Data processing method based on road spectrum bench testing machine

Abstract

The invention provides a data processing method based on a road spectrum bench testing machine, which is used for processing working signal data of a driving shaft in a road test and processing signal data of the driving shaft related to an acquisition frequency, and the processing process is used for analyzing unreasonable data. In the processing process, working signals of a driving shaft in the road spectrum data are reserved by neglecting reasonable data; the method specifically comprises the following steps: firstly, finding out data exceeding an equipment allowable range, averaging the data exceeding the equipment allowable range and data at a next moment, if an obtained average value is within the equipment allowable range, calculating the data exceeding the equipment allowable range and the data at the next moment, and outputting the average value; if the average value is not in the equipment allowable range, the average value is calculated downwards until the calculated average value is in the equipment allowable range, and then the average value is output; according to the method, only unreasonable data can be analyzed, and the working signal of the driving shaft in the road spectrum is reserved to the maximum extent.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing for a durability testing machine bench test, and in particular to a data processing method based on a Lupu bench test machine. Background Art

[0002] During normal driving of a car, the drive shaft system will be subjected to a certain torque and speed, and transmit these torque and speed to the wheels to achieve the driving of the car. The drive shaft parameters (swing angle, speed, torque, up and down vibration, etc.) are collected through sensor equipment in the test field road test, and then the collected data is correctly processed and imported into the high-dynamic durability test equipment. This is the current method of simulating real road conditions on the test bench to conduct durability tests on the drive shaft.

[0003] At present, the mainstream method for the original signal is to use filtering to process the sudden changes in values ​​caused by information interference. The filter is a frequency-selective circuit that allows useful signal frequencies to pass through and filters the frequencies of interfering signals. Filters can be divided into low-pass, high-pass, band-pass and band-stop filters according to the frequency bands that allow signals to pass through. In the filtered data, since the working signals of the drive shaft (swing angle, speed, torque, up and down vibration, etc.) are mainly concentrated in the low-frequency band, the current mainstream uses a 30Hz low-pass filter for filtering, which can reduce the impact of the high-frequency bands of the collected signal on the durability of the drive shaft system. After filtering, the road spectrum signal can become smooth.

[0004] However, for harsh working conditions such as small washboard roads and off-road roads, the uncertainty of the force on the drive shaft increases, and the working signals (swing angle, speed, torque, up and down vibration, etc.) themselves have the characteristics of fast data changes. If filtering processing methods are still used at this time, large-scale data distortion will be caused, and the real road conditions of the drive shaft cannot be correctly simulated on the test bench.

[0005] Therefore, the current mainstream filtering method can solve the problem of numerical mutation caused by information interference to a certain extent. However, there are still the following problems:

[0006] 1. For harsh working conditions, the data after filtering will cause large-scale distortion and cannot truly reflect the various working information of the drive shaft during the road test (swing angle, speed, torque, up and down vibration, etc.).

[0007] 2. There is controversy over the choice of 30Hz low-pass filter frequency in the processing process. For data processing on complex roads, if a lower filter frequency is selected, the processed data can meet the equipment's limit requirements, but there will be distortion; if a higher filter frequency is selected, data distortion can be alleviated to a certain extent, but there may be a situation where the processed data still cannot reach the capacity range allowed by the equipment.

[0008] 3. Based on point 2 above, the best filtering frequency is when the processed data just reaches the limit of the equipment's capabilities. This requires a lot of attempts by data processing engineers, which is not only time-consuming but also not universal. The new spectrum cannot be filtered using the previous frequency, and a new frequency needs to be found. Summary of the invention

[0009] The present invention proposes a data processing method based on a road spectrum bench test machine, which is a road spectrum data processing method based on a high dynamic endurance testing machine. It can only analyze unreasonable data and retain the working signals of the drive shaft in the road spectrum (swing angle, rotation speed, torque, up and down vibration, etc.) to the greatest extent.

[0010] The present invention adopts the following technical solutions.

[0011] A data processing method based on a road spectrum bench test machine, the method is used to process the working signal data of a drive shaft in a road test and the processing drive shaft signal data related to the acquisition frequency, the processing process analyzes unreasonable data, and in the processing process, the working signal of the drive shaft in the road spectrum data is retained by ignoring reasonable data;

[0012] The method is specifically as follows: first find the data that exceeds the allowable range of the device, and average the data that exceeds the allowable range of the device with the data at the next moment. If the average value is within the allowable range of the device, then calculate the data that exceeds the allowable range of the device with the data at the next moment, and output the average value; if it is not within the allowable range of the device, then continue to calculate the average value downward until the average value is within the allowable range of the device, and then output it.

[0013] The drive shaft is a drive shaft component in a vehicle drive shaft system, and its working signal data includes swing angle, rotation speed, torque, and up and down vibration.

[0014] The unreasonable data is manually set according to the allowable working conditions of the durability testing machine equipment, so that the data processed by the method is the final data that meets the allowable working conditions of the durability testing machine equipment.

[0015] The working signal data of the drive shaft is a sequence formed by the sampling time and the value of each working signal at the time point, the sampling interval between each value in the sequence is 0.01 second, the limit range of the allowable torque M of the drive shaft device is -4000Nm≤M≤4000Nm, and the limit range of the allowable torque change speed Ms is -600Nm / s≤Ms≤600Nm / s;

[0016] The method only processes the torque M and the torque change speed Ms that are beyond the limit range.

[0017] In the method, if the torque exceeds the limit range allowed by the device but the excess is negligible, the torque is adjusted to the upper limit or lower limit of the limit range; when calculating the unreasonable torque change speed Ms, the torque acceleration of the period is calculated by the provided time and torque information, and the calculation formula is as follows:

[0018] MS n+1 =(M n+1 -M n ) / (t n+1 -t n ) Formula 1;

[0019] In the formula, Ms is the torque acceleration; M is the torque; t is the time; n is the sequence number; the torque change speed of each group in the sequence is calculated in sequence;

[0020] The processing flow of the downward averaging method includes the following processes:

[0021] In process A1, n increases from 2. If the value is within the allowed range of the device, the value is output;

[0022] Process A2: If the value corresponding to n in process A1 is not within the range allowed by the device, locate the next data corresponding to the next sequence number and calculate the average with the next data;

[0023] Process A3: If the calculation result of process A3 is not within the range, it will not be output, and the average calculation will continue until the calculation result is within the range, and then it will be uniformly output as the average value.

[0024] In process A1, if n is 2, then Ms2=Ms2; then turn to the data corresponding to the next sequence number for processing; in process A2, if n is originally 3, then change it to 4, That is, if the calculation result is within the allowed range of the device, it will be output;

[0025] In process A3, n is taken as 5, If the result is still out of range, then n is set to 6. If the calculation result is still out of range, then n is set to 7 and the calculation is continued, and so on, until the calculation result is within the allowable range of the device.

[0026] The method outputs the driving shaft working data of the road test in process A1, process A2 and process A3. When the output value of each process needs to be verified, the following formula is used for verification: n+1 =M n +Ms n+1 ×(t n+1 -t n )

[0027] In the formula, Ms is the torque acceleration; M is the torque; t is the time; n is the sequence number, and the torque change speed of each group in the sequence is calculated in turn.

[0028] The present invention processes the original data of the road test experiment by the downward averaging method, and the data processed by this method can meet the operating condition limit allowed by the equipment.

[0029] During the processing, the present invention retains the data that meets the operating condition limit allowed by the equipment to the greatest extent.

[0030] The beneficial effects of the present invention also lie in:

[0031] 1. The data processed by this method of the present invention can meet the operating limit allowed by the equipment to the greatest extent, and the given data change amount can be appropriately adjusted according to the actual working conditions of the drive shaft. (For example, if the speed range of the equipment is ±2500rmp, and the acceleration of the speed is ±500rmp / s, the upper and lower limits of the data can be adjusted to ±2500 when processing the speed data, and the data change speed can be adjusted to ±500). It avoids filtering the data, so there is no need to spend a lot of time looking for the filtering frequency.

[0032] 2. This method of the present invention only analyzes the data that does not meet the allowable working condition limit, and processes it through the downward averaging method, avoiding the uncertainty of the amount of data processed by filtering. Compared with simple filtering, it can restore the working conditions of the drive shaft in the test field to the greatest extent, and avoid large-area distortion in filtering. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0034] Attached Figure 1 It is a schematic flow chart of the downward averaging method of the present invention;

[0035] Attached Figure 2 It is a schematic diagram of data processing for operating parameter equipment limits of the present invention. DETAILED DESCRIPTION

[0036] As shown in the figure, a data processing method based on a road spectrum bench test machine is used to process the working signal data of the drive shaft in the road test and the processing drive shaft signal data related to the acquisition frequency. The processing process analyzes unreasonable data and retains the working signal of the drive shaft in the road spectrum data by ignoring reasonable data during the processing;

[0037] The method is specifically as follows: first find the data that exceeds the allowable range of the device, and average the data that exceeds the allowable range of the device with the data at the next moment. If the average value is within the allowable range of the device, then calculate the data that exceeds the allowable range of the device with the data at the next moment, and output the average value; if it is not within the allowable range of the device, then continue to calculate the average value downward until the average value is within the allowable range of the device, and then output it.

[0038] The drive shaft is a drive shaft component in a vehicle drive shaft system, and its working signal data includes swing angle, rotation speed, torque, and up and down vibration.

[0039] The unreasonable data is manually set according to the allowable working conditions of the durability testing machine equipment, so that the data processed by the method is the final data that meets the allowable working conditions of the durability testing machine equipment.

[0040] The working signal data of the drive shaft is a sequence formed by the sampling time and the value of each working signal at the time point, the sampling interval between each value in the sequence is 0.01 second, the limit range of the allowable torque M of the drive shaft device is -4000Nm≤M≤4000Nm, and the limit range of the allowable torque change speed Ms is -600Nm / s≤Ms≤600Nm / s;

[0041] The method only processes the torque M and the torque change speed Ms that are beyond the limit range.

[0042] In the method, Figure 2 As shown in the figure, if the torque exceeds the limit range allowed by the equipment but the excess is negligible, the torque is adjusted to the upper or lower limit of the limit range; when calculating the unreasonable torque change speed Ms, the torque acceleration of the period is calculated through the provided time and torque information, and the calculation formula is as follows:

[0043] Ms n+1 =(M n+1 -M n ) / (t n+1 -t n ) Formula 1;

[0044] In the formula, Ms is the torque acceleration; M is the torque; t is the time; n is the sequence number; the torque change speed of each group in the sequence is calculated in sequence;

[0045] The processing flow of the downward averaging method includes the following processes:

[0046] In process A1, n increases from 2. If the value is within the allowed range of the device, the value is output;

[0047] Process A2: If the value corresponding to n in process A1 is not within the range allowed by the device, locate the next data corresponding to the next sequence number and calculate the average with the next data;

[0048] Process A3: If the calculation result of process A3 is not within the range, it will not be output, and the average calculation will continue until the calculation result is within the range, and then it will be uniformly output as the average value.

[0049] In process A1, if n is 2, then Ms2=Ms2; then turn to the data corresponding to the next sequence number for processing; in process A2, if n is originally 3, then change it to 4, That is, if the calculation result is within the allowed range of the device, it will be output;

[0050] In process A3, n is taken as 5, If the result is still out of range, then n is set to 6. If the calculation result is still out of range, then n is set to 7 and the calculation is continued, and so on, until the calculation result is within the allowable range of the device.

[0051] The method outputs the driving shaft working data of the road test in process A1, process A2 and process A3. When the output value of each process needs to be verified, the following formula is used for verification:

[0052] M n+1 =M n +Ms n+1 ×(t n+1 -t n )

[0053] In the formula, Ms is the torque acceleration; M is the torque; t is the time; n is the sequence number, and the torque change speed of each group in the sequence is calculated in turn.

[0054] Example:

[0055] In this example, a method for processing drive shaft signals based on the relationship between the working signals (swing angle, rotation speed, torque, up and down vibration, etc.) of the drive shaft and the acquisition frequency in the road test is provided. Different from the traditional filtering method, the downward averaging method in this invention can not only realize the analysis of only unreasonable data, but also retain the working signals (swing angle, rotation speed, torque, up and down vibration, etc.) of the drive shaft in the road spectrum to the greatest extent. At the same time, to find unreasonable data, engineers only need to set it according to the allowable working conditions of the durability test machine equipment, without a lot of adjustments and attempts. This not only greatly reduces the difficulty of processing data, but also the data processed by this method is the final data under the allowable working conditions of the durability test machine equipment.

[0056] The specific method is as follows Figure 1As shown, first find the data that exceeds the allowable range of the device, and average the data that exceeds the allowable range of the device with the data at the next moment. If the average value is within the allowable range of the device, the data that exceeds the allowable range of the device and the data at the next moment are output as the average value. If it is not within the allowable range of the device, then continue to average until the average value is within the allowable range of the device, and then output it.

[0057] In this example, the test site generally only provides the sampling time and the value of each working signal at that time point for the working signals (swing angle, rotation speed, torque, up and down vibration, etc.) of the drive shaft during the road test.

[0058] This example uses torque data provided by a test track. 0.01 seconds are intercepted for processing. The schematic diagram of the original data of the road spectrum is shown in Table 1.

[0059] Table 1 Road spectrum raw data

[0060]

[0061] From the table above, we can see that M1 is 4001Nm, which has exceeded the limit range of the equipment. However, due to the strict power limit of the experiment, it is only slightly exceeded, so it is adjusted to the limit range of the equipment (-4000≤M≤4000). Other data are within the range allowed by the equipment, so no adjustment is made. The adjusted data is shown in Table 2.

[0062] Table 2 Data after spectrum torque adjustment

[0063]

[0064] When calculating the torque change rate, the torque acceleration of the period is calculated using the provided time and torque information. The calculation formula is as follows:

[0065] Ms n+1 =(M n+1 -M n ) / (t n+1 -t n )

[0066] In the formula, Ms is the torque acceleration; M is the torque; t is the time; and n is the sequence number. Ten groups of torque change speeds are calculated in sequence. The diagram of the calculated data is shown in Table 3 below:

[0067] Table 3 contains the road spectrum data of torque change speed

[0068]

[0069] From the calculated data, we can see that when the values ​​are 3, 4, and 5, the torque acceleration is -667.7, -701.6, and -617.1 respectively. This exceeds the equipment limit condition -600≤Ms≤600. The downward averaging method is required for processing.

[0070] The processing flow of the downward averaging method is shown in Figure 1 , n starts to increase from 2. If the value is within the range allowed by the device, the value is output, n=n+1. If it is not within the range allowed by the device, n=n+1, and the next digit is averaged. If it is within the range, it is output. If it is not within the range, it is averaged downwards and then uniformly output as the average value. The following is the detailed processing flow:

[0071] 1. When n is 2, Ms=-407.2 (-600≤Ms≤600), then -407.2 is directly output.

[0072] -600≤Ms2≤600

[0073] Ms2=Ms2=-407.2

[0074] 2. When n is 3, the Ms value is -667.7 (<-600) and is not output. Calculate the average downward:

[0075] MS3≤-600

[0076]

[0077] In the formula, n is 4.

[0078] 3. After processing, Ms3=Ms4=-684.65(<-600), not output. Calculate the average downward:

[0079] Ms3=Ms4≤-600

[0080]

[0081] In the formula, n is 5.

[0082] 4. After processing, Ms3=Ms4=Ms5=-662.13(<-600), not output. Calculate the average downward:

[0083] Ms3=Ms4=Ms5≤-600

[0084]

[0085] In the formula, n is 6.

[0086] 5. After processing, Ms3=Ms4=Ms5=Ms6=-604.375(<-600), not output. Calculate the average downward:

[0087] Ms3=Ms4=Ms5=Ms6≤-600

[0088]

[0089] In the formula, n is 7.

[0090] 6. After processing, Ms3=Ms4=Ms5=Ms6=Ms7=-525.76 (-600≤Ms≤600), so Ms3=Ms4=Ms5=Ms6=Ms7=-52.5.76.

[0091] -600≤Ms3=Ms4=Ms5=Ms6=Ms7≤600

[0092] Ms3=Ms4=Ms5=Ms6=Ms7=-52.5.76

[0093] 7. When n is 8, Ms=16.9 (-600≤Ms≤600), then 16.9 is directly output.

[0094] -600≤Ms8≤600

[0095] Ms8=Ms8=16.9

[0096] 8. When n is 9, Ms=169 (-600≤Ms≤600), then 169 is output directly.

[0097] -600≤Ms9≤600

[0098] Ms9=Ms9=169

[0099] 9. When n is 10, Ms=236.7 (-600≤Ms≤600), then 236.7 is directly output.

[0100] -600≤Ms 10 ≤600

[0101] Ms 10 =Ms 10 =236.7

[0102] The schematic diagram of the road spectrum data before and after processing is shown in Table 4 below:

[0103] Table 4 Road spectrum data before and after processing

[0104]

[0105] In order to reflect the effect of data processing, the data is brought back to the test parameters.

[0106] The calculation formula is as follows:

[0107] Mn+1 =M n +Ms n+1 ×(t n+1 -t n )

[0108] In the formula, Ms is the torque acceleration; M is the torque; t is the time; and n is the sequence number. Ten groups of torque change speeds are calculated in sequence. The diagram of the calculated data is shown in Table 3 below:

[0109] 10 groups of torques are calculated in sequence. The diagram of the calculated data is shown in Table 5 below:

[0110] Table 5 Road spectrum data before and after processing

[0111]

[0112] (In Table 5, 1. Red marks indicate that the equipment cannot meet the requirements. 2. Blue marks indicate the numbers after downward averaging. 3. Yellow marks indicate that the torques are equal again.)

[0113] It can be seen from the table above. In the 0.1 second time from 161.49 to 161.58, only the values ​​when n is 3, 4, and 5 exceed the equipment limit. The downward averaging method not only makes the torque acceleration reach the operating range of the equipment, but also, among the 10 sets of data, 6 sets of values ​​are consistent with the original road spectrum, retaining the data of the original road spectrum to the greatest extent. The processed data and the original data fully restore the working conditions of the drive shaft in the road test while meeting the equipment operating conditions.

Claims

1. A data processing method based on a Lupu bench test machine, characterized in that: The method is used to process the working signal data of the drive shaft in the road test and the processing drive shaft signal data related to the acquisition frequency, and the processing process analyzes the unreasonable data, and retains the working signal of the drive shaft in the road spectrum data by ignoring the reasonable data during the processing; The method specifically comprises: firstly finding data beyond the allowable range of the device, averaging the data beyond the allowable range of the device with the data at the next moment, and if the average value is within the allowable range of the device, then calculating the data beyond the allowable range of the device with the data at the next moment, and outputting the average value; If it is not within the range allowed by the device, the average value is calculated downward until the average value obtained is within the range allowed by the device and then output.

2. The data processing method based on the Lupu bench test machine according to claim 1 is characterized in that: The drive shaft is a drive shaft component in a vehicle drive shaft system, and its working signal data includes swing angle, rotation speed, torque, and up and down vibration.

3. The data processing method based on the Lupu bench test machine according to claim 1 is characterized in that: The unreasonable data is manually set according to the allowable working conditions of the durability testing machine equipment, so that the data processed by the method is the final data that meets the allowable working conditions of the durability testing machine equipment.

4. The data processing method based on the Lupu bench test machine according to claim 1 is characterized in that: The working signal data of the drive shaft is a sequence formed by the sampling time and the value of each working signal at the time point, the sampling interval between each value in the sequence is 0.01 second, the limit range of the allowable torque M of the drive shaft device is -4000Nm≤M≤4000Nm, and the limit range of the allowable torque change speed Ms is -600Nm / s≤Ms≤600Nm / s; The method only processes the torque M and the torque change speed Ms that are beyond the limit range.

5. The data processing method based on the Lupu bench test machine according to claim 4 is characterized in that: In the method, if the torque exceeds the limit range allowed by the device but the excess is negligible, the torque is adjusted to the upper limit or lower limit of the limit range; when calculating the unreasonable torque change speed Ms, the torque acceleration of the period is calculated by the provided time and torque information, and the calculation formula is as follows: Ms n+1 =(M n+1 -M n ) / (t n+1 -t n ) Formula 1; where Ms is the moment acceleration; M is the moment; t is time; n is the sequence number; Calculate the torque change speed of each group in the sequence in sequence; The processing flow of the downward averaging method includes the following processes: In process A1, n increases from 2. If the value is within the allowed range of the device, the value is output; Process A2: If the value corresponding to n in process A1 is not within the range allowed by the device, locate the next data corresponding to the next sequence number and calculate the average with the next data; Process A3: If the calculation result of process A3 is not within the range, it will not be output, and the average calculation will continue until the calculation result is within the range, and then it will be uniformly output as the average value.

6. The data processing method based on the Lupu bench test machine according to claim 5 is characterized in that: In process A1, if n is 2, then Ms2=Ms2; then turn to the data corresponding to the next sequence number for processing; in process A2, if n is originally 3, then change it to 4, That is, if the calculation result is within the allowed range of the device, it will be output; In process A3, n is taken as 5, If the result is still out of range, then n is set to 6. If the calculation result is still out of range, then n is set to 7 and the calculation is continued, and so on, until the calculation result is within the allowable range of the device.

7. The data processing method based on the Lupu bench test machine according to claim 5 is characterized in that: The method outputs the driving shaft working data of the road test in process A1, process A2 and process A3. When the output value of each process needs to be verified, the following formula is used for verification: M n+1 =M n +Ms n+1 ×(t n+1 -t n ) In the formula, Ms is the torque acceleration; M is the torque; t is the time; n is the sequence number, and the torque change speed of each group in the sequence is calculated in turn.

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