Design of Data Acquisition System for Vehicle Based on CAN Bus     

FU Wei  QIN Shu-ren  QIU Jian-wei 《保鲜与加工》2006,(3):19-22

To the question that a meter is correspond with a set of lead and a sensor,this paper presents a design of data acquisition system for vehicle based on CAN bus.In this way,the combinatorial instrument is only connected by a bus unit.Author introduces the data acquisition structure chart and the CAN interface,analyzes the software by program flow chart,and shows it's application for vehicle virtual instrument.A method of calculating vehicle speed,engine rotate speed and the course of development mileage are also given.  相似文献   

Reference Efficiency of Planetary Gear Train     

CUI Li  QIN Da-tong  SHI Wan-kai 《保鲜与加工》2006,(3):11

Reference efficiency of a pair of gear drive without planetary motion is the base to calculate efficiency of the whole planetary gear train. The authors find reference efficiency for speed increase is higher than that of the same drive used for speed reduction. This is different from the earlier viewpoint. New equations are derived for correctly calculating the reference efficiency of spur gear and helical gear with internal conjugate and external conjugate either in the state of speed increase or speed reduction respectively. The equations are also used to calculate efficiency of 2K-H planetary gear train.  相似文献   

On the Analysis of EMCS and Its Application in the Project of Shenzhen Underground     

LI Mai  QIN Xiaoguang 《保鲜与加工》2002,(3):117-121

In this paper, the selection of type, function and technological requirements of EMCS for Shenzhen Underground has been introduced.Based on the investigation for EMCS's worldwide applications and the analysis of practice in Shenzhen Underground, the comparison and selection of PLC and DDC have been done completely.At the same time,the introduction of EMCS is organized by the center level, station level and the spot level.  相似文献   

Design of the Virtual Instrument of Frequency/Amplitude Sweep     

XIE Ting ting  TANG Bao ping  QIN Shu ren 《保鲜与加工》2002,(4):11-14

In this paper the inevitable trend of constructing open ecosystem in modern settlement environment was discussed through the history of the settlement environment and the characters of modern settlement environment.The ecological crisis,change of the modern life and the citizens' needs and the ecological system character show,that it is important for sustainable development of the settlement environment to construct open ecosystem.The construction of modern habitation and the city room embodies the concept of open ecosystem.Then,in construction and research of modern settlement,the ecological viewpoint and method should be applied.  相似文献   

Linear Disposal of Wheatstone Bridge in Strain Measurement     

WEN Cheng  QIN Shu-ren 《保鲜与加工》2004,(1):28-31

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Dynamics of Actin Polymerization     

CHENG Chao  WANG Yuan-liang  ZHANG Jun  QIN Su-Hua 《保鲜与加工》2005,(4):131-135

The process of actin polymerization and depolymerization have some relation with its function,the activation of such process is compatible to its functions. The polymerization progress is divided into four steps: The first step is the activation of the monomer actin. The nucleation of actin nucleus forms in the second step which limits the polymerization speed. The elongation of the F-actin filaments happens in the following step. In the last step, a steady-state is attained, the length of the filament does not change because the polymerizing rate in the barbed end is the same with the depolymerizing rate in the pointed end. Some factors which affect the polymerizing process, such as nucleotide, actin related proteins are discussed. The aim is to know more about how to assemble the complicated system with biomacromolecule and what to function.  相似文献   

Portable ECG Monitor Front- ended Design with C8051 F020     

DING Jian-ping  QIN Shu-ren  WAN Xiang-kui  YE Shun-liu  LIANG Xiao-rong 《保鲜与加工》2005,(5):8-11

The electrocardiogram (ECG) signal is a recording of the electrical activity on the body surface generated by the heart frequency of which is weak and low. Many researchers devote themselves to get more perfect ECG in many ways. This article introduces the characterize of an ECG signal , then discusses the requirements for the sampling circuit of an ECG. Since there are some shortcoming in common design means, the authors give an effective circuit. The system is composed of a low-cost , low-power and high-performance MCU C8051F020 , amplifier AD620 , right-leg drive circuit ,communication circuit and power management circuit. Then software design is given which is used to sampling and filtering ECG signal. Levkov filter arithmetic and smooth filter arithmetics are used in this design. In the end , the authors advance a distributing and networking ECG monitor system.  相似文献   

Frequency Refining Analysis and Its Applications in the VIs     

ZHOU Chuan-de  QIN Shu-ren  TANG Bao-ping  YIN Ai-jun 《保鲜与加工》2005,(8):1-3

Frequency refining is an important spectrum analyzing tool, and is one of the main function of signal processing and the virtual instrument. This paper introduces several typical frequency refining analysis methods including DFT and multiple modulation and so on. It also probes into their advantages and disadvantages, and proposes a new frequency refining method combining subband decomposing DFT and multiple modulation, which inherits the advantages of multiple modulation, needs not to design a specific filter, reduces the amount of calculation, and is fit for real-time refining analysis. At last, it exhibits several frequency refining algorithm and their effects with applications in virtual instruments.  相似文献   

Optimization of Worm Gearing''s Geometric Parameters Under the Condition of the Errors and the Load     

XU Wu-jiao  QIN Da-tong  SHI Wan-kai ongqing  Chin 《保鲜与加工》2004,(4):24

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Resolvent and Application of Policy Control for QoS     

HUANG Rui  LU Wei  YANG Hui  QIN Wen hao  WU Xian 《保鲜与加工》2002,(5):42-45

With the rapid increase of the Internet user and widely application of Web,the current network technology is facing great challenge. More and more multimedia operations occupy plenty of bandwidth,and result in the network congestion. Therefore,people begin to use QoS to utilize the bandwidth effectively,and ensure the transport of the emergent operation data. The paper introduces the protocols and basic components of QoS,then expatiates the conception and the basic principles of policy control QoS, moreover,emphasizes the structure model of policy control QoS and how it runs. At last,it introduces the transport process of data packets under the control of policies in a policy control QoS system,and how to make the policies in the real world.  相似文献