The Software And Hardware Design And Realization Of A New Type Trosional Braid Analyser

Torsional Braid Analyser(TBA) is an important analyser for testing molecular motion , many change , solidification and aging process of the high polymer materials. The analyser twists the braid on which is the high polymer materials to measure dynamic modulus and mechanical losing of free decaying vibration relations with temperature, reflect the viscidity and spring of the materials (glass transformation, secondary change, crystallization, melting, brilliant type change, etc) under different temperature. It is one of the most sensitive methods of studying the compatibility of component parts of mixture. Professor J.Gillham put forward the basic principle of TBA in the 1960s. The college of computer science and technology of Jilin University have already worked out several generations of TBA in succession. The new type TBA called GDP Four is the latest generation of TBA based on the previous generations which adopts new system architecture and merges many advanced computer technologies such as USB communication, fuzzy control, etc. There are obvious improvement and upgrading in many aspects of new one comparing with the previous.The new type TBA is made up of four parts: PC, controller, sample stove and printer. The controlling software in the PC called GDP Experimental System(GDPES) can control the controller, get the datum from the controller to proceed and save the datum. The data processing software in the PC called GDP Datum Manager System(GDPDMS)can proceed the datum gotten from the controller and output the results with many forms (display, print and save the text and graph files). Controller can receive the parameters and other control commands from PC through USB interface and control sample stove to carry on experiment and test automatically, then it can receive experimental datum and results from sample stove and assign the PC to analyze and proceed it. The sample stove can offer the experimental environment for test specimen, control the experimental procedure through the control device, and receive experimental data and result through the sensing device. Printer can output the experimental data and result. The data processing software of PC can export the result (data or graph) through printer. The new type of TBA comes down to two pivotal technologies: USB(Universal Serial Bus)communication and fuzzy control. The USB communication technology is used in communication between the GDPES and Controller. As a new standard of interface, USB interface has a lot of benefits compared with previous generations such as low cost, high reliability, uniform interface, hot plug, agile usage and extensive supply for operate system and device vender and so on. USB 1.1 specification is the general standard on the computer and peripheral that support USB at present. USB2.0 specification is the latest standard of the Universal Serial Bus. As a USB device, the controller adopts USB 1.1 specification to complete the data transmission and command transmission with PC by a default control pipe, an input pipe and an output pipe. The fuzzy control technology is used in temperature control system. The TBA system has a closed fuzzy control system that composes of the fuzzy controller realized by software, a temperature measure system and a resistor in the stove. The fuzzy controller gets the current temperature from the temperature measure system and then gives the heat to the resistor with the temperature. We use a method that can create control table of fuzzy controller fast for the stove having lag. A control table applicable to this system can be achieved, which can control the temperature of the sample stove preferably and obtain a better time-temperature curve. The design and realization of the new type TBA hardware system focuses mostly on the controller. The controller is made up with two MCU. The master MCU can harmonize the act of the whole controller, communicate with PC, do experiment and process the datum and so on. The periphery circuit is made up with USB communication circuit, collecting...