On the mechanical and electrical integration on the Joint Simulation System

Abstract: This paper mechatronic systems for the study, analysis of the mechanical and electrical product design and simulation of fault-tolerant error correction Technology development status, and put forward their own views.

Keywords: mechatronics simulation fault tolerant error correction

I. Introduction

Modern electronic products are moving in integrated, automated, intelligent direction, and some mechanical and electrical products less and less dependent on people, failure is impossible for people to repair, and some mechanical and electrical products form a large system, once the failure could lead to serious accidents and cause huge economic losses, such as: the United States launched the "Spirit" rover and "Opportunity" rover, fly in space for six months, once the failure by the person to diagnose and repair impossible; August 2008 a Brazilian satellite launch vehicle VLS-3 type, in an exploded when the last test, leading to the scene 21 people were killed and 20 people seriously injured.

These integrated, automated, intelligent electromechanical strong random system failure is often difficult to predict, but the Engineering practice shows that apart from a few other unexpected failure, the majority of failure is a gradual process and if early detection and timely take appropriate The measures are to prevent the machinery and electronic products design and simulation of fault-tolerant error correction and fault-tolerant Technology Research is the response to this demand.

Fault-tolerant Technology to improve the reliability of the system has opened up a new way, although it can not guarantee that the designed system is absolutely reliable in all aspects of composition, but if the introduction of the concept of fault tolerance to mechanical and electrical products, can make various factors on the performance of fault effects are significantly weakened, which means that indirectly improve the reliability of the product. Research and Application of fault-tolerant Technology, mechanical and electrical system operation for the protection of the continuity and safety, reduce accidents, improve the mechanical and electrical products of modern economic and social benefits, has very important significance.


Second, fault-tolerant hardware bionic Research

With the function of complex circuitry, more traditional hardware fault-tolerant Technology can not meet the system requirements for increasingly large circuit order to improve system reliability, it is proposed to dynamically self-fault detection, self-healing requirements, and efforts to find a new fault-tolerant design methods. Back in the late 1950s, the father of Computer von Neumann • proposed development on the self-reproduction and self-healing universal machine great idea.

Researchers have been inspired from nature, the natural computing (such as evolutionary computation, theory of the embryo, etc.) introduced into the hardware design to form biomimetic hardware (Bio-inspired Hardware, BHW). Biomimetic hardware concept was originally proposed by the Swiss Federal Institute of Technology in 1992. was proposed, although history is not long, but its development is very fast, has now become an international Research focus on the one also known as the early evolution of biomimetic hardware hardware (Evolvable Hardware, EHW). A. Thompson, who earlier made a EHW applied to fault tolerance in mind. bionic hardware is according to the external environment changes autonomously and dynamically change their structure and behavior to adapt to their living environment of the hardware circuit, it can have the same hardware as the biological adaptive, self-organizing, self-healing properties. using bionic hardware fault tolerance, redundancy does not require explicit, but to use evolution inherent fault-tolerant features, the benefits of this feature is the traditional method to achieve fault tolerance through redundant static can not be compared of.


Third, the bionic technology and new ideas fault-tolerant hardware

Hardware-based fault-tolerant bionic research on the mechanisms of biological evolution to establish reference hardware fault tolerance of new theories, new models and new methods to improve the reliability of the hardware system, of paramount importance.

(A) embryo bionic hardware fault-tolerant architecture and fault-tolerance principle
Bionic hardware can be divided into evolutionary and embryonic-type, in which embryos bionic electronic hardware systems, also known as the embryo, is an imitation of biological mechanisms to achieve fault-tolerant multi-cellular hardware.

Embryo bionic hardware fault-tolerant architecture, mainly from the embryonic cells, composed of switches and tracks array. Programmable switch matrix to connect the control signals according to completion of the switch is closed, the control line within the segment of track use of human embryonic cells, including memory, the coordinates generator, I / O for the block, functional unit, a direct connection, a programmable connection, control modules, etc. memory used to store configuration data bit string, and the state and coordinates cell generator according to the calculated results from the configuration a bit string extracted by the decoder after the embryonic cells for electronic blocks and functional units to be configured coordinates generator according to each cell recently both sides (left and bottom) coordinates of neighbor cells assigned coordinates. I / O for the block of cells between the programmable function unit connected to provide control signals to achieve a functional unit for n input Boolean functions, used to achieve the required cell function. a direct connection between the functional units responsible for communication. programmable control signal transmission control switch connected array. control module to complete the work cell state detection, fault diagnosis, control cell redundancy switching.

Links to free download http://www.hi138.com (B) embryos bionic hardware fault tolerance strategy
In order to achieve fault tolerant cells, commonly used in fault-tolerant strategies, there are two: rows (columns) and cell cancellation policy cancellation, the unit by recording the location is wrong, re-wiring, with other backup unit instead.

But for the failure to connect resources, these strategies did not give the appropriate response. Biomimetic hardware in-depth study of the embryo on the basis of fault-tolerant architecture, this paper presents a fault tolerance for a track strategy.

1 row (column) to cancel policies. Row (column) to cancel, if a cell error, then its row (column) of all cells will be canceled, and the row (column) cell function will be on it line (right column) cells replaced, that is, when a cell error, cell row (column) on the shift (right) to an alternate line (back row) instead of its current work.

(2) cell abolished strategy abolished in cells with spare cells replace the failed cells in two stages when the cells of a row over the error when the number of spare cells, the entire line is canceled, the line cells on the move, replaced with a spare line error line function.

(C) embryonic-type hardware to achieve fault-tolerant process bionic
Embryo bionic hardware fault tolerance procedures:
(1) select the device according to design requirements, to determine the hardware design;
(2) the circuit structure and related parameters such as chromosome encoded, in accordance with evolutionary algorithms evolutionary model for the evolution of the system operation;
(3) The function of the circuit generally results in line with the expected level of fitness as individuals, according to a given set of input conditions or test, the circuit model simulation based test or calculation of the group measured the fitness of each individual;
(D) embryos bionic internal hardware error detection mechanisms
Error detection is implemented in hardware fault-tolerant embryos bionic premise, this article focuses on research in error detection for cell failure mechanism.

Cell-based functional unit of the three modular redundancy and majority voting circuit is commonly used in redundant fault-tolerant hardware fault tolerance strategy.

Most of the majority voting to determine the cell module output signals, but can not determine which specific cells an error, it can not start on restart or error cells to repair the cell reconstruction. In order to detect the exact location of error cells to fix the cells, to further improve the reliability of triple modular redundancy, error detection need to design the appropriate device.


References:
[1] high-Jin Ji, equipment, principles of self-healing system failure, China Engineering Science, 2009 (5).

[2] Xin-Song Liu, Zhu Ying, fault-tolerant parallel processing system structure of Computer Applications, 2008 (1).

[3] Yao, Rui, Wang Youren, Sheng-Lin Yu, embryonic-type hardware and its key technology bionic Henan University of Technology, 2009 (3).

Links to free download http://www.hi138.com