Abstract
The display console and vehicle platform designed in this paper adopt an integrated structure design, the structure is simple and beautiful, easy to operate and easy to maintain, and the standard function module is selected as far as possible to meet the standardization requirements. Based on the design idea of generalization, serialization and combination, the display console is divided into unit design, which can be successively divided into: display unit, control unit, display and control processing unit and cabinet unit. Among them, the display unit and control unit learn from the mature design technology to ensure the design quality; The display and control processing unit is designed separately, with rigid connections to both the display unit and control unit externally, and the internal air duct is set up to meet the heat dissipation requirements. The cabinet unit is arranged under the display and control processing unit and the two are rigidly connected to ensure the overall structural rigidity and provide required installation space for user devices. The display console adopts split designs to support quick installation, disassembly and handling of four units. 3D design software is used to analyse the installation space, visual field, hand operation space, knee space and maintenance space of the display console to ensure that the display console has a good human–computer interaction function. The internal space of the display console is designed with three-dimensional wiring, the routing path of each cable in each unit is planned, and the cable can be customized in advance, which greatly improves the efficiency of on-site electrical assembly. Mechanical analysis software is used to simulate the main structure of the display console to ensure that the whole display console meets the mechanical performance requirements. The above design and analysis have certain guiding significance for similar design work of vehicle display console.
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1 Introduction
In recent years, countries all over the world attach great importance to the application of advanced technical groups with digital information technology as the core in the military field in the construction of military quality, and compete to develop high-tech weapons and equipment, and the key technology to realize this strategy is battlefield digitalization. The application of this technology in the field of armored vehicle platforms is reflected in the field of vehicle electronics. The application purpose of vehicle electronics technology is to transform the information among subsystems of combat vehicles from self-contained and disconnected to computer-based interconnection among systems in the vehicle (see [1]). In the field of armored fighting vehicles, the prerequisite for digitalization is vehicle electronics technology with digital transmission capabilities, including systems and components such as power control, communications, information/data management, computers, sensors, signal processing and fire control. With the rapid development of weapons and equipment in the world, the electronic system of combat and logistics vehicles is more and more valued by the military forces of various countries. The highly integrated and high-tech equipment and equipment forces are an inevitable trend and the electronic system of vehicles will also play an increasingly important role in the battlefield. The on-board display and control terminal, as the control centre of the vehicle, will monitor all the equipment in the vehicle in real time.
However, in different carriers, electronic equipment to withstand a variety of different degrees of vibration environment for a long time, the structure of electronic equipment will appear fatigue damage, causing its performance to decline, and even cause the damage of electronic equipment. In 1956, Lunney and Crede performed vibration analysis and fatigue analysis of electronic devices based on test data from real-world environments (see [2]). In 1973, Steinberg conducted a systematic analysis of the mechanical characteristics of electronic components from component level to system level electronic chassis in the book of vibration analysis for electronic equipment (see [3]). Finite element analysis technology was used to analyze and study the dynamic effects of surface-mount components (see [4]). Finite element analysis technique was used to study the dynamic response, dynamic strain and dynamic stress of printed boards (see [5]). Finite element analysis technology and experimental technology were used to analyze and calculate the dynamic response of printed boards under falling environment (see [6]). The research work carried out abroad mainly focuses on the object of components or printed boards, and the results obtained are also in these aspects, while the research on the system or product object is relatively rare, and the reference is limited. Domestic electronic equipment design and manufacturing managers have achieved a great development. The author systematically expounds the structural design and dynamic theory of the structure of electronic equipment, and systematically introduces the theory of vibration, shock and effective measures to reduce vibration in [7]. The author studies how to improve the anti-vibration and shock capability of electronic equipment from the perspective of the overall layout of electronic equipment and the structural design of the whole machine, and carried out optimization analysis on it in [8]. It can be seen that the domestic work on the structural dynamic response of electronic equipment is mainly focused on the system or the whole of the product, and the structural details of the components are relatively little considered, and the information available is limited.
2 Display Console Structure Scheme
Aiming at vehicle-mounted combat system and combat environment, this paper carries out research on vehicle-cabin integration, natural human–machine interaction, modeling design, human factor design, cable layout and environmental adaptability. The structure is simple and beautiful, the operation is convenient, and the maintenance is convenient. According to the installation space in the vehicle platform, the display console is adapted to change the leg part of the display console into an electronic cabinet unit, so as to provide installation space for user equipment and adopt the bottom cabinet design to improve the strength and stiffness of the overall structure of the display console. The 3D design software is used to simulate the human factor engineering of the display console. The finite element analysis software is used to simulate the mechanical test conditions of the display console. In addition, noise control and thermal design of the equipment are also carried out. In the design, we strictly follow the principles of generalization, serialization and combination design to ensure universality and extensibility.
The display console implements the design idea of generalization, serialization, modularization and combination. The display unit is composed of display unit, control unit and display control processing unit. The display unit mainly carries touch display and provides graphic image display and multi-touch function. The control unit mainly carries voice terminals, general control modules, etc., which can provide good human–computer interaction functions. The display and control processing unit carries the display and control computer and the power supply control module, and the cabinet unit mainly carries the task computer, network switch and user computer modules. In addition, the design of the display console fully considers the human factor engineering elements, adopts rounded corner design, and has no screws on the front, which can effectively improve the safety and comfort during use [9]. The layout of each unit of the display console is shown in Fig. 1.
Due to the limited space in the vehicle, in order to reduce the impact of equipment distribution on the space, the integrated design idea is adopted. The structural modeling of the display console is designed according to the space in the vehicle, and the wall-mounted installation method is adopted. The display console is connected and fixed by the bottom vibration isolator and the bottom plate of the vehicle, and the back vibration isolator and the frame beam are connected and fixed. Through the decorative parts, the display console can be integrated with the vehicle shell, the appearance is beautiful and simple, and the interior space can be maximized. The interior installation is shown in Fig. 2.
The display console carries out structural modeling design for the vehicle platform, adopts three-dimensional modeling technology to analyze the model of the vehicle display console, and focuses on the analysis of human factors including cockpit space, operator's body data measurement, field of vision, hand operation range, knee space and maintenance space. It can be seen that, this type of display console basically meets the requirements of integrated human factor engineering design. As shown in Fig. 3, the top view of the human-factor integration model shows that the spacing between the two cross-row seats is about 409 mm, which does not affect the traffic of personnel. In addition, the seat also has a folding or moving function to facilitate personnel access.
As can be seen from Fig. 4, the overall layout of the display console is reasonable, and the operation angle and hands of the personnel are accessible, which meets the requirements of human factors engineering design [10]. In addition, the operation table of the display console fully considers human factors engineering elements, adopts streamlined and rounded corners, and has high safety and comfort without screws on the front.
Figure 5 is a schematic diagram of the knee space operated by the human integrated model personnel. It can be seen that the knee height is about 725 mm, the width is about 762 mm, and the depth is about 515 mm, which meets the requirements of “the height of the knee area is not less than 640 mm, the width is not less than 510 mm, and the depth is not less than 460 mm” in the specification. In addition, the display console operating table is sprayed with skin-friendly coating, which has the effect of anti-freezing and greatly improves the comfort of operators.
3 Electrical Cable Design
3.1 Routing Design of Display and Control Processing Unit
The following mechanism is arranged at the rear of the display and control computer, and the cable is bundled and fixed through a series of holes on the part. The two ends of the wire following mechanism are connected and fixed with the backplane of the display and control computer and the wall plate of the platform through hinges. The internal cable routing method of the display and control processing unit is attached to the cable binding belt at the rear of the chassis. Figure 6 shows the cable routing method.
3.2 Routing Design of Control Unit
The module cables embedded on the control console are routed along the cable channel on the lower surface of the control mesa panel. Standard cable fixation clips are set to facilitate cable fixation. The cables extend to the rear of the display console and connect to the rear connector of the di splay and control computer. The internal wiring mode of the control unit is shown in Fig. 7.
3.3 Routing Design of Display Unit
The display cable extends downward along the cable trough and fixing device on the side wall of the display unit support, and enters the platform body through the connecting board at the rear of the display unit, and is connected with the corresponding navigation plug of the display and control computer. The back of the display unit is routed as shown in Fig. 8.
3.4 Routing Design of Cabinet Unit
Figure 9 shows the internal cabling of the cabinet unit.
4 Mechanical Design
4.1 Shock Analysis
According to the technical requirements document of the display console, the shock test conditions refer to the test grade 1 (10 g/3000 times) in GJB4.8-83 Environmental Test of Ship Electronic Equipment [11]. According to the regulations, the repetition frequency is 60–80 rpm and the shock pulse duration is ≥16 ms. In the calculation, the period duration of a single shock T is taken as 1 s, and the half-sine shock duration T are taken as 16 ms. The acceleration loading load within a single shock period is shown in Fig. 10 below, and the solution target is the stress curve at the position where the maximum stress occurs within a period.
Figure 11 shows the overall equivalent stress nephogram of the display console under the action of shock load. It can be seen that after the shock impact of the display console, the maximum stress of the overall structure is 57.62 MPa, which is far less than the allowable strength of the material, the maximum stress position is located in the lower left part of the display unit box and the control table bolt connection position, the overall structure is not in danger of damage, and the vast majority of the position stress is less than 5 MPa.
In a shock period, the stress generated by the impact attenuates well after the impact. The whole structure can meet the strength requirements under the action of shock load.
4.2 Impact Analysis
According to the technical requirements document of the display console, the impact load is applied by referring to the test impact response spectrum used in GJB150.18A-2009 military equipment laboratory environmental test method impact test [12] when no measurement data is available—ground equipment Functional test (40 g). As shown in Fig. 12, the impact time is 15–23 ms, and here it is 21 ms, and the half-sine impact load is applied.
Vertical and 30-degree oblique impact response analysis was adopted for the display console. Figure 13 is the overall equivalent stress nephogram after the display console is subjected to vertical impact, and Fig. 14 is the overall equivalent displacement nephogram after the display console is subjected to vertical impact. After the display console is impacted in the vertical direction, the maximum stress of the overall structure is 162.99 MPa, which is less than the allowable strength of the material. The maximum stress is located at the bolt connection position of the stage body and the stage body, and the overall structure does not fail to damage.
Compared with the initial position, the maximum displacement is 22.71Â mm, located on the upper panel of the lower box, within the safe displacement range.
Figure 15 is the overall equivalent stress nephogram after the display console is subjected to 30° oblique impact, and Fig. 16 is the overall equivalent displacement nephogram after the display console is subjected to 30° oblique impact. After the display console is impacted by the tilt of 30°, the maximum stress of the overall structure is 187.97 MPa, which is less than the allowable strength of the material. The maximum stress is located at the bolt connection position of the stage body and the stage body, and the overall structure does not fail to damage.
Compared with the initial position, the maximum displacement is 24.92Â mm, located on the upper panel of the lower box, within the safe displacement range.
Under the impact load, the stress produced by the impact decays well after the impact. The overall structure of the display console can meet the strength requirements under the impact load.
5 Conclusions
Based on the mature design technology of display console, make full use of 3D design software and simulation analysis software, optimize and analyze the main design parameters of display console, and the technology is reliable. The scheme meets the technical requirements of the display console, strictly follows the design principles of universality, serialization and combination, and strictly follows the design requirements of reliability, maintainability, environmental adaptability, electromagnetic compatibility and structural manufacturability. The scheme is reasonable and feasible.
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Luo, X. (2024). The Research on Structural Design of Vehicle Integrated Display and Control Console. In: Halgamuge, S.K., Zhang, H., Zhao, D., Bian, Y. (eds) The 8th International Conference on Advances in Construction Machinery and Vehicle Engineering. ICACMVE 2023. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-97-1876-4_25
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