4 results about "Dynamic data" patented technology

The invention discloses an IOV (Internet of Vehicles) communication protocol design method. An information communication protocol between a vehicle terminal and a cloud terminal comprises data length, vehicle-mounted product ID, data and CRC (Cyclic Redundancy Check), wherein the data is classified into six types; a vehicle information cycle packet, a diagnosis event packet and a buffer retention packet belong to a transmission type; a vehicle information cycle acknowledgement packet, a diagnosis event request packet and a buffer retention acknowledgement packet belong to a receiving type; a data frame structure consists of solid data and dynamic data; the solid data comprises ID definitions of the six types of functional packets, time, vehicle sleep states, delayed information states, delayed meters and vehicle information update mark bits; packets which are not transmitted successfully serve as buffer detention packets. The vehicle information update mark bits are used for determining whether comparison data of the current time and previous time in vehicle information is updated or not and marking the updated data; dynamic data is vehicle information with update changes. By virtue of adopting a method of designing a solid data format and a dynamic data format and setting data mark bits, complete data can be obtained with minimal data expenses, and the IOV data transmission cost is greatly lowered.

The invention discloses a coordinate setting and online measuring method for a coordinate system in numerical control machining, which comprises the following steps of: 1, determining a machining compensation scheme of a tool coordinate axis, and determining a moving axis when a surface is machined as a compensation axis; 2, compiling a coordinate system, automatically setting a measurement program, carrying out online measurement on a zero reference of a workpiece through a numerical control machining center measuring head to obtain dynamic data, and automatically storing the dynamic data in a set # variable of a machine tool to obtain a dynamic # variable; 3, according to the machining compensation scheme in the first step and the dynamic # variable in the second step, compiling an automatic compensation numerical control machining program ; 4, after the workpiece is machined according to the automatic compensation numerical control machining program in the third step, compiling a measuring head online measuring program according to the theoretical size, and measuring the size of the machined workpiece automatically and comparing the size with the theoretical size.

The invention discloses a dynamic stability analysis iteration method and device for a high-speed railway roadbed structure. The method comprises the steps that basic format information of structural dynamic stability analysis is obtained, and a basic format is used for analyzing stability dynamic data; calculating target mechanical data of dynamic stability analysis of the high-speed railway roadbed structure according to the basic format information; performing linearization processing on the target mechanical data to obtain an analysis result; and outputting the analysis result. According to the method, traditional elastic-plastic increment analysis is avoided, and the problem that in the prior art, the high-cycle load calculation and analysis cost under the long time scale is too high is solved; stability analysis is expanded to a dynamic load functional space, and the problem that dynamic factors are difficult to consider in conventional roadbed structure stability analysis is solved; the algorithm is optimized from the angles of reduction of the number of independent variables and simplification of constraint conditions, and the problems of complex structural forms and too low solving efficiency during large-scale analysis are solved. And the applicability of the method applied to the stability analysis of the high-speed railway roadbed structure in the actual engineering level is improved.