time, perform weighted calculation on the total noise level of each working condition, and obtain the comprehensive noise level of the excavator cab.

[0055] Assume that an excavator has common working conditions such as idling, acceleration, rotation and digging in a working cycle. The total noise level of each working condition is defined as L Idle , L Accel , L Rot , and L Dig , the corresponding working conditions are used for T Idle 、T Accel 、T Rot , and T Dig , then the total working cycle time T total The calculation formula is:

[0056] T total =T Idle +T Accel +T Rot +T Dig .

[0057] The weight of the working condition usage time is the proportion of the current working condition in the total working cycle time. Therefore, the working condition usage time weight coefficient is expressed as W i =T i / T total , then the comprehensive noise level in the excavator cab is L weight The calculation formula is:

[0058]

[0059] Among them, L i is the noise level of each working condition, W i Use the time weight factor for this load case.

[0060] The present embodiment provides a testing method for the noise of an excavator cab by weighted calculation of the noise at multiple positions in the cab under various working conditions to obtain an accurate total noise level for each working condition. The multi-point noise measurement is combined with a weighted algorithm to accurately reflect the impact of each position in the excavator cab on the noise, optimize the overall noise measurement accuracy, and then combine the working condition usage time to obtain a weighted noise level in real time, i.e., the comprehensive noise level in the excavator cab, providing a scientific basis for the overall evaluation and improvement of the cab noise.

[0061] Example 2

[0062] In a typical embodiment of the present invention, this embodiment discloses a test device for the noise of an excavator cab, such as Figure 2 As shown, including:

[0063] The working condition identification module is connected to the excavator control system to identify and record the current working condition in real time;

[0064] A noise sensor array, which is composed of multiple noise sensors installed at different positions in the excavator cab to form a three-dimensional spatial noise measurement layout in the cab to collect noise data in the excavator cab;

[0065] A data acquisition module, which is connected to the noise sensor and the data processing module installed in the cab through data transmission lines, and is used to collect noise data collected by the noise sensor array and transmit the collected noise data to the data processing module;

[0066] The data processing module is used to analyze noise data in real time, generate the total noise level of each working condition based on the noise data of each position under different working conditions, and then calculate the comprehensive noise level in the excavator cab based on the working condition usage time.

[0067] It also includes a display terminal for displaying the total noise level of each operating condition, spectrum analysis, integrated noise level, etc., to facilitate user evaluation and noise reduction.

[0068] Example 3

[0069] In a typical implementation of the present invention, this embodiment discloses a specific implementation process of a method for testing noise in an excavator cab, such as Figure 3 As shown, the following steps are included:

[0070] Step 1: Confirm the test environment to ensure that the excavator to be tested is placed in a noise test site and environment that meets national standards;

[0071] Step 2: Confirm the vehicle status to ensure that the status of the excavator and the cab meet the national standard noise test requirements;

[0072] Step 3: Install noise sensors at multiple locations inside the excavator cab to form a noise collection array;

[0073] Step 4: Start the excavator operation under different working conditions. The working condition recognition module detects the current working condition (such as idling, rotation, etc.) in real time, and the data acquisition system collects the noise data collected by the noise sensor in real time;

[0074] Step 5: The data processing module performs weighted calculation on the noise data according to the working condition and position weight to obtain the total noise level of each working condition;

[0075] Step 6: The data processing module further calculates the comprehensive noise level of the excavator cab by combining the working condition usage time weight;

[0076] Step 7. The display terminal displays the total noise level and comprehensive noise level of each working condition for the operator to evaluate.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for testing the noise in an excavator cab, characterized in that: include: Identify the current working status; Collect noise data at multiple locations in the excavator cab under current working conditions; Determine the noise weight coefficient of each position according to the importance of the position, perform weighted calculation on the noise data of each position, and obtain the total noise level of the current working condition; The weight coefficient of the use time of each working condition is determined according to the proportion of the working time of each working condition in the total working cycle time, and the total noise level of each working condition is weightedly calculated to obtain the comprehensive noise level of the excavator cab.

2. A method for testing noise in an excavator cab as claimed in claim 1, characterized in that: The operating conditions include idling, accelerating, rotating, digging, and walking.

3. A method for testing noise in an excavator cab as claimed in claim 1, characterized in that: The total noise level is: Among them, L total is the total noise level, L pj is the noise level at the jth position, W pj is the noise weight coefficient of the jth position.

4. A method for testing noise in an excavator cab as claimed in claim 3, characterized in that: The noise weight coefficient at each position satisfies:

5. A method for testing noise in an excavator cab as claimed in claim 1, characterized in that: The comprehensive noise level is: Among them, L weight is the comprehensive noise level, L i is the noise level of each working condition, W i Use the time weight factor for this load case.

6. A method for testing noise in an excavator cab as claimed in claim 1, characterized in that: The total working cycle time is: T total =T Idle +T Accel +T Rot +T Dig Among them, T total is the total working cycle time, T Idle is the idle operating time, T Accel T is the time of use in acceleration condition. Rot is the time used for the rotation condition, T Dig Use time for excavation conditions.

7. A test device for excavator cab noise, characterized in that: include: The working condition identification module is connected to the excavator control system to identify and record the current working condition in real time; Noise sensor array, used to collect noise data in the excavator cab; A data acquisition module, used to collect the noise data collected by the noise sensor array and transmit the collected noise data to a data processing module; The data processing module is used to analyze noise data in real time, generate the total noise level of each working condition based on the noise data of each position under different working conditions, and then calculate the comprehensive noise level in the excavator cab based on the working condition usage time.

8. The testing device for excavator cab noise according to claim 7, characterized in that: It also includes a display terminal for displaying the total noise level and comprehensive noise level of each operating condition, which is convenient for users to evaluate and reduce noise.

9. The testing device for excavator cab noise according to claim 7, characterized in that: The noise sensor array is a plurality of noise sensors that form a three-dimensional noise measurement layout in the excavator cab.

10. The testing device for excavator cab noise according to claim 7, characterized in that: The data acquisition module is connected to the noise sensor and the data processing module installed in the cab respectively through data transmission lines.

Images