Papers by Keyword: Angle

Abstract: This experimental research proposes a contactless silicon-based two-dimensional (2D) Hall sensor capable of simultaneous parallel-and perpendicular-directional magnetic sensing, with a 360° angle measurement. The Hall sensor was of non-symmetrical five-ohmic contact configuration (C1 – C5). In the study, experiments were carried out in three stages. In the first-stage experiment, the current (I) and voltage (V) of the 2D Hall sensor were determined under three schemes: schemes A (C1&C2), B (C2&C5), and C (C3&C4). In the second-stage experiment, the parallel and perpendicular absolute sensitivities of the 2D sensor were examined. Considering the discrepancy between the parallel and perpendicular absolute sensitivities, signal conditioning circuitry was incorporated into the sensor system to compensate, and the rotational angles measured in the final-stage experiment. The results revealed that the I-V curves were dominantly linear, corresponding to Ohm’s law. However, the parallel and perpendicular absolute sensitivities were low and unequal. Thus, signal conditioning circuitry was incorporated into the system to address the discrepancy and improve the performance. Importantly, the 2D Hall sensor exhibited a mere ±3^o discrepancy between the measured and reference rotational angles, given the magnetic flux density of 1000 G, with the hysteresis error of 2.8%. In essence, the proposed contactless silicon-based 2D Hall sensor possesses high potential for high-precision industrial applications.

Abstract: The current paper presents yttrium oxide wetting angle examination. The test was performed in accordance with two different methods: contact and noncontact heating. Upon completion of the test, microstructural and spectral analysis of substrate/metal contact areas was conducted. Test findings are listed in the Conclusions.

Abstract: Self-A (Self-calibratable Angle device) rotary encoder can detect some kinds of angle error, not only its encoder scale error, but also the encoder attachment error (e.g. eccentricity error). When rotary table with built-in Self-A encoder rotates only one revolution, inner Self-A rotary encoder can calibrate the own angle error with a high accuracy. However, in the case of the Self-A using the encoder of 36,000 graduation scales, since the angular interval of the calibrated main scales corresponds to 36", it is insufficient for high resolution angular indexing control with high accuracy. Generally, the angle error of electric interpolation signal is estimated to be 1 % of main scale resolution that corresponds to about 0.36" for 36,000 scales encoder. Accordingly, even if Self-A had the ability which can calibrate in the accuracy 0.1", when it was controlling the rotary table using an electric interpolation signal, its total accuracy worsened to about 0.36". For improvement in precise angular-position control, we developed Self-A rotary table which can calibrate the angle signal at high resolution including electric interpolation signals. In this paper, we introduce the performance of the new high resolution Self-A encoder table. It keeps high accuracy and good repeatability in the 360° whole range as well as in the short range of ±1,000".

Abstract: In this paper we talk about the influence factors to the NH3 spray of Solid Selective Catalytic Reduction (SSCR) system by using AVL FIRE 3D commercial simulation software when NH3 and exhaust gas mix in exhaust passage,the influence factors include: engine condition, NH3 temperature ,nozzle installation angle and nozzle position. The conclusions are as follows:engine condition has much Influence for NH3 and automobile exhaust mixing,the mixing is better,the exhaust flow is larger, the exhaust temperature is high;NH3 initial temperature for the gas mixing has little influence;nozzle angle increases is good for the axial distribution of gas and the gas mixing characteristics; For the SSCR system direct injecting NH3 can optimize the nozzle position, and reduce the exhaust system volume.

Abstract: In the actual production process in plane grinder, they often encounter processing with angle plane, and so with angle plane in the grinding before we must locate the workpiece, but in reality the plane grinding machine in the production process is the lack of it can accurately locate the workpiece tool, Therefore, in view of the above in the processing of the existence of the problem, research and design a new type of movable angle cursor positioning ruler, the following discusses the structure design.

Abstract: The aim of this paper is to analyze limitations of the sight conditions from the vehicle, which is caused by construction parameters of the vehicle. It deals with front pillars, its influence on sight conditions and evaluation of sight width according to the active car safety. The first part deals with passive and active safety of vehicles. Next part is the choice of the most common vehicle in The Czech Republic and defining its parameters. Using a mathematical derivation were detected angular values of the sight. The resulting values were then evaluated and analyzed.

Abstract: The purpose of this research is to study the accuracy of RP FDM Process. This research involves varying two parameters in building up the prototype which is the buildup angle and the sparse for each layer (volume of parts). The varying parameters were used in the FDM process for three types of specimen (profiles) which is the Cube, Cylinder and Pyramid. The varying parameters are the build up angle of 30⁰, 65⁰ and 90⁰ and for the types of sparse, there are three types of sparse used which is Low Density (LD), High Density (HD) and Solid Type. The results of the dimensional accuracy are analyzed by calculating the percentage of difference of the dimensional measurement for the specimen and the actual dimension of it. The lesser difference, the better the dimensional accuracy. The conclusion of this study is the less complicated specimen shape for the FDM process, the more accurate of the dimensional accuracy with the optimum build up angle of 30⁰ or less and the optimum type of sparse of Low Density Type (LD).

Abstract: In track and field, triple jump is an influential and with complex technical difficulty among these track and field events. With the gradually improvement of scientific research and practice training in track and field events, their sports level also gradually improved. This paper describes the technique development and principle analysis of triple jump, emphasize the overall importance of movement rhythm and balance control in triple jump, further analyse balance control process of mechanical movement in triple jump, thus scientifically analyse both in the upper extremity balance control and timing function, which has important implications for the analysis and diagnosis of triple jump technology.

Abstract: Along with the continuous improvement of China's science and technology, pattern recognition calculation methods have attained a rapid development, among which the new algorithms have been popularized and applied in pattern recognition. The angle of pattern refers to the intersection angle between two adjacent vectors, and owns the geometrical characteristics such as stretching, displacement, and rotation invariance, which are better unification for pattern characteristics. In this paper, the angle-based pattern recognition algorithm is mainly analyzed.

Abstract: One design method of small digital angle sensor based on microelectronic mechanical system (MEMS) is introduced. The angle sensor is build with the embedded microprocessor STM32F103 as the core. The acceleration value of MEMS accelerometer in X, Y, and Z-axis directions was used to calculate the angle of measured target on the horizontal direction and vertical direction, and the digital and miniaturization of digital angle sensor are realized.