CN103606105A - Method and system for reliability check and evaluation index statistics of engineering agricultural full-set machinery product - Google Patents

Abstract

The present invention relates to a statistical method and system for assessing and assessing indicators of engineering agricultural machine product reliability, which is divided into S1, randomly sampling from the products that pass the inspection of the manufacturer; S2, recording multiple representative operating time and fault categories and the interlock button for stopping work is installed near the control handle of the prototype; S3, the operator presses the corresponding button according to the working conditions of the prototype, and the recording device calculates the working time, distinguishes the fault type and counts the number of faults; S4, the recording device and The remote monitoring center communicates through the wireless mobile communication network to realize the remote transmission of test data; S5, after the test time is over, the inspectors calculate and evaluate the evaluation indicators such as the average time to failure before the first failure and the average time between failures based on the data stored in the remote monitoring center . The invention can effectively remotely track the test prototype, reduce the work intensity of the inspectors, and improve the consistency and accuracy of data.

Description

Statistical method and system for product reliability assessment and evaluation index of engineering agricultural machinery

technical field

The invention relates to a statistical method and system for product reliability assessment and evaluation indicators, and the application object is the complete engineering agricultural machinery.

Background technique

Engineering agricultural machinery products refer to mechanical products used for agricultural engineering operations and agricultural field operations, such as agricultural loaders, agricultural excavators for agricultural engineering operations, tractors, harvesters, etc. for agricultural field operations. Working time refers to the running time for completing the work, including the time for engineering agricultural machinery load operation, turning time at the headland, loading and unloading time, and refueling and watering time.

The reliability of engineering agricultural machinery products has always been a major issue related to the quality of its actual operation, the interests of users and the survival of enterprises. According to the national standard "Engineering Agricultural Machinery Product Reliability Evaluation Index System and General Rules for Fault Classification", the reliability evaluation index should be able to quantitatively measure the reliability of the use under the specified conditions. These data are important basis for reliability evaluation and product reliability improvement.

At present, reliability data generally come from on-site reliability tests, that is, in combination with the actual use of the product, on-site reliability tests or fixed-point tracking on-site reliability tests are conducted under the supervision of special personnel; laboratory or proving ground reliability tests are performed by test personnel, According to the reliability test specification, the reliability test is carried out in the laboratory under controllable conditions or in the test field under the specified conditions; the user survey is carried out among the users of the product to obtain the reliability data of the actual use of the product. Among these methods, the data from field reliability test is the most direct, effective and reliable. However, there are many types of engineering agricultural machinery products, harsh operating environment, and extremely poor field test conditions, and it is almost impossible to send special inspectors to follow up the test for a long time (about 1 year). Moreover, due to human factors, the consistency of the data is relatively low. Difference.

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is to propose a statistical method of reliability assessment indicators and design a corresponding system to realize remote transmission of data through wireless mobile communication technology to realize remote monitoring of assessment indicators and achieve effective long-term tracking of field experiments The purpose is to provide more consistent and accurate data for product reliability evaluation and reliability improvement.

(2) Technical solution

In order to solve the above-mentioned technical problems, the present invention proposes a statistical method of reliability assessment index, and the specific steps include:

S1. Sampling of complete engineering agricultural machinery products: the test prototype is selected from the qualified products inspected by the inspection department of the manufacturer, and random sampling is adopted. The sampling quantity is generally 10% of the annual output;

S2, the installation of recording device with the functions of operation time calculation, fault category judgment and fault count statistics: there are multiple buttons in the recording device with interlocking functions representing the operation status, fault type or stop working, etc., which are installed on the operating handle Nearby, the failure category includes at least one of general failure, serious failure or fatal failure;

S3, recording of operation time and number of failures: the operator presses the operation status button, the operation timing function in the recording device is triggered, presses a certain failure category button, and the function of counting the number of failures in the recording device is triggered. The interlocking function between the buttons, the job timing is suspended, press the stop button, all the buttons pop up, and the timing and counting functions are suspended

S4, Remote transmission of test data: Two-way communication is carried out between the recording device and the remote monitoring center. After receiving a single called instruction, upload the current recorded data once, or receive a timing function instruction, and upload the data immediately when the timing is reached, or for the first time Upload data immediately when a fault is triggered. The test data mainly includes the ID number of the prototype, system time, cumulative operating time, fault type and number of faults, latitude and longitude of the operating location, and operating speed;

S5, Statistics, calculation and evaluation of assessment indicators: After the test time is over, the testing personnel will perform statistical calculation of assessment indicators according to formulas (1) and (2) according to the uploaded data:

Average operating time before first failure $\mathrm{MTTFF}=\frac{1}{r}(\underset{i=1}{\overset{r}{\mathrm{\Σ}}}{t}_i+\underset{j=1}{\overset{\mathrm{no}-r}{\mathrm{\Σ}}}{t}_j)---\left(1\right)$

Among them, n is the effective number of statistics of the first failure in the tested sample

r is the number of products with the first failure among the tested samples

t _i is the cumulative working time when the first failure of the i-th sample occurs, in hours (h)

t _j is the cumulative working time of the jth sample without the first failure at the end of the reliability test, in hours (h)

mean time between failures $\mathrm{MTBF}=\frac{\underset{i=1}{\overset{\mathrm{no}}{\mathrm{\Σ}}}{t}_{\mathrm{ci}}}{r_a}---\left(2\right)$

Among them, n is the effective number of statistics of the first failure in the tested sample

t _ci is the cumulative working time of the i-th test prototype, in hours (h)

r _a is the sum of the number of on-site failures of the tested prototype within the test time

Realize that the recording device in the above steps mainly includes:

A key switch with multiple interlocking keys, each of which represents one of working status, fault category, or stop working;

GPS unit, to obtain the system time, latitude and longitude of the work site and work speed, and provide a basis for the reliability of the test data;

The processing unit is mainly composed of a microprocessor or a single-chip microcomputer, including peripheral circuits, and is the core of the entire recording device. It is mainly used to calculate the working time according to the state of the corresponding key of the key switch, and count the fault category and the corresponding fault times. Analyze the system time, latitude and longitude of the work location and work speed;

The storage unit is connected with the processing unit and is used to store the accumulated operating time, fault category and accumulated fault times;

The wireless communication unit is connected with the processing unit to transmit the test data to the remote monitoring center;

The display unit is connected with the processing unit to display test data;

The power supply unit supplies power to other units in the recording device, and is connected to the storage battery in the test prototype at the same time, and is charged by the storage battery.

The remote monitoring center mainly includes:

The wireless mobile communication device communicates with the wireless communication unit in the recording device in a network for remote data transmission;

The computer and the processing software in the computer are connected with the wireless mobile communication device for sending control instructions, analyzing test data, displaying, storing, and monitoring geographical information.

(3) Beneficial effects

The method and system for counting the reliability evaluation indicators of engineering agricultural machinery products designed by the present invention realizes the calculation of operation time, statistics of fault types and fault times through the recording device placed in the prototype machine, and realizes remote transmission of data by using wireless mobile communication technology , the statistics, calculation and evaluation of assessment objectives can be realized by the remote monitoring center, which can effectively track the test prototype remotely, greatly reduce the work intensity of the test personnel, and improve the consistency of the test data; the interlocking of the key switches in the recording device makes each The state of each test is unique, which simplifies the operation steps and ensures the accuracy of the test data; the reliability of the data is further improved by collecting the system time, latitude and longitude of the work site and work speed through the GPS unit.

Description of drawings

Fig. 1 is a flow chart of the statistical method for evaluating and assessing the product reliability of engineering agricultural machinery products according to an embodiment of the present invention.

Figure 2 is a schematic diagram of the structure of the recording device in the statistical system for the reliability assessment and evaluation index of the whole engineering agricultural machinery product.

Figure 3 is a schematic diagram of the system scheme for the reliability assessment and evaluation index statistics system of complete engineering agricultural machinery products.

Symbols in the figure: 1, key switch, 101, working time button, 102, general failure button, 103, serious failure button, 104, fatal failure button, 105, stop working button, 2, processing unit, 3, display unit, 4. GPS unit, 401, GPS antenna, 5. Wireless communication unit, 501, communication antenna, 6. Storage unit, 7. Power supply unit

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Fig. 1 is the flow chart of the statistical method for the reliability assessment and evaluation index of the complete engineering agricultural machinery product of the embodiment of the present invention, and the whole process is as follows.

S1. The complete engineering and agricultural machinery to be tested is randomly sampled from the qualified products inspected by the inspection department of the manufacturer.

S2, the installation of a recording device with the functions of calculation of working time, judgment of fault type and statistics of fault times. The structural schematic diagram of the recording device is shown in Figure 2, which mainly includes:

A key switch 1 with a plurality of interlocking keys, each key represents a function, where key 101 represents operating time, key 102 represents general faults, key 103 represents serious faults, key 104 represents fatal faults, and key 105 represents stop working ;

The core processing unit 2 of the recording device is mainly composed of a microprocessor or a single-chip microcomputer, including peripheral circuits, which are connected with each key of the key switch 1, and are used to calculate the working time, judge the fault type and count the corresponding according to the state of the key. The number of failures, and also analyze the system time, latitude and longitude of the work site and work speed from the GPS unit;

The display unit 3 is used to display the operation time calculated by the processing unit 2, the type of failure and the corresponding number of failures, system time, latitude and longitude coordinates and operation speed;

GPS unit 4, including GPS antenna 401, is used to collect system time, longitude and latitude and operating speed of the operating site where the test is located, and provides a basis for the reliability of the test data;

A wireless communication unit 5, including an antenna 501, configured to transmit the data integrated by the processing unit 2 to a remote monitoring center;

The storage unit 6 is used to store the cumulative operating time or fault type and cumulative fault times calculated by the processing unit 2;

The power supply unit 7 supplies power to other units in the recording device, and is connected to the storage battery in the test prototype at the same time, and is charged by the storage battery;

Since the key switch 1 needs to be manually operated, it can be placed near the joystick of the prototype for the convenience of operating the mobile phone.

S3, the operator presses the button representing the corresponding function in the recording device according to the operation situation, and the recording device automatically calculates the corresponding operation time, judges the type of fault and counts the number of faults.

When the prototype starts to work, the operator presses the key 101 representing the working time in the key switch 1 while the operating handle starts to work, and the processing unit 2 detects that the level of the pin connected to the key 101 changes, and starts Timing; if one of general failure, serious failure or fatal failure occurs during the operation, the operator only needs to press the general failure button 102, the serious failure button 103 or the fatal failure button 104 while stopping the work, Due to the interlocking effect between the keys, the keys 101 will all be bounced, the processing unit 2 will stop the operation time counting, and the corresponding failure times will be increased by 1; When the button 105 is pressed, the operation time counting stops, and the accumulated operation time, fault type and corresponding fault times calculated by the processing unit 2 are stored in the storage unit 6 .

S4, the remote monitoring center communicates with the recording device through the wireless mobile communication network, and performs remote transmission of test data. The N recording devices in the N prototypes and the remote monitoring center form a star network structure, as shown in Figure 3. The monitoring center performs remote communication and data transmission with the recording device through the wireless mobile device according to the set communication protocol. The communication method can be It is a single call. When you need to check the data in a recording device, you only need to send an instruction to it. After receiving the instruction, the recording device will send the device ID number, system time, cumulative operation time, fault type and The latitude and longitude of the location and the operation speed are returned to the monitoring center. The communication method can also be uploaded regularly by the recording device, and the time can be set remotely by the monitoring center. In addition, the communication method can also be the first fault trigger upload data. When one of the fault types occurs, the key switch When the corresponding button is pressed, the recording device actively uploads the data at this time to the remote monitoring center.

S5, the inspector performs statistics, calculation and evaluation on the reliability index to be assessed according to the data stored in the remote monitoring center. The software installed in the computer in the remote monitoring center analyzes, displays and stores the device ID number, system time, cumulative operating time, fault type and fault times, longitude and latitude of the operating location and operating speed according to the data returned by the wireless mobile communication device. Since this software has a geographic information monitoring module, the operating location of each test prototype is also displayed on the software map; when the specified test time is over, the inspectors will count the effective number n of the first failure based on the stored test data, and the occurrence The number r of products with the first failure, the cumulative working time t _i (unit hour, h) when the i-th sample has the first failure, the cumulative working time t _j of the j-th sample that did not have the first failure at the end of the reliability test, Calculate the average working time before the first failure according to the following formula:

Average operating time before first failure

Inspectors also need to count the cumulative working time t _ci (unit hour, h) of the i-th test prototype and the sum of the number of on-site failures r _a of the tested prototype within the test time, and calculate the average time between failures according to the following formula:

mean time between failures

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by the claims.

Claims (4)

1. a kind of engineering agricultural machinery complete machine product reliability assessment index statistical method, it is characterized in that, described step comprises: S1, randomly select the engineering prototype to be tested from the qualified products inspected by the inspection department of the manufacturer; S2, installing a plurality of buttons in the recording device with interlocking functions representing the working time, fault category and stop working near the operating handle, and the device needs to be connected with the battery in the prototype, and the battery will charge it; The above fault categories include at least one of general faults, serious faults or fatal faults; S3, the operator presses the corresponding button according to the working conditions of the prototype, and the recording device calculates the working time, distinguishes the fault type and counts the number of faults; presses the working state button, the operation timing function in the recording device is triggered, press When a button of a fault category is pressed, the function of counting the number of faults in the recording device is triggered. At the same time, due to the interlocking effect between the buttons, the operation timing is suspended. When the stop button is pressed, all the buttons pop up, and the timing and counting functions are suspended; S4, the recording device communicates with the remote monitoring center through a wireless mobile communication network to realize remote transmission of test data; after receiving a single called instruction, the recording device uploads the current recorded data once, or receives a timing function instruction, and the timing is up immediately Upload data, or upload data immediately when the first fault is triggered; test data mainly includes prototype ID number, system time, cumulative operating time, fault type and number of faults, latitude and longitude of the operating location, and operating speed; S5. After the test time is over, the inspectors calculate and evaluate the assessment indicators according to the data stored in the monitoring center; assuming that the effective number n of the first failure is counted from the data, the number r of products with the first failure, and the i-th sample The cumulative working time t _i (unit hour, h) when the first failure occurs, and the cumulative working time t _j (unit hour, h) of the jth sample without the first failure at the end of the reliability test, the average working time before the first failure time

Inspectors also need to count the cumulative working time t _ci (unit hour, h) of the i-th test prototype and the sum of the number of on-site failures r _a of the tested prototype within the test time, then mean time between failures

2. A system for realizing the statistical method for the reliability assessment and evaluation index of engineering agricultural machinery products, characterized in that the system includes a recording device installed in the prototype and a remote monitoring center. 3. A recording device for realizing claim 2, wherein said device mainly comprises: A key switch having a plurality of interlocking keys, each of which represents one of working status, fault category or stop working; The GPS unit that obtains the system time, the latitude and longitude of the operating location and the operating speed provides a basis for the reliability of the test data; The processing unit is mainly composed of a microprocessor or a single-chip microcomputer, including peripheral circuits, and is the core of the entire recording device. It is mainly used to calculate the working time, determine the type of failure and calculate the corresponding number of failures according to the state of the corresponding key in the key switch. Also analyze the system time, the latitude and longitude coordinates of the work site and the work speed from the GPS unit; A storage unit, connected to the processing unit, for storing accumulated operating time, fault category and accumulated fault times; A wireless communication unit, connected to the processing unit, transmits test data to a remote monitoring center; a display unit connected to the processing unit to display test data; The power supply unit supplies power to other units in the recording device, and is connected to the battery in the test prototype at the same time, and is charged by the battery. 4. A remote monitoring center realizing claim 2, characterized in that said monitoring center mainly comprises: A wireless mobile communication device communicates with the wireless communication unit in the recording device in a network to perform remote data transmission; The computer and the processing software in the computer are connected with the wireless mobile communication device for sending control commands, analyzing test data, displaying, storing, and monitoring geographical information.

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