34results about How to "Long recording time" patented technology

The invention discloses a method for obtaining shooting recording time in a launching type wind tunnel free flight test. The method includes the following step that it is assumed that the speed of a model is zero when the model arrives at the front edge of a wind tunnel observation window, and the launching initial velocity of the model is calculated through displacement and acceleration obtained from the launching position to the front edge of the wind tunnel observation window of the front edge of the model. According to the resistance coefficient of the test model, wind tunnel flow field parameters, the wind tunnel observation window size range and other parameters, the launching initial velocity, at which the longest effective shooting recording time of the test can be obtained, of the model can be estimated, and the situation that the launching initial velocity is repeatedly adjusted in a wind tunnel through a practical air blowing test to obtain the longest shooting recording time is not needed. According to the estimated launching initial velocity, the maximum angular motion cycle number of the model capable of being shot and recorded can be further estimated at the longest effective shooting recording time.

The invention discloses a recording and storing device of multichannel CAN bus data. The recording and storing device of the multichannel CAN bus data includes an FPGA controller, a DSP controller, a multichannel bus receiving and transmitting circuit, an external plug connector, a data storage circuit and a power source circuit, wherein the FPGA controller is connected with the DSP controller, the multichannel bus receiving and transmitting circuit and the data storage circuit separately; the external plug connector is connected to the multichannel bus receiving and transmitting circuit and the power source circuit separately; the power source circuit is composed of a power source switching circuit, a power failure detection circuit and a capacitive energy storage circuit. According to the recording and storing device of the multichannel CAN bus data, when the storage device is powered off, the CAN bus data can be completely recorded and reliable outage can be achieved immediately to ensure the integrity of CAN bus data records and protect a memory chip at the same time, so that the recording and storing device has the advantages of being excellent in data recording reliability, large in storage capacity, long in recording time, capable of preventing data loss during full load running and the like.

The present invention belongs to the field of speech sound storage, and provides a speech sound acquisition and storage system, which comprises a speech sound acquisition transmitter and a speech sound storage manager, wherein the speech sound acquisition transmitter is provided for acquiring daily-operating speech sound information data of an aircraft, the acquired data is transmitted to the speech sound storage manager when the amount of the acquired data achieves the predetermined data acquisition amount, the predetermined data acquisition amount is at least several ten times the amount of the data acquired by the CVR installed on the aircraft, and the speech sound storage manager is provided for receiving the data acquired by the speech sound acquisition transmitter and calling a large capacity memory card to store the received data. The speech sound acquisition and storage system has characteristics of long record time, good economy, rapid data read, and easy maintenance.