At present, the motion capture system has two main technical routes: inertial and optical. Although the inertial type appears in the optical form, it is ultra-low cost and simple and mature processing flow, as well as a completely real-time data calculation and return mechanism. A more hot technology. At present, the most representative products in the world are the Xsens MVN inertial motion capture system developed by Xsens in the Netherlands and the 3DSuit inertial motion capture system developed by Innalabs of the United States. In the domestic, there are companies such as Nuo Yi Teng and Guo Cheng Wantong.
So how does the inertial motion capture system work correctly in virtual reality? This paper will analyze the working principle, advantages, and shortcomings of inertial motion capture, and hope to discuss it with the industry.
| Principle of inertial motion capture system
The general structure of the motion capture system is mainly divided into three parts: data acquisition equipment, data transmission equipment, and data processing unit. The inertial motion capture system applies the inertial sensor to the data acquisition end, and the data processing unit uses the principle of inertial navigation. The collected data is processed to complete the attitude angle measurement of the moving target.
How is the inertial motion capture system specifically implemented?
At the important node of the moving object, an inertial sensor device such as an integrated accelerometer, a gyroscope and a magnetometer is worn. The sensor device captures the motion data of the target object, including the posture and orientation of the body part, and transmits the data to the data transmission device. In the data processing device, after the data is corrected and processed, the three-dimensional model is finally established, and the three-dimensional model is truly and naturally moved with the moving object.
The processed dynamic capture data can be applied in animation, gait analysis, biomechanics, ergonomics and other fields.
How do accelerometers, gyroscopes and magnetometers work?
The accelerometer is used to detect the magnitude and direction of the acceleration received by the sensor. It obtains the result by measuring the force of the component in an axial direction. The expression is the axial acceleration magnitude and direction (XYZ), but used to The position of the measuring device relative to the ground is not accurate, and the defect can be compensated by the gyroscope.
The working principle of the gyroscope is to measure the angle between the vertical axis of the gyro rotor and the device in the three-dimensional coordinate system, and calculate the angular velocity, and determine the motion state of the object in three-dimensional space by the angle and the angular velocity. Its strength lies in the rotational motion of the measuring device itself, but the orientation of the device cannot be determined. And just the magnetometer can make up for this defect, its strength lies in the orientation of the positioning device, which can measure the angle between the current equipment and the four directions of the southeast and the northwest.
In motion capture systems, gyro sensors are used to process rotational motion, accelerometers are used to process linear motion, and magnetometers are used to process directions. Speak easy-to-understand -
The gyroscope knows "we have turned around", the accelerometer knows "how long we exercise," and the magnetometer knows "our direction of motion."
In the motion capture system, three sensors make full use of their respective characteristics to track the motion of the target object.
At present, the most representative products in the world are the Xsens MVN inertial motion capture system developed by Xsens in the Netherlands and the 3DSuit inertial motion capture system developed by Innalabs. The MVN is a full-body Lycra set (also with straps) that is easy to use and allows the user to set up the entire system in 15 minutes. It features a miniature inertial sensor, biomechanical model, and sensor fusion algorithm with 17 inertial trackers that track body movements in 6 degrees of freedom. Xsens MVN has fast turnaround times and data transmission is stable and error-free, saving up to 80% post-processing time.
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The gear reducer is used to provide low speed and large torque.
At the same time, the gearbox with different deceleration ratio can provide different speed and torque.
Generally different industries, using different power dc motor, generally adopt custom parameter design pattern.
Method of use: the best stable in horizontal plane, installed on the 12v dc gear motor output shaft parts, cannot use a hammer to knock,knock prone to press into the 12v dc gear motor drive, may cause damage to internal components, and cannot be used in the case of blocked.
Operating temperature range:
12v Dc geared motors should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a geared motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
12v Dc geared motors should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
The longevity of 12v Dc geared motor is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
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