5 results about "Acceleration amplitude" patented technology

The application discloses a kind of acceleration amplitude uniformity optimization methods for vertical vibration platform table, including steps: based on the principle of deflection distribution, define initial attachment point position;Define the working table boundary range;Simulation analysis is carried out to number module, and the distribution data of uniformity is obtained, and whether the uniformity of excellent area within boundary can be made to be larger is analyzed by comparing working boundary range;In the case where the structural stiffness is fixed, the only method to reduce the acceleration amplitude deviation between two points is to reduce the distance between two points;Repeat the above steps, so that the uniformity within working boundary reaches design target.The application aims to improve the acceleration amplitude uniformity of vibration platform extension table by increasing the number of excitation arm and table attachment points, so that the acceleration amplitude uniformity of the table is greatly improved.

This invention relates to the field of speech enhancement technology, and more particularly to a speech enhancement method and system. The invention obtains the orientation quaternion of the target device at each moment based on the rotational angular velocity of the target device at each moment and the acceleration amplitude of the original acceleration signal at each moment; based on the orientation quaternion of the target device at each moment, the coordinate system of the acceleration amplitude of the original acceleration signal at each moment is rotated to the global reference coordinate system to obtain the attitude-normalized acceleration amplitude of each moment, forming the attitude-normalized acceleration signal; a noise reduction mask and a speaker-specific mask are fused to obtain a fusion mask; based on the fusion mask and audio features, residual enhancement is performed on the spectrogram of the speech audio to be enhanced to obtain the enhanced spectrogram; based on the phase spectrum of the speech audio to be enhanced and the enhanced spectrogram, the enhanced speech audio waveform is obtained. This invention effectively improves the speech enhancement effect.

The invention belongs to the technical field of ballistic target tests, and discloses a ballistic target test model acceleration measurement data correction method. The ballistic target test model acceleration measurement data correction method comprises the following steps: carrying out a ballistic target test model acceleration measurement test; carrying out ballistic target test model acceleration measurement data integration processing; comparing the test model motion velocity peak value with the test model launching initial velocity measurement value; and correcting an acceleration measurement data error of the ballistic target test model. The method for correcting the acceleration measurement data of the ballistic target test model is suitable for extreme overload acceleration environments such as ballistic target tests and artillery tests with the acceleration amplitude being tens of thousands of gravitational accelerations and the short duration being ten milliseconds.

This invention provides a method and system for estimating the IMU mounting angle based on an exponential decay function. The method includes: establishing a gyroscope zero-bias estimation model for the vehicle and an accelerometer-gravity projection correlation model in a stationary state; calculating the effective acceleration using an exponential decay function to suppress acceleration amplitudes during cornering, performing trajectory recursion only during straight-line acceleration to obtain the horizontal displacement; calculating the heading mounting angle at each epoch using the displacement vector direction, filtering candidate heading mounting angles using consecutive adjacent angle differences, and verifying the candidate heading mounting angle results through inertial navigation recursion. This invention calculates the roll and pitch mounting angles when stationary and the heading mounting angle through acceleration during motion, achieving integrated estimation of the three mounting angles. It is suitable for initial calibration scenarios of vehicle-mounted inertial navigation, requires no external references such as GNSS or odometers, and acceleration is not limited to the stationary-to-start phase, significantly simplifying the implementation conditions for mounting angle calibration.

This invention belongs to the field of ballistic target testing technology and discloses a method for correcting acceleration measurement data of a ballistic target test model. The method includes conducting an acceleration measurement experiment on the ballistic target test model; performing integral processing of the acceleration measurement data; comparing the peak velocity of the test model with the measured initial velocity; and correcting errors in the acceleration measurement data. This method is applicable to extreme overload acceleration environments such as ballistic target tests and artillery tests, where the acceleration amplitude is tens of thousands of gravitational accelerations and the duration is on the order of tens of milliseconds.