Mass Metrology Based on Robotic Mass Measurement System

2013 ◽  
pp. 477-484
Author(s):  
Xiaoping Ren ◽  
Changqing Cai ◽  
Yi Li ◽  
Aibin Chen ◽  
Qingxiong Ren
Keyword(s):  
Measurement System ◽  
Mass Measurement

scholarly journals AIR PRESSURE CONTROLLED MASS MEASUREMENT SYSTEM

2013 ◽  
Vol 24 ◽  
pp. 1360002
Author(s):  
RUILIN ZHONG ◽  
JIAN WANG ◽  
CHANGQING CAI ◽  
HONG YAO ◽  
JIN'AN DING ◽  
...  
Keyword(s):  
Measurement System ◽  
Pressure Range ◽  
Mass Measurement ◽  
Air Pressure ◽  
Air Density ◽  
Airtight Chamber ◽  
And Control ◽  
Automatic Mass ◽  
Pressure Controlled ◽  
Control Part

Mass measurement is influenced by air pressure, temperature, humidity and other facts. In order to reduce the influence, mass laboratory of National Institute of Metrology, China has developed an air pressure controlled mass measurement system. In this system, an automatic mass comparator is installed in an airtight chamber. The Chamber is equipped with a pressure controller and associate valves, thus the air pressure can be changed and stabilized to the pre-set value, the preferred pressure range is from 200 hPa to 1100 hPa. In order to keep the environment inside the chamber stable, the display and control part of the mass comparator are moved outside the chamber, and connected to the mass comparator by feed-throughs. Also a lifting device is designed for this system which can easily lift up the upper part of the chamber, thus weights can be easily put inside the mass comparator. The whole system is put on a marble platform, and the temperature and humidity of the laboratory is very stable. The temperature, humidity, and carbon dioxide content inside the chamber are measured in real time and can be used to get air density. Mass measurement cycle from 1100 hPa to 200 hPa and back to 1100 hPa shows the effective of the system.

The Finite Element Analysis in Measurement System of Airplane Fuel Mass

2011 ◽  
Vol 301-303 ◽  
pp. 147-152
Author(s):  
Xiu Wu Sui ◽  
Xiao Guang Qi ◽  
Da Peng Li ◽  
Guo Xiong Zhang ◽  
Yu Ming Fan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Measurement System ◽  
Mass Measurement ◽  
Element Analysis ◽  
Fuel Mass ◽  
The Finite Element Analysis ◽  
Level Sensor ◽  
Level Meter ◽  
Fuel Level

The paper presents the measurement system of the air plane fuel mass consisting of cylinder shell resonating density meter and double cylinders capacitance level meter. The finite element analysis method of ANSYS10.0 is used to analyze the performance of cylinder shell resonator density meter and double cylinders capacitance fuel level sensor. On the base of simulation, the cylinder shell is 45mm in length, 9mm in radius, and 0.08mm in thickness, the material is 3J53; the double cylinders capacitance is 8mm in inside diameter, 23.6mm in outside diameter, and 550 mm in length. The experiments show the uncertainty of cylinder shell resonating density meter is only 0.12%, the uncertainty of double cylinders capacitance level meter is only 0.2%, and the uncertainty of the fuel mass measurement system is 0.4%.

Application of Dynamic Vibration Absorbers to Mass Measurement

1997 ◽  
Author(s):  
Takeshi Mizuno
Keyword(s):  
Measurement System ◽  
Mass Measurement ◽  
Vibration Absorber ◽  
Rotational Axis ◽  
Automatic Frequency ◽  
Dynamic Vibration Absorber ◽  
Measuring Device ◽  
Supporting Structure ◽  
Dynamic Vibration ◽  
Auxiliary Mass

Abstract A mass measurement system which uses a dynamic vibration absorber as measuring device is developed. It can measure mass even under weightless conditions like in space stations. In this system, an object to be measured is fixed to a rotating table (rotor) at a distance from the rotational axis. Since it makes the rotor unbalanced, a centrifugal force causes the supporting structure to vibrate during rotation. A dynamic vibration absorber attached to the structure is tuned or controlled to cancel the excitation force. When the structure does not vibrate, the amplitude of motion of the auxiliary mass equals the ratio of the amount of unbalance to the auxiliary mass. Therefore, the mass of the object is determined from the motion of the auxiliary mass. According to the measurement principles, the vibration of the supporting structure must be eliminated. A servocompensator with the performance of automatic frequency tracking is applied to reduce the vibration. Experimental results demonstrate that mass can be measured accurately with the developed measurement system.

scholarly journals Mass Measurement System Using Relay Feedback with Hysteresis

2008 ◽  
Vol 2 (1) ◽  
pp. 188-196 ◽  
Author(s):  
Takeshi MIZUNO ◽  
Takahiro ADACHI ◽  
Masaya TAKASAKI ◽  
Yuji ISHINO
Keyword(s):  
Measurement System ◽  
Mass Measurement ◽  
Relay Feedback

Investigation on Measurement Method of Weight Volume Based on Acoustics

2012 ◽  
Vol 487 ◽  
pp. 816-820 ◽  
Author(s):  
Wang Jian ◽  
Chang Qing Cai ◽  
Zhang Yue ◽  
Man Hong Hu ◽  
Xiao Lei Wang ◽  
...  
Keyword(s):  
Measurement System ◽  
Measurement Method ◽  
Mass Measurement ◽  
Accurate Method ◽  
Uncertainty Of Measurement ◽  
Measuring Volume ◽  
Hydrostatic Method ◽  
Complicated Process ◽  
Class E

The measurement value of weight volume is important for correcting buoyancy influence in the mass measurement. Traditional measurement method of weight volume is hydrostatic method. It is the most accurate method currently, but it is a complicated process requiring the weight to be wetted in a reference fluid. To eliminate the influence of liquid against weight mass in the determination of weight volume of the hydrostatic method, the measurement method of weight volume based on acoustics is introduced in the paper. The results from 1 kg to 20 kg show accuracy of the measurement system is enough to measuring volume of class E weight. The relative extend uncertainty of measurement method of weight volume based on acoustics is less than 8×10-4.

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