Research On Key Technologies For Real-time Simulation Of Important Links In The Full Life Cycle Of Special Equipment

Special equipment occupies a very important position in national defense science and technology and social production.There are many types of special equipment,including national defense equipment,engineering machinery,high-end experimental equipment,etc.,of which the structure is complex,and the product development cycle requires Serial stages of program demonstration,summary,detailed design,manufacturing,assembly and testing.However,the human-machine-environment test verification in its core link is post-mortem verification,which leads to repetitions in each link,resulting in a substantial increase in R&D costs and prolonging product launch and application cycles.Therefore,real-time simulation of the full life cycle of special equipment can help solve the problems encountered in the production,testing,putting into use and safety maintenance of special equipment.This article focuses on the simulation of some important links in the full life cycle of special equipment,and researches and realizes some of the key technologies.It mainly includes: real-time rendering and roaming of special equipment and related large-scale scenes,and special equipment movement based on rigid body dynamics,realization of physical simulation of virtual control,improvement of real-time rendering algorithm of flexible fabric for camouflage of special equipment,and exploration and realization of multi-channel human-computer interaction technology in real-time simulation of special equipment.First of all,in view of the problems of poor simulation effect of special equipment,single scene and delay of large-scale environment rendering,we explore a method for real-time simulation of a variety of special equipment and large-scale scenes.Taking a variety of special equipment and operating scenarios such as integrated real vehicles,wind turbines and molecular bearing performance test prototypes as examples,we adopt the strategy of special optimization of plane and triangular in model materials,and introduce a level of detail method,which can greatly reduce the number of models need drawing,achieve lightweighted model materials and reduce simulation time delay.Meanwhile,we use micro-surface material models and introduce optimized PBR rendering pipelines to improve the realism of material textures and reduce rendering time.Therefore,we can realize the real-time drawing and roaming of the large-scale scene of the special equipment.Secondly,for the movement and virtual control of special equipment,taking XCMG cement pump trucks,road rollers,and loaders as examples,the strategy of abstracting and simplifying the motion relationship of simulation objects is adopted,and rigid body dynamics are introduced to realize special equipment and other objects.The method of object simulation analyzes the force relationship of multiple special equipment,describes the force of each moving joint and component in the scene,optimizes and adjusts the relevant parameters of the force posture of each component,and reduces the computational complexity of physical simulation of movement and operation of special equipments,avoiding a certain degree of large deviation in the physical motion simulation and improving the accuracy of the physical simulation.Ensuring that the time dissipation in each drawing time step is within the allowable delay of the virtual control,and realizing the real-time performance of the movement and virtual control of special equipment.Thirdly,for the camouflage application of special equipment,this article simulates the camouflage flexible cloth.Equipment camouflage assessment is an important technology in the field of modern equipment.The continuous development of military camouflage is mainly due to the advancement of human science and technology.Adopting a strategy focusing on cloth model establishment and dynamic simulation,starting from the structure and movement of cloth,through the analysis of the geometric parameters and behavior parameters of cloth simulation,the method of cloth model establishment is optimized and the amount of calculation is reduced.For the dynamic rendering of heterogeneous cloth,this article classify and deal with the attributes and iteration times of different cloths in the scene,realize different material effects,and improve the reality of dynamic simulation of heterogeneous cloth.Furthermore,this article proposes a random controllable regional wind field model based on dynamics method,reduces the time delay in the simulation of the cloth tearing effect in the wind field.Then we improve the cloth tearing algorithm in the wind field,change the tear damping of the particles dynamically with the grid changes,improve the simulation effect of the cloth tearing,and realize vivid tearing effect simulation.Finally,aiming at the problem that the existing virtual training interactive mode is single and it is difficult to achieve good training results,the multi-channel human-computer interaction technology in the real-time simulation of special equipment is explored and realized.This article adopts the strategy of directional design and unified interaction design for different interaction requirements to design a complete virtual interaction framework,process and method.For scenes capable of voice interaction,we improve the sound collection and synthesis methods,optimize the work of the voice interaction terminal,reduce the sound delay of the scene,and realize the real-time virtual sound field immersive experience.For the situation where the traditional interaction in the complex working environment cannot achieve the expected effect,we design a set of gesture interaction instruction sets that can be used in a variety of virtual scenes,construct interactive content for different areas of the human body,reduce conflicts between finger interaction instructions,improve the control efficiency of gesture instructions,and achieve unified gesture interaction.For immersive interaction needs,HTC VIVE and other equipment are used to build real virtual scenes to obtain a more realistic interaction experience,thereby reducing the unexpected situations encountered by users during actual operation.For the research on interaction comfort,with the work in the practice of the verification platform of XCMG for the operational comfort of the machine,the simulation of the operating system of the large-tonnage loader and the double-drum roller was completed,which effectively controls the product development cost of the enterprise.