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This paper presents an objects-based topological mapping algorithm on different floors with various objects using a wheeled mobile robot. The extended Kalman filter (EKF) with adaptive measurement noise according to the terrain type is proposed to estimate the position of the robot. If an infrared distance sensor detects an object, the robot moves around the object to obtain the shape information...
Humans infer rich knowledge of objects from both auditory and visual cues. Building a machine of such competency, however, is very challenging, due to the great difficulty in capturing large-scale, clean data of objects with both their appearance and the sound they make. In this paper, we present a novel, open-source pipeline that generates audiovisual data, purely from 3D object shapes and their...
The brake drum is inevitably accompanied with vibration during its operation process, so it is particularly important to study its dynamic characteristics. In this paper, the modal analysis of the brake drum was carried out, and the first 12th natural frequencies and associated shapes of vibration were computed. In addition, the probable resonance risk and design hidden troubles were pointed out,...
In this paper the possibility to extract information about drops vibration and deformation using the polarization characteristics of electromagnetic wave and receiving antennas are considered. The mathematical expression that demonstrates the impact of drop shape deformation and vibration onto the field reflected from liquid hydrometeor assemble and received by the antenna with arbitrary polarization...
Although acoustical features can be extracted directly from time series, more relevant and more precise features can be collected from a higher processing level, namely, the frequency domain. Physicians prefer thin peaks in the frequency space, which can be usually achieved by windowing and wavelet analysis. In a bio-inspirited way, the human brain can determine an object from the area of the region...
Media arts created utilizing sound vibration have a big visual impact to audiences. One of the well-known artworks created by one of the authors, Naoko Tosa, is "Sound of Ikebana," which combined physical phenomenon, sound shape computing, and traditional Japanese flower arrangement culture. The method she used to create the artwork is Sound Vibration Form (SVF), which uses sound vibration...
Silicone gels have been used as an encapsulation for power electronics modules. We investigated electric treeing in silicone gel under AC voltage. The trees in silicone gels consist of two parts: bubble and straight part. This type of tree is called pearl-chain type tree. The tree vibrates under AC voltage and its frequency of vibration was twice of the applied voltage. The diameter of bubble or the...
The modal analysis plays an important role in analyzing the vibration and noise of the motors. The models of the stator which are based on the interior permanent magnet synchronous motors (IPMSM) by the 3D finite element software are analyzed. Firstly, it is significant to simplify the stator rind by considering the different components. Then the relationships of the different parameters of the stator...
This research analyzes two stator design features as structural solutions to reduce noise and vibration in permanent magnet synchronous machines (PMSM). The study was focused on a surface mounted PMSM with 12-stator slots and 10-rotor poles where vibration is a well-known issue. The structural-harmonic analysis was used to quantify the vibration by analyzing the radial deformation and acceleration...
The amorphous alloy transformer has less no-load current and loss, but the structure characteristics of the runway shape winding make it show greater vibration intensity and noise at the load condition. Based on the structure characteristics of the amorphous alloy transformer with runway shape winding, a leakage-stress-acoustic coupled calculation model is proposed to calculate the electromagnetic...
In this paper, the natural vibration mode shapes and frequencies of the stator of large electric machine are computed by finite element method (FEM). In FEM model, several boundary treatments are especially considered, including welded connection between boards of stator, bolt connecting structure between end housing and frame board, shrink fitting between rotor axis and bearing. The influence of...
The mobile C-arm can be used for 2D and 3D X-ray imaging. The motion of 3D X-ray scanning may result in vibration of the C-arm, which will probably affect the image quality. It is very necessary to study the relationship between the vibration characteristics of the C-arm and scanning motion. In the paper, we made modal analysis of the mobile C-arm based on Solidworks, and obtain the initial 6 order...
In this study, we present a position estimation of ball impact in baseball batting using PVDF films. A vibration sensor consisted of two PVDF films in a cross shape was developed. The outputs from the PVDF films were normalized and filtered. We calculated the largest peak of the normalized and filtered outputs to eliminate the effect of intensity of the impact and extract a primary vibration mode,...
The multimodal control of a 2D controlled-Friction Device is presented. We use the Vector control method because the phase and amplitude of two vibration modes at a same frequency can be precisely set. The closed loop response time of 10 ms is achieved. The device is then associated with a finger position sensor. The algorithm of the multimodal approach is then tested. In spite of the inevitable limitations...
The resonance frequencies and mode shapes of aPCB are highly depended on form factor and stack-up. Moreover, the interaction with components mounted to the PCB cannot a priori be neglected. In the search for key parameters that might impact the outcome of a board level vibration test, it is important to asses the impact of these factors on the principal PCB vibrational characteristics. The resonance...
Tool-held hitting tasks, like hammering a nail or striking a ball with a bat, require humans, and robots, to purposely collide and transfer momentum from their limbs to the environment. Due to the vibrational dynamics, every tool has a location where a hit is most efficient results in minimal tool vibrations, and consequently maximum energy transfer to the environment. In sports, this location is...
Wearable haptic feedback devices for virtual reality, human-robot interaction, and motion guidance require lightweight actuators that display clearly discernible cues to the user. These goals motivate the design of WRAP, a wearable, pneumatically actuated haptic feedback device. WRAP displays a variety of tactile sensations to the user by inflating a thermoplastic pneumatic actuator in direct contact...
Taking a multi-joint robotic arm for example, the flexibility of links and joints are considered. The dynamic characteristics of the flexible robotic arm are studied based on finite element method and experimental modal analysis. The analysis results are compared. First, pre-stressed modal analysis of the flexcible robotic arm are carried out applying software ANSYS Workbench. The natural frequencies...
The amplification of video allows sub-pixel movement to be revealed. This has been applied to measure structural vibration using high speed video. A perspective correction has been defined to allow 2D modal analysis to be conducted on a flat plate showing that accurate displacement measurements across the surface can be made. Furthermore, the effect of using various excitation signals including white...
Analyzing vibration characteristics of micro-cantilever beams under different loading conditions including moving loads is required in various MEMS applications such as wind speed sensors, bio-sensors and chemical sensor arrays. This paper, therefore presents a mathematical model to evaluate the vibratory response of rectangular cross-section micro-cantilever beams in time domain for any time and...
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