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In this paper, we study how to use the stochastic resonance principle to detect the weak intermediate and low frequency signals under the condition of intensive noise in mechanical fault diagnosis. According to the relationship among system outputs, system parameters and input signals, we've studied the algorithm and the technology of the software self-adaptive control of the nonlinear bistable system...
This paper presents a new system architecture of the competitive robot over the Internet based on C/S, realizes a human-robots interactive game over the Internet, does some researches on its characteristics, and describes the architecture, software programming and the key technology of each parts in details. The whole system adopts the technology of Windows operation system, VC++, and Winsock network...
Embedded NC system integrates essential modules into its core by means of "acting according to actual circumstances", which can overcome the drawbacks in the system volume and power consumption of the traditional NC system based on IPC structure, cut down the costs and enhance the system's performance. The paper provides the embedded NC system with the architecture of ARM and DSP, in which...
The antibody-antigen recognition mathematics model built by Tarakanov was analyzed. In order to apply this mathematics model to faults diagnosis, the model was modified. According to the modified mathematics model, an antigen recognition mathematics model was presented. Decomposition of pattern class matrices was used to generate antigen recognition couples, then calculate the combination energy values...
When MIT Auto-ID Center developed RFID technology gets widely accepted, every product in the globe will be uniquely identified by an EPC code. In a product entire life cycle, it will travel across several organizations; all organizations apply the same product identifier, e.g., EPC, will simplify product tracking. Today's RFID application heavily concentrated in supply chain management, covers only...
In order to avoid electromagnetic disturbance, photostrictive ceramics becomes promising material to realize the optic-signal transmission and photostriction. This paper studies the dynamic characteristics of PLZT, investigates its optical bend and addresses its influence factors so as to provide the theoretical base of PLZT wafer for optical drive. Whereas the stretch of PLZT is only 1mum irradiated...
This paper introduces the design of magnetic field sensor remote nodes based on wireless sensors net, which have been used in magnetic measuring system. The node circuit consists of nRF9E5 single-chip RF transceiver and AMR sensor IC; operating frequency is 866MHz, max RF output power is +10dBm, receive sensitivity hits - 105dBm, data transmission rates up to 100kb/s
For the disadvantages of traditional signal analyzer, such as singleness of interface, poor reliability, low real-time and so on, this paper proposes a multi-DSP signal analyzer based on M-LVDS network instrument bus. This system adopts an integrated mode of multi-functional module based on standard interface, and realizes non-host parallel communication by special bus design. This system accomplishes...
The IP-based real time video surveillance system provides a way to monitor the scene on the spot at any time anywhere. An embedded system is as a sink of the system. The camera device is a front end. And the PC-based software is for the client. This weak coupling system is very flexible, efficient and low price. Using WAP technique, cell phone can be used as a client. This paper describes the system...
The piezoelectric transducer plays a key role in the ultrasonic equipment. In the assembly process of piezoelectric transducer with traditional method, the torsion and the pressure have some fluctuations, and as a result, in the process of using the piezoelectric transducer, the electric-acoustic transformation efficiency of the piezoelectric transducer gets lower, the temperature of the piezoelectric...
According to the requirements and features of the detection of dampening quantity delivered in modern printing production, a new method has been applied in this paper, which is to use optical fiber and sensor technology to realize the direct dynamic detection of the thickness of dampening film. The detection principle has been analyzed and the structural composition of the detection system has been...
In this paper, based on electromechanical coupled dynamic equations of the drive system, the natural frequencies and vibration modes of the drive system are investigated. The vibration modes of the mechanical system of the drive are classified into rotational modes, planet modes and single planet modes. The vibration modes of the electrical system are classified into synchronous mode, asymmetric out-phase...
The piezoelectric transducer plays a key role in the ultrasonic equipment. In the assembly process of piezoelectric transducer with traditional method, the torsion and the pressure have some fluctuations, and as a result, in the process of using the piezoelectric transducer, the electric-acoustic transformation efficiency of the piezoelectric transducer gets lower, the temperature of the piezoelectric...
A new 3-DOF translational parallel robot, named P-CUBE, is presented in this paper. This robot has decoupled motion in x, y and z axes, and employs only prismatic pairs. The structure and kinematics of the robot are studied, which shows there exist rotational redundant constraints to the moving platform. Some modified structures to avoid the overconstrained situation are also introduced. This machine...
Independent component analysis (ICA) is a powerful tool for redundancy reduction and nongaussian data analysis. And, artificial neural network (ANN), especially the self-organizing map (SOM) based on unsupervised learning is a kind of excellent method for pattern clustering and recognition. By combining ICA with ANN, we proposed a novel compound neural network for pattern classification. First, two...
The Scratch-Pad Memory (SPM) is the hotspot in the field of embedded system and takes great impact on the performance. This paper proposes a method to well utilize the SPM taking the influence of the whole embedded system into account. Results show that our benchmarks average a 26.2% speedup and will gain better performance with larger SPM
Dynamic power management (DPM) is a design methodology for dynamically reconfiguring systems to provide the requested services and performance levels with a minimum number of active components or a minimum load on such components. The principle of DPM selectively shuts down or depresses performance of some components that are idle. Many approaches have been exploited for DPM, different approach leads...
In this paper, the velocity and inertial force 3-RlowbarRlowbar(lowbarRlowbarRmacr)macrRmacr performance of a new parallel mechanism are analyzed by global conditioning index which includes Jacobian matrix and Hessian matrix, and this index is different from the old one which only includes Jacobian matrix. The performance atlas are given, and the mechanism's parameters can be easily selected which...
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