WO2020124941A1 - Real-time online prediction method for service life of fan - Google Patents

Real-time online prediction method for service life of fan Download PDF

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WO2020124941A1
WO2020124941A1 PCT/CN2019/086690 CN2019086690W WO2020124941A1 WO 2020124941 A1 WO2020124941 A1 WO 2020124941A1 CN 2019086690 W CN2019086690 W CN 2019086690W WO 2020124941 A1 WO2020124941 A1 WO 2020124941A1
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fan
life
service life
time period
time
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PCT/CN2019/086690
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French (fr)
Chinese (zh)
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姚瑱
余国军
钱巍
徐小军
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南京埃斯顿自动化股份有限公司
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/001Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/008Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00Function
    • F05D2260/82Forecasts

Definitions

  • the invention relates to a fan life prediction method, in particular to a real-time online prediction method of fan life.
  • the patents and papers currently involved are not directly used to calculate and display the life of the cooling fan in real time.
  • the traditional methods for evaluating the life of the fan include two types: one is to perform accelerated life tests on multiple samples, analyze the experimental results and The curve is drawn, and finally the life of the fan in the actual environment is obtained; the other is to sample and compare the fan current, speed and noise in real time, and it is regarded as failure when the threshold is exceeded.
  • the Chinese invention patent "Fan Life Prediction Method” (Authorization Bulletin No. CN102080648B) discloses a fan life prediction method for accelerated life testing of multiple samples, based on multiple samples of the fan to perform accelerated aging tests in a specific environment Then, the data obtained through the experiment is used to draw the curve, and the life of the fan at the corresponding temperature is obtained by using the Wechsler model for data analysis. Finally, the life of these fans at the actual operating temperature is calculated through the acceleration factor. This experiment is complicated to implement and requires a long period.
  • the purpose of the present invention is to overcome the shortcomings of the prior art and propose a real-time online prediction method for the life of the fan. Based on the fan life model, according to the actual ambient temperature of the fan operation, the life-time loss acceleration ratio and the remaining life percentage of the fan are calculated in real time.
  • the technical solution for realizing the object of the present invention is: a real-time online prediction method for the life of a fan, and the steps are as follows:
  • Step 1 Directly measure or indirectly obtain the real-time ambient temperature of fan operation through calculation.
  • Step 2 Calculate the average operating environment temperature T use of the fan in ⁇ t using a period of time ⁇ t in the process of fan use as a time period.
  • Step 3 According to the following formula, find the life L x of the fan at the corresponding temperature within a time period ⁇ t.
  • shape parameter of the distribution model
  • L 10 the life of the fan at the nominal rated temperature (that is, the expected life of the fan with a 10% failure)
  • T rated the nominal rated operating environment temperature of the fan
  • A each increase in temperature 10 °C, the acceleration factor of fan life loss
  • Step 4 Set the life of the fan in the first factory operation to 1, calculate the percentage of a time period ⁇ t in the whole life process according to the life L x obtained in step 3, and use the remaining life after the previous time period to reduce The percentage of the entire life span that goes to this time period is the predicted remaining life of the fan.
  • the following formula is the formula for calculating the life L R after the end of the Nth time period:
  • L R reaches the threshold
  • L R performs the corresponding operation.
  • early warning and alarm thresholds can be set. When the early warning threshold is reached, an early warning reminder is needed to replace the fan, but the entire system does not stop; when the alarm threshold is reached, the alarm is stopped and the user is reminded to replace the fan immediately.
  • the method of the present invention calculates the fan life loss acceleration ratio and the remaining life percentage in real time, and promptly issues warnings or shuts down and replaces the fan according to the remaining percentage of the fan life, In the case of ensuring the reliability of the fan, the maximum use of the fan not only improves the reliability of the entire system, but also saves the maintenance cost to the greatest extent.
  • the advantages of the present invention are as follows: (1) The calculation process of the present invention fully considers the influence of the fan environmental temperature change on its life loss acceleration ratio, which can change the fan working environment. In the occasion, the remaining life of the fan is calculated more accurately; (2) The present invention can calculate and display the remaining life percentage of the fan in real time, and the user can understand the usage of the fan in real time.
  • Figure 1 is a block diagram of the method of the present invention.
  • the implementation example is as follows:
  • the real-time online prediction method for the life of the fan mainly includes the following steps:
  • Step 1 Direct measurement or indirect calculation to obtain the real-time ambient temperature of fan operation.
  • Step 2 Take 1 hour in the process of using the fan as a time period, assuming that the average operating environment temperature T use of the fan in this 1 hour is 60°C.
  • Step 3 According to the following formula, find the service life L x of the fan operating at an ambient temperature of 60°C.
  • Step 4 Set the life of the fan in the first factory operation to 1, calculate the percentage of a time period ⁇ t in the entire life process based on the obtained life L x , and subtract the remaining life after the previous time period from this A time period accounts for the percentage of the entire life.
  • the following formula is the calculation formula for the life L R after the end of the Nth time period:
  • the remaining life of the fan after the first 999 hours is 90%
  • the average operating temperature of the fan in the first 1000 hours is 60°C
  • the remaining life of the fan after the first 1000 hours is :
  • the corresponding life alarm threshold when L R reaches the threshold, perform the corresponding operation.
  • the early warning can be set to 10%, and the alarm threshold is 0.
  • the alarm threshold When the early warning threshold is reached, an early warning reminder is needed to replace the fan, but the entire system does not stop.
  • the alarm threshold When the alarm threshold is reached, it will alarm and stop to remind the user to replace the fan immediately.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A real-time on-line prediction method for the service life of a fan. Said method comprises: obtaining an operating environment temperature of a fan in real time; by taking a period of time Δt during the use of the fan as a time period, calculating an average working environment temperature Tuse of the fan within Δt; calculating the service life Lx of the fan at a corresponding temperature within the time period Δt; setting the service life of the fan of the first factory operation to be 1, calculating the percentage of the time period Δt in the entire service life according to the service life Lx, and subtracting the percentage of this time period in the entire service life from the remaining service life after a previous time period elapses, i.e. predicting the remaining service life of the fan. The online prediction method takes into account the influence of the environment temperature change of a fan on a service life discount acceleration ratio thereof, being able to more accurately calculate the remaining service life of the fan when the fan operating environment changes, and to calculate and display the percentage of the remaining service life of the fan in real time, and a user can check the usage of the fan in real time.

Description

一种风扇寿命的实时在线预测方法Real-time online prediction method of fan life 技术领域Technical field
本发明涉及一种风扇寿命的预测方法,具体说是一种风扇寿命的实时在线预测方法。The invention relates to a fan life prediction method, in particular to a real-time online prediction method of fan life.
背景技术Background technique
随着工业自动化的飞速发展,交流运动控制系统以及其他大型电子系统集成度和功率密度也越来越高,所有的电子设备或者电子器件的寿命以及抗冲击能力都与环境温度息息相关,散热自然成为一个系统非常重要的问题。强迫风冷具有经济、可靠、使用和安装方便等优点广泛应用于工业的各个领域,然而实现强迫风冷的风扇也具有一定的寿命周期,如果在风扇失效之前不能及时进行更换,势必会降低整个系统的散热能力,从而导致整个系统的寿命下降,造成不必要的损失。With the rapid development of industrial automation, the integration and power density of AC motion control systems and other large electronic systems are getting higher and higher. The life span and impact resistance of all electronic equipment or electronic devices are closely related to the ambient temperature, and heat dissipation naturally becomes A very important issue for a system. Forced air cooling has the advantages of economy, reliability, ease of use and installation, and is widely used in various fields of industry. However, fans that implement forced air cooling also have a certain life cycle. If the fan cannot be replaced in time before the fan fails, it will inevitably reduce the entire The heat dissipation capacity of the system leads to a reduction in the life of the entire system, causing unnecessary losses.
风扇在运行过程中,伴随着其内部润滑剂蒸发、氧化、损耗,风扇自身轴承摩擦将会加剧,风扇的损耗会进一步上升,最终导致风扇失效。目前对于判定风扇失效的方法和标准有很多,应用比较广泛的标准有以下几条:(1)当风扇启动电压大于其原始启动电压1.1倍及其以上认为风扇失效。(2)当风扇电流超过其初始电流20%认为失效。(3)当风扇转速超过初始转速的±20%,认为失效。(4)当风扇的噪音大±于原始噪音5db认为失效。During the operation of the fan, along with its internal lubricant evaporation, oxidation, and loss, the friction of the fan's own bearings will increase, and the loss of the fan will further increase, eventually causing the fan to fail. At present, there are many methods and standards for determining the failure of the fan, and the more widely used standards are as follows: (1) When the fan starting voltage is greater than its original starting voltage by 1.1 times or more, the fan is considered to be invalid. (2) When the fan current exceeds 20% of its initial current, it is considered to be invalid. (3) When the fan speed exceeds ±20% of the initial speed, it is considered invalid. (4) When the noise of the fan is greater than ± 5db of the original noise, it is considered invalid.
目前所涉及的专利和论文中没有直接用于实时计算和显示冷却风扇寿命的,传统的评估风扇寿命的方法包括两种:一种是对多个样品进行加速寿命试验,对实验结果进行分析和曲线拟定,最后得到风扇在实际环境中的寿命;另一种是实时地对风扇电流、转速和噪声进行采样对比,当超出阀值时视为失效。The patents and papers currently involved are not directly used to calculate and display the life of the cooling fan in real time. The traditional methods for evaluating the life of the fan include two types: one is to perform accelerated life tests on multiple samples, analyze the experimental results and The curve is drawn, and finally the life of the fan in the actual environment is obtained; the other is to sample and compare the fan current, speed and noise in real time, and it is regarded as failure when the threshold is exceeded.
中国发明专利《风扇寿命的预估方法》(授权公告号CN102080648B),公开了一种多个样品进行加速寿命试验的风扇寿命预估方法,基于多个样品风扇在特定的环境下进行加速老化试验,再通过实验得到的数据进行曲线拟定,并采用韦氏模型进行数据分析求出对应温度下风扇的寿命,最后再经由加速因子计算出这些风扇在实际工作温度下的寿命。此实验实现起来比较复杂需要周期长,其仅是对所测风扇的在一定的工作温度下的实际寿命的估测,并不是将其寿命实时地计算出来;实际上在很多情况下风扇的运行环境是实时发生变化的,通过以上方法计算出的风扇寿命并不能实时正确的反映其随环境温度发生的变化。The Chinese invention patent "Fan Life Prediction Method" (Authorization Bulletin No. CN102080648B) discloses a fan life prediction method for accelerated life testing of multiple samples, based on multiple samples of the fan to perform accelerated aging tests in a specific environment Then, the data obtained through the experiment is used to draw the curve, and the life of the fan at the corresponding temperature is obtained by using the Wechsler model for data analysis. Finally, the life of these fans at the actual operating temperature is calculated through the acceleration factor. This experiment is complicated to implement and requires a long period. It is only an estimate of the actual life of the measured fan at a certain operating temperature, and it is not calculated in real time; in fact, the fan runs in many cases The environment changes in real time, and the fan life calculated by the above method does not accurately reflect its change with ambient temperature in real time.
中国发明专利申请文献《风扇寿命告警的方法和装置》(公开号101074966A),提供了一种根据风扇转速来判断风扇寿命和失效的方法,但实际应用过程中,风扇转速并不是随风扇的寿命呈线性或者成有规律的曲线变化的,而且风扇的失效包括风扇的电流、启动电压以及噪声等多种标准,并不能简简单单的采用风扇的转速作为其对寿命的判断,只能作为其失效和故障的判断。Chinese invention patent application document "Fan Life Alarm Method and Device" (Publication No. 101074966A), provides a method to judge the life and failure of the fan based on the fan speed, but in actual application, the fan speed does not follow the life of the fan It changes linearly or in a regular curve, and the failure of the fan includes a variety of standards such as fan current, starting voltage, and noise. It cannot simply use the fan's speed as its judgment on life, but only as its Judgment of failure and failure.
发明内容Summary of the invention
本发明的目的在于,克服现有技术存在的缺陷,提出了一种风扇的寿命实时在线 预测方法。基于风扇寿命模型,根据风扇运行的实际环境温度,实时计算风扇的寿命折损加速比和剩余寿命的百分比。The purpose of the present invention is to overcome the shortcomings of the prior art and propose a real-time online prediction method for the life of the fan. Based on the fan life model, according to the actual ambient temperature of the fan operation, the life-time loss acceleration ratio and the remaining life percentage of the fan are calculated in real time.
本发明实现发明目的的技术方案是:风扇的寿命实时在线预测方法,其步骤如下:The technical solution for realizing the object of the present invention is: a real-time online prediction method for the life of a fan, and the steps are as follows:
步骤1.直接测量或者间接的通过计算的方式获得实时风扇工作的环境温度。Step 1. Directly measure or indirectly obtain the real-time ambient temperature of fan operation through calculation.
步骤2.以风扇使用过程中的一段时间Δt为一个时间周期,计算Δt内的风扇的平均工作环境温度T useStep 2. Calculate the average operating environment temperature T use of the fan in Δt using a period of time Δt in the process of fan use as a time period.
步骤3.根据以下公式,求出一个时间周期Δt内对应温度下风扇的寿命L xStep 3. According to the following formula, find the life L x of the fan at the corresponding temperature within a time period Δt.
Figure PCTCN2019086690-appb-000001
Figure PCTCN2019086690-appb-000001
α=L 10/(-ln0.9^ 1/β) α=L 10 /(-ln0.9^ 1/β )
Figure PCTCN2019086690-appb-000002
Figure PCTCN2019086690-appb-000002
其中:β:分布模型形状参数;L 10:风扇标称的额定温度下的寿命(即风扇发生10%不良的预期寿命);T rated:风扇标称的额定工作环境温度;A:温度每增加10℃,风扇寿命折损的加速因子;n:样本数,在这里n=1。 Among them: β: shape parameter of the distribution model; L 10 : the life of the fan at the nominal rated temperature (that is, the expected life of the fan with a 10% failure); T rated : the nominal rated operating environment temperature of the fan; A: each increase in temperature 10 ℃, the acceleration factor of fan life loss; n: the number of samples, where n=1.
步骤4.设定风扇在第一次出厂运行时的寿命为1,根据步骤3求得的寿命L x计算出一个时间周期Δt在整个寿命过程的百分比,用前一个时间周期之后剩余的寿命减去这一个时间周期占整个寿命的百分比,即为预测风扇剩余寿命。下式为第N个时间周期结束后的寿命L R计算公式: Step 4. Set the life of the fan in the first factory operation to 1, calculate the percentage of a time period Δt in the whole life process according to the life L x obtained in step 3, and use the remaining life after the previous time period to reduce The percentage of the entire life span that goes to this time period is the predicted remaining life of the fan. The following formula is the formula for calculating the life L R after the end of the Nth time period:
Figure PCTCN2019086690-appb-000003
Figure PCTCN2019086690-appb-000003
根据需求,设定相应的寿命报警阈值,当L R到达阈值时,执行相应的操作。比如:可以设定预警和报警阈值,当到达预警阈值时,发出预警提醒需要更换风扇,但整个系统不停机;当到达报警阈值时,报警,停机,提醒用户立刻更换风扇。 According to demand, set the corresponding life alarm threshold, when L R reaches the threshold, perform the corresponding operation. For example: early warning and alarm thresholds can be set. When the early warning threshold is reached, an early warning reminder is needed to replace the fan, but the entire system does not stop; when the alarm threshold is reached, the alarm is stopped and the user is reminded to replace the fan immediately.
本发明方法,基于风扇寿命模型,根据风扇运行的实际环境温度,实时计算风扇的寿命折损加速比和剩余寿命的百分比,并根据风扇寿命的剩余百分比及时的发出警告或者停机更换风扇等指令,在保证风扇可靠地情况下,最大限度的使用风扇,既提高了整个系统的可靠性,同时也最大限度的节约了维护成本。相比于现有的风扇的寿命获取方法,本发明的优势如下:(1)本发明计算过程中充分考虑了风扇环境温度变化对其寿命折损加速比的影响,能够在风扇工作环境变化的场合更准确的计算出风扇的剩余寿命;(2)本发明能够实时计算和显示风扇的剩余寿命百分比,用户可以实时的了解风扇的使用情况。The method of the present invention, based on the fan life model, based on the actual ambient temperature of the fan operation, calculates the fan life loss acceleration ratio and the remaining life percentage in real time, and promptly issues warnings or shuts down and replaces the fan according to the remaining percentage of the fan life, In the case of ensuring the reliability of the fan, the maximum use of the fan not only improves the reliability of the entire system, but also saves the maintenance cost to the greatest extent. Compared with the current fan life acquisition method, the advantages of the present invention are as follows: (1) The calculation process of the present invention fully considers the influence of the fan environmental temperature change on its life loss acceleration ratio, which can change the fan working environment. In the occasion, the remaining life of the fan is calculated more accurately; (2) The present invention can calculate and display the remaining life percentage of the fan in real time, and the user can understand the usage of the fan in real time.
附图说明BRIEF DESCRIPTION
图1是本发明方法流程框图。Figure 1 is a block diagram of the method of the present invention.
具体实施方式detailed description
下面结合实施例,对本发明作进一步详细说明。The present invention will be further described in detail below in conjunction with embodiments.
实施例如下:The implementation example is as follows:
假设某款风扇其参数如下:Suppose a fan has the following parameters:
β:分布模型形状参数=1.1β: distribution model shape parameter = 1.1
L 10:风扇标称的额定温度下的寿命(即风扇发生10%不良的预期寿命)=5000小时 L 10 : life of the fan at the nominal rated temperature (that is, the life expectancy of 10% of the fan) = 5000 hours
A:温度每增加10℃,风扇寿命折损的加速因子=2A: Every time the temperature increases by 10℃, the acceleration factor of fan life loss = 2
T rated:风扇标称的额定工作环境温度=25℃ T rated : Fan's nominal rated working ambient temperature = 25℃
按照本发明方法,此风扇的寿命实时在线预测方法主要包括以下步骤:According to the method of the present invention, the real-time online prediction method for the life of the fan mainly includes the following steps:
步骤一:直接测量或者间接的通过计算的方式获得实时风扇工作的环境温度。Step 1: Direct measurement or indirect calculation to obtain the real-time ambient temperature of fan operation.
步骤二:以风扇使用过程中的1小时为一个时间周期,假设获得风扇在这1小时内的平均工作环境温度T use=60℃。 Step 2: Take 1 hour in the process of using the fan as a time period, assuming that the average operating environment temperature T use of the fan in this 1 hour is 60°C.
步骤三:根据以下公式,求出此风扇工作在环境温度为60℃的使用寿命L xStep 3: According to the following formula, find the service life L x of the fan operating at an ambient temperature of 60°C.
Figure PCTCN2019086690-appb-000004
Figure PCTCN2019086690-appb-000004
α=L 10/(-ln0.9^ 1/β) α=L 10 /(-ln0.9^ 1/β )
Figure PCTCN2019086690-appb-000005
Figure PCTCN2019086690-appb-000005
其中:among them:
β:分布模型形状参数=1.1β: distribution model shape parameter = 1.1
L 10:风扇标称的额定温度下的寿命(风扇发生10%不良的预期寿命)=5000小时 L 10 :Fan life at nominal rated temperature of fan (expected life time at which 10% of fans fail) = 5000 hours
A:温度每增加10℃,风扇寿命折损的加速因子=2A: Every time the temperature increases by 10℃, the acceleration factor of fan life loss = 2
T rated:风扇标称的额定工作环境温度=25℃ T rated : Fan's nominal rated working ambient temperature = 25℃
n:样本数,在这里n=1.n: the number of samples, where n=1.
计算可得,风扇在60℃的情况下,风扇使用寿命L x=8796小时 It can be calculated that the service life of the fan L x = 8796 hours at 60°C
步骤四:设定风扇在第一次出厂运行时的寿命为1,根据求出来的寿命L x计算出一个时间周期Δt在整个寿命过程的百分比,用前一个时间周期之后剩余的寿命减去这一个时间周期占整个寿命的百分比,下式为第N个时间周期结束后的寿命L R计算公式: Step 4: Set the life of the fan in the first factory operation to 1, calculate the percentage of a time period Δt in the entire life process based on the obtained life L x , and subtract the remaining life after the previous time period from this A time period accounts for the percentage of the entire life. The following formula is the calculation formula for the life L R after the end of the Nth time period:
Figure PCTCN2019086690-appb-000006
Figure PCTCN2019086690-appb-000006
假设出厂之后的风扇运行了1000个小时,前999个小时之后风扇的剩余寿命为90%,第1000小时风扇的运行平均环境温度为60℃,在第1000小时结束后,风扇运行的剩余寿命为:Assuming that the fan has been running for 1000 hours after leaving the factory, the remaining life of the fan after the first 999 hours is 90%, the average operating temperature of the fan in the first 1000 hours is 60°C, and the remaining life of the fan after the first 1000 hours is :
Figure PCTCN2019086690-appb-000007
Figure PCTCN2019086690-appb-000007
根据需求,设定相应的寿命报警阈值,当L R到达阈值时,执行相应的操作。比如:可以设定预警为10%,报警阈值为0,当到达预警阈值时,发出预警提醒需要更换风扇,但整个系统不停机。当到达报警阈值时,报警,停机,提醒用户立刻更换风扇。 According to demand, set the corresponding life alarm threshold, when L R reaches the threshold, perform the corresponding operation. For example, the early warning can be set to 10%, and the alarm threshold is 0. When the early warning threshold is reached, an early warning reminder is needed to replace the fan, but the entire system does not stop. When the alarm threshold is reached, it will alarm and stop to remind the user to replace the fan immediately.

Claims (1)

  1. 一种风扇的寿命实时在线预测方法,其步骤如下:A real-time online prediction method of fan life, the steps are as follows:
    步骤1.直接测量或者间接的通过计算的方式获得实时风扇工作的环境温度;Step 1. Directly measure or indirectly obtain the real-time ambient temperature of fan operation by calculation;
    步骤2.以风扇使用过程中的一段时间Δt为一个时间周期,计算Δt内的风扇的平均工作环境温度T useStep 2. Calculate the average operating environment temperature T use of the fan in Δt by taking a period of time Δt in the process of fan use as a time period;
    步骤3.根据以下公式,求出一个时间周期Δt内对应温度下风扇的寿命L xStep 3. According to the following formula, find the fan life L x at the corresponding temperature within a time period Δt:
    Figure PCTCN2019086690-appb-100001
    Figure PCTCN2019086690-appb-100001
    α=L 10/(-ln0.9 ^1/β) α=L 10 /(-ln0.9 ^1/β )
    A f=A (Tuse-Trated)/10 A f = A (Tuse-Trated)/10
    其中:β是分布模型形状参数;L 10是风扇标称的额定温度下的寿命;是T rated;风扇标称的额定工作环境温度;A是温度每增加10℃,风扇寿命折损的加速因子;n是样本数,在这里n=1; Where: β is the shape parameter of the distribution model; L 10 is the fan's nominal life at the rated temperature; T rated ; the fan's nominal rated operating ambient temperature; A is the acceleration factor of the fan's life loss every time the temperature increases by 10°C ; N is the number of samples, where n = 1;
    步骤4.设定风扇在第一次出厂运行时的寿命为1,根据步骤3求得的寿命L x计算出一个时间周期Δt在整个寿命过程的百分比,用前一个时间周期之后剩余的寿命减去这一个时间周期占整个寿命的百分比,下式为第N个时间周期结束后的寿命L R计算公式: Step 4. Set the life of the fan in the first factory operation to 1, calculate the percentage of a time period Δt in the whole life process according to the life L x obtained in step 3, and use the remaining life after the previous time period to reduce To take this time period as a percentage of the entire life, the following formula is the calculation formula for the life L R after the end of the Nth time period:
    Figure PCTCN2019086690-appb-100002
    Figure PCTCN2019086690-appb-100002
    L R即为预测风扇剩余寿命。 L R is the predicted remaining life of the fan.
PCT/CN2019/086690 2018-12-21 2019-05-13 Real-time online prediction method for service life of fan WO2020124941A1 (en)

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