Thermodynamic calculation is the theoretical basis for the study of initiation and detonation, as well as the prerequisite for forecasting the detonation performance of unknown explosives. Based on the VLWR(Virial-Wu) thermodynamic code, this paper introduced the universal solid equation of state (EOS) VINET. In order to truly reflect the compressibility of nanocarbon under the extremely high-temperature and high-pressure environment in detonation, an SVM (support vector machine) was utilized to optimize the input parameters of carbon. The detonation performance of several explosives with different densities was calculated by the optimized universal EOS, and the results show that the thermodynamic code coupled with the universal solid EOS VINET can predict the detonation performance parameters of explosives well. To investigate the application of the thermodynamic code with the improved VINET EOS in the working capacity of explosives, the interrelationship between pressure P-particle velocity u and pressure P-volume V were computed for the detonation products of TNT and HMX-based PBX (HMX: binder: insensitive agent = 95:4.3:0.7) in the CJ isentropic state. A universal curve proposed by Cooper was used to compared the computed isentropic state, where the ratio of pressure to CJ state were plotted against the ratio of velocity to CJ state. The parameters of the JWL(Jones-Wilkins-Lee) EOS for detonation products were obtained by fitting the P–V curve. The cylinder tests of TNT and HMX-based PBX were numerically simulated using the LS-DYNA, it is verified that, within a certain range, the improved algorithm has superiority in describing the working capacity of explosives.

热力学计算是研究起爆和起爆的理论基础，也是预测未知炸药爆轰性能的前提。本文基于VLWR(Virial-Wu)热力学代码，介绍了通用固体状态方程(EOS) VINET。为了真实反映纳米碳在爆轰中极高温高压环境下的可压缩性，利用SVM（支持向量机）对碳的输入参数进行优化。通过优化后的通用EOS计算了几种不同密度炸药的爆轰性能，结果表明，热力学代码与通用固体EOS VINET相结合可以很好地预测炸药的爆轰性能参数。为研究改进的 VINET EOS 热力学程序在炸药工作能力中的应用，计算了 TNT 和基于 HMX 的 PBX（HMX : 粘合剂: 不敏感剂 = 95:4.3:0.7) 在 CJ 等熵状态。Cooper 提出的通用曲线用于比较计算的等熵状态，其中压力与 CJ 状态的比值与速度与 CJ 状态的比值被绘制出来。通过拟合 P-V 曲线获得爆轰产物的 JWL(Jones-Wilkins-Lee) EOS 参数。使用 LS-DYNA 对基于 TNT 和 HMX 的 PBX 的气缸测试进行了数值模拟，验证了在一定范围内，