نتایج جستجو برای: 2d accelerometer

تعداد نتایج: 90332  

2005
Xiaojing Li Chris Rizos Linlin Ge Eliathamby Ambikairajah

Structural responses to severe loads such as due to typhoons and earthquakes are very complicated, with nonlinear and non-stationary characteristics. When external forces are applied to the structure, vibrations of different frequencies and magnitudes are excited. If any of the vibrations cannot be damped within a reasonable period of time, damage to the structure is inevitable. The damage woul...

2014
Mojtaba Jafari Tadi Tero Koivisto Mikko Pänkäälä Ari Paasio

Both respiratory and cardiac motions reduce the quality and consistency of medical imaging specifically in nuclear medicine imaging. Motion artifacts can be eliminated by gating the image acquisition based on the respiratory phase and cardiac contractions throughout the medical imaging procedure. Electrocardiography (ECG), 3-axis accelerometer, and respiration belt data were processed and analy...

2010
Mark A. Zurcher Maroun Semaan Cliff A. Megerian Wen H. Ko Darrin J. Young

An accelerometer attached to an umbo is proposed as a middle ear microphone for future fully implantable cochlear prostheses. The micromechanic characterization of cadaveric temporal bones indicates that a miniature accelerometer with a sensing resolution of 35 µg/ Hz, a bandwidth of 8 kHz, and a packaged weight less than 20 mg is required for detecting normal conversation, and that the acceler...

Journal: :Journal of rehabilitation research and development 2012
Jacob J Sosnoff Michael J Socie Morgan K Boes Brian M Sandroff Robert W Motl

Accelerometry has been recognized as a method of objectively measuring community ambulation in persons with multiple sclerosis (MS). However, the assumption that walking itself serves as a major contributor to the accelerometer signal has yet to be tested. This study examined the assumption that community-based walking is a primary contributor to accelerometer output in MS. Ambulatory persons (...

Journal: :Nutricion hospitalaria 2010
N Garatachea G Torres Luque J González Gallego

The purpose of this review is to address methodological issues related to accelerometer-based assessments of physical activity (PA) in older individuals. Special interest is also put on recently updated technology. No definitive evidence exists currently to indicate which are the more valid and reliable accelerometer models for use with older people. When it comes to selecting an accelerometer,...

Journal: :The Journal of the Acoustical Society of America 2014
Yu-An S Lien Cara E Stepp

The relative fundamental frequency (RFF) surrounding the production of a voiceless consonant has previously been estimated using unprocessed and low-pass filtered microphone signals, but it can also be estimated using a neck-placed accelerometer signal that is less affected by vocal tract formants. Determining the effects of signal type on RFF will allow for comparisons across studies and aid i...

2014
Remus C Avram Xiaodong Zhang Jacob Campbell

Unmanned Aerial Vehicles (UAVs) have attracted significant attentions in recent years due to their potentials in various military and civilian applications. Small UAVs are often equipped with low-cost and lightweight micro-electro-mechanical systems (MEMS) inertial measurement units including 3-axis gyro, accelerometer and magnetometer. The measurements provided by gyros and accelerometers ofte...

2016
Hiroshi Kobayashi Makoto Hayashi Masaru Yamaoka Takuya Yasukawa Haruna Ibi Bunnai Ogiso

Evaluating periodontal tissue condition is an important diagnostic parameter in periodontal disease. Noncontact electromagnetic vibration device (NEVD) was previously developed to monitor this condition using mechanical parameters. However, this system requires accelerometer on the target tooth. This study assessed application of laser displacement sensor (LDS) to NEVD without accelerometer usi...

2005
Xiaojing Li

Traditionally structural response due to severe conditions has been measured using accelerometers. However it is a relative acceleration measurement. The displacement from acceleration measurement cannot be obtained directly by simply applying the laws of motion through double integration. GPS-RTK offers direct displacement measurements for dynamic monitoring, but it has its own limitations. Th...

Journal: :Journal of Intelligent and Robotic Systems 2001
Grantham Pang Hugh Sing Liu

This paper gives an evaluation of a low-cost MEMS accelerometer. The accelerometer is intended for the distance measurement of a mobile robot or platform in short duration. The distance traveled is obtained by double integration of the sensor signal with time. Bias offset drift exhibited in the acceleration signal is accumulative and the accuracy of the distance measurement can deteriorate with...

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