Applied Mechanics and Materials Vols. 602-605

Abstract: A information-detecting recorder is designed, which can detect the swimmer’s pulse signal through a sensor module wrapped on their wrist, then send the alarming signal to the monitoring center by the wireless way. This system makes the saver find the drowned man at the first time and help them, that not only realizes the intelligence of monitoring system but also guarantee the human’s safety.

Abstract: This paper introduces the working principle, hardware and software designs of ultrasonic distance measurement based on STC89C52RD MCU. The hardware mainly consists of ultrasonic module, liquid crystal display module, alarm module and function key circuit. The system can clearly display the measurement results with high accuracy and can be applied to auto reverse anti-collision alarm system.

Abstract: ECG signal contains a large number of health information of human body, the accurate measurement of ECG signal have important significance on the prevention and treatment of cardiovascular disease (CVD). The existing pulse detection instruments cannot meet the needs of today's society in terms of portability and real-time, especially for the elderly with CVD, it almost has nothing effect on real-time monitoring. Therefore, a wrist pulse real-time monitoring system is designed in this dissertation, which can make real-time detection and record the pulse information, and do short-term heart rate variability (HRV) analysis to the pulse information gained, to react and sent a distress signal with multilevel alarm mechanism quickly when the patient is sick, trying the best to ensure the safety of patients' life. Experimental results show that the hardware circuit of this system is stable and reliable, and pulse analysis algorithm has a good consistency with a small amount of data, this system can be applied to CVD monitoring in modern family.

Abstract: This paper proposed a set of measurement system based on the method of stick vibration mode and LabVIEW virtual instrument technology, which is used for measuring the young's modulus of loudspeaker spider. The inherent frequency and young's modulus of a cotton spider are measured by this system. After the young’s modulus is obtained, modal analysis is conducted on the sample by using finite element simulation method. The measured results and the simulation results are compared. The difference between two results is 0.4% which verify the correctness of the system.

Abstract: Aiming at the theory of infrared image quality evaluation, current image metrics are concluded and summarized in this paper. Meanwhile, 2 groups of contrast experiments are designed to get the values of 3 kinds of typical metrics (SV, TSSIM and TTSIM). Furthermore, the deficiencies of the current typical image metrics are analyzed in the light of the experimental results. What's more, the bottleneck and challenge of the infrared image quality evaluation are foreseen and the probable solutions are briefly discussed based on the results.

Abstract: On the basis of the demand hierarchy theory and through the questionnaire survey, the rational consumption demand characteristics of automobile customers were obtained in the paper. According to the research objectives, and taking Huai’an automobile consumption market for example, the results of statistical analysis with the investigation content of age, income and career were given out. After establishing the value statistics model based on customer demand, and taking automobile insurance for instance, using the multivariate linear regression method and going through F checkout, the linear quantitative relationship between automobile insurance and automobile age, family income, the cost of buying an automobile was obtained, and the results were analyzed. A large number of sample statistics indicated that the service value link mainly was the link of automobile insurance, beauty decoration and maintenance.

Abstract: The precision of vehicle speedometer directly influenced traffic safety, in order to ensure its reliable work, the speedometer precision must be tested regularly. During the current vehicle speed detection practice, the tested vehicle wheel was driven by the roller and the slippage between the roller and vehicle wheel was not calculated, therefore a great error came into being in the detection result for the vehicle with rear-place, rear-drive and the speed signal getting from the front wheel, aimed at this circumstance and based on analyzing vehicle speed test principle, the speed sensor and data acquisition card were chosen, and a vehicle speed detection system was improved by appling NI LabVIEW software in the paper, which had overcome the shortage of the traditional vehicle speed test principle, When being applied in detection practice, it could improve the accuracy and pass-rate of vehicle speed detection.

Abstract: The research of robust tracking GNSS signal has been focused on increasingly in hash environment. In order to tracking weak GNSS signal, what an efficient approach is increasing coherent time. However, increasing coherent time brings several problems. It causes coherent loss and loop stability issues. This paper proposed an improved tracking architecture based on moving average method, a complex loop filter for the architecture is not considered, but the moving average method before frequency discriminator for a frequency lock loop is introduced. Compared with typical tracking loop, the coherent time is different from loop update interval in the method. Increasing the coherent time reduces the output error of frequency discriminator, and the loop noise bandwidth is increased in shorter loop update interval. Hence, use of such type of scheme provides higher dynamics for weak signal tracking. The simulation results are shown to verify the performance of the methods.

Abstract: The requirement of reliability for the embedded software is increasing. In practice, it is significant to evaluate the operational cycle and to predict the lifetime of embedded software, and it also can supply a support for quality product assessment and decision-making system. The smart meter is a typical representative of embedded software. The results of reliability assessment can guide the development and design direction of the smart meter. The proposed assessment technique is very significant to improve the product quality.

Abstract: It has a far-reaching significance of developing and utilizing the marine resources to improve the human environment and alleviate the shortage of resources for the rich mineral, biological, oil and gas resources provided by the ocean. Undersea observation techniques, as an vital path to understand the ocean and exploit the ocean resource, play a more and more extensive influence in and around the world via its real-time, in-situ and 3-dimentional observing features. As an important part of the seafloor observation systems, SIIM serves as a bridge to connect the instruments and junction box. It requires that SIIM must have the ability to endure the high pressure, corrosion and organism attachment, and to ensure its modules work well. This paper aims to introduce a method of designing mechanical structure of SIIM. Finally, the reliability of the design is verified by means of the finite element analysis.