Research on Sound Velocity Measurement Method by Three Microphones Based on LABVIEW

2014 ◽  
Vol 511-512 ◽  
pp. 307-310
Author(s):  
Ran Li ◽  
Tao Feng ◽  
Fu Yao Zang ◽  
Jun Jie Hu ◽  
Li Zhang ◽  
...  
Keyword(s):  
Theoretical Calculation ◽  
Sound Velocity ◽  
Measurement System ◽  
Velocity Measurement ◽  
Measurement Method ◽  
Sound Pressure ◽  
Experimental Results ◽  
New Method ◽  
Labview Software

This paper proposes a new method of getting sound velocity by measuring the sound pressure at three positions in a tube. By using LabVIEW software as a platform and building the measurement system, sound velocity at different frequencies in current media is measured. Compared the experimental results with theoretical calculation ones, the correctness of the method discussed in this paper and the reliability of the system are validated.

Research of the High-Precision Dual-Channel Sound Velocity of Seawater Measurement System

2014 ◽  
Vol 668-669 ◽  
pp. 940-943
Author(s):  
Bao Feng Zhang ◽  
Zi Ming Xie ◽  
Zhi Wei Li ◽  
Jun Chao Zhu
Keyword(s):  
Sound Velocity ◽  
High Precision ◽  
Measurement System ◽  
Velocity Measurement ◽  
Time Interval ◽  
Interval Measurement ◽  
Dual Channel ◽  
Precision Time ◽  
Time Interval Measurement ◽  
Time Of Flight Method

For single channel sound velocity measurement system accuracy was generally not high,a high-precision dual-channel sound velocity of seawater measurement system was designed.Based on ultrasonic speed of sound measurement in seawater with time-of-flight method,the system used ARM microcontroller to combine with high-precision time interval measurement chip,and the sound velocity measurement was translated into distance and time measurement. Then the influence of the time delay of the system was eliminated by method of difference.The paper introduced the modules of the system,and the high-precision time interval measurement method as the key technology of time-of-flight method for the velocity measurement system was expounded.It wasproved by experiment that the measurement accuracy of the system on the velocity reached 0.019m/s.

A Velocity Measurement Method Based on Scaling Parameter Estimation of a Chaotic System

2011 ◽  
Vol 18 (2) ◽  
pp. 275-282
Author(s):  
Lidong Liu ◽  
Jifeng Hu ◽  
Zishu He ◽  
Chunlin Han ◽  
Huiyong Li ◽  
...  
Keyword(s):  
Parameter Estimation ◽  
Numerical Simulations ◽  
Chaotic System ◽  
Velocity Measurement ◽  
Measurement Method ◽  
Chaotic Synchronization ◽  
New Method ◽  
Target Velocity ◽  
Scaling Parameter ◽  
Generating System

A Velocity Measurement Method Based on Scaling Parameter Estimation of a Chaotic SystemIn this paper, we propose a new method of measuring the target velocity by estimating the scaling parameter of a chaos-generating system. First, we derive the relation between the target velocity and the scaling parameter of the chaos-generating system. Then a new method for scaling parameter estimation of the chaotic system is proposed by exploiting the chaotic synchronization property. Finally, numerical simulations show the effectiveness of the proposed method in target velocity measurement.

Device and Method for Large Size Aspheric Measurement

2010 ◽  
Vol 97-101 ◽  
pp. 4324-4327
Author(s):  
Yong Lu Zhu ◽  
Yin Biao Guo ◽  
Xiao Long Ke ◽  
Lu Shuang Chen
Keyword(s):  
Control System ◽  
Measurement System ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Detection System ◽  
Experimental Results ◽  
Aspheric Surface ◽  
Large Size ◽  
And Control

In this paper, the necessary instrument and control system called the “Large Size Four-axis Measurement System” which used for measuring large size aspheric surface have been designed and established. Then the development of semi-meridian measurement method on basis of large size four-axis detection system has been reported. The measurement paths were planed and the measurement program was performed on the IPC. The method can significantly reduced the align error caused by the aspheric center which is not coincidence with the rotation platform center. With the measurement system, an aspheric surface was successfully measured; whose radius of semi-meridian was 55 mm. The experimental results show that the developed methods are simple and rapid. The measurement accuracy can satisfy requirement of aspheric surface.

scholarly journals A Sound Velocity Measurement System for Thin Steel Sheet Based on Ultrasonic Interferometry

1997 ◽  
Vol 83 (4) ◽  
pp. 245-250
Author(s):  
Fumihiko ICHIKAWA ◽  
Hajime TAKADA ◽  
Kazuya ASANO ◽  
Kenichi SADAHIRO
Keyword(s):  
Sound Velocity ◽  
Measurement System ◽  
Velocity Measurement ◽  
Steel Sheet ◽  
Thin Steel Sheet ◽  
Thin Steel ◽  
Ultrasonic Interferometry

Using Ceramic Balls to Reduce Noise in a Linear Guideway Type Recirculating Linear Ball Bearing

2003 ◽  
Vol 125 (3) ◽  
pp. 480-486 ◽  
Author(s):  
Hiroyuki Ohta ◽  
Takumi Nakagawa
Keyword(s):  
Sound Pressure Level ◽  
Sound Pressure ◽  
Ball Bearing ◽  
Pressure Level ◽  
Linear Velocity ◽  
Sound Frequency ◽  
Experimental Results ◽  
New Method ◽  
Sound Pressure Levels ◽  
Steel Balls

A new method of reducing the noise of the linear guideway type recirculating linear ball bearing (linear bearing) was studied. In the experiments, the overall sound pressure levels of linear bearings with steel balls or ceramic Si3N4 balls were measured, and sound frequency analyses were carried out. Moreover, based on the assumption that the main cause of the noise may be the collision between the ball and the carriage, the overall sound pressure levels of the linear bearings were analyzed combining the Hertzian theory and the results of previous studies on collision sound. From the results of experiments and analyses, the conclusions were obtained as follows: (1) The overall sound pressure level of the linear bearing with steel balls can be reduced by about 4.5 dB by using Si3N4 balls having the same diameter; (2) The overall sound pressure levels of linear bearings with steel balls or ceramic Si3N4 balls were both increased by about 9.8 dB as the linear velocity increased an octave; and (3) The analytical results, based on the assumption that the main cause of the noise emitted from the linear bearings is the collision between the ball and the carriage, match the experimental results well.

A Multi-Path Tolerant Displacement Measurement System Using Radio Wave Phase Differences

2004 ◽  
Author(s):  
Nobuhiro Suzuki ◽  
Tadashi Mikoshiba ◽  
Atsushi Mogi
Keyword(s):  
Radio Wave ◽  
Measurement System ◽  
Measurement Method ◽  
Measurement Precision ◽  
Displacement Measurement ◽  
Experimental Results ◽  
Radio Waves ◽  
Measurement Systems ◽  
Wave Phase ◽  
Phase Differences

In quake-proof test facilities, multipoint displacement measurement systems are demanded to analyze quake-destroy mechanisms of structures. As a one of those systems, we have proposed a measurement method using radio wave phase differences. Observing carrier phases of radio waves from transmitters attached on measurement points, the displacement of measurement points can be measured. In this report, we propose an improved measurement method that uses redundant number of sensors to obtain multi-path tolerant capability. We will also report some new experimental results which show the proposed method has sub-centimeter measurement precision.

Research of the Technology Based on Fiber Bragg Grating for Measurement of Temperature Rise of Electrical Appliances

2012 ◽  
Vol 571 ◽  
pp. 200-204
Author(s):  
Zhao Xi Wu ◽  
Yu Zhan Wei ◽  
Jian Cui ◽  
Shui Sheng Wang ◽  
Xiao Peng Dong
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Temperature Rise ◽  
Electromagnetic Interference ◽  
Measurement Method ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Experimental Results ◽  
New Method ◽  
Measuring System

A new method of using fiber Bragg gratings as the sensing elements in the measurement of temperature rises of electrical appliances is proposed in this paper. Comparing with the conventional measurement method with thermocouples, the new method can overcome problems such as electromagnetic interference, hazard of electrical leakage, etc. The characteristics and key components employed in the measuring system are analyzed and discussed. The experimental results show that the temperature rises of electrical appliances under test can be obtained quickly and accurately with the specifically designed sensors made by optical fiber Bragg gratings.

A Target Indirect Thrust Measurement Method of Pulse Detonation Engine

2015 ◽  
Vol 32 (2) ◽  
Author(s):  
Xiqiao Huang ◽  
Yuefei Xiong ◽  
Chao Li ◽  
Longxi Zheng ◽  
Qing Li
Keyword(s):  
Measurement System ◽  
Measurement Method ◽  
Experimental Results ◽  
Axial Position ◽  
Pulse Detonation Engine ◽  
Target Plate ◽  
Pulse Detonation ◽  
Thrust Measurement ◽  
Detonation Engine ◽  
Optimum Measurement

AbstractAn indirect thrust measurement method based on impulse of a target plate was developed, and a new thrust measurement system (TMS) was successfully designed and constructed. A series of multi-cycle experiments on thrust measurement were conducted to investigate the feasibility of this method with the newly-built indirect TMS. The thrust measurement of PDE was made at different plate target axial positions and operating frequencies. All the experiments were conducted using gasoline as fuel and air as oxidant. The experimental results implied that the thrust of PDE by using the indirect impulse method was a function of the target plate axial position, and there existed an optimum measurement position for PDE with a diameter of 60 mm. The optimum target plate position located at 3.33. According to the experimental results, the thrusts obtained by using indirect TMS were less than the actual values, and so the observed value of thrust was modified in order to make the thrust more reliable. A relative accurate calibration formula depending on the operating frequency was found.

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