| With unremitting growth and progress in military requirement and technology, higher requirement in the new weapon system model have been put on developing process, method and evaluation strategy et al by the modern defense industry sector. Shortening developing cycle of new product, reducing developing cost and improving performance-cost-ratio have been the prerequisites for one military enterprise to be superior than others during marker competition. To meet the new requirement of weapons' advancement, the research of evaluation technology has been developed significantly in our country to realize most accurate evaluation with optimal strategy and least cost.Reliability technology for automaton mostly stays at experimental verification stage. One can carry out the design work of automaton only according to traditional experience, similar products test data or design criteria, which lacks reliability analysis method resulting in lower levels of product reliability. Cannon with double-way feed mechanism systems, infantry fighting vehicle can quickly achieve the exchange of different kinds of ammunition according to different operational objectives, thus can avoid service chaos operation to achieve point face destruction and to improve the operational effectiveness. However, fault of the feed mechanism usually occurred due to its complex structure, particularly for feed mechanism work, it is easy to have low level radio, clamping stagnation(or bullet stuck), uneven wear or excessive, stop shooting or automata parts crack breaking etc faults, causing reliability problems particularly prominent. Great input and long cycle of the reliability testing process for the weapons systems delayed the development and shaping cycle, resulting in the test samples quantity are often relatively small, thus it is hard or substantially not reflect the actual performance of the product in respect of the reliability assessment, it can not provide a reliable basis for the product itself and the next generation realted products technical improvements. Not to mention the obvious economic benefit. Therefore, the study of related issue of the feed mechanism reliability needs a breakthrough from technology and method, and this also require to study from the design stage analysis and optimization to improve the reliability of the feed mechanism.To solve the problem of the canon automatic feed mechanism reliability is not high. In this paper, the key part for the some new minor-caliber automatic cannon has been designed to solve above problem, and kinematic characteristic and reliability of double-way feed mechanism have been analyzed. An effective approach for evaluating the key performance of the cannon is proposed as the reference and technical support for double-way feed mechanism technology.The detailed research contents of this paper are as follows:(1) Combining with the background of the subject, with the consideration of the property of double-way feed mechanism system itself, structure of each part and operating principle are determined, the relationship of each mechanism and between double-way feed mechanism system and weapon itself are also harmonized, UG, one kind of 3D modeling softwares, is adopted to build up the virtual prototype. ADAMS is then used for dynamic simulation analysis. Based on the verification of virtual prototype, test data of physical prototype are compared with simulation result or other reliable computational data, the virtual prototype is verified to be correct if the error is within allowed arrange. While analysis should be conducted for factors with large errors, the coupling between flexible deformation of some big components of feed mechanism system and mechanism is taken into account, and rigid-flexible coupling dynamic model is built. Therefore, the calculation result will be more in accordance with the real condition, and it will provide a basis for feed mechanism reliability analysis.(2) Differential equations of motion of one-order and two-order sensitivity analysis for double-way feed mechanism are derived, parameters affecting the output mostly are found. Response surface method is used to establish limit state function based on sensitivity analysis results, Monte-Carlo is adopted to analyze the sensitivity of system output relative to input variables.(3) Through analysis of the material of the feed mechanism pressure bomb cover and the performance attribute of the feed action, a method of multiple attribute decision sensitivity analysis is presented, and this method doesn't affect decision plan. When relevant attributes change, mean modification should be conducted on corresponding vectors and limit values of variation should be calculated. And then Stable and borderline range of attribute weight is obtained. Through comparison, the decision plan order of attribute sensitivity is obtained. This method will provide a idea for the multiple attribute decision optimized design.(4) Reliability model of motion analysis of feed mechanism is built, the mixed Bayes method which introduced the inherited factor is proposed. Through comparing lower confidence limit and confidence interval of mixed Bays method with the results of other classical methods, the precision of mixed Basyes is validated. Therefore, this method can effectively cut down the influence of artificial subjective factors, and it will improve the accuracy of evaluation results.(5) Bayes method is verified by conducting reliability test, properly reducing the element test number or increasing historical data groups will be helpful in shortening test cost and improving developing efficiency of products. For elements with high reliability, there's no need of many test number when conducting reliability verification by Bayes method, which can shorten test cost. It provides a new strategy for test and assessment of weapons.(6) Based on analysis results of AHP, the idea of degree of association in grey decision is utilized. On the basis of grey decision making, interval number is introduced to expand and improve the grey fuzzy multiple attribute method, the multiple attributes decision strategy according to grey correlation degree under undetermined data is proposed. Furthermore, it's introduced into performance evaluation process of different types of automatic cannon system and a further evaluation of defensibility property of cannon system with more ideal maneuverability is conducted. The evaluation results is correct and reliable, which can provide a reference value of the evaluation model and evaluation method for multiple attribute decision making about key performance of automatic canon. |
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