Applied Mechanics and Materials Vols. 490-491

Abstract: The main objective of the presented study and simulations conducted was to investigate the prospect of using B-spline curves for the automatic parking, i.e. self-driving, or intelligent vehicles. We consider the problem of parallel parking for a non-holonomic vehicle with a known maximum path curvature. The relationship between the properties of the path and the geometry of corresponding parking spot is revealed. The unique properties of B-splines are exploited to synthesize a path that is smooth and of continuous curvature. The contributions of this project are in the generations of better, smooth continuous paths. This improves passenger comfort during the parallel parking maneuver and allow vehicles to park in tighter spots by increasing the feasible range of the parking manoeuver.

Abstract: To solve the vehicle longitudinal dynamics problems of driving control, this paper takes the electric off-road vehicle with separated driven axles as the research object. An 8-DOF system dynamics model of vehicle with independently driven front and rear wheels was built by using the MATLAB/Simulink software. The recognition algorithm of the separated road surface was proposed and corresponding driving control strategy was researched. The simulation results show that the proposed drive control strategy can adapt to separated road surface, and ensure vehicle driving safely in accordance with the driver's intention.

Abstract: Recently, the tufted carpet pattern are getting more and more complex. However jacquard machine equipment is relatively backward and it has low degree of automation, which has caused a lot of labor and low efficiency. To solve these problems, the pattern forming principle of the tufting jacquard machine was studied and the design of automatic control system was put forward. So an embedded electronic jacquard machine controller based on ARM7 was developed.

Abstract: A solid propellant microthruster array consists of three parts (five layers) was designed to form propulsion system of nanosatellite. The layers of the array were fabricated by different MEMS technique respectively. Then the array was assembled by adhesive bonding (H70E thermal epoxy). An initial test was operated with the ignition test stand composed of high speed video system, electronic power source, and oscilloscope. A constant voltage was applied to the igniters through two probes contact with the pad of ignition circuitry. The test indicates that the microthruster array can be ignited under 15V.

Abstract: With the development of computer and network technology, the pace of peoples life is more and more fast. At the same time, the need in the entertainment is also growing. The game based on handheld is becoming more and more popular. It has been booming along with the development of its educational, fun, casual, easy to carry, easy to operate, highly interactive and many other features to meet the people's entertainment needs.This paper introduces the embedded systems based on general-purpose software development model and development process, including the design of hardware platform and software. The design of the hardware platform is the QuartusII10.1, the software platform is Nios II EDS 10.1 and the programming language is C and VHDL. Based on the SPOC Builder tool, we designed the reconfigurable IP cores of the VGA display, LTM touch screen. With Galaxian game as an example, we design a embedded game based on GUI. The results show that the game system is friendly human-computer interaction and quick response and action. This configurable IP core is highly flexibility, variability, plasticity and it can achieve more functional expansion and development in the same resource.

Abstract: Common R or R-L load do not need special inverter circuits, however piezoelectric load can be considered as R-C load and its voltage does not become 0 even though the applied voltage is 0. Therefore it needs some special inverter with circuit that can discharge the capacitive energy. Especially for unidirectional square-wave voltage driving, it becomes more serious problem. In this paper, an energy recovery circuit for unidirectional square-wave voltage driving for piezoelectric load is proposed. With the circuit, the peak load current and the power supply capacity can be reduced because the energy in the load capacitor is saved to a capacitor for energy recovery and recharged from the capacitor. The appropriateness is proved from the simulation of the proposed circuit.

Abstract: In this paper a new technique is designed to build a model concerning cylinder pressure in diesel engine. The concept is to build a working cycle model utilizing artificial intelligent system. Artificial Immunity System (AIS) and Artificial Neural Network (ANN) are proposed as a new approach that can be used to simulate cylinder pressure for different crankshaft speed and loads. Experimental test results of diesel engine model (AD3.152 UR) are used to train AIS system and ANN. The proposed model succeeded to provide reliable result and prove to be useful in evaluating the quality of working cycle in diesel engine.

Abstract: Most of modern tall buildings using lighter construction materials are more flexible so could be excessive wind-induced vibrations resulting in occupant discomfort and structural unsafety. The optimal control technique for reducing along-wind vibration of a tall building based on the linear quadratic regulator (LQR) is presented in this work. Actively controlled reduced along-wind vibration response is obtained from the tall building installed in an active mass damper (AMD) with a LQR controller. Fluctuating along-wind load is generated using numerical simulation method, which can formulate a stationary Gaussian white noise process. Simulating wind load in the time domain using known spectra data of fluctuating along-wind load is particularly useful for estimation of windinduced vibration which is more or less narrow banded process such as a along-wind response of a tall building. In this work, fluctuating along-wind load acting on a tall building treated as a stationary Gaussian white noise process is simulated numerically using the along-wind load spectra proposed by G. Solari in1992. And using this simulated along-wind load estimated the reduced along-wind vibration response of a tall building installed in an AMD with a LQR controller.

Abstract: It has difficulty in nonlinear modeling of performance characteristic of ultrasonic motor for its complex micro-structure. Through matching three sets of V_pp-I_m data measured near the resonance frequencies of five ultrasonic motors, we run PSIM 6.0 to extract a new model in which nonlinear resistance and micro capacitance are tuned till touching the minimum relative errors between model V_pp (mean)-I1 data and measured V_pp-I_m data. The experimental results show that five key parameters of this model match for actual driving data of ultrasonic motors with diameter of 45mm and their waveforms show well too. This work will provide both compact ideas for future nonlinear modeling and applied simulation basis for its ASIC design.

Abstract: The main purpose of this study was to investigate and understand how to reduce negative effects of car blind area and find a method to ensure the safety of vehicle. We designed a system to implement these functions. The system is based on AT89S52 MCU, and it uses the infrared sensors, ultrasonic sensors, buzzer, and LED lamp to implement the detection of object and pedestrian in the driver's blind area in time, and dispose the detected information by AT89S52 MCU. The ultrasonic sensor can detect objects and people at a certain range, and the infrared sensors can detect people or other animals under the car or behind the car. When danger may happens, the buzzer alarms and LED lights to remind the driver to take relevant measures. Experiments showed that the system can perform well to show whether there is people or objects in blind areas. It improves the safety of driving and ensures the safety of drivers and pedestrians. The system belongs to the technology of active safety and it provides many advantages, including flexibility, extensibility, implementation simplicity, and cost savings.