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Most UFO reports likely to have 'ordinary' explanations, government says, as investigation continues_我的网站

A |     10月19日消息，近日，蓝箭航天“天鹊”真空型液氧甲烷发动机（ TQ-15A）在湖州成功完成了首次全系统热试车，试验时长20秒，试验过程中发动机起动关机正常、工作平稳。据介绍，TQ-15A为目前国内推力最大的真空型液氧甲烷发动机，真空推力达836千牛，是朱雀二号火箭第二批次的二级主发动机。

B |     The Pentagon and the U.S. intelligence community believe that as better data becomes available, the "unidentified and purported anomalous nature" of most of the hundreds of UFO reports they have been investigating will likely be explained by "ordinary phenomena," according to a government review of the incidents that was released on Wednesday.The number of accounts of unidentified anomalous phenomena, or UAPs -- which is the official name now used for what were known as UFOs -- has grown to 801, with an increase of 291 additional reports from Aug. 31,2022, to April 30 of this year, according to the new government review.The total number of UAP sightings that is being examined by the Pentagon and intelligence officials stretches back decades and includes those made by both military and civilian personnel.The report released Wednesday is the first to be compiled jointly by Pentagon and the director of national intelligence's office in light of new legislation passed by Congress.The first-ever unclassified U.S. intelligence report on UAPs was released in June 2021, also due to congressional legislation, and detailed 144 incidents -- only one of which could be explained.The new report states that the Pentagon office reviewing UAP incidents, known as the All-Domain Anomaly Resolution Office, or AARO, is making progress in analyzing and integrating the hundreds of sightings it continues to receive.The report cites "gaps in domain awareness," such as a lack of information from sensor systems or other technological and mechanical issues, as the main reason for the continuing increase in the incidents being reviewed by AARO."These gaps are the direct result of insufficient data secured by radar, electro-optical (EO)/infrared (IR) sensors, the presence of sensor artifacts, such as IR flare; and optical effects such as parallax, that can cause observational misperceptions," the report states.Because the government's original UAP focus was on reports filed by military personnel, the total number of reports being investigated still tilts heavily toward those near military facilities and airspace, though that number is decreasing as more than 100 incidents from the Federal Aviation Administration are now being reviewed, according to the government report."Based on the ability to resolve cases to date, with an increase in the quality of the data secured, the unidentified and purported anomalous nature of most UAP will likely resolve to ordinary phenomena and significantly reduce the amount of UAP case submissions," the report states.

The report also plays down the potential aerial dangers that could be posed by UAPs by noting that the AARO had received no reports during the collection period that suggested that "UAP maneuvered to an unsafe proximity to civil or military aircraft, positioned themselves in flight paths, or otherwise posed a direct threat to flight safety of the observing aircraft."In an ABC News interview this past summer, Dr. Sean Kirkpatrick, the head of AARO, said that being caught off guard by "intelligent or extraterrestrial technical surprise" remained a top concern."Data and science has to guide where you go, and we will follow the data," Kirkpatrick said then.In late August, the Pentagon launched a new website to serve as a one-stop clearinghouse for unclassified information about UAPs.The platform includes unclassified videos and photos of resolved cases as well as links to reports and other resources. It will soon have a feature enabling AARO to accept reports "from current or former U.S. Government employees, service members, or contractors with direct knowledge of U.S. Government programs or activities related to UAP dating back to 1945."In June, the Pentagon issued a statement that "to date, AARO has not discovered any verifiable information to substantiate claims that any programs regarding the possession or reverse-engineering of extraterrestrial materials have existed in the past or exist currently."The was issued in response to unconfirmed claims by David Grusch, a former intelligence official who said he was stepping forward as a whistleblower to say that the U.S. had been collecting non-human craft for "decades."In late July, a House Government Oversight subcommittee held a hearing where Grusch went public with his allegations and urged Congress to investigate.。与现有80吨+10吨的二级发动机布局方案相比，取消了游动发动机TQ-11，主发动机由不摇摆改为泵前摆，降低了二级发动机系统复杂度，总重量减轻约400千克，推力室进一步增大喷管面积比，并将涡轮排气引入推力室大喷管进行冷却，解决了涡轮排气引起的干扰力问题。TQ-15A发动机真空推力提高9%、真空比冲提高130米/秒，推力调节范围拓宽至55%~110%且具备三次起动能力，可大幅提升火箭发射任务的适应性。本台TQ-15A发动机为带伺服机构不带大喷管状态，本次试车重点考核发动机系统、总装和各组合件改进方案的可行性，验证起动关机时序的正确性，获得发动机的实测性能数据及工作特性，发动机按预定程序起动和关机、工作平稳，达到了预期设计目标。本轮试车计划开展5次试车（含两次多次起动）、累计试车时间970秒，首次试车结束后将继续考核发动机长程工作可靠性、大范围推力调节时的工作适应性、发动机与伺服系统的工作协调性，多次起动、高低入口压力及过冷推进剂等各种条件下的发动机的工作适应性，全面验证发动机设计方案，并获得大喷管条件下发动机的性能数据。朱雀二号运载火箭自2017年9月立项至今，已完成了第一批次火箭技术状态的研发工作。目前，朱雀二号Y1火箭已出厂并完成低温加注合练，Y2火箭的总装工作正在嘉兴蓝箭航天中心进行。在此基础上，公司研发团队对第二批次火箭进行了研制迭代和优化改进，使之具备更优的性能和更高的可靠性。

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