CN103968805A - Method for testing and correcting altitude for working of server by virtue of back pressure of fan - Google Patents
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- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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Abstract
Description
技术领域 technical field
本发明涉及计算机通信领域，具体是利用一种利用风扇背压进行服务器工作海拔高度测试修正的方法，来解决服务器因风扇工作导致海拔高度计算精确度较低的问题。 The invention relates to the field of computer communication, and specifically uses a method for testing and correcting the working altitude of a server by using the back pressure of a fan to solve the problem of low calculation accuracy of the altitude of the server due to the work of the fan.
背景技术 Background technique
目前部分软件应用开始应用到海拔高度，因此目前部分服务器用户提出了该方面需求，另外不同海拔高度空气密度发生改变，影响服务器散热状况。 At present, some software applications have begun to be applied to altitudes, so some server users have proposed this aspect. In addition, the air density changes at different altitudes, which affects the heat dissipation of servers.
在不同海拔的地方，空气的密度并不相同，由此所带来的就是散热所需的风量的差别，海拔越高的地区空气密度越小，大气压降低使得空气粘性系数增加，空气分子数就会减少，从而导致传递的热量减少。这是由于空气对流传热是通过分子碰撞传递能量得来的，这样热传递效率就会降低，电子部件的散热性能变得更差。 在5000M的高度上，放热系数比海平面上的值要下降21%，对流散热传递的热量也将下降21%。在10000M的高度上将达到40%。对流散热传递的热量减少将导致产品温升的增加。因此处于高海拔地区的设备散热性降低。数据中心的设备在运行中都会产生热量，由于局部区域的分子数量减少，使发热元件的温度不容易散掉，造成设备局部温升过高，如果散热不及时就会造成部分器件烧坏。 海拔越高，空气越稀薄，绝缘介质的强度就会随之降低，这就会使设备容易放电，致使通常的绝缘距离变得不足。海拔高的地区容易发生凝露，降低电子设备的爬电距离。数据中心电子设备的绝缘器件性能也会下降。 At different altitudes, the density of the air is not the same, which brings about the difference in the air volume required for heat dissipation. The higher the altitude, the lower the air density, and the decrease in atmospheric pressure increases the air viscosity coefficient, and the number of air molecules increases. will decrease, resulting in less heat transfer. This is because air convection heat transfer is obtained by transferring energy through molecular collisions, so that the heat transfer efficiency will be reduced, and the heat dissipation performance of electronic components will become worse. At a height of 5000M, the heat release coefficient will decrease by 21% compared with the value at sea level, and the heat transfer by convective heat dissipation will also decrease by 21%. It will reach 40% at a height of 10000M. The reduction in heat transfer by convection cooling will result in an increase in product temperature rise. Therefore, the heat dissipation of equipment at high altitudes is reduced. The equipment in the data center will generate heat during operation. Due to the reduction of the number of molecules in the local area, the temperature of the heating element is not easy to dissipate, causing the local temperature rise of the equipment to be too high. If the heat dissipation is not timely, some devices will burn out. The higher the altitude, the thinner the air, and the lower the strength of the insulating medium, which will make the equipment easy to discharge, resulting in insufficient insulation distance. Condensation is prone to occur in areas with high altitudes, which reduces the creepage distance of electronic equipment. The performance of insulating devices in data center electronics also degrades.
在海拔较高的地方，就需要服务器的风扇加快转速从而产生更大的风量来对系统进行冷却，避免过热造成的稳定性问题。而在低海拔的地区则可以适当降低转速来节省电能的消耗，并延长风扇的寿命。 At higher altitudes, the fan of the server needs to speed up to generate more air volume to cool the system and avoid stability problems caused by overheating. In low-altitude areas, the speed can be appropriately reduced to save power consumption and extend the life of the fan.
由于上述原因需要对散热方案进行相应修改，以上需求均提出了对海拔高度测量的要求，因大气压强随随海拔高度发生变化，因此可以利用气压计进行海拔高度的测量，在新的服务器开发设计中增加了气压计元件，但因为服务器产品为强制对流散热产品，内部散热风扇组件工作时会造成气压的变化，进而影响海拔高度测量的准确性，需要对气压计读值进行修正，保证海拔高度测量的准确性。 Due to the above reasons, the heat dissipation scheme needs to be modified accordingly. The above requirements all put forward the requirements for altitude measurement. Because the atmospheric pressure changes with the altitude, the barometer can be used to measure the altitude. In the development and design of the new server The barometer component is added in the server product, but because the server product is a forced convection heat dissipation product, the internal cooling fan assembly will cause changes in air pressure when it is working, which will affect the accuracy of the altitude measurement. It is necessary to correct the barometer reading to ensure the altitude Accuracy of measurement.
发明内容 Contents of the invention
本发明是以风扇性能变化规律及气压变化规律作为理论支撑点，通过风扇工作状态检测计算及气压计读数修正来进行海拔高度的高精度读取，具体发明内容可以分为如下两个方面： The present invention takes the fan performance change law and the air pressure change law as the theoretical support points, and performs high-precision reading of the altitude through the detection and calculation of the fan working state and the correction of the barometer reading. The specific invention content can be divided into the following two aspects:
a) 根据风扇性能P-Q曲线及服务器流阻曲线计算风扇工作点，根据风扇风量、风压与转速的变化规律计算确定风扇工作点处背压与风扇转速规律公式，进而测试确认风扇实际工作对大气压强的改变量，该数值与风扇转速相关。 a) Calculate the fan operating point according to the fan performance P-Q curve and the server flow resistance curve, calculate and determine the formula of the back pressure at the fan operating point and the fan speed law according to the changing law of the fan air volume, wind pressure and speed, and then test to confirm that the fan actually works against the atmospheric pressure Strong change, the value is related to the fan speed.
b) 服务器基板管理控制器获取气压计读数及风扇转速信息，根据风扇背压对气压改变量与风扇转速关系公式计算获取气压实际改变量，气压计读数减去该改变量数值则为该处实际外界气压值，利用海拔高度与大气压强关系公式计算获取实际海拔高度。 b) The server baseboard management controller obtains the barometer reading and the fan speed information, and calculates the actual air pressure change according to the relationship formula between the fan back pressure and the air pressure change and fan speed. The outside air pressure value is calculated using the formula for the relationship between altitude and atmospheric pressure to obtain the actual altitude.
具体工作步骤如下： The specific working steps are as follows:
1）搭建平台； 1) Build a platform;
2）测试服务器流阻曲线及风扇P-Q曲线，计算风扇工作点； 2) Test the flow resistance curve of the server and the P-Q curve of the fan, and calculate the working point of the fan;
3）计算风扇背压与风扇转速变化规律； 3) Calculate the change law of fan back pressure and fan speed;
4）确定气压计读数变化量与风扇转速变化规律； 4) Determine the variation of the barometer reading and the variation of the fan speed;
5）读取气压计读数及风扇转速； 5) Read the barometer reading and fan speed;
6）计算气压实际改变量； 6) Calculate the actual change in air pressure;
7）气压计读数修证。 7) Correction of barometer readings.
在平台高端服务器主板安装气压计组件，气压计位于风扇后方；风扇性能曲线与服务器流阻交叉点为风扇实际工作点。 The barometer assembly is installed on the main board of the high-end server of the platform, and the barometer is located behind the fan; the intersection point of the fan performance curve and the server flow resistance is the actual working point of the fan.
服务器BMC读取气压计数值及风扇转速，根据公式计算风扇背压和实际大气压，根据大气压与海拔关系式计算海拔高度。 The server BMC reads the air pressure counter value and fan speed, calculates the fan back pressure and actual atmospheric pressure according to the formula, and calculates the altitude according to the relationship between atmospheric pressure and altitude.
本发明的有益效果是： The beneficial effects of the present invention are:
利用风扇P-Q曲线及服务器流阻曲线确定风扇工作点，并根据风扇风量、风压与转速的变化规律计算确定风扇工作点处背压与风扇转速规律公式，确定了大气压修正量公式，降低了气压值修正的复杂性。 Use the fan P-Q curve and the server flow resistance curve to determine the fan operating point, and calculate and determine the back pressure and fan speed law formula at the fan operating point according to the change law of the fan air volume, wind pressure and speed, and determine the atmospheric pressure correction formula, which reduces the air pressure Complexity of value correction.
根据风扇转速确定气压修正量，并使用气压计读数减去修正量确定外界实际气压值，利用海拔气压变化规律计算获取海拔高度，提高了海拔测量的精确度，对软件应用参量及服务器散热调控提供了更精确的指导。 Determine the air pressure correction amount according to the fan speed, and use the barometer reading to subtract the correction amount to determine the actual air pressure value outside, and use the altitude air pressure change law to calculate the altitude, improve the accuracy of altitude measurement, and provide software application parameters and server heat dissipation control. more precise guidance.
附图说明 Description of drawings
附图1是本发明的量测流程图； Accompanying drawing 1 is measurement flowchart of the present invention;
附图2是风扇性能P-Q曲线及服务器流阻曲线示意图。 Figure 2 is a schematic diagram of the fan performance P-Q curve and the server flow resistance curve.
具体实施方式 Detailed ways
通过以下步骤对本发明作进一步详细叙述， The present invention is described in further detail by the following steps,
具体工作步骤如下： The specific working steps are as follows:
1）搭建grantley平台； 1) Build the grantley platform;
2）测试服务器流阻曲线及风扇P-Q曲线，计算风扇工作点； 2) Test the flow resistance curve of the server and the P-Q curve of the fan, and calculate the working point of the fan;
3）计算风扇背压与风扇转速变化规律； 3) Calculate the change law of fan back pressure and fan speed;
4）确定气压计读数变化量与风扇转速变化规律； 4) Determine the variation of the barometer reading and the variation of the fan speed;
5）读取气压计读数及风扇转速； 5) Read the barometer reading and fan speed;
6）计算气压实际改变量； 6) Calculate the actual change in air pressure;
7）气压计读数修证。 7) Correction of barometer readings.
grantley平台高端服务器主板安装气压计组件，气压计位于风扇后方。风扇 The high-end server motherboard of the Grantley platform is equipped with a barometer assembly, and the barometer is located behind the fan. fan
性能曲线与服务器流阻交叉点为风扇实际工作点。 The intersection point of the performance curve and the server flow resistance is the actual working point of the fan.
a)测量风扇性能P-Q曲线及服务器流阻曲线，计算获取风扇工作点信息； a) Measure fan performance P-Q curve and server flow resistance curve, calculate and obtain fan operating point information;
b)根据风扇P-Q曲线随风扇转速变化规律确定服务器内部风扇背压与风扇转速规律公式，进而确定气压计读数变化量与风扇转速规律公式。 b) According to the change law of fan P-Q curve with fan speed, determine the formula of fan back pressure and fan speed law inside the server, and then determine the change of barometer reading and the formula of fan speed law.
c) 服务器工作时，基板管理控制器读取气压计读数及风扇转速信息。 c) When the server is working, the baseboard management controller reads the barometer reading and fan speed information.
d) 计算气压实际改变量，气压计读数减去该改变量获得真实外界气压值。 d) Calculate the actual change in air pressure, and subtract the change from the barometer reading to obtain the real outside air pressure.
e) 利用海拔高度与大气压强关系公式计算获取实际海拔高度。 e) Use the formula for the relationship between altitude and atmospheric pressure to obtain the actual altitude.
在系统工作时，服务器搭配风扇背压(Pa)与转速（PWM）关系为：Pfan=2*10-6*PWM2+0.0039*PWM-10。排除外界干扰，大气压(Pa)与海拔(h)的关系为P=101300-10h，气压计位于风扇后部，读数为Pread=P+Pfan，服务器搭配风扇最大转速10000转，系统中工作时风扇背压277Pa，如不进行修正，风扇最大转速时海拔高度误差达到277米。修正过程为：服务器BMC读取气压计数值及风扇转速，根据公式计算风扇背压Pfan和实际大气压P=Pread-Pfan，根据大气压与海拔关系式计算海拔高度为：h=(101300-P)/10。 When the system is working, the relationship between server fan back pressure (Pa) and speed (PWM) is: P fan =2*10 -6 *PWM 2 +0.0039*PWM-10. Excluding external interference, the relationship between atmospheric pressure (Pa) and altitude (h) is P=101300-10h, the barometer is located at the rear of the fan, the reading is P read =P+P fan , the server is equipped with a fan with a maximum speed of 10000 rpm, and the system works When the fan back pressure is 277Pa, if no correction is made, the altitude error at the maximum fan speed will reach 277 meters. The correction process is: the server BMC reads the air pressure count value and the fan speed, calculates the fan back pressure P fan and the actual atmospheric pressure P=P read -P fan according to the formula, and calculates the altitude according to the relationship between atmospheric pressure and altitude: h=(101300- P)/10.
经过上面详细的测试研究确定相关变化规律并利用风扇背压进行气压计读数修正，我们可以获取真实的海拔高度信息，不仅达到了设计的要求，而且提高了海拔高度读取精度。 After the above detailed test and research to determine the relevant change rules and use the fan back pressure to correct the barometer reading, we can obtain the real altitude information, which not only meets the design requirements, but also improves the altitude reading accuracy.
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| CN115289684A (en) * | 2022-06-30 | 2022-11-04 | 芜湖美的智能厨电制造有限公司 | Control method, water heater, and computer-readable storage medium |
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